IAP需要有两个工程，第一个是Bootloader，第二个是Application

同时将这两份程序放在mcu的flash里的不同位置，启动时自动进入bootloader（可选择）进行iap，成功后跳转至application。

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完整源码见最后内容，这里先瞎扯一点点：

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那么IAP问题简化成三个步骤，

Step1:做Bootloader工程

Step2:做Application工程

Step3:烧进Flash的不同位置

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Step1:需要做这些事情：

1：初始化IAP相关外设

2：下载文件（ymodem协议）

3: 写入Application程序存储空间

鸡：

     IAP_Init();

     SerialDownload();

具体实现：

1. /**
   
2.   *@brief  Initialize the Iap module(leddelay usart and unlock flash)
   
3.   *@param  None
   & ?( Q- L# _; \( H1 [
4.   *@retval None
   2 j9 \5 F2 Q2 ?* K# u
5.   */  
   
6. void IAP_Init(void)  
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7. {  
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8.   uint32_tt;  
   
9. LEDInit();                  /*--Set up Led to Output signal  --*/  
   
10. SysTickInit();                 /*-- Config System Tick for delay functions --*/  
    
11. USART_Configuration();            /*-- Config usart to download .bin --*/  
    
12. FLASH_If_Init();                     /*-- Unlock Flash --*/  
    
13. for(t = 2000; t > 10; t >>= 1 )        /*-- LED1 blink 3 second indeicate IAPbegin--*/  
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14.   {  
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15.    LEDTogle(1); delayms(t);  
    
16.   }  
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17. }  
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18.    
    
19.    
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20. void SerialDownload(void)  
    
21. {  
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22. uint8_t Number[10] = {0};  
    
23. int32_t Size = 0;  
    
24.    
      h4 J: b( ]6 w: E. Z
25.   SerialPutString("Waitingfor the file to be sent ... (press 'a' to abort)\n\r");  
    
26. Size = Ymodem_Receive(&tab_1024[0]);  
    
27.   if(Size > 0)  
    : }2 O: f1 [$ D" B3 |* ]7 [
28.   {  
    
29.    SerialPutString("\n\n\r Programming CompletedSuccessfully!\n\r--------------------------------\r\n Name: ");  
    
30.    SerialPutString(FileName);  
    
31.    Int2Str(Number, Size);  
    
32.    SerialPutString("\n\r Size: ");  
    
33.    SerialPutString(Number);  
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34.    SerialPutString(" Bytes\r\n");  
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35.    SerialPutString("-------------------\n");  
    
36.   }  
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37. else if (Size == -1)  
    
38.   {  
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39.    SerialPutString("\n\n\rThe image size is higher than the allowedspace memory!\n\r");  
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40.   }  
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41. else if (Size == -2)  
    
42.   {  
    
43.    SerialPutString("\n\n\rVerification failed!\n\r");  
    
44.   }  
    
45. else if (Size == -3)  
    
46.   {  
    
47.    SerialPutString("\r\n\nAborted by user.\n\r");  
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48.   }  
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49. else  
    
50.   {  
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51.     SerialPutString("\n\rFailedto receive the file!\n\r");  
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52.   }  
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53. }  

复制代码

Step2:需要这样干：

在Application工程中程序运行的一开始加上如下中断拷贝即可

1. void InterruptRemap(void)  
   
2. {  
   
3.        u8 i;  
   
4.        u32 Data;  
   
5.        u32 Address;  
   
6.        for(i=1;i<48;i++)  
   
7.        {  
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8.                Data =  *(__IOu32*)(0x08003000+i*4);  
   
9.                Address = 0x20000000 + (i*4);  
   
10.                 *(__IO u32*)Address= (u32)Data;  
    
11.        }  
    
12.        SYSCFG_MemoryRemapConfig(SYSCFG_MemoryRemap_SRAM);  
    7 Z; d: K7 o. A- a
13. }  

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Step3:这就样

将两个工程分别烧在不同的flash地址段中

A:bootloader

1:点Project选项卡，然后点Optionsfor Target选项如图：

2：Target选项卡下有on-chip地址设置，bootloader放在0x8000000开头的0x3000空间内

如图：

然后正常手段烧入flash即可。

B:application

和上述设置手段一样，只不过in-chip的IROM1设置起始地址为0x8003000，Size为mcu的Flash大小减去0x3000即可（注意是16进制哦）

然后就祝你幸福了   0.0

完整源码：

Main.c

1. /* Includes------------------------------------------------------------------*/  
   
2. #include "stm32f0xx.h"  
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3. #include "flash.h"  
   
4. #include "powerAPI.h"  
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5. #include "IAP_Bootloader.h"  
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6.    
   
7.    
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8. /**
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9.   *@brief  Main program.
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10.   *@param  None
    
11.   *@retval None
    
12.   */  
    
13. int main(void)  
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14. {  
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15. SystemPowerUp();               /*-- PowerUp && LoadSysMsg --*/  
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16. while (1)  
    
17.   {  
    
18.    if(FLASH_If_ReadWord((uint32_t)IAP_READY_FLAG_ADDRESS) == FLAG_READY)  
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19.     {  
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20.      IAP_Init();  
    
21.      SerialDownload();  
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22.      IAP_End_Clear_Flag();  
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23.     }  
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24.    else  
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25.     {  
    
26.      JumpToApp();  
    
27.     }  
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28.   }  
    
29. return 0;  
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30. }  

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1. /**
   
2. ******************************************************************************
   
3.   *@file      bootloader.c
   
4.   *@brief     IAP module function
   
5.   *@CPU       STM32F051
   
6.   *@compiler  Keil uVision V4.74
   6 K# \1 Z* {8 l6 `
7.   *@author    MetalSeed
   
8.   *@version   V1.0.0
   
9.   *@date      18-Sept-2014
   
10.   *@modifydate20-Sept-2014
    
11. ******************************************************************************
    
12.   *@attention
    
13.   */  
    # Y/ i& \4 h4 J3 h1 r
14. #include "stm32f0xx.h"   
    
15. #include "IAP_Bootloader.h"  
    
16. #include "uart.h"  
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17. #include "led.h"  
    
18. #include "delay.h"  
    
19. #include "flash.h"  
    
20. #include "ymodem.h"  
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21.    
    
22. /*================================================================
    
23.         APPLICATION_ADDRESS   =   (uint32_t)0x08003000
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24.                         defined in flash
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25. ================================================================*/  
    
26.    
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27. extern uint32_t IapReady;  
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28. uint8_t tab_1024[1024] ={ 0 };  
    
29. uint8_t FileName[FILE_NAME_LENGTH];  
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30.    
    
31.    
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32.    
    # b- u* y+ f6 I5 B' v1 N
33.    
    
34. /*================================================================
    
35.                             About Jump              
    
36. ================================================================*/  
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37. typedef void (*pFunction)(void); /*-- define a function type --*/  
    
38.    
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39. uint32_t JumpAddress; /*-- define the usrapp's address --*/  
    % f3 S6 q5 e! c
40.    
    
41. pFunction JumpToApplication; /*-- definethe function pointer which direct to usr app --*/  
    
42.    
    
43.    
    6 w( |1 _6 n/ V4 S4 D" U4 F
44. /**
    # [; w" ~. d+ H  E% @8 M$ I: B/ W
45.   *@brief  Jump to application
    
46.   *@retval None
    # t+ c" F9 U( ]- A/ U
47.   */  
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48. void JumpToApp(void)  
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49. {  
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50.    if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0x2FFE0000 ) ==0x20000000)/*-- check whether stack pointer legal --*/  
    
51.     {  
    
52.       
    
53.      JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);  
    
54.      JumpToApplication = (pFunction) JumpAddress;  
    
55.       
    
56.      __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS); /*-- initialize theheap & stack pointer --*/  
    
57.    
    
58.      JumpToApplication();  
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59.     }  
    # ?$ a" Z$ B2 |( \" W8 g
60. }  
    
61.    
    
62.    
    
63.    
    
64.    
    4 @( ^/ @+ n; I0 r
65. /*================================================================
    
66.                     About IAP Download
    5 e0 n% z" @5 v: q. u
67. ================================================================*/  
    
68. /**
    
69.   *@brief  Initialize the Iap module(leddelay usart and unlock flash)
    
70.   *@param  None
    
71.   *@retval None
    0 n4 _9 i" L! k6 A- Y: {
72.   */  
    8 X. _$ R" G1 [( B5 [  Y
73. void IAP_Init(void)  
    
74. {  
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75. uint32_t t;  
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76. LEDInit();                  /*--Set up Led to Output signal  --*/  
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77. SysTickInit();                 /*-- Config System Tick for delay functions --*/  
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78. USART_Configuration();             /*-- Config usart to download .bin --*/  
    
79. FLASH_If_Init();                     /*-- Unlock Flash --*/  
    
80. for(t = 2000; t > 10; t >>= 1 )        /*-- LED1 blink 3 second indeicate IAPbegin--*/  
    . V2 Q4 r% U9 K5 L7 d
81.   {  
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82.    LEDTogle(1); delayms(t);  
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83.   }  
    
84. }  
    
85.    
    
86.    
    
87. /**
    . ~4 {4 H6 @* |* v+ P; }
88.   *@brief  IAP end, Clear Iap ready flag andoutput success signal
    
89.   *@retval None
    
90.   */  
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91. void IAP_End_Clear_Flag()  
    
92. {  
    
93. uint32_t i;  
    ) _, o, A, Y  \) i' E
94. if(FLASH_If_WriteWord(IAP_READY_FLAG_ADDRESS, FLAG_UNREADY)  == 0)/*-- clear iap ready flag --*/  
    
95.   {  
    
96.    for(i = 0; i < 50; ++i) /*-- IAP end, Led1 and Led2 blink in turnlast 2.5 second --*/  
    
97.     {  
    
98.      LEDTogle(1); delayms(50); LEDTogle(2);  
    
99.     }  
    
100.   }  
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101. LED1ON;                  /*-- IAPend, Led1 and Led2 turn ON last 3 second --*/  
     
102. LED2ON;  
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103. delayms(3000);  
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104. }  
     
105.    
     
106.    
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107. /**
     % ?4 C- e& A1 v4 `7 ^
108.   *@brief  In App Program by Serial
       k+ |6 e1 D2 s: u6 J, X; e) s) k
109.   *@retval None
       a" P+ b- b3 Y* g6 }$ o$ x
110.   */  
     
111. void SerialDownload(void)  
     
112. {  
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113. uint8_t Number[10] = {0};  
     
114. int32_t Size = 0;  
     . a' p/ n* U( |. D& [
115.    
     
116. SerialPutString("Waiting for the file to be sent ... (press 'a' toabort)\n\r");  
     
117. Size = Ymodem_Receive(&tab_1024[0]);  
     * C4 h7 ?/ x$ X$ X$ M/ D
118.   if(Size > 0)  
     
119.   {  
     
120.    SerialPutString("\n\n\r Programming CompletedSuccessfully!\n\r--------------------------------\r\n Name: ");  
     " a; `+ O! C* n: B6 i: S
121.    SerialPutString(FileName);  
     
122.    Int2Str(Number, Size);  
     
123.    SerialPutString("\n\r Size: ");  
     
124.    SerialPutString(Number);  
     
125.    SerialPutString(" Bytes\r\n");  
     
126.    SerialPutString("-------------------\n");  
       e/ X; v7 E: x& d4 m/ Q  y
127.   }  
     
128. else if (Size == -1)  
     
129.   {  
     0 k4 Q' r! ?0 s# n) |
130.    SerialPutString("\n\n\rThe image size is higher than the allowedspace memory!\n\r");  
     
131.   }  
     
132. else if (Size == -2)  
     
133.   {  
     5 g. a' n" O% ]. j6 q& @* W# ?
134.    SerialPutString("\n\n\rVerification failed!\n\r");  
     : [$ |7 J' t/ {
135.   }  
     : u) `. E4 M8 @* H( ~8 j
136. else if (Size == -3)  
       {9 l! T+ S$ M1 M0 h6 ^  d& F
137.   {  
     
138.    SerialPutString("\r\n\nAborted by user.\n\r");  
     
139.   }  
     7 E+ L! n" ~. v1 \
140. else  
     
141.   {  
     
142.    SerialPutString("\n\rFailed to receive the file!\n\r");  
     / A" `' o6 K# o# v. [
143.   }  
     
144. }  
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145.    
     
146.    
     
147. /**
     % M4 t1 ]9 _; i- s5 E4 B5 V
148.   *@brief  Upload a file via serial port.
     
149.   *@param  None
     
150.   *@retval None
     
151.   */  
     
152. void SerialUpload(void)  
     
153. {  
     
154. uint8_t status = 0 ;  
     ( ~; B$ U3 ]8 ?! M7 V% k4 z
155.    
     
156. SerialPutString("\n\n\rSelect Receive File\n\r");  
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157.    
     ) p! c1 d" r! k" w$ }) T6 p
158.   if(GetKey() == CRC16)  
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159.   {  
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160.    /* Transmit the flash image through ymodem protocol */  
     6 ~/ T) m0 K0 i0 l: l5 Q
161.    status = Ymodem_Transmit((uint8_t*)APPLICATION_ADDRESS, (constuint8_t*)"UploadedFlashImage.bin", USER_FLASH_SIZE);  
     
162.    
     
163.    if (status != 0)  
     ! L* l9 [$ ?9 Q5 M/ q+ R
164.     {  
     
165.      SerialPutString("\n\rError Occurred while TransmittingFile\n\r");  
     . z: Y8 z2 _! |5 b5 a
166.     }  
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167.    else  
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168.     {  
     1 F( @9 G* ~+ ?" A
169.      SerialPutString("\n\rFile uploaded successfully \n\r");  
     
170.     }  
     
171.   }  
     " i/ E& S" ^0 G+ K+ O$ v  p2 f, }
172. }

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1. FLASH.c  
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2. /**
   ' C6 W) F$ [' W+ h$ w# A. O
3. ******************************************************************************
   
4.   *@file      flash.c
   9 m  t3 _( {$ H$ j& ?% N
5.   *@brief     XXX function
     o+ t, C$ G& j
6.   *@CPU       STM32F051
   
7.   *@compiler  Keil uVision V4.74
   3 K+ n2 z- @$ {" e1 y" ]
8.   *@author    MetalSeed
   
9.   *@version    V1.0.0
   
10.   *@date      18-Sept-2014
    
11.   *@modifydate20-Sept-2014
    
12. ******************************************************************************
    
13.   *@attention
    
14.   */  
    
15.    
    
16. /* Includes ------------------------------------------------------------------*/  
    8 _/ S, m) M; q& j1 ^3 P9 \/ g( q$ t
17.    
    
18. #include "stm32f0xx.h"  
    . l' S* Z" p( C4 ^
19. #include "flash.h"  
    
20. #include "uart.h"  
    # A5 `* u( d: s* A: X% k  l
21.    
    / ^, Q6 [) M; ^- n" U
22. /** @addtogroup STM32F0xx_IAP
    0 U% C! W! F- o- x7 D
23.   *@{
    ) D, K9 I% ]7 G
24.   */  
    8 ^; J, k8 @# W  j& C# u" r! m
25.    
    
26. /**
    
27.   *@brief  Unlocks Flash for write access
    ) v: C3 F+ A' I/ I
28.   *@param  None
    - \, l* J2 m4 k7 F: A' e5 U( T
29.   *@retval None
    # J, b, C* r& Z* y5 ^2 r
30.   */  
    
31. void FLASH_If_Init(void)  
    
32. {  
    / J7 x3 M" B( z' E0 [
33.   /*Unlock the Program memory */  
    
34. FLASH_Unlock();  
    
35.    
    
36.   /*Clear all FLASH flags */   
    $ j+ n2 _) I- Y; I
37. FLASH_ClearFlag(FLASH_FLAG_EOP|FLASH_FLAG_WRPERR | FLASH_FLAG_PGERR |FLASH_FLAG_BSY);   
    % Z  l( ]4 R. r  X
38. }  
    " `) z: p# E& T2 b- P
39.    
    
40. /**
    - u+ N0 w( L2 S+ R
41.   *@brief  This function does an erase of alluser flash area
    , M' |( A/ k9 I( s  i" v
42.   *@param  StartSector: start of user flasharea
    , `: O' X2 {& {$ ]6 [
43.   *@retval 0: user flash area successfully erased
    7 J) b% ?: ~  m) F; V9 z
44. *         1: error occurred
    % M# h' E. @& I3 r: Z
45.   */  
    % F: b% Q4 i5 L, G4 u8 H, V
46. uint32_t FLASH_If_Erase(uint32_tStartSector)  
    
47. {  
    # {% H# l/ J# g, u. a, l
48. uint32_t flashaddress;  
      f! G' D0 d) G3 `
49.    
    
50. flashaddress = StartSector;  
    
51.    
    
52. while (flashaddress <= (uint32_t) USER_FLASH_LAST_PAGE_ADDRESS)  
    
53.   {  
    
54.    if (FLASH_ErasePage(flashaddress) == FLASH_COMPLETE)  
    3 N' U' h: i, K) s0 l4 k" [
55.     {  
    " W. j$ Q* }. R/ _9 G
56.      flashaddress += FLASH_PAGE_SIZE;  
    
57.     }  
    
58.    else  
    ( p( C0 [+ q9 J3 _4 x
59.     {  
    - k) d7 A; O2 T5 E: `% `& H) s4 f
60.      /* Error occurred while page erase */  
    2 }5 ^' h  ?+ A1 H- M" f
61.      return (1);  
    
62.     }  
    & J5 H. b$ ]# V% y
63.   }  
    
64. return (0);  
    0 m. S4 w. Y/ Z+ s: ]* r! h/ W; ~0 h
65. }  
    
66.    
    ' E. z% e7 r8 x2 a( @6 L
67. /**
    
68.   *@brief  Read uint32_t int
    
69.   *@param  FlashAddress: address to be read
    & b: A4 A1 _8 Y+ {& s/ Q% b" I
70.   *@retval Read value  
    
71.   */  
    - a! h' `3 m: ]  x
72. uint32_t FLASH_If_ReadWord(__IO uint32_tFlashAddress)  
    
73. {  
    
74. return *(uint32_t*)FlashAddress;  
    8 y. d- s- F2 O$ b
75. }  
    
76.    
    
77. /**
    
78.   *@brief  Erase flash by one page
    
79.   *@param  SectorNum: page number
    
80.   *@retval None
    3 b7 }' t& j, D& Q5 @
81.   */  
    2 X. q) [' t; {$ v' @% B9 i6 b: n
82. uint32_t FLASH_If_ErasePage(uint32_tSectorNum)  
    2 G" Q6 b0 h( q
83. {  
    
84. uint32_t flashaddress;  
    
85.    
    
86. flashaddress = SectorNum;  
    / h0 G2 y1 k) k5 s
87.   if(FLASH_ErasePage(flashaddress) == FLASH_COMPLETE)  
    . Z- s3 k% U; {, Z, B- E
88.   {  
      `7 W3 f; J. E
89.    return 0;  
    6 W7 g/ U# a0 ]
90.   }  
    ! z$ [$ r" x. E% Z. m
91. else  
    ; j2 ^7 L' @3 _1 n) N% v
92.   {  
    
93.    /* Error occurred while page erase */  
    
94.    return (1);  
    ' y( _4 J+ l2 o/ j/ u
95.   }  
    & W' y7 h% X$ J; T0 B
96. }  
    
97.    
    - \, E. h( s6 c2 C! P
98. /**
    
99.   *@brief  Write uint32_t int
    
100.   *@param  FlashAddress: address to write
     
101.   *@param  Data: data to be write
     
102.   *@retval 0: Write success  
     
103.   *@retval 1: Write error  
     ) |& o: h; `' w8 [1 y! z  P
104.   *@retval 2: read error  
     
105.   */  
     
106. uint32_t FLASH_If_WriteWord(uint32_tFlashAddress, uint32_t Data)  
     
107. {  
     
108.   if(FLASH_ProgramWord(FlashAddress, Data) == FLASH_COMPLETE)  
     
109.   {  
     . u. P$ [: `, x# L0 {  p
110.    /*Check the written value */  
     ) ^: ]6 Y9 T! S1 ~  c
111.    if (*(uint32_t*)FlashAddress != Data)  
     
112.     {  
     
113.      /* Flash content doesn't match SRAM content */  
     
114.      return(2);  
     8 c) b: F8 r- r9 t5 x- \4 N# @- w! i
115.     }  
     
116.    return 0;  
     
117.   }  
     
118. else  
     $ U' @8 o: R2 A5 c0 V6 J+ ^# v
119.   {  
     
120.    /* Error occurred while writing data in Flash memory */  
     
121.    return (1);  
     
122.   }  
     ) o: e6 t  u! O& n
123. }  
     
124.    
     # H7 _7 }6 M0 F+ k
125.    
     
126. /**
       }* ^3 A2 {! w5 ?2 k0 D
127.   *@brief  This function writes a databuffer in flash (data are 32-bit aligned).
     
128.   *@note   After writing data buffer, theflash content is checked.
     
129.   *@param  FlashAddress: start address forwriting data buffer
     
130.   *@param  Data: pointer on data buffer
     5 |  [, o" ~" r( W! b, s
131.   *@param  DataLength: length of data buffer(unit is 32-bit word)   
     
132.   *@retval 0: Data successfully written to Flash memory
     
133. *         1: Error occurred whilewriting data in Flash memory
     
134. *         2: Written Data in flashmemory is different from expected one
     
135.   */  
     
136.    
     7 n3 _9 }, m! S  ^4 c5 B
137. uint32_t FLASH_If_Write(__IO uint32_t*FlashAddress, uint32_t* Data ,uint16_t DataLength)  //ÐèÒª½«Á½¸öµØÖ·¸³Öµ¹ýÀ´¡£°´Êý¾Ý³¤¶È½«Êý¾ÝдÈëflash  
     
138. {  
     ) Z8 X+ T, ~/ ~. v
139. uint32_t i = 0;  
     
140.   for(i = 0; (i < DataLength) && (*FlashAddress <=(USER_FLASH_END_ADDRESS-4)); i++)  
     
141.   {  
     ( \$ c& ~+ ]9 c- G8 o
142.    /* the operation will be done by word */  
     
143.    if (FLASH_ProgramWord(*FlashAddress, *(uint32_t*)(Data+i)) ==FLASH_COMPLETE)  
     
144.     {  
     ( c. G9 F9 }& a' Z8 J6 I! w4 I, c
145.     /* Check the written value */  
     
146.      if (*(uint32_t*)*FlashAddress != *(uint32_t*)(Data+i))  
     
147.      {  
     
148.        /* Flash content doesn't match SRAM content */  
     
149.        return(2);  
     * ?7 N2 c3 Z; e( `0 f
150.      }  
     
151.      /* Increment FLASH destination address */  
     ( a4 d* v' H$ n, D7 L1 j; u' J
152.      *FlashAddress += 4;  
     
153.     }  
     $ g# P/ l# N2 t( O/ W/ M3 u% @
154.    else  
     
155.     {  
     
156.      /* Error occurred while writing data in Flash memory */  
     + ~$ E7 ]2 Q( ]& \% l( A' M
157.      return (1);  
     
158.     }  
     
159.   }  
     : g9 _- i/ [$ Y& [. [8 P0 H9 ~
160.    
     
161. return (0);  
     
162. }  
     
163. /**
     
164.   *@brief  Disables the write protection ofuser desired pages
     
165.   *@param  None
     
166.   *@retval 0: Write Protection successfully disabled
     0 m+ s. M* ?+ }- m
167. *         1: Error: Flash writeunprotection failed
     
168. *         2: Flash memory is not writeprotected
     ( I- d4 U7 d9 S7 W  Q( {
169.   */  
     
170. uint32_tFLASH_If_DisableWriteProtection(void)  
     
171. {  
     
172. uint32_t UserMemoryMask = 0, WRPR = 0;  
     
173. FLASH_Status status = FLASH_BUSY;  
     ' L% b0 d& x- I* [* [. N* @
174.    
     ) g4 _) P7 N! z' K4 A3 \
175.   /*Clear all FLASH flags */   
     ! g) G, T8 r4 F4 s3 a
176. FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGERR |FLASH_FLAG_BSY);  
     
177.    
     - ?* |( H# m: O! g; f* W% r
178.   /*Get Write protection */  
     : R( x7 v* H! s# E! y
179. WRPR = FLASH_OB_GetWRP();  
     7 N8 K9 {# Z8 W' m
180.    
     
181.   /*Test if user memory is write protected */  
     / J0 D" ]' C! \. j- u7 l; N# |
182.   if(FLASH_If_GetWriteProtectionStatus() != 0x00)  
     
183.   {  
     
184.     /* Enable the FLASH option byte access */  
     3 j; k, s/ I1 _1 ^( U3 K
185.    FLASH_OB_Unlock();   
     
186.    
     
187.    /* Erase option bytes */  
     
188.    status = FLASH_OB_Erase();  
     - i& T" v: Z$ f$ X5 K% M5 A
189.    
     0 c( d5 l+ v) k; H
190.    /* Compute the User_Mask */  
     
191.    UserMemoryMask = FLASH_PROTECTED_PAGES | WRPR;  
     : k! c- ^% o0 S# G
192.      
     
193.    if (UserMemoryMask != 0xFFFFFFFF)  
     
194.     {  
     1 m& v+ m. F3 i  x1 P$ o
195.    /* Disable Write protection */  
     9 \* @& B( a8 a# _
196.    status = FLASH_OB_EnableWRP((uint32_t)~UserMemoryMask);  
     9 J8 M5 [/ G" |
197.     }  
     
198.      
     
199.    if (status == FLASH_COMPLETE)  
     0 \4 U+ b/ N8 w2 ]6 B: O
200.     {  
     & U  N; T+ d% |: l1 F. P) f+ Q8 H$ ?
201.      /* Write Protection successfully disabled */  
     
202.      return (0);  
     . z7 f4 U! E) o
203.     }  
     1 Q8 z( Z* e  [& c6 a
204.    else  
       \7 |8 d/ T) W7 W$ t
205.     {  
     
206.      /* Error: Flash write unprotection failed */  
     
207.      return (1);  
     
208.     }  
     
209.   }  
     
210. else  
     $ A- n; M: R3 ]% ~
211.   {  
     ; b$ y1 _7 V6 v( B) ]* i
212.     /* Flash memory is not write protected */  
     
213.     return(2);  
     
214.   }  
     
215. }  
     ' Y5 d: \* O- n! d1 z' W9 ~
216.    
     - g" Y$ W: [& }+ V8 F1 j% ~
217. /**
     ! q; L- b, _8 j0 A& o% k
218.   *@brief  Returns the write protectionstatus of user flash area.
     1 m5 H% x: V/ Q% r
219.   *@param  None
     
220.   *@retval If the sector is write-protected, the corresponding bit in returned
     
221. *         value is set.
     " i9 i! t  g+ G9 [# i9 V
222. *         If the sector isn'twrite-protected, the corresponding bit in returned
     4 l$ f$ F2 k' V9 G6 R
223. *         value is reset.
     . {3 i' @/ d; b* a
224.   */  
     
225. uint32_t FLASH_If_GetWriteProtectionStatus(void)  
     
226. {  
     # i: Y: d0 O+ u! N$ @: \
227. return(~FLASH_OB_GetWRP() & FLASH_PROTECTED_PAGES);  
     7 g' p6 g6 r' L6 o8 {, H, Q
228. }  
     ; p; M( k* W- P4 D
229.    
     
230.    
     8 N9 u' Z8 @, e% M" {* _5 `. N
231. /**
     
232.   *@}
     
233.   */  
     * v7 Z. ]. A/ `" k
234.    
     
235.    
     
236. /************************ (C) COPYRIGHTSTMicroelectronics *****END OF FILE****/

复制代码

/ u; C" ]5 x' t

Ymodem.c

1. /**
   " P. k9 h/ w* c+ P+ y, h2 x5 |9 ]
2. ******************************************************************************
   6 Q3 e2 b( N( E/ H
3.   *@file    STM32F0xx_IAP/src/ymodem.c
   $ j/ `$ r6 J3 x2 t
4.   *@author  MCD Application Team
   
5.   *@version V1.0.0
   
6.   *@date    29-May-2012
   8 B- o/ K/ G3 A
7.   *@brief   Main program body
   2 x5 H3 |! j5 l
8. ******************************************************************************
   
9.   *@attention
   
10.   *
    
11.   *<h2><center>© COPYRIGHT 2012STMicroelectronics</center></h2>
    
12.   *
    & X8 `7 n7 P4 @, g* f0 J5 w
13.   *Licensed under MCD-ST Liberty SW License Agreement V2, (the"License");
    + s+ ]" @" |. m
14.   *You may not use this file except in compliance with the License.
    # a0 z7 j+ |  p0 Z$ D
15.   *You may obtain a copy of the License at:
    , Y6 _& I' c7 f: c) k* q$ R
16.   *
    
17. *       http://www.st.com/software_license_agreement_liberty_v2
    
18.   *
    2 U2 M! X! M+ T5 L
19.   *Unless required by applicable law or agreed to in writing, software
    ( N0 _9 N0 }6 L( Y. l
20.   *distributed under the License is distributed on an "AS IS" BASIS,
    
21.   *WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    
22.   *See the License for the specific language governing permissions and
    
23.   *limitations under the License.
    ) j& f6 r; \3 |' `
24.   *
    
25. ******************************************************************************
    7 K; L" k0 d  u7 i
26.   */  
    
27. /* Includes------------------------------------------------------------------*/  
    + w& |( B/ R+ V  l
28.    
    ' T/ C4 \% E6 K
29. #include "ymodem.h"  
    ' ^( I( M0 V) n2 A3 R. E
30. #include "uart.h"  
    ; i9 s. p4 e; H' L
31. #include "string.h"  
    
32. #include "flash.h"  
    ) T# h! Z8 ^( B. O" v  y
33.    
    ! z% e( b( R. O# n9 Z
34.    
    
35. /** @addtogroup STM32F0xx_IAP
    
36.   *@{
    / _9 p* I* M& C0 z, S
37.   */  
    
38.    
    + y/ m; ~/ G! ^: t+ e) v
39. /* Private typedef-----------------------------------------------------------*/  
    
40. /* Private define------------------------------------------------------------*/  
    # l; }8 j, G+ P& l
41. /* Private macro-------------------------------------------------------------*/  
    
42. /* Private variables---------------------------------------------------------*/  
    9 _/ d8 |8 F: |1 y5 m+ z) p; ]
43. extern uint8_t FileName[];  
    $ c" R; T0 C5 e) A4 R
44.    
    
45. /* Private function prototypes-----------------------------------------------*/  
    
46. /* Private functions---------------------------------------------------------*/  
    
47.    
    4 q5 X: U$ \8 A+ K, A5 E: S: r: K
48. /**
    
49.   *@brief  Receive byte from sender
    
50.   *@param  c: Character
    ( k/ r5 V: ?* \, m% H$ \& I; y
51.   *@param  timeout: Timeout
    ) X8 z1 j2 ~0 B4 v+ B0 ]
52.   *@retval 0: Byte received
    / K. \9 p& ]6 [
53. *         -1: Timeout
    ( C2 f7 h6 _  s" [# i$ G0 g; o
54.   */  
    
55. static int32_t Receive_Byte (uint8_t *c, uint32_t timeout)  
    2 A$ m# C& O% v, X1 d& {9 o* P
56. {  
    # E1 @, ^! K: ?6 `( p! H
57. while (timeout-- > 0)  
    
58.   {  
    ! E9 \' s- y: ]5 m' e4 t
59.    if (SerialKeyPressed(c) == 1)  
    + X0 c' \6 q% e
60.     {  
    
61.      return 0;  
    
62.     }  
    . N3 I, d) J9 P( k6 Y) x/ f
63.   }  
    $ B0 K) t: P2 o$ [  M
64. return -1;  
    - A+ w2 v: D7 ~, K
65. }  
    4 ]1 s! P4 I' |5 F, W: V& s1 Y
66.    
    / f5 I9 y8 M" m2 P2 J9 N
67. /**
    
68.   *@brief  Send a byte
    ' G4 k+ C: y0 a& w6 Q
69.   *@param  c: Character
    
70.   *@retval 0: Byte sent
    
71.   */  
    
72. static uint32_t Send_Byte (uint8_t c)  
    % o$ v0 J/ x- v
73. {  
    6 u/ r7 X+ Z3 j, b+ l8 W% a
74. SerialPutChar(c);  
    & Q* q% d6 U" X' }* e
75. return 0;  
    4 S  _( B( d* O* U; u* n( c
76. }  
    6 ?: L8 W& l. ~0 ?5 p$ E! s
77.    
    ( }& l- q* R0 T% u
78. /**
    " _/ V- H3 e2 ]: Z
79.   *@brief  Update CRC16 for input byte
    
80.   *@param  CRC input value
    
81.   *@param  input byte
    
82.   *@retval Updated CRC value
    # G# a0 [' f, }; s6 c
83.   */  
    3 _# x. Y8 ~* z9 S. y
84. uint16_t UpdateCRC16(uint16_t crcIn,uint8_t byte)  
    
85. {  
    0 D1 W, c  k. F$ F  m  @( S- F  Y
86. uint32_t crc = crcIn;  
    
87. uint32_t in = byte|0x100;  
    6 [, e8 ?% e7 `- y+ n4 A& j
88.    
    
89.   do  
    
90.   {  
    
91.    crc <<= 1;  
    
92.    in <<= 1;  
    
93.    
    
94.    if(in&0x100)  
    
95.     {  
    ; d+ B7 u  ^$ A! ]& r% g
96.       ++crc;  
    
97.     }  
    
98.      
    
99.    if(crc&0x10000)  
    6 D* x; |6 G% Z* L2 G! T$ S
100.     {  
     
101.      crc ^= 0x1021;  
     8 Y/ _3 ^% n3 |8 {" L2 E
102.     }  
     
103. }while(!(in&0x10000));  
     : ]' ?8 h" [2 W7 y- Q3 I
104.    
     
105. return (crc&0xffffu);  
     
106. }  
     ( N* W# r# Q& Q! z1 Q$ D
107.    
     9 I9 a$ Y9 V! M9 W' i
108. /**
     . o9 h' B: I8 A7 U# c9 }8 e6 T
109.   *@brief  Cal CRC16 for YModem Packet
     - c5 p. M$ Q6 U3 B2 }  Q
110.   *@param  data
     0 x' @, O2 Y3 ?* N$ J
111.   *@param  length
     + m+ I% Q7 ]; I7 R/ K
112.   *@retval CRC value
     8 E1 S% e; Q; z8 O' a' r+ R  _
113.   */  
     
114. uint16_t Cal_CRC16(const uint8_t* data,uint32_t size)  
     9 x) u& j6 L5 y, r
115. {  
     
116. uint32_t crc = 0;  
     
117. const uint8_t* dataEnd = data+size;  
     
118.    
     9 G) C$ j5 {4 j+ ?" L- J
119. while(data<dataEnd)  
     
120.   {  
     
121.    crc = UpdateCRC16(crc,*data++);  
     5 F6 z1 u8 v! d6 ^# z
122.   }  
     . y: z2 z$ z6 H8 N/ n
123.   crc= UpdateCRC16(crc,0);  
     5 Y/ @9 U' `- J) B% t' V0 d
124.   crc= UpdateCRC16(crc,0);  
     
125.    
     
126. return (crc&0xffffu);  
     8 p+ h6 K( |& L# {7 U
127. }  
     + F& s3 M9 h# b% B. m4 a) h
128.    
     , P  A' c. r, @% `
129. /**
     
130.   *@brief  Cal Check sum for YModem Packet
     ! i6 C0 U* x$ R4 R, H, P8 f9 z; _! [
131.   *@param  data
     
132.   *@param  length
     * p$ y" X# `) S. b, o  ]# W
133.   *@retval None
     3 U" W0 O, ?/ y; H
134.   */  
     
135. uint8_t CalChecksum(const uint8_t* data,uint32_t size)  
     
136. {  
     9 [# T4 H, a; e6 G
137. uint32_t sum = 0;  
     ( O: W! t1 I# R& p* T0 [1 `; z/ Q3 P3 x
138. const uint8_t* dataEnd = data+size;  
     % ~8 @3 T- z+ T% o' I
139.    
     ' K( G& _% _9 y2 A3 l" a$ G
140. while(data < dataEnd)  
     $ o$ }& D: q% V: L% Q( f
141.   {  
     
142.    sum += *data++;  
     
143.   }  
     $ W) |7 G$ G  U. p
144.    
     + h/ S( {  w/ Q& P' p
145. return (sum&0xffu);  
     0 t2 L; I  ~- O5 `- w6 o" w0 e" c
146. }  
     ; L3 z( m* _8 q; z
147.    
     % [7 R( k5 g5 }; L5 r
148. /**
     ) u# B0 u7 `# _4 Y& i0 Q
149.   *@brief  Receive a packet from sender
     
150.   *@param  data
     : E$ Z1 V4 K5 `- k( s5 M
151.   *@param  length
     
152.   *@param  timeout
     4 }3 z  {9 J/ g2 Y2 V5 c
153. *          0: end of transmission
     
154. *          -1: abort by sender
     : D- Q( g5 ~5 Q# a+ ^; x
155. *          >0: packet length
     
156.   *@retval 0: normally return
     ' O3 s  u8 A% U7 U$ ]5 _9 k! H( n
157. *         -1: timeout or packeterror
     
158. *         1: abort by user
     ' T7 C$ Y/ e( W( C* o
159.   */  
     
160. static int32_t Receive_Packet (uint8_t*data, int32_t *length, uint32_t timeout)  
     $ @: l2 S' `5 d1 z
161. {  
     
162. uint16_t i, packet_size, computedcrc;  
     & K- D6 S$ [8 `
163. uint8_t c;  
     
164. *length = 0;  
     - a" T( S" z& o0 ?' [/ @. j
165.   if(Receive_Byte(&c, timeout) != 0)  
     ; G: n- X6 f9 K: B8 L8 }1 V; w3 ^
166.   {  
     
167.    return -1;  
     
168.   }  
     ! e  F0 N' p6 S" ?( k- e6 H
169. switch (c)  
     * A1 Q. j' s) n/ N5 U1 U6 b
170.   {  
     
171.    case SOH:  
     % B0 m% H/ X/ `0 W- r
172.      packet_size = PACKET_SIZE;  
     $ e  l* o5 k/ b! f& K  Z# r; i
173.      break;  
     - a% \7 T' I; q- s$ i) c& o
174.    case STX:  
     
175.      packet_size = PACKET_1K_SIZE;  
     
176.      break;  
     $ D0 v* U! \! W- L( L
177.    case EOT:  
     7 X0 l1 X& A# g" S/ c9 W- X
178.      return 0;  
     , [' u8 |% u0 b- x
179.    case CA:  
     
180.      if ((Receive_Byte(&c, timeout) == 0) && (c == CA))  
     4 D6 g6 l/ C: i" W
181.      {  
     
182.        *length = -1;  
     
183.        return 0;  
     " G7 t; A, y, U+ s
184.      }  
     / t$ k# X% P! j7 I% x
185.      else  
     & u) a) e! a4 l" }
186.      {  
     
187.        return -1;  
     . G: c( L& o" B' U/ K
188.      }  
     
189.    case ABORT1:  
     
190.    case ABORT2:  
     , A# _2 p9 @, T( T) ]& u$ b9 C
191.      return 1;  
     ! A- \5 `% B& Z1 L, Y1 s! E
192.    default:  
     4 e8 x8 H" T( F" U; B0 f
193.      return -1;  
     
194.   }  
     
195. *data = c;  
     % v  @$ q3 W5 |7 _6 h
196.   for(i = 1; i < (packet_size + PACKET_OVERHEAD); i ++)  
     / `! C3 Y* t0 L; C4 n
197.   {  
     # h- }/ [3 L( x8 P# ]
198.    if (Receive_Byte(data + i, timeout) != 0)  
     
199.     {  
     # K" d- j; E" `6 P$ b% G
200.      return -1;  
     ' x/ x: {5 x) `1 f, N; D1 V/ J
201.     }  
     
202.   }  
     / p6 u0 i/ y6 N  {5 T
203.   if(data[PACKET_SEQNO_INDEX] != ((data[PACKET_SEQNO_COMP_INDEX] ^ 0xff) &0xff))  
     
204.   {  
     . C3 B2 S. y/ _: ~- Q" ]  m+ s3 S
205.    return -1;  
     % ]& l( p) e4 J
206.   }  
     . H9 [2 E) q5 T* ]. Z! R6 S' C
207.    
     $ X5 h3 P4 f  r2 ?, v% J6 @
208.   /*Compute the CRC */  
     2 i( Y1 P3 ~$ j! S% q" M
209. computedcrc = Cal_CRC16(&data[PACKET_HEADER],(uint32_t)packet_size);  
     " ?& `# |' c7 C' K0 w2 L
210.   /*Check that received CRC match the already computed CRC value
     8 v4 V! W) i' U
211.     data[packet_size+3]<<8) | data[packet_size+4] contains thereceived CRC
     
212.     computedcrc contains the computed CRC value */  
     ) e$ J* V7 _+ R4 \9 m& S6 R
213.   if(computedcrc != (uint16_t)((data[packet_size+3]<<8) |data[packet_size+4]))  
     
214.   {  
     1 l2 h* c! Q6 E# b
215.    /* CRC error */  
     
216.    return -1;  
     
217.   }  
     
218.    
     2 n+ f/ N1 }; Y7 ?
219. *length = packet_size;  
     2 N" M; r3 ?4 Q4 A! }* G, e5 E
220. return 0;  
     
221. }  
     
222.    
     
223. /**
     2 Y( j% t3 b, L0 n1 p. v
224.   *@brief  Receive a file using the ymodemprotocol
     + d: F. a; E# O/ G) s( \7 J5 J
225.   *@param  buf: Address of the first byte
     6 N' C7 ?" l& u
226.   *@retval The size of the file
     
227.   */  
     7 l  t) z4 C/ U) Z; i
228. int32_t Ymodem_Receive (uint8_t *buf)  
     ' i* H/ L, K& t( q  F
229. {  
     6 \0 X" \& B+ M8 R% D1 K1 K
230. uint8_t packet_data[PACKET_1K_SIZE + PACKET_OVERHEAD],file_size[FILE_SIZE_LENGTH], *file_ptr, *buf_ptr;  
     5 }  L, J; ]' J$ Q2 a+ Q% n* c
231. int32_t i, packet_length, session_done, file_done, packets_received,errors, session_begin, size = 0;  
     
232. uint32_t flashdestination, ramsource;  
     ) x7 V+ [  x: K% i8 y9 E" O2 \9 d
233.    
     
234.   /*Initialize flashdestination variable */  
     
235. flashdestination = APPLICATION_ADDRESS;  
     
236.    
     7 J' D4 _7 ]. K5 I, i% k( U6 V( u5 O
237.   for(session_done = 0, errors = 0, session_begin = 0; ;)  
     ; S9 C6 j2 }* v% ^
238.   {  
     
239.    for (packets_received = 0, file_done = 0, buf_ptr = buf; ;)  
     
240.     {  
     * v' u- w$ T$ D, T0 Y! W; O
241.      switch (Receive_Packet(packet_data, &packet_length, NAK_TIMEOUT))  
     
242.      {  
     
243.        case 0:  
     
244.          errors = 0;  
     . U  N: D! u$ Z" [5 b  C
245.          switch (packet_length)  
     
246.          {  
     
247.            /* Abort by sender */  
     ( V) e4 O4 V( `) W5 y  g6 z4 a
248.            case - 1:  
     
249.               Send_Byte(ACK);  
     6 c: C7 G6 ^0 r9 l
250.               return 0;  
     # x! F9 l' j; l  t, m
251.            /* End of transmission */  
     
252.            case 0:  
     
253.               Send_Byte(ACK);  
     
254.               file_done = 1;  
     2 b& Z2 o, I3 T7 I" `" I, j
255.               break;  
     
256.            /* Normal packet Õý³£Çé¿öϵİü*/  
     : m- _! p9 }- n, @6 z3 j( k$ h1 i  g
257.            default:  
     0 q2 l7 _6 Y) A1 W: Q! r4 ~- H
258.               if((packet_data[PACKET_SEQNO_INDEX] & 0xff) != (packets_received & 0xff))  
     
259.               {  
     : D/ R; o  H; f% c. O
260.                 Send_Byte(NAK);  
     0 i: r8 O0 p# U. T3 ?
261.               }  
     
262.               else  
     : |2 x4 u0 n* ^" j, r  i" r9 C
263.               {  
     
264.                 if (packets_received == 0)  
     * R  k% G$ d* a( H( l
265.                 {  
     + K3 m. T" d  m/ V5 m  o- O$ O
266.                   /* Filename packet */  
     
267.                   if(packet_data[PACKET_HEADER] != 0)  
     
268.                   {  
     % _" ?5 y# u. y" g" @
269.                     /* Filename packet hasvalid data */  
     
270.                     for (i = 0, file_ptr =packet_data + PACKET_HEADER; (*file_ptr != 0) && (i <FILE_NAME_LENGTH);)  
     $ \5 r$ e# G$ C
271.                     {  
     & X0 S: z  O+ h0 v/ Q1 C8 e8 I
272.                       FileName[i++] =*file_ptr++;  
     7 ?9 i! m8 N3 ?) M" P" T
273.                     }  
     
274.                     FileName[i++] = '\0';  
     
275.                     for (i = 0, file_ptr ++;(*file_ptr != ' ') && (i < (FILE_SIZE_LENGTH - 1));)  
     
276.                     {  
     
277.                       file_size[i++] =*file_ptr++;  
     
278.                     }  
     
279.                     file_size[i++] = '\0';  
     . O: O5 N: _7 u1 E
280.                     Str2Int(file_size,&size);  
     
281.    
     
282.                     /* Test the size of theimage to be sent */  
     7 f+ |. j' w5 h$ m6 w% f
283.                     /* Image size is greaterthan Flash size */  
     ! a+ Z: x8 `- F9 g" z6 a8 q7 X5 l, q
284.                     if (size >(USER_FLASH_SIZE + 1))  
     
285.                     {  
     
286.                       /* End session */  
     
287.                       Send_Byte(CA);  
     8 z7 x0 B0 ?% @1 ~: d, b
288.                       Send_Byte(CA);  
     0 p3 B8 {% l& n
289.                       return -1;  
     
290.                     }  
     
291.                     /* erase user applicationarea */  
     
292.                     FLASH_If_Erase(APPLICATION_ADDRESS);  
     1 I- h+ u! Y( a$ h' U7 J% }
293.                     Send_Byte(ACK); // ACK  and 'C' ?  
     
294.                     Send_Byte(CRC16);  
     6 l( C( U, b: Y2 \. r- c
295.                   }  
     
296.                   /* Filename packet is empty,end session */  
     / u  L- _  N$ }+ ]: R4 Y5 ~4 o
297.                   else  
     7 A  B) Z3 f7 [3 y% s
298.                   {  
     
299.                     Send_Byte(ACK);  
     " v: e& I( L8 g/ _, o1 f
300.                     file_done = 1;  
     + I, C/ `$ l( O
301.                     session_done = 1;  
     
302.                     break;  
     9 |) f+ L- ?. \5 z0 w6 G
303.                   }  
     " ~! X) X! t* w2 `
304.                 }  
     " H- N1 W/ d" F8 ?' }' q
305.                 /* Data packet */  
     ! x  i$ m6 T2 V7 {, h( R. A
306.                 else   //Õý³£Çé¿öϽøÈë  
     
307.                 {  
     ' L: q+ ^! Z/ P0 ?' c# z; w+ f
308.                   memcpy(buf_ptr, packet_data +PACKET_HEADER, packet_length);  
     7 d( S. R8 e: {; p# E
309.                   ramsource =(uint32_t)buf;   //bufÊÇÒ»¸öÖ¸Õë  
     
310.    
     " ]3 o& ^, O5 l6 O: k# o3 s4 H
311.                   /* Write received data inFlash */  
     
312.                   if(FLASH_If_Write(&flashdestination, (uint32_t*) ramsource, (uint16_t)packet_length/4)  == 0)  //½«Êý¾ÝдÈëflash  
     - b; L( w3 |, c  _& Y
313.                   {  
     # j  u3 E6 @2 f& q" H4 L
314.                     Send_Byte(ACK);  //дÍêÒ»Ö¡Êý¾ÝÖ®ºó·¢ËÍÏìÓ¦  
     9 l' d7 [9 u9 M( X
315.                   }  
     ' W9 g. D) J& G) n& q! r
316.                   else /* An error occurredwhile writing to Flash memory */  
     ) \: s& d% y2 T$ @. W! H- [
317.                   {  
     
318.                     /* End session */  
     9 F# J5 T3 H$ L
319.                     Send_Byte(CA);  
     
320.                     Send_Byte(CA);  
     
321.                     return -2;  
     
322.                   }  
     
323.                 }  
     
324.                 packets_received ++;  //°üÊý+1  
     
325.                 session_begin = 1;  
     ' ]$ Q3 Y* J+ ]7 F
326.               }  
     
327.          }  
     7 [( |2 g) w+ l2 }* j
328.          break;  
     7 j, L* q/ n  e* E- J3 A0 h0 ?6 E5 a
329.        case 1:  
     ! ~* y. B) g% [; }3 {( c4 W
330.          Send_Byte(CA);  
     # J* F# x1 c1 `6 O
331.          Send_Byte(CA);  
     
332.          return -3;  
     7 M# Z* f- B3 E  t
333.        default:  
     
334.          if (session_begin > 0) //½ÓÊÕÒѾ­¿ªÊ¼£¬µ«ÊÇReceive_Packet(packet_data, &packet_length,NAK_TIMEOUT)¸Ãº¯Êý·µ»Ø´íÎó¡£  
     % j% ~9 z  T( p' S. s
335.          {  
     $ C& a3 q0 j( ^* L3 q3 {" u
336.            errors ++;  
     
337.          }  
     - J. x6 n! H* R1 G) t
338.          if (errors > MAX_ERRORS)  
     
339.          {  
     8 k$ b" }# t" U$ A; l
340.            Send_Byte(CA);  
     ; D) A5 R6 W$ u; h! x; [
341.            Send_Byte(CA);  
     
342.            return 0;  
     
343.          }  
     
344.          Send_Byte(CRC16); // the start C!!  
     ( a, Y4 a" g  l. Y$ z
345.          break;  
     
346.      }  
     / w9 a$ V- K& T0 w  y
347.      if (file_done != 0)  
     " g: V% s; R' r" `4 z+ }3 m
348.      {  
       s* I/ q& A9 W1 v" G# ]# \
349.        break;  
     : q5 O" p1 i4 K$ z6 j9 r' Z
350.      }  
     
351.     }  
     
352.    if (session_done != 0)  
     
353.     {  
     
354.      break;  
     0 R  d$ Y% s" t% y
355.     }  
     , V3 \* F& C, s" x6 k# }$ n9 `1 A! W
356.   }  
     ( h/ Z0 F" E7 W. g+ t: Y6 N2 q7 n
357. return (int32_t)size;  
     # |- W# m# K$ w8 g! g1 U
358. }  
     
359.    
     " {' ?. F" e  w& e3 f& f! H2 {
360. /**
     ) |, m$ [) z& h) [+ \1 A
361.   *@brief  check response using the ymodemprotocol
     ( z' E2 Q9 z3 U
362.   *@param  buf: Address of the first byte
     7 P- A% r& }+ Q; a6 o
363.   *@retval The size of the file
     $ }" m% P9 A: n" O2 B* r
364.   */  
     ; U9 G9 B. d7 Z4 E; j0 ?
365. int32_t Ymodem_CheckResponse(uint8_t c)  
     
366. {  
     % X$ t+ g4 ^6 R7 {. ?7 C3 k  w
367. return 0;  
     
368. }  
     & ^: X4 ^6 m. k9 |; A, C$ K
369.    
     3 h2 }% _  r) B. A
370. /**
     : h$ X; n/ D: [; q
371.   *@brief  Prepare the first block
     8 i: }& B2 f+ k$ e5 K/ t
372.   *@param  timeout
     
373.   *@retval None
     . A+ u0 ]6 {4 c- o9 ?  j, d$ [! l
374.   */  
     ' A4 x1 E  a) Q$ l4 ]2 V
375. void Ymodem_PrepareIntialPacket(uint8_t*data, const uint8_t* fileName, uint32_t *length)  
     
376. {  
     
377. uint16_t i, j;  
       u' y+ x. D5 y2 V6 [0 ~
378. uint8_t file_ptr[10];  
     
379.    
     
380.   /*Make first three packet */  
     / I/ V9 @- |8 i5 `( U% l
381. data[0] = SOH;  
     
382. data[1] = 0x00;  
     
383. data[2] = 0xff;  
     
384.    
     
385.   /*Filename packet has valid data */  
     4 R& V6 [9 D% Z, B$ p  S. ~
386.   for(i = 0; (fileName[i] != '\0') && (i < FILE_NAME_LENGTH);i++)  
     
387.   {  
     
388.     data[i + PACKET_HEADER] = fileName[i];  
     
389.   }  
     4 X2 s. a2 \. U
390.    
     * t+ B4 ?7 E3 D3 d7 f6 {: E
391. data[i + PACKET_HEADER] = 0x00;  
     
392.    
     % K6 N- v* Y! `8 \5 U
393. Int2Str (file_ptr, *length);  
     
394.   for(j =0, i = i + PACKET_HEADER + 1; file_ptr[j] != '\0' ; )  
     
395.   {  
     
396.     data[i++] = file_ptr[j++];  
     7 K, J( S) }' f4 s! j' G, ^8 k
397.   }  
     : C9 x: S8 C/ `: g8 ~# i5 e
398.    
     
399.   for(j = i; j < PACKET_SIZE + PACKET_HEADER; j++)  
     
400.   {  
       [/ @, @+ P0 W
401.    data[j] = 0;  
     ' `, H) R+ W4 K' o1 o3 s
402.   }  
     
403. }  
     
404.    
     ' {, h/ f; U, j2 S
405. /**
     . W) Q$ N  d7 E4 t; w& u8 S
406.   *@brief  Prepare the data packet
     
407.   *@param  timeout
     
408.   *@retval None
     
409.   */  
     
410. void Ymodem_PreparePacket(uint8_t*SourceBuf, uint8_t *data, uint8_t pktNo, uint32_t sizeBlk)  
     4 Z- ?) d. c& P0 g; |5 p
411. {  
     # ?  F) e# {+ R/ D' E
412. uint16_t i, size, packetSize;  
     
413. uint8_t* file_ptr;  
     , F0 J" }2 O# R3 e  m; M0 L5 Z: c
414.    
     
415.   /*Make first three packet */  
     
416. packetSize = sizeBlk >= PACKET_1K_SIZE ? PACKET_1K_SIZE :PACKET_SIZE;  
     
417. size = sizeBlk < packetSize ? sizeBlk :packetSize;  
     0 n6 J+ a+ |; \0 g
418.   if(packetSize == PACKET_1K_SIZE)  
     7 G0 u0 D" J* L9 l
419.   {  
     , w' _: V* a! p, N0 v* L
420.     data[0] = STX;  
     
421.   }  
     ' K( j( _1 e8 M0 `& i& ]+ h9 e( v% [
422. else  
     + L% v$ O0 s% O5 L- ~/ c" T. E
423.   {  
     
424.     data[0] = SOH;  
     6 |' g, ]& Y6 w
425.   }  
     
426. data[1] = pktNo;  
     5 S; q* w( @' x! ?1 h
427. data[2] = (~pktNo);  
       M" c& A* S( t% n/ R/ t& _
428. file_ptr = SourceBuf;  
     & E5 }6 [2 q/ D2 I* k
429.    
     4 S7 K, ^8 u+ l4 d4 P( S( N" G
430.   /*Filename packet has valid data */  
     
431.   for(i = PACKET_HEADER; i < size + PACKET_HEADER;i++)  
     ; |& ^; W6 H6 J
432.   {  
     
433.     data[i] = *file_ptr++;  
     
434.   }  
     : d+ F" r6 r5 P- Y* d3 x3 z4 {+ {3 n
435.   if( size  <= packetSize)  
     - \% o$ S( f/ _3 O8 j  @7 m9 r
436.   {  
     & B. V0 L1 y. ], m! }% E
437.    for (i = size + PACKET_HEADER; i < packetSize + PACKET_HEADER; i++)  
     
438.     {  
     " r* d  m  _( M2 `* p# l4 D
439.      data[i] = 0x1A; /* EOF (0x1A) or 0x00 */  
     
440.     }  
     % `& m# W, j/ u; ?5 E3 a
441.   }  
     
442. }  
     8 z- L4 y2 q$ A! {: ~# |
443.    
     ) O: G) V$ L2 c' H, W
444. /**
     
445.   *@brief  Transmit a data packet using theymodem protocol
     
446.   *@param  data
     
447.   *@param  length
     - V- o/ I! ^+ h2 C5 e8 g  _# J8 ~
448.   *@retval None
     ; g% F/ n# q  Q2 D" S
449.   */  
     
450. void Ymodem_SendPacket(uint8_t *data,uint16_t length)  
     / d/ M6 S; `$ q
451. {  
     : I: G% ~) W: H% h' k5 J  [" ^
452. uint16_t i;  
     
453.   i =0;  
     
454. while (i < length)  
     & u) V; s# T; r0 B0 K2 V
455.   {  
     ' x# M) g. x; g& e3 B( M
456.    Send_Byte(data[i]);  
     
457.    i++;  
     0 u: J6 a: w# [
458.   }  
     
459. }  
       |9 S3 i" g* w, C6 \
460.    
     
461. /**
     
462.   *@brief  Transmit a file using the ymodemprotocol
     
463.   *@param  buf: Address of the first byte
     
464.   *@retval The size of the file
     2 q: u% v8 `5 ~- |4 J2 X
465.   */  
     7 O: A% x; v: h7 C+ M0 p
466. uint8_t Ymodem_Transmit (uint8_t *buf,const uint8_t* sendFileName, uint32_t sizeFile)  
     % ]9 Z6 K9 c/ `8 p) h; O% h9 A5 y3 C
467. {  
     $ `/ D9 g( @2 i( K' d
468. uint8_t packet_data[PACKET_1K_SIZE + PACKET_OVERHEAD];  
     3 j' E4 E& ^) p1 T- z) d
469. uint8_t FileName[FILE_NAME_LENGTH];  
     
470. uint8_t *buf_ptr, tempCheckSum ;  
     
471. uint16_t tempCRC, blkNumber;  
     % `, q  \/ Y3 y% K
472. uint8_t receivedC[2], CRC16_F = 0, i;  
     # o9 W. r: @( a( J
473. uint32_t errors = 0, ackReceived = 0, size = 0, pktSize;  
     
474.    
     
475.   for(i = 0; i < (FILE_NAME_LENGTH - 1); i++)  
     
476.   {  
     
477.    FileName[i] = sendFileName[i];  
     
478.   }  
     
479. CRC16_F = 1;  
     ' Y$ E3 P4 K$ r5 q( O$ Y
480.    
     
481.   /*Prepare first block */  
     + k  |: ^+ x6 f+ `& m5 m2 }
482. Ymodem_PrepareIntialPacket(&packet_data[0], FileName,&sizeFile);  
     
483.    
     
484.   do  
     ( j$ C( ^0 T: }. Q9 M
485.   {  
       u& J- b' L3 i) r, v) Q5 T7 e
486.    /* Send Packet */  
     
487.    Ymodem_SendPacket(packet_data, PACKET_SIZE + PACKET_HEADER);  
     ) S& E4 e9 m2 T7 S/ d
488.      
     
489.    /* Send CRC or Check Sum based on CRC16_F */  
     
490.    if (CRC16_F)  
     + V0 p& I$ Z1 E5 G# b# o7 z- n
491.     {  
     9 b" z8 M! N7 Y
492.       tempCRC = Cal_CRC16(&packet_data[3], PACKET_SIZE);  
     
493.       Send_Byte(tempCRC >> 8);  
     ; ~5 e2 g0 J# |; s0 O
494.       Send_Byte(tempCRC & 0xFF);  
     + S5 w" [/ W9 [$ z) A, C7 y5 o
495.     }  
     
496.    else  
     
497.     {  
     9 {. w# m! q/ A% t3 e8 t
498.       tempCheckSum = CalChecksum (&packet_data[3], PACKET_SIZE);  
     1 l! b. B& _6 P9 b$ H" u
499.       Send_Byte(tempCheckSum);  
     ' \2 l) c) k1 T, B7 H/ c( H" `
500.     }  
     
501.    
     
502.     /*Wait for Ack and 'C' */  
     
503.    if (Receive_Byte(&receivedC[0], 1000000) == 0)   
     
504.     {  
     
505.      if (receivedC[0] == ACK)  
     
506.      {  
     0 u  q8 a: W9 e2 J
507.        /* Packet transfered correctly */  
     3 T9 D4 x$ M' _: w
508.        ackReceived = 1;  
     
509.      }  
     
510.     }  
     
511.    else  
     
512.     {  
     
513.        errors++;  
     : r# N: F) x$ N  f
514.     }  
     6 l( q2 u6 f* M5 i  N- M/ k
515. }while (!ackReceived && (errors < 0x0A));  
     3 d6 {$ o$ X7 @7 ^5 V0 b& ?, W
516.    
     % Z+ M# d+ g, V1 D/ F! t0 M2 H
517.   if(errors >=  0x0A)  
     8 T7 |- O, N/ ]+ K* p: H4 b
518.   {  
     " l0 r) }% z+ z& [% o$ ?( f1 J' q& L
519.    return errors;  
     
520.   }  
     9 J, l2 q' [: g
521. buf_ptr = buf;  
     
522. size = sizeFile;  
     ) c9 S+ Y0 h% i$ ~( `, s$ z
523. blkNumber = 0x01;  
     2 D/ |. D+ W, D% ~
524.    
     
525.   /*Here 1024 bytes package is used to send the packets */  
     " G9 k7 S3 B& l% ]3 ]# `3 F+ X8 }' m
526. while (size)  
     9 j3 M  G$ O+ w/ i) r& S$ \
527.   {  
     + i# h  j6 n) {, m8 q; N1 b; e
528.    /* Prepare next packet */  
     
529.    Ymodem_PreparePacket(buf_ptr, &packet_data[0], blkNumber, size);  
     
530.    ackReceived = 0;  
     0 K3 i7 W# S' o4 n2 z5 p
531.    receivedC[0]= 0;  
     2 X: l5 R5 _: l3 }. c% U/ G
532.    errors = 0;  
     7 H! M) M& ]7 U# T2 O' l. e( M
533.    do  
     : I+ n, A. K% ]
534.     {  
     
535.      /* Send next packet */  
     
536.      if (size >= PACKET_1K_SIZE)  
     
537.      {  
     , x6 ~  o$ ^# T; J% e
538.        pktSize = PACKET_1K_SIZE;  
     
539.          
     3 \1 |: n& V+ V2 h
540.      }  
     
541.      else  
     
542.      {  
     
543.        pktSize = PACKET_SIZE;  
     
544.      }  
     
545.      Ymodem_SendPacket(packet_data, pktSize + PACKET_HEADER);  
     
546.      /* Send CRC or Check Sum based on CRC16_F */  
     # Q, _! {) B& ?7 _1 z
547.      if (CRC16_F)  
     ( [4 p6 d2 t1 h0 `9 \/ U& B6 O
548.      {  
     ) W5 O( s4 G! U! H# W
549.         tempCRC = Cal_CRC16(&packet_data[3], pktSize);  
     
550.         Send_Byte(tempCRC >> 8);  
     7 s9 W& x* m" w
551.         Send_Byte(tempCRC & 0xFF);  
     / G% @. Y( J4 p7 ]5 G2 t
552.      }  
     
553.      else  
     
554.      {  
     
555.        tempCheckSum = CalChecksum (&packet_data[3], pktSize);  
     
556.        Send_Byte(tempCheckSum);  
     0 o% j- P. z, _0 g
557.      }  
     : d* [, }( z/ g
558.       
     
559.      /* Wait for Ack */  
     
560.      if (Receive_Byte(&receivedC[0], 1000000) == 0)   
     
561.      {    if (receivedC[0] == ACK)  
     
562.      {  
     
563.        ackReceived = 1;   
     
564.        if (size > pktSize)  
     . I4 i4 d. \/ ?' J
565.        {  
     * }  g  D9 Z4 L0 s0 f. Z
566.           buf_ptr += pktSize;   
     
567.           size -= pktSize;  
     9 i0 y8 h& r" p! V' L8 w
568.           if (blkNumber == (USER_FLASH_SIZE/1024))  
     
569.           {  
     & U4 L+ v- Y7 @& B9 M
570.             return 0xFF; /*  error */  
     6 g6 q, C" M9 z* h
571.           }  
     
572.           else  
     * u- v6 ^: O2 O" `! S* d
573.           {  
     3 _4 j  }- X! U  D' Y8 W
574.               blkNumber++;  
     
575.           }  
     
576.        }  
     9 t( y' R! }( ]) A) w  D2 F+ m+ y
577.        else  
     
578.        {  
     % w) ?) o) k) {! N8 U! O
579.           buf_ptr += pktSize;  
     
580.           size = 0;  
     2 u+ u, T! c  |1 @
581.        }  
     
582.      }  
     
583.      }  
     
584.      else  
     ; w% `$ U% @, r8 d* m
585.      {  
     
586.        errors++;  
     / |' w0 D9 I# r2 w  \$ z# D  r
587.      }  
     
588.    }while(!ackReceived && (errors < 0x0A));  
     
589.      
     
590.    /* Resend packet if NAK  for acount of 10 else end of commuincation */  
     
591.    if (errors >=  0x0A)  
     
592.     {  
     
593.      return errors;  
     8 j/ k( X* ]+ o  C0 ]& D6 b, X
594.     }  
     $ ]3 I* d, k' @& w
595.      
     7 r5 v5 H+ S+ r% B1 i
596.   }  
     ) O+ P% p/ a6 C. K- x, d3 P
597. ackReceived = 0;  
     
598. receivedC[0] = 0x00;  
     1 o! o+ O: h1 E: f+ y6 P4 L% K
599. receivedC[1] = 0x00;  
     
600. errors = 0;  
     
601.   do  
     / R% U  o6 G" g, L2 H* `
602.   {  
     
603.    Send_Byte(EOT);   
     
604.    /* Send (EOT); */  
     & K% ?2 K9 A6 M6 l4 F& i4 x0 G; _0 [
605.    /* Wait for Ack */  
     1 U! W& y7 B# d) ?/ X- W
606.    receivedC[0] = USART_ReceiveData(USART1);  
     
607.    if (receivedC[0] == ACK)  
     
608.     {  
     
609.      ackReceived = 1;  
     9 i: V6 P1 o, i  _
610.      }  
     
611.      
     . W* U* Y* X4 x# t% \0 N0 |
612.    else  
     
613.     {  
     5 |# ~( d# `  o0 j( P
614.      errors++;  
     
615.     }  
     . n2 u5 o; F5 A, n
616.    /* Clear Overrun flag of the USART2 */  
     
617.    USART_ClearFlag(USART1, USART_FLAG_ORE);  
     
618. }while (!ackReceived && (errors < 0x0A));  
     
619.      
     . k2 o9 Q- |( n/ ^
620.   if(errors >=  0x0A)  
     
621.   {  
     , R, A+ E+ ~- G9 F! }& n. F, O2 E7 @
622.    return errors;  
     
623.   }  
     . v" g5 @6 T$ G; g3 k$ h' h0 m$ ]
624.    
     
625.   /*Last packet preparation */  
     
626. ackReceived = 0;  
     
627. receivedC[0] = 0x00;  
     * o5 c4 r& N4 I9 c8 ]
628. receivedC[1] = 0x00;  
     " o6 N4 L8 ?3 N, ^, `$ [0 O
629. errors = 0;  
     9 K3 u5 s3 W: r* d+ t# x
630.    
     
631. packet_data[0] = SOH;  
     4 K1 ?3 T6 t9 C! ^
632. packet_data[1] = 0;  
     
633. packet_data [2] = 0xFF;  
     
634.    
     
635.   for(i = PACKET_HEADER; i < (PACKET_SIZE + PACKET_HEADER); i++)  
     
636.   {  
     
637.     packet_data [i] = 0x00;  
     ; O' a2 s2 P5 n: G4 \( I' V0 Q
638.   }  
     % u; ^  {& Z$ a* z3 \
639.    
     
640.   do  
     8 O+ @; |% l# J7 L% {' o2 W
641.   {  
     
642.    /* Send Packet */  
     
643.    Ymodem_SendPacket(packet_data, PACKET_SIZE + PACKET_HEADER);  
     
644.    
     0 }/ J6 E" }+ ^% x' h
645.    /* Send CRC or Check Sum based on CRC16_F */  
     
646.     tempCRC = Cal_CRC16(&packet_data[3],PACKET_SIZE);  
     , j: v4 x! W( i* \) Y& h
647.    Send_Byte(tempCRC >> 8);  
     / V, g% ?- J( w& c' h1 N# O7 }
648.    Send_Byte(tempCRC & 0xFF);  
     0 }: {- j* k! L, W. h! N
649.    
     % _  U. i& D% h# N
650.    /* Wait for Ack and 'C' */  
     # K- F5 b9 b( ~& C+ w
651.    if (Receive_Byte(&receivedC[1], 1000000) == 0)   
     . O0 `* `$ ^# K( Q- Z: q8 B+ T8 s6 _
652.     {  
     ! Q4 B. I% l, J5 p2 c, S
653.      if (receivedC[1] == ACK)  
     # C- C/ y# P; V% x, k' i. g- s
654.      {  
     + _5 Q+ M" S' {( q5 ?+ A. H
655.        /* Packet transfered correctly */  
     5 F! P  l! x- Q$ B+ ^, U+ `: t% ?
656.        ackReceived = 1;  
     ; R6 n2 R3 {0 ~) L& J% p
657.      }  
     
658.     }  
     
659.    else  
     * b, t: p! s! r
660.     {  
     
661.      errors++;  
     
662.     }  
     
663. }while (!ackReceived && (errors < 0x0A));  
     
664.    
     
665.   /*Resend packet if NAK  for a count of10  else end of commuincation */  
     # X! g$ `$ q: D+ n
666.   if(errors >=  0x0A)  
     
667.   {  
     7 {0 \3 i2 ~" H: v/ \% K( p; R) T
668.    return errors;  
     
669. }   
     # k0 w0 n" v, Y) {, |9 e; v
670. receivedC[0] = 0x00;  
     
671.   do  
     ; E. m7 R+ J6 W* s: R
672.   {  
     - N9 ^; @3 y+ O" p
673.    Send_Byte(EOT);   
     
674.    /* Send (EOT); */  
     
675.    /* Wait for Ack */  
     3 B+ T6 H3 J( i  D' j. q! {
676.    if ((Receive_Byte(&receivedC[0], 1000000) == 0)  && receivedC[0] == ACK)  
     
677.     {  
     / G6 u* d. O" T9 {; ]; ^) T
678.      ackReceived = 1;   
     
679.     }  
     5 _$ }+ U' ]( k# V1 R& [
680.      
     9 R! N+ P1 I0 ^1 Y$ B- U7 i  H; i
681.    else  
     
682.     {  
     
683.      errors++;  
     
684.     }  
     
685.    /* Clear Overrun flag of the USART2 */  
     / t7 u" o5 g0 T
686.    USART_ClearFlag(USART1, USART_FLAG_ORE);  
     
687. }while (!ackReceived && (errors < 0x0A));  
     
688.      
     4 D! Z& A, Y$ x
689.   if(errors >=  0x0A)  
     
690.   {  
     
691.    return errors;  
     & @( a+ y% X5 k  X2 i) {' f: Q
692.   }  
     5 L+ B$ m" P5 T1 ^( x
693. return 0; /* file trasmitted successfully */  
     
694. }  
     
695.    
     7 v5 `* R6 [8 k9 z
696. /**
     
697.   *@}
     2 E/ d1 j- D. W0 `
698.   */  
     
699.    
     , u+ I1 u% d2 e; I% X
700. /************************ (C) COPYRIGHTSTMicroelectronics *****END OF FILE****/

复制代码

然后就没有然后了，如果你还要然后可以博客下载完整工程看看。。(BY MetalSeed)

* {4 I% q3 q% T: ?" b

谢谢分享，，这就是官方库的工程吧

官方的东西，久不能搞点有新意的；炒冷饭

刚入门，正好用
谢谢版主提供教程资料!

源码呢

谢谢分享

请问一下，到哪下官方的IAP例程