前言
G4板载了一块M24C02(eeprom)和一块MCP4017(可编程电阻)，省赛中多考M24C02，本篇文章讲述如何用软件I2驱动M24C02。

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1.原理图以及配置元素

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分析:由图可知，PB6为I2C的SCL线，PB7为I2C的SDA线
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2.CubeMx的配置步骤

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9 ]+ c2 {; g4 F+ K0 [. B大赛是提供了I2C的驱动的这里我们只需要把两个引脚设置输出模式就行了，不再需要其他步骤。
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3.生成工程

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0 \. Z9 }1 Y2 C3 v4 G8 {0 A将红框中的两个文件复制黏贴到工程文件夹中的bsp文件夹中并改名为i2c.c和i2c.h。
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* N! H  O. \/ w, v在bsp文件中新建i2cc.c和i2c.h文件
( I: x) `& {0 c打开工程将两个文件添加到工程中去

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; ~8 H! `; \; {3 m; c/ x7 t9 K至此工程就建立完毕了
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4.测试代码
7 g) {. y. e) L, @i2c.h:

1. #ifndef __I2C_H
   
2. #define __I2C_H
   
3. 
   
4. #include "main.h"
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5. 
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6. void I2CStart(void);
   
7. void I2CStop(void);
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8. unsigned char I2CWaitAck(void);
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9. void I2CSendAck(void);
   
10. void I2CSendNotAck(void);
    
11. void I2CSendByte(unsigned char cSendByte);
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12. unsigned char I2CReceiveByte(void);
    
13. void I2CInit(void);
    
14. 
    
15. /*******下方为自己添加的函数声明**************/
    
16. unsigned char eeprom_read(unsigned char addr);
    
17. void eeprom_write(unsigned char addr, unsigned char dat);
    
18. 
    
19. #endif
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20. 
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复制代码

i2c.c:

1. #include "i2c.h"
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2. 
   
3. #define DELAY_TIME        20
   
4. 
   
5. 
   
6. /**
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7.   * @brief SDA线输入模式配置
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8.   * @param None
   
9.   * @retval None
   
10.   */
    
11. void SDA_Input_Mode()
    
12. {
    
13.     GPIO_InitTypeDef GPIO_InitStructure = {0};
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14. 
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15.     GPIO_InitStructure.Pin = GPIO_PIN_7;
    
16.     GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
    
17.     GPIO_InitStructure.Pull = GPIO_PULLUP;
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18.     GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
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19.     HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
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20. }
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21. 
    
22. /**
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23.   * @brief SDA线输出模式配置
    1 d! {  n5 E% m/ H- W0 ?/ ^$ ~
24.   * @param None
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25.   * @retval None
    # s/ x5 v  D* Q! X1 T9 T9 V% W
26.   */
    5 n8 m2 Z: R% H% @
27. void SDA_Output_Mode()
    
28. {
    
29.     GPIO_InitTypeDef GPIO_InitStructure = {0};
    
30. 
    
31.     GPIO_InitStructure.Pin = GPIO_PIN_7;
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32.     GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_OD;
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33.     GPIO_InitStructure.Pull = GPIO_NOPULL;
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34.     GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
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35.     HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
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36. }
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37. 
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38. /**
    
39.   * @brief SDA线输出一个位
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40.   * @param val 输出的数据
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41.   * @retval None
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42.   */
    
43. void SDA_Output( uint16_t val )
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44. {
    
45.     if ( val )
    
46.     {
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47.         GPIOB->BSRR |= GPIO_PIN_7;
    # F5 v" j3 ?% i
48.     }
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49.     else
    
50.     {
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51.         GPIOB->BRR |= GPIO_PIN_7;
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52.     }
    
53. }
    
54. 
    
55. /**
    
56.   * @brief SCL线输出一个位
    
57.   * @param val 输出的数据
    1 a+ D0 S; E6 w( Z/ A" A
58.   * @retval None
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59.   */
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60. void SCL_Output( uint16_t val )
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61. {
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62.     if ( val )
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63.     {
    
64.         GPIOB->BSRR |= GPIO_PIN_6;
    
65.     }
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66.     else
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67.     {
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68.         GPIOB->BRR |= GPIO_PIN_6;
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69.     }
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70. }
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71. 
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72. /**
    6 k" ^# S( X4 W" D2 S
73.   * @brief SDA输入一位
    5 H- _) N2 {0 [$ A9 I8 O
74.   * @param None
    2 Z$ c! I; O# w, y
75.   * @retval GPIO读入一位
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76.   */
    
77. uint8_t SDA_Input(void)
    
78. {
    
79.         if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) == GPIO_PIN_SET){
    
80.                 return 1;
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81.         }else{
    
82.                 return 0;
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83.         }
    
84. }
    
85. 
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86. 
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87. /**
      \4 f# P5 G2 ]
88.   * @brief I2C的短暂延时
    
89.   * @param None
    
90.   * @retval None
    
91.   */
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92. static void delay1(unsigned int n)
    
93. {
    
94.     uint32_t i;
    5 n1 U2 u9 W  o6 T4 y
95.     for ( i = 0; i < n; ++i);
    
96. }
    
97. 
    8 _9 B9 l; E- |  a5 f. u
98. /**
    
99.   * @brief I2C起始信号
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100.   * @param None
     
101.   * @retval None
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102.   */
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103. void I2CStart(void)
     
104. {
     
105.     SDA_Output(1);
     
106.     delay1(DELAY_TIME);
     
107.     SCL_Output(1);
     
108.     delay1(DELAY_TIME);
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109.     SDA_Output(0);
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110.     delay1(DELAY_TIME);
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111.     SCL_Output(0);
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112.     delay1(DELAY_TIME);
     
113. }
     
114. 
     + E5 i8 U' }( h& F% n
115. /**
     # u' _- z" I/ g
116.   * @brief I2C结束信号
     
117.   * @param None
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118.   * @retval None
     
119.   */
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120. void I2CStop(void)
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121. {
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122.     SCL_Output(0);
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123.     delay1(DELAY_TIME);
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124.     SDA_Output(0);
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125.     delay1(DELAY_TIME);
     
126.     SCL_Output(1);
     
127.     delay1(DELAY_TIME);
     
128.     SDA_Output(1);
     
129.     delay1(DELAY_TIME);
     
130. 
     
131. }
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132. 
     
133. /**
     # L: I+ y& ~5 e/ P# ?  F
134.   * @brief I2C等待确认信号
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135.   * @param None
     
136.   * @retval None
     
137.   */
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138. unsigned char I2CWaitAck(void)
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139. {
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140.     unsigned short cErrTime = 5;
     
141.     SDA_Input_Mode();
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142.     delay1(DELAY_TIME);
     
143.     SCL_Output(1);
     
144.     delay1(DELAY_TIME);
     
145.     while(SDA_Input())
     
146.     {
     
147.         cErrTime--;
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148.         delay1(DELAY_TIME);
     - \6 F) r* Q& `
149.         if (0 == cErrTime)
     
150.         {
     
151.             SDA_Output_Mode();
     
152.             I2CStop();
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153.             return ERROR;
     
154.         }
     # S- N# Q9 t4 G# j  ~
155.     }
     
156.     SDA_Output_Mode();
     
157.     SCL_Output(0);
     
158.     delay1(DELAY_TIME);
     ' a. d) x* S  r3 e
159.     return SUCCESS;
     
160. }
     
161. 
     
162. /**
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163.   * @brief I2C发送确认信号
     
164.   * @param None
     
165.   * @retval None
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166.   */
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167. void I2CSendAck(void)
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168. {
     
169.     SDA_Output(0);
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170.     delay1(DELAY_TIME);
     
171.     delay1(DELAY_TIME);
     
172.     SCL_Output(1);
     
173.     delay1(DELAY_TIME);
     4 n9 H. j8 S  E
174.     SCL_Output(0);
     
175.     delay1(DELAY_TIME);
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176. 
     
177. }
     
178. 
     
179. /**
     , I3 F- W% _& \6 R+ S2 G
180.   * @brief I2C发送非确认信号
     
181.   * @param None
     
182.   * @retval None
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183.   */
     
184. void I2CSendNotAck(void)
     
185. {
     
186.     SDA_Output(1);
     
187.     delay1(DELAY_TIME);
     
188.     delay1(DELAY_TIME);
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189.     SCL_Output(1);
     
190.     delay1(DELAY_TIME);
     
191.     SCL_Output(0);
     
192.     delay1(DELAY_TIME);
     5 {! r8 l. o4 \( E
193. 
     
194. }
     # Z  c/ U; z5 G0 L
195. 
     
196. /**
     
197.   * @brief I2C发送一个字节
     ' N8 g  B' `% }8 o2 O
198.   * @param cSendByte 需要发送的字节
     
199.   * @retval None
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200.   */
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201. void I2CSendByte(unsigned char cSendByte)
     
202. {
     
203.     unsigned char  i = 8;
     
204.     while (i--)
     % E, O# W) g$ O; K6 l
205.     {
     
206.         SCL_Output(0);
     
207.         delay1(DELAY_TIME);
     + N* P# C2 I' L# ^6 m7 ^& Y
208.         SDA_Output(cSendByte & 0x80);
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209.         delay1(DELAY_TIME);
     ' d+ _, ~% ~& e  ?3 h+ k5 a
210.         cSendByte += cSendByte;
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211.         delay1(DELAY_TIME);
     . Z4 F4 o/ x' F: c6 _. \
212.         SCL_Output(1);
     
213.         delay1(DELAY_TIME);
     
214.     }
     
215.     SCL_Output(0);
     ( h# ^: _5 J% M
216.     delay1(DELAY_TIME);
     
217. }
     ' a0 p" A& H. e6 O4 Z
218. 
     
219. /**
     
220.   * @brief I2C接收一个字节
     ! P) u/ H. w. [/ G) w
221.   * @param None
     
222.   * @retval 接收到的字节
     ; L+ b, D& U3 I$ j
223.   */
     ; U1 H( Y' ]: o. L4 z5 [
224. unsigned char I2CReceiveByte(void)
     
225. {
     5 g% }+ Q4 E' p' G4 O, M
226.     unsigned char i = 8;
     
227.     unsigned char cR_Byte = 0;
     
228.     SDA_Input_Mode();
     6 P6 I& q- b, X
229.     while (i--)
     
230.     {
     # i( z3 m3 d8 ~
231.         cR_Byte += cR_Byte;
     
232.         SCL_Output(0);
     & |; _( o( X* g0 i$ i" D
233.         delay1(DELAY_TIME);
     
234.         delay1(DELAY_TIME);
     
235.         SCL_Output(1);
     # ]  i; h, ^. y2 ]' D$ t# `
236.         delay1(DELAY_TIME);
     : h" E) A* h+ b, z
237.         cR_Byte |=  SDA_Input();
     9 W3 d# w0 D% E! o
238.     }
     
239.     SCL_Output(0);
     6 |) R/ b# j! f& B6 e3 _
240.     delay1(DELAY_TIME);
     ; j6 u1 t3 F% Y
241.     SDA_Output_Mode();
     - @# k$ v% O$ i0 V9 V) M5 _
242.     return cR_Byte;
     8 c6 v6 X" ^- Y2 b! _
243. }
     
244. 
     9 _  ~( i) \% @2 _! f$ \- J
245. //
     
246. void I2CInit(void)
     
247. {
     
248.                 GPIO_InitTypeDef GPIO_InitStructure = {0};
     
249. 
     
250.     GPIO_InitStructure.Pin = GPIO_PIN_7 | GPIO_PIN_6;
     
251.     GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
     
252.     GPIO_InitStructure.Pull = GPIO_PULLUP;
     
253.     GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
     
254.     HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
     
255. }
     ' J8 P' Y  h- ^: {9 T8 v
256. 
     ( x7 ?; {9 [3 L4 Z
257. /**************以上是大赛提供的驱动**************************/
     
258. 
     
259. 
     1 s# L/ ^: G( S2 K, H- y# I4 {5 B0 U, |
260. /***********以下是自己写的对24C02的读写操作******************/
     
261. 
     
262. unsigned char eeprom_read(unsigned char addr)
     , _# [9 a+ B4 ]- B+ X
263. {
     
264.         unsigned char dat;
     7 B" F! J9 w/ P) l, \" ]9 Q
265.         
     
266.         I2CStart();
     , E' d& _1 e) e/ Q
267.         I2CSendByte(0xa0);
     / ]5 V+ U7 Q- C  M* u, h- B: L# y% @
268.         I2CWaitAck();
     ; P8 d  }  @9 u+ W. z, T
269.         I2CSendByte(addr);
     8 t6 b5 `4 u6 K; r) N4 s
270.         I2CWaitAck();
     
271.         I2CStop();
     " q4 a3 u+ {( t& ~4 L
272.         
     
273.         I2CStart();
     ; o3 ^, e" E' K. z1 P
274.         I2CSendByte(0xa1);
     1 J8 M" \6 n9 U1 J  M9 l; p, O7 S' ]
275.         I2CWaitAck();
     ' v! t7 v9 h6 E0 b1 y, _
276.         dat = I2CReceiveByte();
     ' D* ?7 O) h4 K# r2 m* t
277.         I2CWaitAck();
     
278.         I2CStop();
     
279.         
     & ]. g8 T" k9 ?" k/ p% o
280.         return dat;
     6 b" K0 b7 N, z5 h5 ]9 u
281. }
     9 E  t" B) T1 y+ k9 q8 F  r
282. 
     6 g/ b2 y# W8 I# c. w% S
283. 
     ' p6 F! G1 C3 B+ P& S5 f, K" c
284. void eeprom_write(unsigned char addr, unsigned char dat)
     
285. {
     
286.         I2CStart();
     
287.         I2CSendByte(0xa0);
     + T) R# `! u# P) `8 h
288.         I2CWaitAck();
     . d; E/ z4 h% W7 I4 v) r! t
289.         I2CSendByte(addr);
     7 Z! ]( ^2 e  f6 q$ {) R
290.         I2CWaitAck();
     ( k, [$ G$ k. v( A$ ]! L
291.         I2CSendByte(dat);
     $ W9 p% x( [6 s# U+ S7 W
292.         I2CWaitAck();
     3 e8 r2 ?4 Q3 x, Q: B9 ?+ F
293.         I2CStop();
     
294. }
     % b) |2 x9 s! O3 B, _4 Q
295. 
     

复制代码

2 c+ T% y1 D4 P. p* S; o( `main.c:
7 A& q% U, N4 U$ A& g* }# X

1. /* USER CODE BEGIN Header */
   
2. /**
   
3.   ******************************************************************************
   6 f  J5 y3 ?: r4 e
4.   * @file           : main.c
   3 y6 K: v/ a# W# o) U. i5 ]
5.   * @brief          : Main program body
   # W, i& p* R0 f0 }
6.   ******************************************************************************
   & H7 m  m# h1 S( E3 u- ]6 ]+ o
7.   * @attention
   
8.   *
   
9.   * <h2><center>© Copyright (c) 2023 STMicroelectronics.
   
10.   * All rights reserved.</center></h2>
    : H' ]4 Z7 @; _
11.   *
    
12.   * This software component is licensed by ST under BSD 3-Clause license,
    
13.   * the "License"; You may not use this file except in compliance with the
    2 h" j2 T5 {/ e3 F7 S' U+ O: r
14.   * License. You may obtain a copy of the License at:
    
15.   *                        opensource.org/licenses/BSD-3-Clause
    
16.   *
    ; O( A; w7 M1 Y9 \
17.   ******************************************************************************
    
18.   */
    
19. /* USER CODE END Header */
    & U% K7 R! z- z
20. /* Includes ------------------------------------------------------------------*/
    : ?+ C$ P3 S( }. H$ b  h
21. #include "main.h"
    * ~# B) f9 P2 _
22. #include "adc.h"
    4 ?6 N8 n, E  [' ^: F
23. #include "tim.h"
    " |% K! Y* N0 {" W4 [& ?. A
24. #include "gpio.h"
    
25. 
    
26. /* Private includes ----------------------------------------------------------*/
    ' F1 m7 O, F" g- B: M  `4 d' z- h. j
27. /* USER CODE BEGIN Includes */
    
28. #include "lcd.h"
    / V) D) v3 i- L" L4 {9 Q1 W2 K
29. #include "badc.h"
    ( K: P7 Y5 v! ~4 H! ]& X
30. #include "stdio.h"
    
31. #include "i2c.h"
    
32. #include "interrupt.h"
    , H# ?5 W/ T$ X
33. /* USER CODE END Includes */
    
34. 
    
35. /* Private typedef -----------------------------------------------------------*/
    
36. /* USER CODE BEGIN PTD */
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37. 
    % k. Q, L) _- g
38. /* USER CODE END PTD */
    
39. 
    
40. /* Private define ------------------------------------------------------------*/
    ' B8 ]/ h% Z' k& V# A# G  C
41. /* USER CODE BEGIN PD */
    ; I3 i4 }7 y2 S) i3 e9 d& |; }4 r
42. /* USER CODE END PD */
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43. 
    
44. /* Private macro -------------------------------------------------------------*/
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45. /* USER CODE BEGIN PM */
    # U$ e8 r2 v7 S4 O
46. 
    
47. /* USER CODE END PM */
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48. 
    
49. /* Private variables ---------------------------------------------------------*/
    
50. 
    
51. /* USER CODE BEGIN PV */
    4 B" c3 v; d3 O" D( N& x- R
52. extern struct keys key[4];
    
53. unsigned char adc1_L, adc1_H;
    
54. /* USER CODE END PV */
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55. 
    5 m. T6 z* V5 b
56. /* Private function prototypes -----------------------------------------------*/
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57. void SystemClock_Config(void);
    
58. /* USER CODE BEGIN PFP */
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59. 
    
60. /* USER CODE END PFP */
    
61. 
    
62. /* Private user code ---------------------------------------------------------*/
    
63. /* USER CODE BEGIN 0 */
    
64. 
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65. /* USER CODE END 0 */
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66. 
    2 s$ O' O9 t4 m5 h# p
67. /**
    9 V' o9 D# w* J! V1 i
68.   * @brief  The application entry point.
    
69.   * @retval int
    $ G+ E: {3 `, Q% X+ x
70.   */
    
71. int main(void)
    # z' M! H  d  N* I
72. {
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73.   /* USER CODE BEGIN 1 */
    $ P. ?3 {8 t# i( m
74. 
    / _% ?. J9 L" Y1 s8 j
75.   /* USER CODE END 1 */
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76. 
    ' [, ]% z9 _0 P! {4 k" D
77.   /* MCU Configuration--------------------------------------------------------*/
    
78. 
    
79.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    
80.   HAL_Init();
    * B+ B, F8 ?1 u/ r! l! z( }. E( l# l
81. 
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82.   /* USER CODE BEGIN Init */
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83. 
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84.   /* USER CODE END Init */
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85. 
    + ^' [6 b. S* i, q. S
86.   /* Configure the system clock */
    
87.   SystemClock_Config();
    
88. 
    # F8 k1 [( `' ^& i" \
89.   /* USER CODE BEGIN SysInit */
    * ?; W1 k  H7 c5 m/ h
90. 
    # P" n0 x2 W8 _% Z- x
91.   /* USER CODE END SysInit */
    
92. 
    
93.   /* Initialize all configured peripherals */
    
94.   MX_GPIO_Init();
    * H6 o7 j6 g3 P! n% @, L; b3 O. K
95.   MX_TIM3_Init();
    
96.   MX_TIM16_Init();
    6 K8 s2 w& I: d" i7 Q/ ]
97.   MX_TIM17_Init();
    5 F, t$ u) `* Z4 A8 x
98.   MX_ADC1_Init();
    
99.   MX_ADC2_Init();
    2 r. f+ N% ^) y# r8 j
100.   /* USER CODE BEGIN 2 */
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101.         LCD_Init();
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102.         LCD_Clear(Black);
     / B8 @' P( [5 z* _* L/ R8 @
103.         LCD_SetBackColor(Black);
     4 t9 ]2 q1 p: o3 {1 q
104.         LCD_SetTextColor(White);
     
105.         HAL_TIM_Base_Start_IT(&htim3);
     3 s2 F5 ~, W9 @, e3 J
106.   /* USER CODE END 2 */
     
107. 
     
108.   /* Infinite loop */
     7 b- y: d* T6 c  o; N/ y7 W
109.   /* USER CODE BEGIN WHILE */
       Z, D* w+ ~  |# N
110.   while (1)
     + D( s8 N3 Q: M* C. W# S+ |
111.   {
     
112.     /* USER CODE END WHILE */
     
113. 
     
114.     /* USER CODE BEGIN 3 */
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115.                 char text[30];
     ) f1 D3 v. J! f2 i: C- {
116.                 unsigned int adc1, adc2;
     % y4 j. c( w- t: J+ j
117.                 adc1 = getADC(&hadc1);
     ' ]4 `" \' S( @; d. C* v# w
118.                 sprintf(text, "    V1:%.2f", adc1 * 3.3 / 4096);
     
119.                 LCD_DisplayStringLine(Line4, (unsigned char *)text);
     + e+ B7 C) Y8 y' u: A/ v
120.                 adc2 = getADC(&hadc2);
     
121.                 sprintf(text, "    V2:%.2f", adc2 * 3.3 / 4096);
     
122.                 LCD_DisplayStringLine(Line5, (unsigned char *)text);
     
123.                 if(key[0].single_flag) //短按写入
     
124.                 {
     
125.                         adc1_L = adc1 & 0xff;
     
126.                         adc1_H = adc1 >> 8;
     # J9 X. l* |& N; X. g) v
127.                         eeprom_write(1, adc1_L);
     
128.                         HAL_Delay(10);
     
129.                         eeprom_write(2, adc1_H);
     $ N: y4 w6 W: y% k5 S
130.                         key[0].single_flag = 0;
     0 }/ q  a$ _" Q3 s
131.                 }
     
132.                 if(key[0].long_flag) //长按读出
     
133.                 {
     - u4 e% }: ]2 ^, \, |/ W4 _! H+ X
134.                         char text[30];
     
135.                         unsigned int eep_temp = (eeprom_read(2) << 8) + eeprom_read(1);
     
136.                         sprintf(text, "    ADC_eep=%.2f", eep_temp * 3.3 / 4096);
     . U% r$ D0 Q% k0 B" f! J3 Z
137.                         LCD_DisplayStringLine(Line8, (unsigned char *)text);
     
138.                         key[0].long_flag = 0;        
     1 @1 F1 \- A; [9 S. B- u
139.                 }
     
140.   }
       I. R' V2 I3 L7 p; k) N# `
141.   /* USER CODE END 3 */
     4 ?* W* V! }+ _$ r& _
142. }
     & [9 Q' V1 r, K+ [4 D" H! N. _* t
143. 
     
144. /**
     . I9 ~+ y" F5 H# t$ [
145.   * @brief System Clock Configuration
     ( S8 f' d3 u! g
146.   * @retval None
     
147.   */
     
148. void SystemClock_Config(void)
     
149. {
     
150.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
     + g$ `& k+ K: I" l0 E1 D: B
151.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
     - r0 _$ z( ?( N3 u) m# @
152.   RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
     8 d! f4 I7 \3 b
153. 
     / E; S. q' C# y, g+ ~( c2 l" a8 I
154.   /** Configure the main internal regulator output voltage
     
155.   */
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156.   HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
     
157.   /** Initializes the RCC Oscillators according to the specified parameters
     * p1 l$ L& y$ [0 i
158.   * in the RCC_OscInitTypeDef structure.
     & R: W- x# J4 x% E. Z/ U. F6 M
159.   */
     0 r) w) b9 t. M
160.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
     
161.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
     
162.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
     
163.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
     # P6 k0 t. M( ^) X
164.   RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV3;
     7 S+ {- Z3 ^1 P3 G1 h- H2 E$ t- a
165.   RCC_OscInitStruct.PLL.PLLN = 20;
     
166.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
     - o' B& v5 U  ~/ t- I& H8 i
167.   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
     0 i; y4 A, G) Y
168.   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
     
169.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
       o+ P4 t6 \9 P$ G1 [+ e+ n7 j
170.   {
     
171.     Error_Handler();
     4 _8 V+ n- a( |: H" b7 l2 U0 i
172.   }
     0 n. w9 f( c$ V6 a) e7 L
173.   /** Initializes the CPU, AHB and APB buses clocks
     
174.   */
     
175.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
     
176.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
     
177.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
     
178.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     
179.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
     
180.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
181. 
     ) @, l7 n& w$ w5 H  g% f
182.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
     
183.   {
     6 K, e+ ]2 _+ a4 w
184.     Error_Handler();
     
185.   }
     ; f% B3 \6 }' ?. `, ?% k; K6 I
186.   /** Initializes the peripherals clocks
     
187.   */
     / k" z; i: _* |9 R2 X+ @
188.   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC12;
     
189.   PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK;
     
190.   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
     6 K6 B( |' D- ?0 E% p# B& l
191.   {
     
192.     Error_Handler();
     
193.   }
     
194. }
     
195. 
     
196. /* USER CODE BEGIN 4 */
     
197. 
     
198. /* USER CODE END 4 */
     ; O. g9 {$ A* N' C7 E
199. 
     6 V6 f& Z6 D6 p
200. /**
     / w7 ]" D2 I1 I1 n  L; M
201.   * @brief  This function is executed in case of error occurrence.
     " G7 ~* I+ x2 u/ i
202.   * @retval None
     8 F2 B  ^# b, g
203.   */
     $ ]6 o0 Q# [9 O/ o
204. void Error_Handler(void)
     
205. {
     
206.   /* USER CODE BEGIN Error_Handler_Debug */
     
207.   /* User can add his own implementation to report the HAL error return state */
     1 D3 p; ^8 @5 T  S+ l# U0 b
208.   __disable_irq();
     + |, |" _& [- I; Z; E7 U  C
209.   while (1)
     
210.   {
     : q' w9 q, f7 B" ~6 F; y2 L% m
211.   }
     
212.   /* USER CODE END Error_Handler_Debug */
     + s/ ~( o" t9 W7 z. U% w
213. }
     
214. 
     
215. #ifdef  USE_FULL_ASSERT
     ' U) }9 g. A: x: ~7 p  e* j
216. /**
     
217.   * @brief  Reports the name of the source file and the source line number
     
218.   *         where the assert_param error has occurred.
     
219.   * @param  file: pointer to the source file name
     1 P& p* o. r2 r1 W4 l. C
220.   * @param  line: assert_param error line source number
     
221.   * @retval None
     # K2 |4 m0 d: K( W' t$ ~0 x4 N
222.   */
     
223. void assert_failed(uint8_t *file, uint32_t line)
     
224. {
     
225.   /* USER CODE BEGIN 6 */
     
226.   /* User can add his own implementation to report the file name and line number,
     " U# i4 r4 S1 f+ N
227.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
     
228.   /* USER CODE END 6 */
     
229. }
     8 b% I2 s. L" B4 N  m* o
230. #endif /* USE_FULL_ASSERT */
     
231. 
     
232. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
     
233. 
     

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