分享一个STM32F2的SPI2主模式驱动OK

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caizhiwei 发布时间：2015-2-3 16:57

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特别注意NSS引脚的配置，见代码。
1.GPIO的配置与103系列的不同；
2.SPI功能更强大，比如支持CRC校验，配置与103系列不同；
其他特性请参考datasheet.

/*******************************************************************************
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//STM32F207VGT6 FOR ENC28J60
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//SPI2初始化/IO初始化等
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//SPI configuration
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@@ JUST FOR STM32F2XX* {- P$ k: @# h
*******************************************************************************/
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void ENC28J60_SPI2_Init(void)
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SPI_InitTypeDef SPI_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/*!< Enable the SPI2 clock */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);6 ?& | @) d1 m: g8 f% A
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/*!< Enable GPIO clocks */" |/ }2 S. K: W
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
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/*!< SPI2 pins configuration *// M- O. d4 `3 [- H; q# o
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/* Configure SPI2 pins as alternate function (No need to
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configure PB12 since NSS will be managed by software) */
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_SPI2); //nss w4 d: w6 K1 |6 B4 L, P
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2); //sck1 C+ l: H* D* @& [7 o
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2); //miso7 c1 n8 ^! b/ c
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2); //mosi; v# V: H: b/ E
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;' q; j+ }8 x& k) m2 g
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // also 100Mhz9 A2 s0 `3 V8 a* |# I' i
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;" E) \7 @8 s3 x& c$ p% z8 P
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // GPIO_PuPd_DOWN9 ^3 e S' b6 H4 v* j) a o& ~
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
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GPIO_Init(GPIOB, &GPIO_InitStructure);// PB13/14/15-SCK,MISO,MOSI
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; 5 T0 h2 X/ D( h; W" e2 d
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;- V% f) u, I4 Z4 `5 k( M
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_12; // RESRT and CS for enc28j60
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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/*!< Configure enc28j60 interrupt pin in PullUp mode ********************/9 B. R3 I* I. X: E
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;7 D6 T$ \3 g) o0 z/ F$ M8 _
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;" ?3 q- B% ^6 p' E, L n- ^2 @
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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/*!< SPI2 pin configuration */, D. I/ ?. I: `4 ~# q
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //INT. ^ r& B+ x: b
GPIO_Init(GPIOB, &GPIO_InitStructure);- \6 V) ?3 w( j# Z
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI设置为双线双向全双工: Q( x, y/ M+ Q& O% v2 Z
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;//设置为主SPI
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;//设置SPI的数据大小:SPI发送接收8位帧结构
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;//选择了串行时钟的稳态:时钟悬空高: j/ c% O* i: {/ ?- r: o' Z/ B
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;//数据捕获于第二个时钟沿! g# j+ q& S, s" C& j
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//(SPI_NSS_Soft)此时NSS引脚可以配置成普通GPIO去控制从设备
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;//Fclk/2
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; /* Initialize the SPI_FirstBit member */5 v' f: ^/ i$ i1 m1 B: F
SPI_InitStructure.SPI_CRCPolynomial=7;: L' N+ }& T- G+ e9 ^* ]. f" }
SPI_Init(SPI2, &SPI_InitStructure);
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SPI_Cmd(SPI2, ENABLE);1 Z5 A5 D% o* O" |# [
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}
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/*******************************************************************************, `0 O1 T6 ~. n; H
* Function Name : SPI_ReadWriteByte9 ~. S- W* F& l; f) T; {
* Description : SPI读写一个字节（发送完成后返回本次通讯读取的数据）
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* Input : unsigned char TxData
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* Output : None& g2 f- n9 D. x' t1 Z0 b& B
* Return : unsigned char RxData
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*******************************************************************************/4 e3 ?- F8 O6 m0 n+ B
unsigned char SPI2_ReadWriteByte(unsigned char TxData)" V- M3 S B7 h- P7 ~% o
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unsigned char RxData = 0;
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/* Wait till Transmit buffer is empty */ + I) y, n% {) P2 q O7 l
while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);( X/ J. P% ~" a$ I
/* Send A data */ * B3 o+ L! I: H8 K# ^( L
SPI_I2S_SendData(SPI2, TxData);* c6 s/ F8 J: m( C
// while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) == RESET);4 ?+ F( q" c+ O) d
//等待数据接收( D! v' z& d, x! ~$ M8 u0 N. E- }
while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
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//取数据
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RxData = SPI_I2S_ReceiveData(SPI2);
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return (unsigned char)RxData;0 q; u4 O% x+ _$ o% Y
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