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；
6 y, g1 A* ]  I1 [' I$ s' a  C8 t2.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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1. /*******************************************************************************
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2. //STM32F207VGT6 FOR ENC28J60
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3. //SPI2初始化/IO初始化等
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4. //SPI configuration
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5. @@ JUST FOR STM32F2XX
   
6. *******************************************************************************/
   
7. void ENC28J60_SPI2_Init(void)
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8. {
   
9.     SPI_InitTypeDef  SPI_InitStructure;
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10.     GPIO_InitTypeDef  GPIO_InitStructure;
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11. 
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12.      /*!< Enable the SPI2 clock */       
    
13.     RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
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14. 
    
15.     /*!< Enable GPIO clocks */
    
16.     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
    
17.     /*!< SPI2 pins configuration */
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18.    
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19.      /* Configure SPI2 pins as alternate function (No need to
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20.      configure PB12 since NSS will be managed by software) */  
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21.     GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_SPI2); //nss
    
22.     GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2); //sck
    
23.     GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2); //miso
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24.     GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2); //mosi
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25.    
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26.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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27.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // also 100Mhz
    
28.     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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29.     GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP; // GPIO_PuPd_DOWN
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30.     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    
31.     GPIO_Init(GPIOB, &GPIO_InitStructure);// PB13/14/15-SCK,MISO,MOSI
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32.       
    
33.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    
34.     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    
35.     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    
36.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
    
37.     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_12; // RESRT and CS for enc28j60
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38.     GPIO_Init(GPIOB, &GPIO_InitStructure);
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39.   
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40.     /*!< Configure enc28j60 interrupt pin in PullUp mode ********************/
    
41.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    
42.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
43.     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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44.     GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
    
45.     /*!< SPI2 pin configuration */
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46.     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //INT
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47.     GPIO_Init(GPIOB, &GPIO_InitStructure);
    
48. 
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49.     SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI设置为双线双向全双工
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50.     SPI_InitStructure.SPI_Mode = SPI_Mode_Master;//设置为主SPI
    
51.     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
    
52.     SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;//选择了串行时钟的稳态:时钟悬空高
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53.     SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;//数据捕获于第二个时钟沿
    
54.     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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55.     SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;//Fclk/2
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56.     SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; /* Initialize the SPI_FirstBit member */
    
57.     SPI_InitStructure.SPI_CRCPolynomial=7;
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58.     SPI_Init(SPI2, &SPI_InitStructure);
    
59.     SPI_Cmd(SPI2, ENABLE);
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60. 
    
61. }
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62. 
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63. /*******************************************************************************
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64. * Function Name  : SPI_ReadWriteByte
    
65. * 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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66. * Input          : unsigned char TxData
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67. * Output         : None
    
68. * Return         : unsigned char RxData
    
69. *******************************************************************************/
    
70. unsigned char SPI2_ReadWriteByte(unsigned char TxData)
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71. {
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72.     unsigned char RxData = 0;
    
73.     /* Wait till Transmit buffer is empty */
    
74.     while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
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75.     /* Send A data */       
    
76.     SPI_I2S_SendData(SPI2, TxData);
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77.     // while(SPI_I2S_GetFlagStatus(SPI3, SPI_I2S_FLAG_TXE) == RESET);
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78.     //等待数据接收
    
79.     while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
    
80.     //取数据
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81.     RxData = SPI_I2S_ReceiveData(SPI2);
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82.     return (unsigned char)RxData;
    
83. }
    
84. 
    
85. 
    

复制代码

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这个用来做什么的？

驱动你的spi外设~

好资料，谢谢分享