原创 SPI应用笔记

 2009-11-24 16:46  2751 5 5 分类: MCU/ 嵌入式

/*******************************************************************************
SPI1以主机模式发送数据，SPI2以从机模式接收数据
********************************************************************************/

#include "stm32f10x_lib.h"

#define BufferSize 32

SPI_InitTypeDef   SPI_InitStructure;
u8 SPI1_Buffer_Tx[BufferSize] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
                                 0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,
                                 0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,
                                 0x1C,0x1D,0x1E,0x1F,0x20};

u8 SPI2_Buffer_Rx[BufferSize]; //用于存放SPI2接收到的数据
u8 Tx_Idx = 0, Rx_Idx = 0, k = 0;
//(BitActio：一个库中已经定义好的结构体，只有Bit_RESET=0和Bit_SET=1两个值)
BitAction TransferStatus1 = Bit_RESET; //此处把TransferStatus1定义为BitAction并附初值为Bit_RESET
//ErrorStatus也是一个库定义好的结构体只有ERROR = 0, SUCCESS = !ERROR两个值
ErrorStatus HSEStartUpStatus; //此处定义HSEStartUpStatus为ErrorStatus类型没有赋予初值

void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
BitAction Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength);//声明一个返回值为BitAction类型的函数

int main(void)
{
#ifdef DEBUG
debug();
#endif

   RCC_Configuration();
   NVIC_Configuration();
   GPIO_Configuration();

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

/* SPI2 Config -------------------------------------------------------------*/
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_Init(SPI2, &SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE);

SPI_Cmd(SPI2, ENABLE);

while(Tx_Idx<BufferSize)
{

    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==RESET);
    SPI_I2S_SendData(SPI1, SPI1_Buffer_Tx[Tx_Idx++]);
    while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE)==RESET);
    SPI2_Buffer_Rx[Rx_Idx++] = SPI_I2S_ReceiveData(SPI2);
}

TransferStatus1 = Buffercmp(SPI2_Buffer_Rx, SPI1_Buffer_Tx, BufferSize);
GPIO_WriteBit(GPIOA, GPIO_Pin_0, TransferStatus1);

while(1)
{
}
}

/*******************************************************************************
* Function Name : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();

/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if(HSEStartUpStatus == SUCCESS)
{
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK/2 */
    RCC_PCLK2Config(RCC_HCLK_Div2);

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
}

/* Enable peripheral clocks --------------------------------------------------*/
/* GPIOA, GPIOC and SPI1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_SPI1, ENABLE);
/* SPI2 Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
}

/*******************************************************************************
* Function Name : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Configure SPI1 pins: SCK, MISO and MOSI ---------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure SPI2 pins: SCK, MISO and MOSI ---------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description    : Configures NVIC and Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}

/*******************************************************************************
* Function Name : Buffercmp
* Description    : Compares two buffers.
* Input          : - pBuffer1, pBuffer2: buffers to be compared.
*                : - BufferLength: buffer's length
* Output         : None
* Return         : PASSED: pBuffer1 identical to pBuffer2
*                  FAILED: pBuffer1 differs from pBuffer2
*******************************************************************************/
BitAction Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength)
{
while(BufferLength--)
{
    if(*pBuffer1 != *pBuffer2)
    {
      return Bit_RESET;
    }

    pBuffer1++;
    pBuffer2++;
}

return Bit_SET;
}

#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

/* Infinite loop */
while (1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/

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