请教SPI两机通讯问题

1874548238 · 发表于 2013-9-13 18:28:43

我最近想弄一个SPI两机通信，但是有问题。目前还不能解决，请教高手！

1、我把两个都设置为全双工的时候，两个都收不到。

2、当我把从机设为只接收的时候，要按几次复位才能收得到数据，数据是正确的。

3、当我拔掉Jlink后，什么都没有打印出来。没收到数据，网上说是因为器件的上电时间比CPU的慢，导致初始化失败。这个怎么解决啊？

主机：

/**
**********************************************************
*file :
*author:
*version:
*date :
*brief:
**
***********************************************************
*@attention
*
*
*
*GPIO :
*
*
*<h2><center>&copy : CPYRIGHT 2013 LZ </center> <h2>
*************************************************************
**/
#include "stm32f10x.h"
#include "spimaster.h"
#include "usart1.h"

/* Private macro -------------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
/* Private define ------------------------------------------------------------*/
#define BufferSize 32
/* Private variables ---------------------------------------------------------*/
uint8_t SPIy_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};

uint8_t SPIy_Buffer_Rx[BufferSize];
__IO uint8_t TxIdx = 0, RxIdx = 0, k = 0;
volatile TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED;

TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);

void Delay(__IO u32 nCount)
{

for(; nCount != 0; nCount--);

}

/*
* ????????main
* ?è?? ???÷????
* ???? ????
* ???? ????
*/

int main(void)
{

Delay(0xffffee);

RCC_Configuration();
GPIO_Configuration();
SPIy_Configuration();

Rcc_Usart1_Configuration();
GPIO_Usart1_Configuraton();
Usart1_Configuration();

while (1)
{
while (TxIdx < BufferSize)
{
/* Wait for SPIy Tx buffer empty */
while (SPI_I2S_GetFlagStatus(SPIy, SPI_I2S_FLAG_TXE) == RESET);

/* Send SPIy data */
SPI_I2S_SendData(SPIy, SPIy_Buffer_Tx[TxIdx++]); //TxIdx++

printf("\r\n The Tx master value = %d \r\n",SPIy_Buffer_Tx[RxIdx]);

/* Wait for SPIy data reception */
while (SPI_I2S_GetFlagStatus(SPIy, SPI_I2S_FLAG_RXNE) == RESET);

/* Read SPIy received data */
SPIy_Buffer_Rx[RxIdx++] = SPI_I2S_ReceiveData(SPIy); //RxIdx++

printf("\r\n The Rx slave value = %d \r\n",SPIy_Buffer_Rx[RxIdx]); //RxIdx
}
}
}

/**
* @brief Compares two buffers.
* @param pBuffer1, pBuffer2: buffers to be compared.
* @param BufferLength: buffer's length
* @retval PASSED: pBuffer1 identical to pBuffer2
* FAILED: pBuffer1 differs from pBuffer2
*/
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
while (BufferLength--)
{
if (*pBuffer1 != *pBuffer2)
{
return FAILED;
}

pBuffer1++;
pBuffer2++;
}

return PASSED;
}

从机：

/**
**********************************************************
*file :
*author:
*version:
*date :
*brief:
**
***********************************************************
*@attention
*
*
*
*
*
*
*<h2><center>&copy : CPYRIGHT 2013 LZ </center> <h2>
*************************************************************
**/
#include "stm32f10x.h"
#include "spislave.h"
#include "usart1.h"
/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;

/* Private define ------------------------------------------------------------*/
#define BufferSize 32

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/

uint8_t SPIz_Buffer_Tx[BufferSize] = {0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E,
0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65,
0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C,
0x6D, 0x6E, 0x6F, 0x70};
uint8_t SPIz_Buffer_Rx[BufferSize];
__IO uint8_t TxIdx = 0, RxIdx = 0, k = 0;
volatile TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED;

TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);

void Delay(__IO u32 nCount)
{

for(; nCount != 0; nCount--);

}

/*
* ????????main
* ?è?? ???÷????
* ???? ????
* ???? ????
*/

int main(void)
{

Delay(0xffffee);

RCC_Configuration();
GPIO_Configuration();
SPIz_Configuration();

Rcc_Usart1_Configuration();
GPIO_Usart1_Configuraton();
Usart1_Configuration();

while (1)
{
/* Transfer procedure */
while (TxIdx < BufferSize)
{
// /* Wait for SPIz Tx buffer empty */
// while (SPI_I2S_GetFlagStatus(SPIz, SPI_I2S_FLAG_TXE) == RESET);

// /* Send SPIz data */
// SPI_I2S_SendData(SPIz, SPIz_Buffer_Tx[TxIdx++]);
//
// printf("\r\n The Tx slave value = %d \r\n",SPIz_Buffer_Tx[RxIdx]);

/* Wait for SPIz data reception */
while (SPI_I2S_GetFlagStatus(SPIz, SPI_I2S_FLAG_RXNE) == RESET);

/* Read SPIz received data */
SPIz_Buffer_Rx[RxIdx++] = SPI_I2S_ReceiveData(SPIz);

printf("\r\n The Rx slave value = %d \r\n",SPIz_Buffer_Rx[RxIdx]);

}
}
}

/**
* @brief Compares two buffers.
* @param pBuffer1, pBuffer2: buffers to be compared.
* @param BufferLength: buffer's length
* @retval PASSED: pBuffer1 identical to pBuffer2
* FAILED: pBuffer1 differs from pBuffer2
*/
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
while (BufferLength--)
{
if (*pBuffer1 != *pBuffer2)
{
return FAILED;
}

pBuffer1++;
pBuffer2++;
}

return PASSED;
}