各位大神，小弟最近刚学STM32，关于SPI基于DMA方式的通信，遇到了一个问题，SPI1作主机发送20个数据，可为毛SPI2作从机收到的全是0x00 啊？求解啊...
main.c文件的程序：
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_spi.h"
#include "stm32f10x_dma.h"
#include "platform_config.h"
#include "bsp_led.h"
#include "bsp_usart.h"
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
#define BufferSize 32
SPI_InitTypeDef SPI_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
uint8_t SPI_MASTER_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 SPI_SLAVE_Buffer_Rx[BufferSize];
__IO uint8_t TxIdx = 0;
volatile TestStatus TransferStatus = FAILED;
void RCC_Configuration(void);
void GPIO_Configuration(void);
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
int main(void)
{
uint32_t num;
LED_GPIO_Config();
USARTx_Config();
RCC_Configuration();
GPIO_Configuration();
DMA_DeInit(SPI_SLAVE_Rx_DMA_Channel);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI_SLAVE_DR_Base;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_SLAVE_Buffer_Rx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BufferSize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(SPI_SLAVE_Rx_DMA_Channel, &DMA_InitStructure);
/* SPI_MASTER configuration ------------------------------------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
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_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI_MASTER, &SPI_InitStructure);
/* SPI_SLAVE configuration ------------------------------------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_Init(SPI_SLAVE, &SPI_InitStructure);
/* Enable SPI_MASTER NSS output for master mode */
SPI_SSOutputCmd(SPI_MASTER, ENABLE);
/* Enable SPI_SLAVE Rx request */
SPI_I2S_DMACmd(SPI_SLAVE, SPI_I2S_DMAReq_Rx, ENABLE);
/* Enable SPI_SLAVE */
SPI_Cmd(SPI_SLAVE, ENABLE);
/* Enable SPI_MASTER */
SPI_Cmd(SPI_MASTER, ENABLE);
printf("\r\n 写入的数据为： \r\n");
for(num = 0; num < BufferSize; num++)
{
printf(&quot; 0x%02X &quot;, SPI_MASTER_Buffer_Tx[num]);
if(SPI_MASTER_Buffer_Tx[num] % 8 == 0)
printf(&quot;\r\n&quot;);
}
/* Enable DMA1 Channel4 */
DMA_Cmd(SPI_SLAVE_Rx_DMA_Channel, ENABLE);
/* Transfer procedure */
while (TxIdx < BufferSize)
{
/* Wait for SPI_MASTER Tx buffer empty */
while (SPI_I2S_GetFlagStatus(SPI_MASTER, SPI_I2S_FLAG_TXE) == RESET);
/* Send SPI_MASTER data */
SPI_I2S_SendData(SPI_MASTER, SPI_MASTER_Buffer_Tx[TxIdx++]);
}
/* Wait for DMA1 channel4 transfer complete */
while (!DMA_GetFlagStatus(SPI_SLAVE_Rx_DMA_FLAG));
/* Check the correctness of written data */
TransferStatus = Buffercmp(SPI_SLAVE_Buffer_Rx, SPI_MASTER_Buffer_Tx, BufferSize);
/* TransferStatus = PASSED, if the transmitted and received data
are equal */
/* TransferStatus = FAILED, if the transmitted and received data
are different */
printf(&quot; 读出的数据为： \r\n&quot;);
for(num = 0; num < BufferSize; num++)
{
printf(&quot; 0x%02X &quot;, SPI_SLAVE_Buffer_Rx[num]);
if(SPI_SLAVE_Buffer_Rx[num] % 8 == 0)
printf(&quot;\r\n&quot;);
}
if(TransferStatus == PASSED)
for(num = 0; num < 0xFFFF; num++)
LED_CIRCLE(num);
else
LEDx_TOGGLE(GPIO_Pin_5);
while (1)
{}
}
/**
* @brief Configures the different system clocks.
* @param None
* @retval None
*/
void RCC_Configuration(void)
{
/* PCLK2 = HCLK/2 */
// RCC_PCLK2Config(RCC_HCLK_Div2);
/* Enable peripheral clocks --------------------------------------------------*/
/* Enable SPI_SLAVE DMA clock */
RCC_AHBPeriphClockCmd(SPI_SLAVE_DMA_CLK, ENABLE);
/* Enable SPI_MASTER clock and GPIO clock for SPI_MASTER and SPI_SLAVE */
RCC_APB2PeriphClockCmd(SPI_MASTER_GPIO_CLK | SPI_SLAVE_GPIO_CLK |
SPI_MASTER_CLK, ENABLE);
/* Enable SPI_SLAVE Periph clock */
RCC_APB1PeriphClockCmd(SPI_SLAVE_CLK, ENABLE);
}
/**
* @brief Configures the different GPIO ports.
* @param None
* @retval None
*/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable SPI3 Pins Software Remapping */
/* Configure SPI_MASTER pins: SCK and MOSI */
GPIO_InitStructure.GPIO_Pin = SPI_MASTER_PIN_SCK | SPI_MASTER_PIN_MOSI;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SPI_MASTER_GPIO, &GPIO_InitStructure);
/* Configure SPI_MASTER NSS pin */
GPIO_InitStructure.GPIO_Pin = SPI_MASTER_PIN_NSS;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SPI_MASTER_GPIO_NSS, &GPIO_InitStructure);
/* Configure SPI_SLAVE pins: NSS, SCK and MISO*/
GPIO_InitStructure.GPIO_Pin = SPI_SLAVE_PIN_NSS | SPI_SLAVE_PIN_SCK;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(SPI_SLAVE_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = SPI_SLAVE_PIN_MISO;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SPI_SLAVE_GPIO, &GPIO_InitStructure);
}
/**
* @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;
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(&quot;Wrong parameters value: file %s on line %d\r\n&quot;, file, line) */
/* Infinite loop */
while (1)
{}
}
#endif
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
platform_config.h文件：
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __PLATFORM_CONFIG_H
#define __PLATFORM_CONFIG_H
/* Includes ------------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* Uncomment the line corresponding to the STMicroelectronics evaluation board
used to run the example */
#define SPI_MASTER SPI1
#define SPI_MASTER_CLK RCC_APB2Periph_SPI1
#define SPI_MASTER_GPIO GPIOA
#define SPI_MASTER_GPIO_NSS GPIOC
#define SPI_MASTER_GPIO_CLK RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC
#define SPI_MASTER_PIN_NSS GPIO_Pin_0
#define SPI_MASTER_PIN_SCK GPIO_Pin_5
#define SPI_MASTER_PIN_MISO GPIO_Pin_6
#define SPI_MASTER_PIN_MOSI GPIO_Pin_7
#define SPI_SLAVE SPI2
#define SPI_SLAVE_CLK RCC_APB1Periph_SPI2
#define SPI_SLAVE_GPIO GPIOB
#define SPI_SLAVE_GPIO_CLK RCC_APB2Periph_GPIOB
#define SPI_SLAVE_PIN_NSS GPIO_Pin_12
#define SPI_SLAVE_PIN_SCK GPIO_Pin_13
#define SPI_SLAVE_PIN_MISO GPIO_Pin_14
#define SPI_SLAVE_PIN_MOSI GPIO_Pin_15
#define SPI_SLAVE_DMA DMA1
#define SPI_SLAVE_DMA_CLK RCC_AHBPeriph_DMA1
#define SPI_SLAVE_Rx_DMA_Channel DMA1_Channel4
#define SPI_SLAVE_Rx_DMA_FLAG DMA1_FLAG_TC4
// #define SPI_SLAVE_Tx_DMA_Channel DMA1_Channel5
// #define SPI_SLAVE_Tx_DMA_FLAG DMA1_FLAG_TC5
#define SPI_SLAVE_DR_Base 0x4000380C
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
#endif /* __PLATFORM_CONFIG_H */
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/ |
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