我正在尝试在STM32MP157C-DK2板上的DMA模式下通过SPI发送数据。 目的是将数据从GPIO_PIN_8发送到GPIO_PIN_9并检查它们是否相同。
我尝试使用HAL_SPI_TransmitReceive_DMA函数，但我不确定该如何工作。它以发送缓冲区和接收缓冲区作为输入。但是如何告诉我要从引脚8（MOSI）发送到引脚9（MISO）的功能。以及如何查看和显示我正在发送的数据，以及如何检查另一针上的数据是否正确接收。
我是否必须给发送接收功能GPIOS地址而不是TX和RX缓冲区？但是如何告诉函数我要发送的数据。
我将GPIOS和SPI5配置如下：
#define BUFSIZE 1024
#define GPIOF_OutPut_Data (0x40010028)
#define GPIOF_Input_Data (0x44009000)+(0x30)
enum
{
TRANSFER_WAIT,
TRANSFER_COMPLETE,
TRANSFER_ERROR
};
/* Buffer used for transmission */
uint8_t aTxBuffer[] = "****SPI Message based on DMA ****";
/* Buffer used for reception */
uint8_t aRxBuffer[BUFSIZE];
/* transfer state */
__IO uint32_t wTransferState = TRANSFER_WAIT;
SPI_HandleTypeDef hspi5;
DMA_HandleTypeDef hdma_spi5_tx;
DMA_HandleTypeDef hdma_spi5_rx;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_IPCC_Init(void);
static void MX_SPI5_Init(void);
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
int main(void)
{
MX_GPIO_Init();
MX_DMA_Init();
MX_SPI5_Init();
/**SPI5 GPIO Configuration
PH6 ------> SPI5_SCK
PF8 ------> SPI5_MISO
PF9 ------> SPI5_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_8|GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI5;
// From Alternate Function Table from Data-sheet for Port F
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
//Transmit and Receive Data over SPI in DMA Mode
if(HAL_SPI_TransmitReceive_DMA(&hspi5, (uint8_t*)aTxBuffer, (uint8_t *)aRxBuffer, BUFSIZE) != HAL_OK)
{
/* Transfer error in transmission process */
printf("Entered Transmit Receive DMA Mode");
Error_Handler();
}
/*##-2- Wait for the end of the transfer ###################################*/
/* Before starting a new communication transfer, you must wait the callback call
to get the transfer complete confirmation or an error detection.
This code is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (wTransferState == TRANSFER_WAIT)
{
}
switch(wTransferState)
{
case TRANSFER_COMPLETE :
/*##-3- Compare the sent and received buffers ##############################*/
if(Buffercmp((uint8_t*)aTxBuffer, (uint8_t*)aRxBuffer, BUFSIZE))
//if buffers are identical, the return value should be 0, otherwise go to Error handler
{
/* Processing Error */
Error_Handler();
}
break;
default :
Error_Handler();
break;
}
}
static void MX_SPI5_Init(void)
{
/* USER CODE BEGIN SPI5_Init 0 */
/* USER CODE END SPI5_Init 0 */
/* USER CODE BEGIN SPI5_Init 1 */
/* USER CODE END SPI5_Init 1 */
/* SPI5 parameter configuration*/
hspi5.Instance = SPI5;
hspi5.Init.Mode = SPI_MODE_MASTER;
hspi5.Init.Direction = SPI_DIRECTION_2LINES;
hspi5.Init.DataSize = SPI_DATASIZE_16BIT;
hspi5.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi5.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi5.Init.NSS = SPI_NSS_SOFT;
hspi5.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
hspi5.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi5.Init.TIMode = SPI_TIMODE_DISABLE;
hspi5.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi5.Init.CRCPolynomial = 0x0;
hspi5.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
hspi5.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
hspi5.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
hspi5.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
hspi5.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
hspi5.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
hspi5.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
hspi5.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
hspi5.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
hspi5.Init.IOSwap = SPI_IO_SWAP_DISABLE;
if (HAL_SPI_Init(&hspi5) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN SPI5_Init 2 */
/* USER CODE END SPI5_Init 2 */
}
void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi)
{
wTransferState = TRANSFER_ERROR;
}
/**
* @brief Compares two buffers.
* @param pBuffer1, pBuffer2: buffers to be compared.
* @param BufferLength: buffer's length
* @retval 0 : pBuffer1 identical to pBuffer2
* >0 : pBuffer1 differs from pBuffer2
*/
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
while (BufferLength--)
{
if((*pBuffer1) != *pBuffer2)
{
return BufferLength;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
printf("No Transfer of Data");
while(1)
{
setvbuf (stdout, NULL, _IONBF, 0);
fprintf(stdout, "LED7 is blinking");
Delay_wait(0x5000000);
HAL_GPIO_TogglePin(GPIOH, GPIO_PIN_7);
}
/* USER CODE END Error_Handler_Debug */
}