导语“我们在前面章节中使用了SDIO接口对SD卡进行读写操作,使用的轮询模式,这种模式效率低下,F103有SDIO接口的DMA模式,DMA模式在不需要CPU操作的情况下,自动的将数据进行读取和写入。”
第一节 系统要求
同第八章。
第二节 CubeMx配置
SDIO配置为4位的总线模式。
在DMA的配置中,SDIO的DMA通道只有一个,所以读和写之间需要进行方向改变。地址增长选择内存,这是因为我们把SDIO外设的数据发送到内存中,或从内存中读入数据。
在NVIC中断配置中,设置SDIO的中断优先级比DMA的优先级高。
玩成上述配置后,进行代码生成。
第三节 MDK代码编写
在stm32F103 中SDIO的DMA只有一个通道,因此读写是公用的,需要在读写之前进行方向配置,不能简单的调用HALSDReadBlocksDMA()库函数来完成读,不能简单的调用HALSDWriteBlocksDMA()来完成写操作。我们编写DIOReadBlocksDMA()、SDIOWriteBlocksDMA()来使用DMA模式。
(1)sdio.h
/* USER CODE BEGIN Private defines */
extern DMA_HandleTypeDef hdma_sdio;
/* USER CODE END Private defines */
/* USER CODE BEGIN Prototypes */
HAL_StatusTypeDef SDIO_ReadBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks);
HAL_StatusTypeDef SDIO_WriteBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks);
/* USER CODE END Prototypes */
在sdio.c中
/* USER CODE BEGIN 1 */
HAL_StatusTypeDef SDIO_ReadBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks)
{
HAL_StatusTypeDef Return_Status;
HAL_SD_CardStateTypeDef SD_Card_Status;
do
{
SD_Card_Status = HAL_SD_GetCardState(hsd);
}while(SD_Card_Status != HAL_SD_CARD_TRANSFER );
/* SDIO DMA DeInit */
/* SDIO DeInit */
HAL_DMA_DeInit(&hdma_sdio);
/* 改变DMA的方向,重新初始化 */
hdma_sdio.Instance = DMA2_Channel4;
hdma_sdio.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_sdio.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdio.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdio.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdio.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdio.Init.Mode = DMA_NORMAL;
hdma_sdio.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_sdio) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA( hsd,hdmarx,hdma_sdio);
Return_Status = HAL_SD_ReadBlocks_DMA( hsd,pData, BlockAdd, NumberOfBlocks);
return Return_Status;
}
HAL_StatusTypeDef SDIO_WriteBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks)
{
HAL_StatusTypeDef Return_Status;
HAL_SD_CardStateTypeDef SD_Card_Status;
do
{
SD_Card_Status = HAL_SD_GetCardState(hsd);
}while(SD_Card_Status != HAL_SD_CARD_TRANSFER );
/* SDIO DMA DeInit */
/* SDIO DeInit */
HAL_DMA_DeInit(&hdma_sdio);
/* 改变DMA的方向,重新初始化 */
hdma_sdio.Instance = DMA2_Channel4;
hdma_sdio.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_sdio.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdio.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdio.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdio.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdio.Init.Mode = DMA_NORMAL;
hdma_sdio.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_sdio) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(hsd,hdmatx,hdma_sdio);
Return_Status = HAL_SD_WriteBlocks_DMA(hsd,pData, BlockAdd, NumberOfBlocks);
return Return_Status;
}
在min.c中
/*SD 操作*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
/* 私有宏定义 ----------------------------------------------------------------*/
#define BLOCK_SIZE 512 // SD卡块大小
#define NUMBER_OF_BLOCKS 8 // 测试块数量(小于15)
#define WRITE_READ_ADDRESS 0x00002000 // 测试读写地址
#define SDMMC hsd
/* 私有变量 ------------------------------------------------------------------*/
__align(4) uint32_t Buffer_Block_Tx[BLOCK_SIZE*NUMBER_OF_BLOCKS]; // 写数据缓存
__align(4) uint32_t Buffer_Block_Rx[BLOCK_SIZE*NUMBER_OF_BLOCKS]; // 读数据缓存
HAL_StatusTypeDef sd_status; // HAL库函数操作SD卡函数返回值:操作结果
TestStatus test_status; // 数据测试结果
void SD_EraseTest_DMA();
void SD_Write_Read_Test_DMA();
HAL_StatusTypeDef Return_Status;
HAL_SD_CardStateTypeDef SD_Card_Status;
HAL_DMA_StateTypeDef DMA_Status;
在mian函数中:
//申明测试函数
SD_EraseTest_DMA();
SD_Write_Read_Test_DMA();
在main.c
/*************************************/
TestStatus eBuffercmp(uint32_t* pBuffer, uint32_t BufferLength)
{
while (BufferLength--)
{
/* SD卡擦除后的可能值为0xff或0 */
if ((*pBuffer != 0xFFFFFFFF) && (*pBuffer != 0))
{
return FAILED;
}
pBuffer++;
}
return PASSED;
}
void SD_EraseTest_DMA(void)
{
/* 第1个参数为SD卡句柄,第2个参数为擦除起始地址,第3个参数为擦除结束地址 */
sd_status=HAL_SD_Erase(&SDMMC,WRITE_READ_ADDRESS,WRITE_READ_ADDRESS+NUMBER_OF_BLOCKS*4);
printf("《SD》""erase status:%drn",sd_status);
HAL_Delay(500);
if (sd_status == HAL_OK)
{
/* 读取刚刚擦除的区域 */
sd_status = SDIO_ReadBlocks_DMA(&SDMMC,(uint8_t *)Buffer_Block_Rx,WRITE_READ_ADDRESS,NUMBER_OF_BLOCKS);
printf("《SD》""erase read status:%drn",sd_status);
/* 把擦除区域读出来对比 */
test_status = eBuffercmp(Buffer_Block_Rx,BLOCK_SIZE*NUMBER_OF_BLOCKS);
if(test_status == PASSED)
printf("《SD》""除测试成功!rn" );
else
printf("《SD》""擦除不成功,数据出错!rn" );
}
else
{
printf("《SD》""擦除测试失败!部分SD不支持擦除,只要读写测试通过即可rn" );
}
}
void Fill_Buffer(uint32_t *pBuffer, uint32_t BufferLength, uint32_t Offset)
{
uint32_t index = 0;
/* 填充数据 */
for (index = 0; index < BufferLength; index++ )
{
pBuffer[index] = index + Offset;
}
}
TestStatus Buffercmp(uint32_t* pBuffer1, uint32_t* pBuffer2, uint32_t BufferLength)
{
while (BufferLength--)
{
if(BufferLength%50==0)
{
printf("buf:0x%08X - 0x%08Xrn",*pBuffer1,*pBuffer2);
}
if (*pBuffer1 != *pBuffer2)
{
return FAILED;
}
pBuffer1++;
pBuffer2++;
}
return PASSED;
}
void SD_Write_Read_Test_DMA(void)
{
printf(" Warning: this program may erase all the TF card data. rn");
printf("rn Initialize SD card successfully!rnrn");
printf(" SD card information! rn");
printf(" CardCapacity : %llu rn",((unsigned long long)SDMMC.SdCard.BlockSize*hsd.SdCard.BlockNbr));
printf(" CardBlockSize : %d rn",SDMMC.SdCard.BlockSize);
printf(" RCA : %d rn",SDMMC.SdCard.RelCardAdd);
printf(" CardType : %d rn",SDMMC.SdCard.CardType);
int i,j = 0;
/* 填充数据到写缓存 */
Fill_Buffer(Buffer_Block_Tx,BLOCK_SIZE*NUMBER_OF_BLOCKS, 0x6666);
/* 往SD卡写入数据 */
sd_status = SDIO_WriteBlocks_DMA(&SDMMC,(uint8_t *)Buffer_Block_Tx,WRITE_READ_ADDRESS,NUMBER_OF_BLOCKS);
printf("《SD》""write status:%drn",sd_status);
HAL_Delay(600);
/* 从SD卡读取数据 */
sd_status = SDIO_ReadBlocks_DMA(&SDMMC,(uint8_t *)Buffer_Block_Rx,WRITE_READ_ADDRESS,NUMBER_OF_BLOCKS);
printf("《SD》""read status:%drn",sd_status);
/* 比较数据 */
test_status = Buffercmp(Buffer_Block_Tx, Buffer_Block_Rx, BLOCK_SIZE*NUMBER_OF_BLOCKS/4); //比较
if(test_status == PASSED)
{
printf("《SD》""》读写测试成功!rn" );
for(i=0;i
第四节 效果演示
可以看到能够正确的使用DMA进行SD卡的读写操作。
第五节 补充DMA 补充
我们在上一节中使用DMA的使用读写过程中要改变DMA的方向,在每个读写函数中进行,可以单独实现:
在sdio.h
HAL_StatusTypeDef SD_DMAConfigRX(SD_HandleTypeDef *hsd);
HAL_StatusTypeDef SD_DMAConfigTX(SD_HandleTypeDef *hsd);
HAL_StatusTypeDef SDIO_ReadBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks);
HAL_StatusTypeDef SDIO_WriteBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks);
在sdio.c 中
HAL_StatusTypeDef SDIO_ReadBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks)
{
HAL_StatusTypeDef Return_Status;
HAL_SD_CardStateTypeDef SD_Card_Status;
do
{
SD_Card_Status = HAL_SD_GetCardState(hsd);
}while(SD_Card_Status != HAL_SD_CARD_TRANSFER );
if (SD_DMAConfigRX(hsd) != HAL_OK)
{
return HAL_ERROR;
}
else
{
Return_Status = HAL_SD_ReadBlocks_DMA( hsd,pData, BlockAdd, NumberOfBlocks);
return Return_Status;
}
}
HAL_StatusTypeDef SDIO_WriteBlocks_DMA(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks)
{
HAL_StatusTypeDef Return_Status;
HAL_SD_CardStateTypeDef SD_Card_Status;
do
{
SD_Card_Status = HAL_SD_GetCardState(hsd);
}while(SD_Card_Status != HAL_SD_CARD_TRANSFER );
if (SD_DMAConfigTX(hsd) != HAL_OK)
{
return HAL_ERROR;
}
else
{
Return_Status = HAL_SD_WriteBlocks_DMA(hsd,pData, BlockAdd, NumberOfBlocks);
return Return_Status;
}
}
HAL_StatusTypeDef SD_DMAConfigRX(SD_HandleTypeDef *hsd)
{
HAL_StatusTypeDef status = HAL_ERROR;
hdma_sdio.Instance = DMA2_Channel4;
hdma_sdio.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_sdio.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdio.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdio.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdio.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdio.Init.Mode = DMA_NORMAL;
hdma_sdio.Init.Priority = DMA_PRIORITY_LOW;
__HAL_LINKDMA( hsd,hdmarx,hdma_sdio);
HAL_DMA_Abort(&hdma_sdio);
HAL_DMA_DeInit(&hdma_sdio);
status = HAL_DMA_Init(&hdma_sdio);
return status;
}
HAL_StatusTypeDef SD_DMAConfigTX(SD_HandleTypeDef *hsd)
{
HAL_StatusTypeDef status = HAL_ERROR;
hdma_sdio.Instance = DMA2_Channel4;
hdma_sdio.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_sdio.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdio.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdio.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdio.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdio.Init.Mode = DMA_NORMAL;
hdma_sdio.Init.Priority = DMA_PRIORITY_LOW;
__HAL_LINKDMA( hsd,hdmarx,hdma_sdio);
HAL_DMA_Abort(&hdma_sdio);
HAL_DMA_DeInit(&hdma_sdio);
status = HAL_DMA_Init(&hdma_sdio);
return status;
}
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