测试基于CubeMX生成的模板,想把USB数据转存到SD,可是将USB和SD连接到一起的速度太太低了。
这是我做的一些测试
测试条件:
STM32 F407 , hal, SDIO(24M), DMA
闪迪 16G Class10
USBHS(USB3300)(MSC)
WIN10,USB2.0/USB3.0
测试 一:
SD卡,多扇区连续访问(200k)
写:6.9MB/S
读:10.85MB/S
测试 二:
USB
写:10.6MB/S
读:14.4MB/S
测试 三:USB + SD
写:300KB/S
读:700KB/S
调试时,我把
STORAGE_Read_HS(uint8_t lun, uint8_t *buf,uint32_t blk_addr, uint16_t blk_len)
STORAGE_Write_HS(uint8_t lun, uint8_t *buf,uint32_t blk_addr, uint16_t blk_len)
blk_len参数仿真查看,发现每次数据通讯都为 1 扇区,数据长度(512字节),怀疑是此处的时间开销,没有真正发挥 SDIO,DMA连续数据访问的优势。大家有遇到这种情况的吗?
int8_t STORAGE_Init_HS(uint8_t lun)
{
/* USER CODE BEGIN 9 */
return (USBD_OK);
/* USER CODE END 9 */
}
/**
* @brief .
* @param lun: .
* @param block_num: .
* @param block_size: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_GetCapacity_HS(uint8_t lun, uint32_t *block_num, uint16_t *block_size)
{
/* USER CODE BEGIN 10 */
HAL_SD_CardInfoTypeDef pCardInfo;
HAL_SD_GetCardInfo(&hsd, &pCardInfo);
*block_num = pCardInfo.LogBlockNbr;
*block_size = pCardInfo.LogBlockSize;
return (USBD_OK);
/* USER CODE END 10 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_IsReady_HS(uint8_t lun)
{
/* USER CODE BEGIN 11 */
if(HAL_SD_GetCardState(&hsd) == HAL_SD_CARD_TRANSFER)
return (USBD_OK);
else
return (USBD_FAIL);
/* USER CODE END 11 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_IsWriteProtected_HS(uint8_t lun)
{
/* USER CODE BEGIN 12 */
return (USBD_OK);
/* USER CODE END 12 */
}
/**
* @brief .
* @param lun: .
* @param buf: .
* @param blk_addr: .
* @param blk_len: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Read_HS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
/* USER CODE BEGIN 13 */
int8_t ret = USBD_FAIL;
if( HAL_SD_ReadBlocks_DMA(&hsd, buf, blk_addr, blk_len) == HAL_OK )
{
ret = USBD_OK;
}
if( USBD_OK == ret )
{
while(HAL_SD_GetState(&hsd) == HAL_SD_STATE_BUSY){};
while( HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER ){};
}
return ret;
/* USER CODE END 13 */
}
/**
* @brief .
* @param lun: .
* @param buf: .
* @param blk_addr: .
* @param blk_len: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Write_HS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
/* USER CODE BEGIN 14 */
int8_t ret = USBD_FAIL;
if( HAL_SD_WriteBlocks_DMA(&hsd, buf, blk_addr, blk_len) == HAL_OK )
{
ret = USBD_OK;
}
if( USBD_OK == ret )
{
while(HAL_SD_GetState(&hsd) == HAL_SD_STATE_BUSY){};
while( HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER ){};
}
return ret;
/* USER CODE END 14 */
}
/**
* @brief .
* @param None
* @retval .
*/
int8_t STORAGE_GetMaxLun_HS(void)
{
/* USER CODE BEGIN 15 */
return (STORAGE_LUN_NBR - 1);
/* USER CODE END 15 */
} |