ST这骚操作，解决H7的SDIO DMA的4字节对齐问题，搞了个复制粘贴

eric2013 · 发表于 2020-9-22 13:34:20

其实H7自带了个SDIO DMA后，远没有使用通用DMA方便了，通用DMA可以轻松解决4字节对齐问题。

问题由来：

STM32H7的SDIO自带的DMA控制器数据传输的地址是强制4字节对齐，这就非常不方便了
http://www.armbbs.cn/forum.php?m ... id=94066&fromuid=58
(出处: 硬汉嵌入式论坛)

解决方法，如下代码，搞了个memcpy的骚操作，而且是512字节为单位的复制粘贴，SDIO批量块传输特性将发挥不出来：

/**
******************************************************************************
* @file sd_diskio_dma_template.c
* @author MCD Application Team
* @brief SD DMA Disk I/O template driver. This file needs to be renamed and
copied into the application project alongside the respective header
file.
******************************************************************************
* @attention
*
* Copyright (c) 2019 STMicroelectronics. All rights reserved.
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
**/
/* Includes ------------------------------------------------------------------*/
#include <string.h>
#include "ff_gen_drv.h"
#include "sd_diskio_dma.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/*
* the following Timeout is useful to give the control back to the applications
* in case of errors in either BSP_SD_ReadCpltCallback() or BSP_SD_WriteCpltCallback()
* the value by default is as defined in the BSP platform driver otherwise 30 secs
*/
#define SD_TIMEOUT 30 * 1000
#define SD_DEFAULT_BLOCK_SIZE 512
/*
* Depending on the usecase, the SD card initialization could be done at the
* application level, if it is the case define the flag below to disable
* the BSP_SD_Init() call in the SD_Initialize().
*/
/* #define DISABLE_SD_INIT */
/*
* when using cachable memory region, it may be needed to maintain the cache
* validity. Enable the define below to activate a cache maintenance at each
* read and write operation.
* Notice: This is applicable only for cortex M7 based platform.
*/
/* #define ENABLE_SD_DMA_CACHE_MAINTENANCE 1 */
/*
* Some DMA requires 4-Byte aligned address buffer to correctly read/wite data,
* in FatFs some accesses aren't thus we need a 4-byte aligned scratch buffer to correctly
* transfer data
*/
/* #define ENABLE_SCRATCH_BUFFER */
/* Private variables ---------------------------------------------------------*/
#if defined(ENABLE_SCRATCH_BUFFER)
#if defined (ENABLE_SD_DMA_CACHE_MAINTENANCE)
ALIGN_32BYTES(static uint8_t scratch[BLOCKSIZE]); // 32-Byte aligned for cache maintenance
#else
__ALIGN_BEGIN static uint8_t scratch[BLOCKSIZE] __ALIGN_END;
#endif
#endif
/* Disk status */
static volatile DSTATUS Stat = STA_NOINIT;
static volatile UINT WriteStatus = 0, ReadStatus = 0;
/* Private function prototypes -----------------------------------------------*/
static DSTATUS SD_CheckStatus(BYTE lun);
DSTATUS SD_initialize (BYTE);
DSTATUS SD_status (BYTE);
DRESULT SD_read (BYTE, BYTE*, DWORD, UINT);
#if _USE_WRITE == 1
DRESULT SD_write (BYTE, const BYTE*, DWORD, UINT);
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
DRESULT SD_ioctl (BYTE, BYTE, void*);
#endif /* _USE_IOCTL == 1 */
const Diskio_drvTypeDef SD_Driver =
{
SD_initialize,
SD_status,
SD_read,
#if _USE_WRITE == 1
SD_write,
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
SD_ioctl,
#endif /* _USE_IOCTL == 1 */
};
/* Private functions ---------------------------------------------------------*/
static int SD_CheckStatusWithTimeout(uint32_t timeout)
{
uint32_t timer = HAL_GetTick();
/* block until SDIO IP is ready again or a timeout occur */
while(HAL_GetTick() - timer < timeout)
{
if (BSP_SD_GetCardState() == SD_TRANSFER_OK)
{
return 0;
}
}
return -1;
}
static DSTATUS SD_CheckStatus(BYTE lun)
{
Stat = STA_NOINIT;
if(BSP_SD_GetCardState() == MSD_OK)
{
Stat &= ~STA_NOINIT;
}
return Stat;
}
/**
* @brief Initializes a Drive
* @param lun : not used
* @retval DSTATUS: Operation status
*/
DSTATUS SD_initialize(BYTE lun)
{
#if !defined(DISABLE_SD_INIT)
if(BSP_SD_Init() == MSD_OK)
{
Stat = SD_CheckStatus(lun);
}
#else
Stat = SD_CheckStatus(lun);
#endif
return Stat;
}
/**
* @brief Gets Disk Status
* @param lun : not used
* @retval DSTATUS: Operation status
*/
DSTATUS SD_status(BYTE lun)
{
return SD_CheckStatus(lun);
}
/**
* @brief Reads Sector(s)
* @param lun : not used
* @param *buff: Data buffer to store read data
* @param sector: Sector address (LBA)
* @param count: Number of sectors to read (1..128)
* @retval DRESULT: Operation result
*/
DRESULT SD_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)
{
DRESULT res = RES_ERROR;
uint32_t timeout;
#if defined(ENABLE_SCRATCH_BUFFER)
uint8_t ret;
#endif
#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)
uint32_t alignedAddr;
#endif
/*
* ensure the SDCard is ready for a new operation
*/
if (SD_CheckStatusWithTimeout(SD_TIMEOUT) < 0)
{
return res;
}
#if defined(ENABLE_SCRATCH_BUFFER)
if (!((uint32_t)buff & 0x3))
{
#endif
if(BSP_SD_ReadBlocks_DMA((uint32_t*)buff,
(uint32_t) (sector),
count) == MSD_OK)
{
ReadStatus = 0;
/* Wait that the reading process is completed or a timeout occurs */
timeout = HAL_GetTick();
while((ReadStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))
{
}
/* incase of a timeout return error */
if (ReadStatus == 0)
{
res = RES_ERROR;
}
else
{
ReadStatus = 0;
timeout = HAL_GetTick();
while((HAL_GetTick() - timeout) < SD_TIMEOUT)
{
if (BSP_SD_GetCardState() == SD_TRANSFER_OK)
{
res = RES_OK;
#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)
/*
the SCB_InvalidateDCache_by_Addr() requires a 32-Byte aligned address,
adjust the address and the D-Cache size to invalidate accordingly.
*/
alignedAddr = (uint32_t)buff & ~0x1F;
SCB_InvalidateDCache_by_Addr((uint32_t*)alignedAddr, count*BLOCKSIZE + ((uint32_t)buff - alignedAddr));
#endif
break;
}
}
}
}
#if defined(ENABLE_SCRATCH_BUFFER)
}
else
{
/* Slow path, fetch each sector a part and memcpy to destination buffer */
int i;
for (i = 0; i < count; i++) {
ret = BSP_SD_ReadBlocks_DMA((uint32_t*)scratch, (uint32_t)sector++, 1);
if (ret == MSD_OK) {
/* wait until the read is successful or a timeout occurs */
timeout = HAL_GetTick();
while((ReadStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))
{
}
if (ReadStatus == 0)
{
res = RES_ERROR;
break;
}
ReadStatus = 0;
#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)
/*
*
* invalidate the scratch buffer before the next read to get the actual data instead of the cached one
*/
SCB_InvalidateDCache_by_Addr((uint32_t*)scratch, BLOCKSIZE);
#endif
memcpy(buff, scratch, BLOCKSIZE);
buff += BLOCKSIZE;
}
else
{
break;
}
}
if ((i == count) && (ret == MSD_OK))
res = RES_OK;
}
#endif
return res;
}
/**
* @brief Writes Sector(s)
* @param lun : not used
* @param *buff: Data to be written
* @param sector: Sector address (LBA)
* @param count: Number of sectors to write (1..128)
* @retval DRESULT: Operation result
*/
#if _USE_WRITE == 1
DRESULT SD_write(BYTE lun, const BYTE *buff, DWORD sector, UINT count)
{
DRESULT res = RES_ERROR;
uint32_t timeout;
#if defined(ENABLE_SCRATCH_BUFFER)
uint8_t ret;
int i;
#endif
WriteStatus = 0;
#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)
uint32_t alignedAddr;
#endif
if (SD_CheckStatusWithTimeout(SD_TIMEOUT) < 0)
{
return res;
}
#if defined(ENABLE_SCRATCH_BUFFER)
if (!((uint32_t)buff & 0x3))
{
#endif
#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)
/*
the SCB_CleanDCache_by_Addr() requires a 32-Byte aligned address
adjust the address and the D-Cache size to clean accordingly.
*/
alignedAddr = (uint32_t)buff & ~0x1F;
SCB_CleanDCache_by_Addr((uint32_t*)alignedAddr, count*BLOCKSIZE + ((uint32_t)buff - alignedAddr));
#endif
if(BSP_SD_WriteBlocks_DMA((uint32_t*)buff,
(uint32_t)(sector),
count) == MSD_OK)
{
/* Wait that writing process is completed or a timeout occurs */
timeout = HAL_GetTick();
while((WriteStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))
{
}
/* incase of a timeout return error */
if (WriteStatus == 0)
{
res = RES_ERROR;
}
else
{
WriteStatus = 0;
timeout = HAL_GetTick();
while((HAL_GetTick() - timeout) < SD_TIMEOUT)
{
if (BSP_SD_GetCardState() == SD_TRANSFER_OK)
{
res = RES_OK;
break;
}
}
}
}
#if defined(ENABLE_SCRATCH_BUFFER)
}
else
{
/* Slow path, fetch each sector a part and memcpy to destination buffer */
#if (ENABLE_SD_DMA_CACHE_MAINTENANCE == 1)
/*
* invalidate the scratch buffer before the next write to get the actual data instead of the cached one
*/
SCB_InvalidateDCache_by_Addr((uint32_t*)scratch, BLOCKSIZE);
#endif
for (i = 0; i < count; i++)
{
WriteStatus = 0;
memcpy((void *)scratch, (void *)buff, BLOCKSIZE);
buff += BLOCKSIZE;
ret = BSP_SD_WriteBlocks_DMA((uint32_t*)scratch, (uint32_t)sector++, 1);
if (ret == MSD_OK) {
/* wait for a message from the queue or a timeout */
timeout = HAL_GetTick();
while((WriteStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))
{
}
if (WriteStatus == 0)
{
break;
}
}
else
{
break;
}
}
if ((i == count) && (ret == MSD_OK))
res = RES_OK;
}
#endif
return res;
}
#endif /* _USE_WRITE == 1 */
/**
* @brief I/O control operation
* @param lun : not used
* @param cmd: Control code
* @param *buff: Buffer to send/receive control data
* @retval DRESULT: Operation result
*/
#if _USE_IOCTL == 1
DRESULT SD_ioctl(BYTE lun, BYTE cmd, void *buff)
{
DRESULT res = RES_ERROR;
BSP_SD_CardInfo CardInfo;
if (Stat & STA_NOINIT) return RES_NOTRDY;
switch (cmd)
{
/* Make sure that no pending write process */
case CTRL_SYNC :
res = RES_OK;
break;
/* Get number of sectors on the disk (DWORD) */
case GET_SECTOR_COUNT :
BSP_SD_GetCardInfo(&CardInfo);
*(DWORD*)buff = CardInfo.LogBlockNbr;
res = RES_OK;
break;
/* Get R/W sector size (WORD) */
case GET_SECTOR_SIZE :
BSP_SD_GetCardInfo(&CardInfo);
*(WORD*)buff = CardInfo.LogBlockSize;
res = RES_OK;
break;
/* Get erase block size in unit of sector (DWORD) */
case GET_BLOCK_SIZE :
BSP_SD_GetCardInfo(&CardInfo);
*(DWORD*)buff = CardInfo.LogBlockSize / SD_DEFAULT_BLOCK_SIZE;
res = RES_OK;
break;
default:
res = RES_PARERR;
}
return res;
}
#endif /* _USE_IOCTL == 1 */
/**
* @brief Tx Transfer completed callbacks
* @param hsd: SD handle
* @retval None
*/
/*
===============================================================================
Select the correct function signature depending on your platform.
please refer to the file "stm32xxxx_eval_sd.h" to verify the correct function
prototype
===============================================================================
*/
//void BSP_SD_WriteCpltCallback(uint32_t SdCard)
void BSP_SD_WriteCpltCallback(void)
{
WriteStatus = 1;
}
/**
* @brief Rx Transfer completed callbacks
* @param hsd: SD handle
* @retval None
*/
/*
===============================================================================
Select the correct function signature depending on your platform.
please refer to the file "stm32xxxx_eval_sd.h" to verify the correct function
prototype
===============================================================================
*/
//void BSP_SD_ReadCpltCallback(uint32_t SdCard)
void BSP_SD_ReadCpltCallback(void)
{
ReadStatus = 1;
}
/*
==============================================================================================
depending on the SD_HAL_Driver version, either the HAL_SD_ErrorCallback() or HAL_SD_AbortCallback()
or both could be defined, activate the callbacks below when suitable and needed
==============================================================================================
void BSP_SD_AbortCallback(void)
{
}
void BSP_SD_ErrorCallback(void)
{
}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

复制代码

eric2013 · 发表于 2020-9-22 13:43:40

现在想想知道为什么使用SDIO自带DMA，因为通用的DMA性能不行，无法满足H7的SDMMC超高速模式

STM32H7的SDIO外接支持UHS-I 模式 (SDR12, SDR25, SDR50, SDR104和DDR50)需要1.8的电平转换器
http://www.armbbs.cn/forum.php?m ... id=89590&fromuid=58
(出处: 硬汉嵌入式论坛)

通用DMA性能：

STM32H7的SDIO外接支持UHS-I 模式 (SDR12, SDR25, SDR50, SDR104和DDR50)需要1.8的电平转换器
http://www.armbbs.cn/forum.php?m ... id=89590&fromuid=58
(出处: 硬汉嵌入式论坛)

hpdell · 发表于 2020-9-22 17:12:16

eric2013 · 发表于 2020-9-23 01:52:12

实际测试，官方提供的这种方式，性能略挫。

终极菜鸟 · 发表于 2020-12-10 09:55:11

通用DMA 怎么做。有没有例子。

eric2013 · 发表于 2020-12-10 10:34:27

终极菜鸟发表于 2020-12-10 09:55
通用DMA 怎么做。有没有例子。

没有用通用DMA做，用的SDIO自带的专用DMA

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[SD/SDIO] ST这骚操作，解决H7的SDIO DMA的4字节对齐问题，搞了个复制粘贴