Question
FATFS + SDMMC, internal eMMC on STM32745I-DISCO doesn't work
I configured SDMMC1 as follows:
hmmc1.Instance = SDMMC1;
hmmc1.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
hmmc1.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
hmmc1.Init.BusWide = SDMMC_BUS_WIDE_8B;
hmmc1.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_DISABLE;
hmmc1.Init.ClockDiv = 1;Here's my FATFS configuration:
#define _FS_READONLY 0
#define _FS_MINIMIZE 0
#define _USE_STRFUNC 2
#define _USE_FIND 1
#define _USE_MKFS 1
#define _USE_FASTSEEK 1
#define _USE_EXPAND 1
#define _USE_CHMOD 1
#define _USE_LABEL 1
#define _USE_FORWARD 1
#define _CODE_PAGE 852
#define _USE_LFN 2
#define _MAX_LFN 255
#define _LFN_UNICODE 0
#define _STRF_ENCODE 3
#define _FS_RPATH 0
#define _VOLUMES 2
#define _STR_VOLUME_ID 0
#define _VOLUME_STRS "RAM","NAND","CF","SD1","SD2","USB1","USB2","USB3"
#define _MULTI_PARTITION 1
#define _MIN_SS 512
#define _MAX_SS 512
#define _USE_TRIM 1
#define _FS_NOFSINFO 0
#define _FS_TINY 1
#define _FS_EXFAT 1
#define _FS_NORTC 0
#define _NORTC_MON 6
#define _NORTC_MDA 4
#define _NORTC_YEAR 2015
#define _FS_LOCK 2
#define _FS_REENTRANT 1
#define _USE_MUTEX 1
#define _FS_TIMEOUT 1000
#define _SYNC_t osMutexId_tWhen I try to execute f_disk on the chip, i get F_DISK_ERR.
My test:
void formatMMC()
{
debug("Formatting MMC...");
osDelay(20);
static TCHAR workBuffer[_MIN_SS];
DWORD plist[] = { 100, 0 };
FRESULT fr = f_fdisk(retMMC, plist, workBuffer);
fr = f_mkfs(MMCPath, FM_ANY, 0, workBuffer, sizeof(workBuffer));
if (fr == FR_OK)
debug("eMMC formatted successfully.");
else
debug("ERROR: eMMC f_mkfs().");
}And here's the f_disk code until the line that fails:
FRESULT f_fdisk (
BYTE pdrv, /* Physical drive number */
const DWORD* szt, /* Pointer to the size table for each partitions */
void* work /* Pointer to the working buffer */
)
{
UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
DSTATUS stat;
DWORD sz_disk, sz_part, s_part;
stat = disk_initialize(pdrv);
if (stat & STA_NOINIT) return FR_NOT_READY;
if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;As you can see, GET_SECTOR_COUNT fails.
But anyway, I try to use just f_mkfs and...
...
if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) return FR_DISK_ERR;Again, GET_SECTOR_COUNT fails.
Of course I tried to disable multi partition feature from FATFS. Doesn't help either.
I also tried using different clock dividers, from 0 to 8. For 0 and 8 initialization fails, for values from 1 to 7 it passes and the code fails as described.
UPDATE:
Multi partition feature disabled, I traced where exactly f_mkfs() fails. Here:
/* Get error state */
if (__HAL_MMC_GET_FLAG(hmmc, SDMMC_FLAG_DTIMEOUT))
{
/* Clear all the static flags */
__HAL_MMC_CLEAR_FLAG(hmmc, SDMMC_STATIC_FLAGS);
hmmc->ErrorCode |= HAL_MMC_ERROR_DATA_TIMEOUT;
hmmc->State = HAL_MMC_STATE_READY;
return HAL_ERROR;
}
else if (__HAL_MMC_GET_FLAG(hmmc, SDMMC_FLAG_DCRCFAIL))
{
/* Clear all the static flags */
__HAL_MMC_CLEAR_FLAG(hmmc, SDMMC_STATIC_FLAGS);
hmmc->ErrorCode |= HAL_MMC_ERROR_DATA_CRC_FAIL;
hmmc->State = HAL_MMC_STATE_READY;
return HAL_ERROR;
}
else if (__HAL_MMC_GET_FLAG(hmmc, SDMMC_FLAG_TXUNDERR))
{
/* Clear all the static flags */
__HAL_MMC_CLEAR_FLAG(hmmc, SDMMC_STATIC_FLAGS);
hmmc->ErrorCode |= HAL_MMC_ERROR_TX_UNDERRUN;
hmmc->State = HAL_MMC_STATE_READY;
return HAL_ERROR;
}It's stm32h7xx_hal_mmc.c file.
But why it that?
What else can I do?