Hi ST communities,
My hardware is MCU STM32F756, eMMC mtfc2gmdea-0m 4bit 24MHZ CLK.
FATFS: R0.12C.
STM32F7_Cube_FW_Ver：STM32Cube_FW_F7_V1.15.0.
Why does eMMC now write data at only 585KB/S.
FATFS_WR_SIZE 8192, every time to writes 1024Bytes.
uint8_t wtext[FATFS_WR_SIZE];
void FATFS_Test(uint32_t count)
{
FRESULT res; /* FatFs function common result code */
uint32_t byteswritten; /* File write/read counts */ //bytesread
uint32_t wt,baktime;
uint16_t i;
for(i=0;i<FATFS_WR_SIZE;i+=8)
{
wtext[i]='T';
wtext[i+1]='e';
wtext[i+2]='s';
wtext[i+3]='t';
wtext[i+4]='!';
wtext[i+5]='!';
wtext[i+6]='!';
wtext[i+7]=' ';
}
wt=0;
baktime = wrtime;
UsbPrintf("baktime=%d,count=%d\r\n",baktime,count);
if(f_open(&MyFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)
{
/* 'STM32.TXT' file Open for write Error */
// Error_Handler();
}
else
{
/*##-5- Write data to the text file ################################*/
for(ii=0;ii<count;ii++)
{
res = f_write(&MyFile, wtext, FATFS_WR_SIZE, (void *)&byteswritten);
if(res)break;
if(wt!=wrtime)
{
wt=wrtime;
}
}
if(res==0)
{
wt=count*FATFS_WR_SIZE/1024/(wrtime-baktime);
UsbPrintf("FATFS eMMC speed：%dKB/s fileSize:%dKB wrtime=%d\r\n",wt,count*FATFS_WR_SIZE/1024,wrtime);
}
if((byteswritten == 0) || (res != FR_OK))
{
/* 'STM32.TXT' file Write or EOF Error */
// Error_Handler();
}
else
{
/*##-6- Close the open text file #################################*/
f_close(&MyFile);
}
}
}
