Posted on April 21, 2015 at 17:47
I use PC8, PC12 and PD2, this is ok. I have PU resistor on CMD and D0 lines
I test this code:
/* Includes ------------------------------------------------------------------*/
#include ''stm32f4xx_hal.h''
#include ''stm32f4xx_hal_sd.h''
#include ''sdio.h''
#include ''gpio.h''
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static uint32_t buf[512*4];
int main(void)
{
HAL_SD_ErrorTypedef err;
uint32_t cnt=0;
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_SDIO_SD_Init();
while (1)
{
cnt++;
err = HAL_SD_ReadBlocks(&hsd, buf, 0, 512, 4);
if(err!=SD_OK)
{
cnt=0;
MX_SDIO_SD_Init();
}
}
}
with it I found a problem on HAL_SD_Init, las line on this function is
SDIO_Init(hsd->Instance, hsd->Init);
return errorstate;
and with this instruction ClockDiv has 0x00 so the SDIO frequency goes to 24MHz and HAL_SD_ReadBlocks have random errors.
I fix it with this:
/* Configure SDIO peripheral interface */
hsd->Init.ClockDiv = 0x76;
SDIO_Init(hsd->Instance, hsd->Init);
return errorstate;
}
This way I have 400Khz and HAL_SD_ReadBlocks run ok. I test with 2MHz, 5MHz and 10MHz and everithing is ok, ReadBlocks run right. When I test with 12MHz or more I start to got problems. So, I think the harware is ok (for 10MHz) and I could implement FatFs.
Is there another test to check that HW is Ok?
Regards!
