SD card interfacing

Hi. Which SDK is this for interfacing SD card? I tried the one with SDK 10, but nothing worked out, I am getting error in the file nrf_spim.h where it says NRF_SPIM_TYPE is undefined. Please help fix this?

Hi All,

I just seen this post and it seems to be useful to me. I tried the earlier approach specified in above two library files using SPI. I interfaced NRF52 with SD card.

In first approach, I have tried with SD card and SDHC card. In both cases initialization failed massage came. I am using library files specified by Stanislav Silnitskiy .

I tried FATFS example to interface SD card with nrf52. It works fine . But for writing at high rate based on SAADC interrupt, I am getting some issues specified at this link

My code with fatfs is specified at above mentioned link.

Does any one has any idea why I am getting these issues and how Can resolve them?

Thanks a lot, the example is very helpful, everything works with the new libraies from SDK12.2.0.

Just mentioning that the newest SDK (12.2.0) has support for SD cards. I advise you to take a look at the SD card example here. If you have questions to the SD card library/example in the SDK, you can post a question on the forum and we will help you. The SD card library in the SDK is also based on FATFS.

Hi,

thanks a lot Kumar for sharing your code. I try to use the FatFs with your library on an nRF52 developer board to communicate over SPI with a SD Card.

But I'm facing some problems trying to write something in a text file on the SD Card. Initialzing the Card and create, open or read a text file works. But when I want to write in my text file the file stays empty. There is no error message in the return value of the f_write function but the f_close function returns FR_DISK_ERR. While debugging I see that in my code the Bytes I want to write in the File are even in the Buffer of the file variable. But when I read out the Card on my PC (with a text editor) the text file is still empty.

When I write something in my file from the PC and save it, the next time I try to write over SPI on the Card the Bytes that already exists are overwritten by the new values I want to write. But only the ones who already exist are overwritten and no additional Bytes. In this case the f_open function returns FR_OK.

Here's my code (I use the state variable only for debugging):

int main(void)
{

	BYTE data[512];
	FATFS FatFs;       /* FatFs work area needed for each volume */
	FIL Fil;           /* File object needed for each open file */


	UINT data_len = 64;
	UINT bw;
	uint8_t state=0;

	bleStackInit();
	APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);


	memset(data, 97, sizeof data);
        sd_spi_init();

	while(1)
	{
		
		f_mount(&FatFs, "", 0);  /* Give a work area to the default drive */

		/* Opens an existing file. If not exist, creates a new file. */
		if(f_open(&Fil, "logfile.txt", FA_WRITE| FA_READ | FA_OPEN_ALWAYS)!= FR_OK)
		{
			state= 4;
		}


		if(f_write(&Fil,data,data_len,&bw)!= FR_OK) //f_printf(&Fil, "%d", u)
		{
			state=2;
		}

		/* Close the file */
		 if(f_close(&Fil)!= FR_OK)
		 {
			 state=3;
		 }
		nrf_delay_ms(1000);

		if(state)
		{

		}
	}

}

I'm using a 32 GB Sd Card. I have no other slaves for this SPI than the Card that's why my CS (SS) Pin is set on ground.

I'm thankful for any advice.

Regards Lea