RE: looking for a sample, to have writing a file onto the SD-CARD, that a PC will understand

TF mulder — Fri, 25 Feb 2022 10:47:41 GMT

Hi Jorgen,

Thanks for the pointers.

I indeed have it working now :-)

Best Regards,

Theo

RE: looking for a sample, to have writing a file onto the SD-CARD, that a PC will understand

Jørgen Holmefjord — Thu, 24 Feb 2022 10:03:02 GMT

Hi,

You should be able to use a similar approach as the FatFS example in nRF5 SDK uses to write a text file to the SD-card:

#define FILE_NAME   "NORDIC.TXT"
#define TEST_STRING "SD card example."

...

ff_result = f_open(&file, FILE_NAME, FA_READ | FA_WRITE | FA_OPEN_APPEND);
if (ff_result != FR_OK)
{
	NRF_LOG_INFO("Unable to open or create file: " FILE_NAME ".");
	return;
}

ff_result = f_write(&file, TEST_STRING, sizeof(TEST_STRING) - 1, (UINT *) &bytes_written);
if (ff_result != FR_OK)
{
	NRF_LOG_INFO("Write failed\r\n.");
}
else
{
	NRF_LOG_INFO("%d bytes written.", bytes_written);
}

(void) f_close(&file);

Note that Zephyr provides a common FS API for the different file systems, so you should replace "f_" with "fs_", and replace the return code checks with the corresponding Zephyr error codes.

Best regards,
Jørgen