sd card example not working fine

RE: sd card example not working fine

Goose — Tue, 08 Oct 2019 18:32:53 GMT

Hi there, I also experienced issues with the SD card.

This worked for me:

- Set all pins to PULLUP or NOPULL

- Place a 20K resistor between 3.3V and MISO (basically an external pullup)

I also experienced a problem where if I have certain NRF pins set as one of the SD pins, the SD example would freeze and not proceed past a certain point, even with nothing connected to the board. (Example being setting P0.09 to SD SPI CLK will freeze, but changing to P0.20 works even though nothing is connected to the board. (This appears to be an SDK bug)

RE: sd card example not working fine

Jørgen Holmefjord — Tue, 08 Oct 2019 08:22:49 GMT

Have you double-checked the connections to the SD card? I have tested this example multiple times with different SD cards and have not experienced issues when the connections are correct. Please also test with different SD cards and sockets if you have made sure everything else is correct.

If nothing of this helps, please post a new case where you describe your issue in detail, along with all debugging steps you have tried.

RE: sd card example not working fine

NickH — Mon, 07 Oct 2019 16:12:46 GMT

I also checked the SD card is formatted OK (MS-DOS (FAT16)) and that I can write to it via PC.

I have two SD cards and get the same error with both and they take 3.3v not 5v.

RE: sd card example not working fine

NickH — Mon, 07 Oct 2019 15:32:22 GMT

I am having the same issue using SDK 15.3 and Segger IDE with the fatfs example on pca10040 and nrf52 dk.

I get "Disk initialization failed" as the

m_drives[drv].config.wait_func = default_wait_func;

Returns

m_drives[drv].config.last_result == NRF_BLOCK_DEV_RESULT_IO_ERROR

I have tried the setting APP_SDCARD_FREQ_DATA and APP_SDCARD_FREQ_INIT to lower frequencies and also setting the NRF_SPI_DRV_MISO_PULLUP_CFG to NRF_GPIO_PIN_NOPULL but I still get the same error.

I'm also pretty sure the VDD is the right way around as an LED lights up on the SD board (mikroBUS microSD click).

Any pointers on what else to try gratefully received...

Nick

RE: sd card example not working fine

Jakub Rzeszutko — Tue, 24 Oct 2017 07:55:31 GMT

This bug is known and has been corrected in SDK13 documentation.

RE: sd card example not working fine

Peter_E — Tue, 24 Oct 2017 06:44:43 GMT

This table still shows wrong GND and VCC connection:

infocenter.nordicsemi.com/index.jsp

Pin3 should be GND, Pin4 is VCC

RE: sd card example not working fine

Peter_E — Tue, 24 Oct 2017 06:26:30 GMT

Ok, changed NRF_SPI_DRV_MISO_PULLUP_CFG to NRF_GPIO_PIN_NOPULL and it works. Thank you.

RE: sd card example not working fine

Jakub Rzeszutko — Mon, 23 Oct 2017 13:37:33 GMT

There were changes in SPI MISO Pulldown settings between SDK13 and SDK14. I guess this is the reason you are not able to communicate with the SD card. Please try to change SDK config parameter as I suggested.

RE: sd card example not working fine

Jakub Rzeszutko — Mon, 23 Oct 2017 13:14:20 GMT

Did you try to change MISO pull-up?

It is SDK config please set parameter: NRF_SPI_DRV_MISO_PULLUP_CFG to NRF_GPIO_PIN_NOPULL.

RE: sd card example not working fine

Peter_E — Mon, 23 Oct 2017 12:13:42 GMT

I seems that the problem is not hardware related. I tried the fatfs example with SDK 12.3 and Keil, this configuration works, whereas SDK 14.1 with Segger Embedded Studio fails.

RE: sd card example not working fine

kl-cruz — Mon, 16 Oct 2017 09:55:18 GMT

Well... Try slower ones. If You have good but long connections I think You should try with 125kHz or 250kHz in command and data config. Then try to increase data config freq, up to frequency when communication will be broken. In case of any problem double check connections. Cables have to be well-connected

RE: sd card example not working fine

YASH — Mon, 16 Oct 2017 09:49:46 GMT

Ok Thanks. what frequency should i set it as?

RE: sd card example not working fine

kl-cruz — Mon, 16 Oct 2017 09:37:39 GMT

Try to find

APP_SDCARD_FREQ_DATA

and

APP_SDCARD_FREQ_INIT

in:

examples\peripheral\fatfs\pca10040\blank\config\sdk_config.h file. It is well described how to set proper values.

RE: sd card example not working fine

YASH — Mon, 16 Oct 2017 09:29:38 GMT

How should i do that?

RE: sd card example not working fine

YASH — Mon, 16 Oct 2017 09:27:38 GMT

Hello, the connections are according to this documentation that you shared. Is there any other way to get the solution out of it?

RE: sd card example not working fine

kl-cruz — Mon, 16 Oct 2017 09:23:44 GMT

You can also try to slow down SPI frequency a little

RE: sd card example not working fine

Jakub Rzeszutko — Mon, 16 Oct 2017 08:53:05 GMT

Please double check your connection as there is a bug in SDK12.2 docummentation for SD card example. VDD and GND are switched in the table. Here you can find correct connection settings:

infocenter.nordicsemi.com/.../app_sdcard_example.html

The other problem might be with MISO PULLUP settings. In SDK <= 13 it was set to "no pullup", beginning from SDK_14 by default MISO is set to pulldown. This can cause problem for some SD cards. In order to fix it try to change SDK config parameter: NRF_SPI_DRV_MISO_PULLUP_CFG to NRF_GPIO_PIN_NOPULL.