can't get fatfs work on sdk 15.3

[zzzh]

Hello,

I was trying to make fatfs example work on my nrf52_pca10040 board, but it always fail to init (<info> app: Disk initialization failed.)

I'm using a 4GB sd card, seems it's supposed to be formatted by 512 bytes block, how to do that? ( it's in 64kB block now, formatted on windows, which don't have another option for FAT file system.)

[zzzh]

**************************************************************************************************

// <o> NRF_SPI_DRV_MISO_PULLUP_CFG - MISO PIN pull-up configuration.

// <0=> NRF_GPIO_PIN_NOPULL
// <1=> NRF_GPIO_PIN_PULLDOWN
// <3=> NRF_GPIO_PIN_PULLUP

#ifndef NRF_SPI_DRV_MISO_PULLUP_CFG
#define NRF_SPI_DRV_MISO_PULLUP_CFG 1
#endif

***************************************************************************************************

I noticed some talk about MISO PIN pull-up configuration, it's set to NRF_GPIO_PIN_PULLDOWN in sdk 15.3, as listed above.

I tried to change it to NOPULL, still don't work

[Susheel Nuguru]

Haven't tested this example myself but in the app_sdcard.h file I can see 

#define SDC_SECTOR_SIZE             512     ///< Size of a single SD card block in bytes.

Seems like you could change this to fit the block size of your SD card.

[zzzh]

Hi,

I checked the sd card with gparted, turns out it's sector size is 512 bytes, so there's no problem here.

I traced the code in debug, it's from a SDC_EVT_INIT event that sdc_hadler receive, which have a result of SDC_ERROR_NOT_RESPONDING.

I need to fighue out where does the event come from, any ideas?

[Susheel Nuguru]

It seems that your SD card is not responding to the commands sent to it. You need to set your pins to the logic analyzer and see the last transaction on SPI to understand which commands the SD card did not respond to. These has mostly SD card vendor specific timings.