SPI communication method of nrf 52832 and SD card.

RE: SPI communication method of nrf 52832 and SD card.

y001 — Thu, 06 Sep 2018 05:36:22 GMT

I was able to execure fatfs by changing CS from HIGH to LOW!

Thank you for your cooperation!

RE: SPI communication method of nrf 52832 and SD card.

Jørgen Holmefjord — Thu, 30 Aug 2018 09:29:01 GMT

The FatFS example will put the SD card in SPI mode. The card is put in SPI mode by pulling the CS/CD pin low. Please read more in footnote 3 of chapter 3.7.1 in SD Association Part1 Physical Layer Simplified Specification Ver6.00.

RE: SPI communication method of nrf 52832 and SD card.

y001 — Thu, 30 Aug 2018 07:01:47 GMT

Thank you

I found out thea using fatfs makes it possible to write to a file, but I do not know how to put the SD card in SPI mode.

Do you know what to do?

RE: SPI communication method of nrf 52832 and SD card.

Jakub Rzeszutko — Thu, 30 Aug 2018 06:57:08 GMT

Example is intended to create a file: NORDIC.TXT
Within this file you shall see text "SD card example."

Update:

Some SD cards requires different pull up configuration on MISO line. You can modify it in the sdk_config.h file: NRF_SPI_DRV_MISO_PULLUP_CFG

RE: SPI communication method of nrf 52832 and SD card.

y001 — Thu, 30 Aug 2018 06:44:10 GMT

HI,

thank you for your reply!

nRF5_SDK_15.0.0_a53641a/examples/peripheral/fatfs is referred to.

On the first row

#define SDC_SCK_PIN     2   ///< SDC serial clock (SCK) pin.
#define SDC_MOSI_PIN    29 ///< SDC serial data in (DI) pin.
#define SDC_MISO_PIN    30 ///< SDC serial data out (DO) pin.
#define SDC_CS_PIN      28 ///< SDC chip select (CS) pin.

If you change the pin number and use it, a file is created and added to a text file.

#define TEST_STRING "SD card example."

Will characters weitten as defined in are written ?

Are there other parts to change?

RE: SPI communication method of nrf 52832 and SD card.

Jakub Rzeszutko — Thu, 30 Aug 2018 06:23:36 GMT

Hi,

Did you check an example provided in the SDK?

\sdk\nrf5\examples\peripheral\fatfs