Problem with FATFS(sdcard) example program

[sree]

Hi 

   i am new with nRF52832. i am trying to run fatfs example program. But it shows Disk initialization failed. what is the reason for it?.

i am using segger embedded studio.

[HasanYilmaz]

1- Nordic\nRF5_SDK_15.3.0_59ac345\examples\peripheral\fatfs\pca10040\blank\ses

2-https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v12.2.0%2Fapp_sdcard_example.html&cp=4_0_3_4_5_30

#define SDC_SCK_PIN      25 ///< SDC serial clock (SCK) pin.
#define SDC_MOSI_PIN     23  ///< SDC serial data in (DI) pin.
#define SDC_MISO_PIN     24  ///< SDC serial data out (DO) pin.
#define SDC_CS_PIN       22  ///< SDC chip select (CS) pin.

3- Some sd card adapters do not work with 3.3 volts. Connect your adapter to 5V.