how to change USB SD-MSD SDHC to SPI mode

[sudhakarp]

Hi,

i am using FRDMK64 controller and KDS3.0 and KSDK1.3.0 example. i got USB SD-card mass storage device from KSDK example.straight way its working with SDHC protocol. but i want to implement with SPI pins.so how to modify code to USB SD-MSD  with  SPI mode. i saw configuration setting in example code

#if SD_CARD_APP

    #define USE_SDHC_PROTOCOL    (0)

    #define USE_SPI_PROTOCOL     (1)

#endif

i changed to SPI_PROTOCOL but its not working. i changed SD card pins connection to SPI pins also. i am sure with hardware connection.  can you give some idea..?

regards,

sudhakar p

[Carlos_Musich]

Hi Sudhakar,

The example you are using is prepared to add SPI support but it is not implemented yet.

As you can see in disc.c there macro USE_SPI_PROTOCOL is defined but not used. You need to implement each function of the driver and you may use this macro to build SPI functions of DSHC functions.

E.g.

#if USE_SPI_PROTOCOL

void spi_detect_io_init(void)

{

//this must be defined in disc.c by user

}

#else

void sdhc_detect_io_init(void)

{

//this code is already defined in disc.c...

}

#endif

Regards,

Carlos

[sudhakarp]

hi,

     and also i modified SD_Init() function related to SPI. i attached that code also.but its not working its hanging inside

SDSPI_DRV_Init(); function

if (kStatus_SDSPI_NoError != SDSPI_DRV_GoIdle(spi, card))

    {

        return kStatus_SDSPI_Failed;

    }

please can u find problem where i am doing mistake

thanks and regards,

sudhakar p !

[Carlos_Musich]

Hi Sudhakar,

I checked your disc.c file and I did not find the SPI initialization and I saw your edits in USB_App_Class_Callback to read and write using SPI but I did not see the SPI initialization.

Regards,

Carlos