SD card with 4-pin SSI

Hello Thomas,

Please have a look at the DK-TM4C129 Development Kit and the following example code

C:\ti\TivaWare_C_Series-2.1.0.12573\examples\boards\dk-tm4c129x\sd_card

Regards
Amit

Hello Amit,
unfortunately, the DK-TMC129 has a microSD header, which is not compatible to the SD transfer mode if I'm right.

Regards
Thomas

Hello Thomas,

The difference is in the form factor between the SD and uSD. Not the Transfer type.

Regards
Amit

You are right in this way. But I don't know how to connect the card to make it work in the SD mode. All examples just use the SPI mode. I want to establish high data rates.

Hello Thomas,

In SD Mode I would suggest using the GPIO as the control interface to bit bang the IO's for SD protocol

Regards
Amit

Hi,

Please see the file (add it to your project) Tiva/third_party/fatfs/port/mmc-dk-tm4c129x.c - this contains all initialisations needed - started in function void power_on (void) where the SSIFSS is configured as GPIO as suggested by Amit and the frequency is set to 400KHz, standard for SD. The next function void set_max_speed(void) sets the speed at 12.5MHz. These are local functions. 

Note you don't need to call these functions directly, they are called from mount()....dig a little bit into, not big pain.

Petrei