Interfacing SD/MMC Cards With TMS320F28xxx DSCs

Rahul

Other Parts Discussed in Thread: TMS320F28069

Hi all,

I'm trying to interface SD card with TMS320F28069... And refereed document and source code provided in the following link.

http://www.ti.com/apps/docs/litabsmultiplefilelist.tsp?literatureNumber=spraao7&docCategoryId=1&appId=270

Code is not getting out form this following while loop which is in 'sd_initialization' function.

while(response != IN_IDLE_STATE) //Wait until card responds with IDLE response
sd_command_response();

Your help will be very much great full to me!

PS: I tuned SPI clock but no use!

over 13 years ago

0 Tim Love over 13 years ago

TI__Expert 5340 points

Rahul SU,

Are you seeing the initial GO_IDLE_STATE being transmitted from the SPI? If you are seeing the command transmitted, then the next signal to look at is the chip select. At the beginning sd_initialization function you will see the command, CS_LOW. This is defined in SD.h for GPIO19. Are you using GPIO19 as your chip select to the SD Card? Because of timing required by the SD protocol, you must use a GPIO for the CS and not the built in SPISTE signal.

Regards,

Tim Love

0 Rahul over 13 years ago in reply to Tim Love

Expert 1770 points

Thanks Tim,

Tried your suggestions. I see data is being transmitted by SPI(In Debugging window). But still the same prob.

Here is pin config.

CS - GPIO19

CLK - GPIO26

DI - GPIO12

Do - GPIO13

Thanks,

Rahul

0 Tim Love over 13 years ago in reply to Rahul

TI__Expert 5340 points

Rahul,

It appears that you are using SPI-B. Did you change the project for SPI-B initialization? In the original app note example SPI-A is used. This corresponds to GPIO16, 17, and 18. You can see the initialization in the SPI.c file.

Regards,

Tim Love

0 Rahul over 13 years ago in reply to Tim Love

Expert 1770 points

Resolved!

Thank you....

0 Tim Love over 13 years ago in reply to Rahul

TI__Expert 5340 points

Rahul,

I am glad to hear this is working for you now.

Regards,

Tim Love

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Interfacing SD/MMC Cards With TMS320F28xxx DSCs