RM57 SD card read/write

Young Kim1

Prodigy 200 points

Other Parts Discussed in Thread: HALCOGEN

Hi, I got 4GB sandisk micro SD card to try. This is a part of benchmark test.

What's the quick way to do read/write?

What I did so far is enable SPI1 and SPI2 drivers with HalCoGen.

Call spi_Init() at startup.

and modified RM48 connectivity code like this

void SD_Init()

{

IOMM_UNLOCK();

/* Set muxing for MibSPI2 - Is this correct????? */
/*(int *) 0xFFFF1C84 = 0x01010102;

/* Lock pinmux registers */
IOMM_LOCK();

/* Initialize and enable the Flash Card. */
uint32_t i,r1;

/* Initialize SPI interface and enable Flash Card SPI mode. */
SPI_ssel (1);
SPI_hiSpeed (0);

/* Send SPI Command with card not selected at 400 KBit. */
for (i = 0; i < 16; i++) {
r1 = SPI_send (0xFF);
}

/* Reset the card, send CMD0. */
SPI_ssel (0);

r1 = mmc_command (GO_IDLE_STATE, 0);
for (i = 0; i < 100; i++) {
if (r1 == 0x01) {
break;
}
r1 = SPI_send (0xFF);
}
SPI_ssel (1);
if (r1 != 0x01) {
/* Failed to Reset Flash Card. */
return (0);
}

I got stuck at "Failed to Reset Flash card".

Any ideas?

-Young

over 11 years ago

0 Chuck Davenport over 11 years ago

TI__Guru 59540 points

Hello Young,

We have this same question previously here:

http://e2e.ti.com/support/microcontrollers/hercules/f/312/t/320518.aspx

To summarize, the code included in the HDK connectivity package does not support SD cards greater than 2GB.

0 Young Kim1 over 11 years ago in reply to Chuck Davenport

Prodigy 200 points

Hi, Chuck.

Thanks for your reply. I saw that thread. It was very helpful.

I am afraid that I didn't ask the right question.

The thread that you pointed me was for RM48 and using less than 2GB SD card.

However, we are planning to use 4GB SDHC card on RM57.

How do I know I can access SD card with RM 57 HDK without purchasing a SD card that we won't use?

Does anyone know how to make this work?

0 Chuck Davenport over 11 years ago in reply to Young Kim1

TI__Guru 59540 points

Hello Young,

Thanks for the clarification. Unfortunately, I don't have a lot of experience with SD card protocols and I can't state what/where the limitations are for the 4G vs 2G cards in relation to the microcontrollers. I will forward the thread to one of our applications engineers that has done some work with the SD cards so he can add his insight and experience.

0 Wonjae Kim over 11 years ago

Expert 1075 points

Hi young.

There is a little difference in SDSD(under 2GB) and SDHC(2~32GB)

These links are helpful to you.

http://elm-chan.org/docs/mmc/gx1/sdinit.png

http://elm-chan.org/docs/mmc/mmc_e.html

Regards

Wonjae

0 Young Kim1 over 11 years ago in reply to Wonjae Kim

Prodigy 200 points

Thank you, Wonjae.

I think I need help from TI because I am stuck on "reset" with SPI mode.

I am wondering HalCoGen didn't produce the right spi_init().

-Young

0 Chuck Davenport over 11 years ago in reply to Young Kim1

TI__Guru 59540 points

Hello Young,

The individual I forwarded you questions to was out of the office last week and was not able to get to your question. I have sent him a personal note to ask that he have a look. He should get back with you sometime tomorrow.

0 QJ Wang over 11 years ago in reply to Chuck Davenport

TI__Guru**** 196306 points

Hi Young,

Enclosed is a simple SD card demo on RM48 HDK. This CCS project also includes a simple FS.

Regards,

QJ3755.RM48 HDK RevE SDCard Demo.zip

0 Young Kim1 over 11 years ago in reply to QJ Wang

Prodigy 200 points

Thank you both QJ Wang and Chuck~

The demo code will help me to investigate a lot!

Just looked at the code briefly, but there's no SD card initialization code.

Is that unnecessary?

Also, RM 57 is quite different than 48.

Therefore, the demo won't work as is. Is this a correct statement?

I will try to modify QJ's RM48 demo and let you know what happens.

Thanks again~

-Young

0 Young Kim1 over 10 years ago in reply to QJ Wang

Prodigy 200 points

HI, Wang.

I finally had time and tried this demo on RM57 HDK.

The code doesn't pass disk_initialize because send_cmd always exit before sending commands.

rcvr_spi() returns zero always. I looked at Rx Buf and it returns zero (after Rx-full interrupt flat is set).

I couldn't find a smaller micro SD card so I partitioned 8 GB to 1.7 GB and formatted to FAT.

Do you think that is the problem?

Thanks~

-Young

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RM57 SD card read/write