GPIO1 not accessible from GEL script

Lee Nipper

I'm using the DM814x_PG2.x.gel file with CCS 5.1.0.09000 to initialize a new dm814x based board design.
I've made a small modification to set up PINCNTL116 for an LED on our board.

When I attempt a write to the GPIO1 area to set the OE at address 0x4804C134, I get a CCS error:
CortexA8: Trouble Writing Memory Block at 0x4804c134 on Page 0 of Length 0x4

I'm wondering if the clocking setup for GPIO at reset is enough for the GPIO module to respond.

I also have a u-boot 2nd stage working on our board, and have tried the GPIO1 OE access from
there using command:

mw.l 4804c134 00400000

and the access hangs and does not complete.

Thanks for any ideas.

over 13 years ago

0 Viet Dinh over 13 years ago

TI__Genius 15310 points

Lee,

Please download the test SW package from Mistral site below:

http://www.mistralsolutions.com/pes-support/support-downloads/tmdxevm8148.html

It has a GPIO test in there.

BR,

Viet

0 Lee Nipper over 13 years ago in reply to Viet Dinh

Prodigy 60 points

In the Mistral package, I found an I2C based GPIO expander test for the Mistral board. (In src/Base_Board/i2c0_gpio )

That doesn't directly address my case, as I'm looking to access the GPIO directly from the Sitara 8174 processor after the GPIO signals have the PINCNTL setup.

0 Viet Dinh over 13 years ago in reply to Lee Nipper

TI__Genius 15310 points

Lee,

I think you mean Sitara 8147. The GPIO for DM8148 should work the same for 814x.

BR,

Viet

0 Anil over 13 years ago

TI__Expert 6655 points

Hi Lee,

AFAIK gpio clock is not enabled by the movement you do mw 0x4804C134 0x400000, you are seeing the hang

First enable the gpio1 clock and the then try writing to the GPIO registers

$ mw 0x48181560 0x2

Regards

AnilKumar

Please mark this Forum post as answered via the Verify Answer button below if it helps answer your question. Thanks!

0 Lee Nipper over 13 years ago in reply to Anil

Prodigy 60 points

Thank you Anil. That was the missing piece of information, enabling the gpio1 clock.

My question is now answered.

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GPIO1 not accessible from GEL script