Can't write SYSCFG registers

Jian Ma

Other Parts Discussed in Thread: OMAP-L138

Hi,

I used CCS to debug my OMAP code. I want to set PINMUX13 for testing the clock signal. I wrote data to PINMUX13: *PINMUX13 |= ( 1 << 4). But the content of register was unchanged when I check it from memory view. Also, the KICK0R and KICK1R contents were unchanged when I wrote data to them. Any suggestions?

Thanks!

over 12 years ago

0 Balaji Nagarajan over 12 years ago

TI__Intellectual 1280 points

Hi,

Please confirm that you added the boot.asm file in your project.

Refer the below link:
http://processors.wiki.ti.com/index.php/Boot_Images_for_OMAP-L138#Booting_ARM_Binaries

As per the link,

"Note that the ARM must be in supervisor mode in order to write to the PINMUX registers.
The TI Code Generation tools for the ARM put the ARM in user mode by default,
so this project includes a separate boot.asm file which keeps the ARM in supervisor mode.
This file should be included in all projects where the ARM needs to access certain SYSCFG
registers that require supervisor mode."

-Regards,
Balaji N

0 Jian Ma over 12 years ago in reply to Balaji Nagarajan

Intellectual 350 points

Hi Balaji:

Thank you very much for the suggestion.

I will try this out and let you know the result.

Best,

Jian

0 Jian Ma over 12 years ago in reply to Balaji Nagarajan

Intellectual 350 points

Hi Balaji:

I added boot.asm to the project and it works. Thanks!

Best,

Jian

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Can't write SYSCFG registers