OMAP-L137 PRU GPIO access

Greg Fichter

Other Parts Discussed in Thread: OMAP-L137, OMAP-L138

I would like to read GPIO port 0 using PRU0. Can this be done with register r30, which the PRU wiki refers to as accessing GPIO inputs? I haven't been able to find a statement of how r30 is mapped to the GPIO banks of the L137.

Thanks for any advice.

Greg

over 14 years ago

0 Greg Fichter over 14 years ago

Prodigy 200 points

Sorry, I meant r31.

0 clam over 14 years ago in reply to Greg Fichter

TI__Expert 8785 points

For OMAP-L137, the PRUSS does not have designated I/O pins. Therefore, if you want to read back the GPIO Bank 0, you'll have to program the PRU to access the GPIO module memory mapped registers.

For OMAP-L138, the PRUSS has it's own designated I/O pins. Therefore, R30 and R31 controls PRU_R3x[n] pins on the device.

Hope this answers your question.
--Christina

Processors

Processors forum

OMAP-L137 PRU GPIO access