topic Re: Use TMS (PTA11) as GPIO in Vybrid Processors

Use TMS (PTA11) as GPIO

snowholgi — Mon, 09 Sep 2013 18:16:05 GMT

Hello,

I want to use PTA11 as GPIO.

By default, PTA 11 (TMS JTAG) is configured as JTAG,

I have set IOMUX to 0 but I can't toggle pad between HIGH and LOW.

Is there something special to do ?

Thanks for your help Holger

Re: Use TMS (PTA11) as GPIO

naoumgitnik — Mon, 09 Sep 2013 22:36:43 GMT

Hello Holger,

The Reference Manual counts 3500 pages :-) - may you provide more details about "set IOMUX to 0", please?

Sincerely, Naoum Gitnik.

Re: Use TMS (PTA11) as GPIO

anthony_huereca — Wed, 11 Sep 2013 12:47:05 GMT

Hi,

I believe the problem is that you need to enable the OBE bit. I tried this out on the tower board using the gpio example in the sample code, and it worked as expected.

IOMUXC->SINGLE.PTA11 = IOMUXC_PTB3_DSE(0x1)| IOMUXC_PTA11_OBE_MASK; //enable GPIO output for PTA11


	GPIO0->PDOR=~(PIN(4)); //corresponds with PTA11 and goes to gnd

	//Delay
	time_delay_ms(1000);


	GPIO0->PDOR=PIN(4); //corresponds with PTA11 and goes to VDD

-Anthony

Re: Use TMS (PTA11) as GPIO

snowholgi — Thu, 12 Sep 2013 12:06:27 GMT

Hello Naoum,

With IOMUX to 0 I mean set MUX_MODE of PTA11 to 0. Sorry.

But, in the meantime I have found an error in my driver.

Means PTA11 is working in the same way as other GPIOs.

Sorry.