TM4C1294XL TI-RTOS: GPIO Init

Sean Mackenzie

Other Parts Discussed in Thread: EK-TM4C1294XL

I'm having trouble setting up the GPIO init structure to make some pins writeable.

So far I have imported the "empty" example project which ran fine. I added my pins to the GPIO_PinConfig gpioPinConfigs[] in EK_TM4C1294XL.c in the exact same format as USR_D1 and D2 (GPIOTiva_PN_1 and GPIOTiva_PN_0). When I try and call GPIO_write(GPIOTiva_PP_2, 1) it dies. This prints the following to console

FSR = 0x0000

HFSR = 0x40000000

DFSR = 0x0000000b

MMAR = 0xe000ed34

BFAR = 0xe000ed38

AFSR = 0x00000000

Terminating execution...

Is there something I'm missing? It's obviously something to do with initialising the outputs but what? I tried digging through the examples and the TI-RTOS manual but found nothing on GPIO initialisation really.

Thanks in advance

over 9 years ago

0 Amit Ashara over 9 years ago

TI__Guru**** 244400 points

Hello Sean,

Is the clock to the GPIO port enabled?

Regards
Amit

0 Sean Mackenzie over 9 years ago in reply to Amit Ashara

Prodigy 20 points

Hello Amit,

Thanks for the response. It seems TI-RTOS is meant to do that based on the GPIO init struct? I've been going off of chapter 5.5 here

http://www.ti.com/lit/ug/spruhd4l/spruhd4l.pdf

I couldn't find any useful info in ti/drivers/GPIOTiva.h or .c

The only use of GPIO_write i've come across in the example code is on the onboard LEDs, which I assume are setup somewhere by default.

Regards,

Sean

0 Amit Ashara over 9 years ago in reply to Sean Mackenzie

TI__Guru**** 244400 points

Hello Sean,

It should be in one of the structures for GPIO initialization. I have asked my colleague to help you

Regards
Amit

0 Sai Reddy over 9 years ago in reply to Amit Ashara

TI__Mastermind 22580 points

Hello Sean,

Are you able to control the LEDs (GPIOs N0 and N1) with the "empty" example project?

If yes, can you control the values of GPIOs like N4 and N5 by adding them to the array "gpioPinConfigs" in "EK-TM4C1294XL.c" file? Once this works we can see why PP0 and PP1 are not working.

Thanks,
Sai

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C1294XL TI-RTOS: GPIO Init