EK-TM4C1294XL: GPIO will not output a high signal despite that I configured it.

JoEquity

Part Number: EK-TM4C1294XL

Hi,

I am having trouble setting one of the GPIO's to output a signal high. I used SysCtlPeripheralEnable, GPIOPinTypeGPIOOutput, GPIOPadConfigSet, and GPIOPinWrite in this exact order, using "1" as my write value. Despite using this configuration, the GPIO does not output a signal at all.

-John

over 6 years ago

0 Ralph Jacobi over 6 years ago

TI__Guru*** 135355 points

Hello JoEquity,

That is not the proper usage for GPIOPinWrite, you need to use the bit field definition such as GPIO_PIN_1. If you write just a '1' as the parameter, all you will write to is GPIO_PIN_0.

For example, to write Pin 1:

GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, GPIO_PIN_1);

0 JoEquity over 6 years ago in reply to Ralph Jacobi

Prodigy 70 points

Thank you Ralph, I figured that out after looking at one of the LED examples, noting that the function writes to itself to drive the GPIO pin high and writing it elsewhere drives it low.

0 JoEquity over 6 years ago in reply to Ralph Jacobi

Prodigy 70 points

Hi Ralph,

I had a follow-up question. How would I turn off the GPIO? I want to be able to turn the GPIO on and off. Thank you for your help.

-John

0 Ralph Jacobi over 6 years ago in reply to JoEquity

TI__Guru*** 135355 points

Hello John,

Turning off the GPIO just needs to be done by writing a zero, so that's simple in comparison. You can turn off multiple at once too by OR'ing the second parameter which are all the GPIO you want to turn off.

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EK-TM4C1294XL: GPIO will not output a high signal despite that I configured it.