RTOS/TI-RTOS-MCU: GPIO pin interrupt configuration

M Syd Ahmed

Part Number: TI-RTOS-MCU

Tool/software: TI-RTOS

Which files are needed to change to configure GPIO interrupt. I changed Board.h, EXTM4C129EXL.c, EXTM4C129EXL.h. For some reasons Interrupt is not occuring at PE0, but it did in PE2. In the above files, I checked and PE0 was not configured for any module. only in GPIO interrupt. Why does PE0 didnt give interrupt, but PE2 did. Is there any restrictions regarding GPIO interrupt configuration like we can't configure some pins for GPIO interrupt. If yes, what are the pins we cant configure GPIO.?

over 9 years ago

0 Darius Williams over 9 years ago

TI__Expert 4440 points

M Syd Ahmed,

Did you logical OR the pin with GPIO_CFG_INPUT in your GPIO Config?

Derrick

0 M Syd Ahmed over 9 years ago in reply to Darius Williams

Expert 1035 points

Yes. I did. but its not working. Apart from pins configured in EKTM4C129EXL.c, is their any pins used for different purpose?

0 M Syd Ahmed over 9 years ago in reply to Darius Williams

Expert 1035 points

Also, is there any dedicated interrupt pins which is not used by any other module directly or indirectly?

0 Darius Williams over 9 years ago in reply to M Syd Ahmed

TI__Expert 4440 points

M Syd Ahmed,

Could you share your EKTM4C129EXL.c file?

I was able to import the GPIO Interrupt example and get an interrupt on pin PE0 by using a logical OR with GPIO_CFG_INPUT. Are you setting the pin as a pull up or pull down? You may want to configure the pin as a pull down instead of a pull up.

Pin descriptions are found here in the datasheet. Looks like the PE0 and PE2 pins can also be used as UART flow control. All the pins, in general, have some secondary function besides being a general purpose I/O.

Derrick

0 M Syd Ahmed over 9 years ago in reply to Darius Williams

Expert 1035 points

We need to configure that in pull up rising edge interrupt. Is their any reason why we need to configure that pin as pull down?. PE0 and PE2 works as UART flow control only when we configured them as UART isn't it?

0 Darius Williams over 9 years ago in reply to M Syd Ahmed

TI__Expert 4440 points

M Syd Ahmed,

If your interrupt signal is supplying a logical 1, you would want a pull down. If your interrupt signal is supplying a logical 0 (GND), you would want a pull up.

The UART pins are only used as flow control when configured for a UART, correct.

Derrick

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RTOS/TI-RTOS-MCU: GPIO pin interrupt configuration