DLPNIRNANOEVM: Writing to the GPIO pins with the expansion connector

Emily Pitts

Part Number: DLPNIRNANOEVM
Other Parts Discussed in Thread: TIDA-00554

I am using an optical switch with my NIRScan Nano, attched through the expansion connector. I'm trying to write to pins A2, A3, and K2 and use them for binary logic to switch the channel number on my optical switch. However, I can't seem to get it to actually write to those pins. I have tried adding code in bothe the NIRscanNano_powerUp() function and the NIRscanNano_initGPIO() function in the NIRscanNano.c file. The lines of code I added are shown below:

MAP_GPIOPinTypeGPIOOutput( GPIO_PORTA_BASE, GPIO_PIN_2 );
MAP_GPIOPinTypeGPIOOutput( GPIO_PORTA_BASE, GPIO_PIN_3 );
MAP_GPIOPinTypeGPIOOutput( GPIO_PORTK_BASE, GPIO_PIN_2 );

MAP_GPIOPinWrite( GPIO_PORTA_BASE, GPIO_PIN_2, 1 );
MAP_GPIOPinWrite( GPIO_PORTA_BASE, GPIO_PIN_3, 1 );
MAP_GPIOPinWrite( GPIO_PORTK_BASE, GPIO_PIN_2, 1 );

I don't know if I need to be writing to the pins in another file, or if I'm just writing to them incorrectly. I'm trying to writing all three pins (A2, A3, K2) as high.

Thanks!

over 6 years ago

0 Philippe Dollo over 6 years ago

TI__Mastermind 28005 points

Emily,

While we check the GPIO implementation details, can you confirm which version of the NIRscan Nano software you are using as your source?

Regards,
Philippe Dollo

0 Emily Pitts over 6 years ago in reply to Philippe Dollo

Prodigy 100 points

Yes. I am using version 2.1.0.

0 Hirak Biswas over 6 years ago in reply to Emily Pitts

TI__Genius 10925 points

Hi Emily,
Kindly check the TIDA-00554 Schematic to find out how the mentioned GPIOs are used. As can be seen on the TIVA Board schematic, the pins A2, A3 and K2 are being used as UART4 RX,TX and RTS respectively. That means these pins are reconfigured as UART pins later on in the code. Do you want to sacrifice the UART functionality and use these pins as GPIO?

Thanks & Regards,
Hirak.

0 Emily Pitts over 6 years ago in reply to Hirak Biswas

Prodigy 100 points

Yes, I would like to sacrifice that UART functionality. I would like to configure them as GPIO

Thanks,
Emily

0 Hirak Biswas over 6 years ago in reply to Emily Pitts

TI__Genius 10925 points

Hi Emily,

You can do 2 things.
- You can call the MAP_GPIOPinTypeGPIOOutput() functions AFTER the Board_initUART() has been called in main() function on main.c.
- You can stick with your current code (adding MAP_GPIOPinTypeGPIOOutput() funtions in NIRscanNano_initGPIO() function, BUT you have to modify line no. 753 in NIRScanNano.c to make it "#if 0" in place of "#ifdefined(ENABLE_UART_COMMAND_INTERFACE) || (defined(DEBUG_MSGS) && (LOG_PORT == UART_CONSOLE))". Now the GPIOs should work as expected.

Thanks & Regards,
Hirak.

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DLPNIRNANOEVM: Writing to the GPIO pins with the expansion connector