CCS/LAUNCHXL-CC1352P: Unable to write to GPIO pins on CC1352P1

Tool/software: Code Composer Studio

Hello,

I am using the GPIO.h driver to try and set, toggle some pins on the CC1352P1. I have the pins connected to an oscilloscope to see what happens there. 

I am able to write to and toggle the user LEDs (Board_PIN_LED0, Board_PIN_LED1) just using the GPIO_write() function, and toggle them using the GPIO_toggle() function.

However, when I try the same for another digital GPIO pin, say Board_DIO12 (CC1352P1_LAUNCHXL_DIO12), I am unable to see the pin level change on the oscilloscope.

I am connecting my oscilloscope to DIO12 on my CC1352P1-Launchpad.

Here's my code to write to the pin : 

    /* Call driver init functions */
    GPIO_init();

    /* Configure the LED and button pins */
    GPIO_setConfig(CC1352P1_LAUNCHXL_DIO12, GPIO_CFG_OUT_STD| GPIO_CFG_OUT_LOW);

    /* Turn on user LED */
    while(1){
        if(GPIO_read(CC1352P1_LAUNCHXL_DIO12)==0)
            GPIO_write(CC1352P1_LAUNCHXL_DIO12, ~0);
        else
            GPIO_write(CC1352P1_LAUNCHXL_DIO12, 0);
        sleep(1);
    }

I am unable to see the level of this pin change on the oscilloscope. Moreover, GPIO_read() always reads the value back from this pin as 0.

I tried the same with CC1352P1_LAUNCHXL_SPI0_CSN, which is the chip select for the SPI0 module, and I did not see the level of that pin change on the oscilloscope either, but in the code, for my 'toggle' function, I can see that GPIO_read(CC1352P1_LAUNCHXL_SPI0_CSN) returns a 0 and a 1 alternatively. I connect my oscilloscope to the pin DIO11 for this test.

Please advise.

Warm regards,

Samyukta