My CC1120 is connected to a STM32 MCU via SPI, and I am able to successfully read/write to registers. However I need to send a MARC_MCU_WAKEUP interrupt signal via GPIO, but I can't seem to get the pin to output anything other than low (using an oscope). Since it's possible there is no interrupt triggered with my Rx code, I've also tried simply outputting the EXT_CLOCK and CHIP_RDY signals to see if the GPIO3 pin works but no luck. I can verify I am writing the correct values to IOCFG3 register (20, 49, or 50 in decimal).
Is there anymore config needed other than the IOCFG3 register? Is there a simple test I can perform to ensure that the GPIO pin can even go high?
Thanks for your help!
Edit: I should also mention that I'm using the EM I/O breakout pins on the TrxEB eval board (for working SPI and non-working GPIO), following Section 7.3 in http://www.ti.com/lit/ug/swru294a/swru294a.pdf