Enabling UART disables the Radio

RE: Enabling UART disables the Radio

hmolesworth — Fri, 20 Nov 2020 00:20:14 GMT

Nice, you're welcome. In the code you were using both Tx and Rx were being set to pin P0.00 (~0x...1F), which happens to be the 32kHz crystal input pin (if enabled as such); I imagine the chip designers didn't plan on that, or Tx being connected to Rx :-)

RE: Enabling UART disables the Radio

ABHarr — Fri, 20 Nov 2020 00:00:27 GMT

No idea why this worked but thank you. I never would have gotten that on my own.

RE: Enabling UART disables the Radio

hmolesworth — Thu, 19 Nov 2020 23:46:49 GMT

Try replacing

NRF_UART0->PSELTXD &= ~GPIO_PIN27_Msk;
NRF_UART0->PSELRXD &= ~GPIO_PIN26_Msk;

with

NRF_UART0->PSELTXD = 27;
NRF_UART0->PSELRXD = 26;

assuming Tx is on pin 27 and Rx on pin 26 of course.

As an aside, mixing UART0 and UARTE0 is best avoided, even though they are the same physical address it makes the code confusing to review.