I have developed a custom board using nrf52840 IC and I need to use UART. For this I have two pins available P0.19 and P0.20 to be configured as RX and TX. I checked those pins in boards.h, where P0.19 is used as QSPI CLK and P0.20 is used as QSPI IO. I don't want any spi configurations in my project. I tried changing definitions of RX and TX to pin 19 and 20 respectively, but didn't get the output. So my doubt was whether SPI CLOCK PIN can be configured to UART pin or not.
