Hello,
I am developing an nRF5340 custom board by setting the pins as shown below.
- P0.19: UART_RX
- P0.20 : UART_TX
- P0.21: GPIO Output
I have a problem when trying to use the P0.21 pin as a GPIO output that used to be used as UART_CTS on the nRF5340DK.
When I add below code in app.overlay file and set GPIO values to 0 and 1, it always outputs 0.
&pinctrl {
uart0_default: uart0_default {
group1 {
psels = <NRF_PSEL(UART_TX, 0, 20)>;
};
group2 {
psels = <NRF_PSEL(UART_RX, 0, 19)>;
bias-pull-up;
};
};
uart0_sleep: uart0_sleep {
group1 {
psels = <NRF_PSEL(UART_TX, 0, 20)>,
<NRF_PSEL(UART_RX, 0, 19)>;
low-power-enable;
};
};
}
However, if the above code is removed from the app.overlay file and the nrf5340_cpuapp_common-pinctrl.dtsi file of the nRF Connect SDK is modified as above, it works fine.
I think it is not correct to modify the nrf5340_cpuapp_common-pinctrl.dtsi file.
Could you please let me know if there is a way to use P0.21 by modifying the app.overlay file?
Regards,
Seongbin
