Hi everyone,
I'm working with the nRF9160 and trying to configure P0.19 as the UART TX pin using Zephyr.
Here's the configuration I used in the device tree:
uart1_default: uart1_default {
group1 {
psels = <NRF_PSEL(UART_TX, 0, 19)>; // TX in board = P0.19
// nordic,drive-mode = <NRF_DRIVE_H0D1>;
};
group2 {
psels = <NRF_PSEL(UART_RX, 0, 20)>; // RX in board = P0.10
bias-pull-up;
};
};
uart1_sleep: uart1_sleep {
group1 {
psels = <NRF_PSEL(UART_TX, 0, 19)>,
<NRF_PSEL(UART_RX, 0, 20)>;
low-power-enable;
};
};
However, the UART does not transmit any data. When I change to another pin like P0.11, it works fine.
-
Is there any hardware limitation that prevents using P0.19 as a TX pin?
-
Does Zephyr or the modem firmware restrict certain GPIOs from being used for UART?
-
Any way to check if the pin configuration is being applied correctly at runtime?
Thanks in advance!
