I added my own overlay to the website routine "ncs-fund\v2.8.x-v2.7.0\l5\l5_e1_sol". The contents are as follows
///////////////////////////////////////////////////////////////
&button0 {
status = "disabled";
};
&button1 {
status = "disabled";
};
&button2 {
status = "disabled";
};
&button3 {
status = "disabled";
};
&spi00 {
status = "disabled";
};
&pwm20 {
status = "disabled";
};
&uart00 {
compatible = "nordic,nrf-uarte";
status = "okay";
current-speed = <115200>;
pinctrl-0 = <&uart00_default>;
pinctrl-1 = <&uart00_sleep>;
pinctrl-names = "default", "sleep";
hw-flow-control;
};
&pinctrl {
uart00_default: uart00_default {
group1 {
psels = <NRF_PSEL(UART_TX, 2, 8)>,
<NRF_PSEL(UART_RX, 2, 7)>,
<NRF_PSEL(UART_RTS, 2, 10)>,
<NRF_PSEL(UART_CTS, 2, 9)>;
};
};
uart00_sleep: uart00_sleep {
group1 {
psels = <NRF_PSEL(UART_TX, 2, 8)>,
<NRF_PSEL(UART_RX, 2, 7)>,
<NRF_PSEL(UART_RTS, 2, 10)>,
<NRF_PSEL(UART_CTS, 2, 9)>;
low-power-enable;
};
};
};
///////////////////////////////////////////////////////////////
I changed to use uart00 in main.c
Finally, I used the USB to TTL serial port board to connect the pin of the PDK board, open or not open the flow control, I could not see the print
I tried both sets of pins on the spec,I'm disabled. uart20 will fail to compile
