Config P1.00 and P1.01 as UART0 RX and TX

Question

Hi, 
 We are developing our product using nrf5340. Currently, we are using NCS v1.9.1 for development. We need to give UART to test our Board for Certain conditions by using a TTL converter. We have given the P1.00 as Rx and P1.01 as TX. I have tried changing the overlay file but the two specific pins not working properly. for your reference, I have attached my Overlay file also here. Kindly, Check and help me to resolve this. My main motive is I want to use Peripheral Uart kind of stuff. 
 
 7144.nrf5340dk_nrf5340_cpuapp.overlay 
 
 Thanks & Regards, 
 Navin

Øivind · Accepted Answer

Add this to your overlay file for the app core: 
 &gpio_fwd {
 status = "disabled";
}; 
 For the network core, add a folder called "child_image" to your project, at the same location as your CMakeLists.txt file. In this folder add a file named "hci_rpmsg.overlay" and a file named "hci_rpmsg.conf". These files will be automatically applied to the network core child image. 
 In hci_rpmsg.overlay: 
 &uart0 {
	status = "disabled";
}; 
 In hci_rpmsg.conf: 
 CONFIG_SERIAL=n
CONFIG_UART_CONSOLE=n 
 This will disable the uart0 on the network core, and stop the app core from forwarding the pins. 
 Uart logging from the network core will be disabled.

Config P1.00 and P1.01 as UART0 RX and TX

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