Enabling CONFIG_UART_0_NRF_UART in nrf connect

Question

I want to use CONFIG_UART_0_NRF_UART instead of CONFIG_UART_0_NRF_UARTE. But I don't get any option for this because CONFIG_UART_0_NRF_UARTE is selected by default . 
 
 I want to have 
 # # Serial Drivers # CONFIG_UART_NRFX=y CONFIG_UART_0_NRF_UART=y # CONFIG_UART_0_INTERRUPT_DRIVEN is not set CONFIG_UART_0_ASYNC=y # CONFIG_UART_0_NRF_PARITY_BIT is not set CONFIG_NRF_UART_PERIPHERAL=y

But always getting 
 # # Serial Drivers # CONFIG_UART_NRFX=y CONFIG_UART_0_NRF_UARTE=y CONFIG_UART_0_ENHANCED_POLL_OUT=y # CONFIG_UART_0_INTERRUPT_DRIVEN is not set CONFIG_UART_0_ASYNC=y # CONFIG_UART_0_NRF_PARITY_BIT is not set CONFIG_UART_0_NRF_TX_BUFFER_SIZE=32 # CONFIG_UART_0_NRF_HW_ASYNC is not set # CONFIG_UART_0_NRF_ASYNC_LOW_POWER is not set CONFIG_UART_ENHANCED_POLL_OUT=y CONFIG_NRF_UARTE_PERIPHERAL=y

Also if I put the required configuration in the proj.config, cmake fails to compile the project. 
 
 This is what I can get.

Susheel Nuguru · Accepted Answer

Not sure why it worked for me earlier, but it seems like you need to edit the dts fie for that.

in the file zephyr\drivers\serial\Kconfig.nrfx there seems to be a check before enabling the UART legacy module

config UART_0_NRF_UART
	def_bool $(dt_nodelabel_has_compat,uart0,$(DT_COMPAT_NORDIC_NRF_UART))
	select NRF_UART_PERIPHERAL
	help
	  Enable nRF UART without EasyDMA on port 0.

config UART_0_NRF_UARTE
	def_bool $(dt_nodelabel_has_compat,uart0,$(DT_COMPAT_NORDIC_NRF_UARTE))
	select NRF_UARTE_PERIPHERAL
	help
	  Enable nRF UART with EasyDMA on port 0.

when I edit v1.8.0\zephyr\boards\arm\nrf52dk_nrf52832\nrf52dk_nrf52832.dts

to remove compatibility nrf-uarte and replace it wiath nrf-uart

arduino_serial: &uart0 {
	status = "okay";
	compatible = "nordic,nrf-uart";
	current-speed = <115200>;
	tx-pin = <6>;
	rx-pin = <8>;
	rts-pin = <5>;
	cts-pin = <7>;
};

Then the config in your project seems to look the way you want

#
# Serial Drivers
#
CONFIG_UART_NRFX=y
CONFIG_UART_0_NRF_UART=y
# CONFIG_UART_0_INTERRUPT_DRIVEN is not set
# CONFIG_UART_0_NRF_PARITY_BIT is not set
CONFIG_NRF_UART_PERIPHERAL=y
# CONFIG_UART_ALTERA_JTAG is not set
# CONFIG_UART_RTT is not set
# CONFIG_UART_XLNX_UARTLITE is not set

Enabling CONFIG_UART_0_NRF_UART in nrf connect

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