Need to get nRF 9151 UART <=> IOT to work

[RamizB]

hello,

I have nRF9151 and would like to connect UART1  (Rx PO.28 & Tx PO.29) to an external IOT device.  it only supports the Tx/Rx port. There is HW control.

My goal is to send one character 'A' on the port and then receive 2 characters. i can't make it to work. I followed the instructions to configure the device but not able to make it work!

Attached provide the configuration of application with simply loop at the to do the actual Tx/Tx and would greatly appreciate any help to make this work for me.

Thanks for your help in advance.

regards

Ramizblinky-UART.zip

[Vidar Berg]

Hello,

Please ensure that the nRF9151 and the external MCU operate with the same I/O voltage and share common ground. For futher troubleshooting, it would also helpful if you could use a scope or logic analyzer to probe the TX/RX lines to check if data is being transmitted.

Best regards,

Vidar

[RamizB]

the issue is that the SW is not able to activate the UART port. i need help some looking at the software, makefile, ... config

[Vidar Berg]

I tried building the sample you uploaded and got a build error because the uart1 node is disabled. It is disabled by default since it is used by for logging by the TF-M image. If you want to use this uart instance in your application, you should first disable UART logging in TF-M by adding CONFIG_TFM_SECURE_UART=n and CONFIG_TFM_LOG_LEVEL_SILENCE=y to your project configuration (prj.conf), then create a devicetree overlay to change the status to "okay":

&uart1 {
    status = "okay";
};

[RamizB]

Vidar, thanks for the help and feedback.  Thanks for the update.  i modified the prj.conf, and added overlay.conf as suggested.

attached is a zip file for the folder.

when i execute the code in debug mode, it goes to execute line 87 "printf("Could not configure device uart1\n");"

UART port configuration does not seem to be happening correctly. 

looking forward for your guidance.

native_tty-UART - Nov25.zip

[Vidar Berg]

uart_configure() returned -ENOTSUP (-134) because CONFIG_UART_USE_RUNTIME_CONFIGURE was not enabled in your project configuration. By the way, the board overlay should be named "nrf9151dk_nrf9151_ns.overlay" if you are using  the nRF9151DK.