Re: Help required on reading UART device and print on console

Erwan Gouriou

Hi Dhamu,

I saw the task you entered in Jira afterwards and now better understand your question.
Indeed, you might need additional settings to get these ports working:
One point is that you should activate them in dts files and nucleo_l476rg_defconfig.
Also, please check that GPIO ports are activated according to your pinmuxing.
I'll have a check and get back to you.

A sample test was present some time ago, but it has been moved to tests section and now is more adapted to extensive testing rather than simple (re-)use.
Re-instanciating a basic serial sample might indeed be a good idea.


On 9 May 2017 at 15:12, Dhamodharan Krishnan <dhamukrish@...> wrote:
Thanks Erwan for your reply.

Basically, I was able to use UART2 without any issue. But I have GPS and GSM modules which are serial device and hence need UART1 and 3 apart from UART2 for fetching and processing the data.

Would be very helpful if any example or advise much appreciated.


On 09-May-2017, at 12:48 PM, Erwan Gouriou <erwan.gouriou@...> wrote:

Hi Digidhamu,

If you're trying to use default UART (through ST link USB port) on nucleo_l476rg, you should use UART_2.


On 6 May 2017 at 09:53, Dhamodharan Krishnan <dhamukrish@...> wrote:

I am a day old since I started in Zephyr and from Arduino background. Could you please help with an example how to read from UART ports which are from (Blinky and Hello World example are working fine).

Here is the code I have tried but failed.

#include <zephyr.h>
#include <misc/printk.h>
#include <uart.h>

int main(void) {

struct device *uartGPS;
uartGPS = device_get_binding(UART_1);

while (1) {
unsigned char* msg;
uart_poll_in(uartGPS, msg);

printk("%s", msg);


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