no data present on pin after calling uart_poll_out()

RE: no data present on pin after calling uart_poll_out()

mark.zhang — Thu, 08 Jun 2023 16:04:14 GMT

HI, SwRa:

Thank you for replying !

The UARt issue was solved by delete the UART2 definition in DTS.

Mark,

RE: no data present on pin after calling uart_poll_out()

SwRa — Thu, 08 Jun 2023 11:19:39 GMT

Hi Mark,

Which sample is this you are trying.?

Regards,

Swathy

RE: no data present on pin after calling uart_poll_out()

mark.zhang — Mon, 22 May 2023 17:25:30 GMT

Hi, SwRa:

Uart1 works now, Data was transmitted on pin P0,13 after I added below line in overlay file:

/delete-node/ &{/pin-controller/uart1_default/group2/};

Actually, the chsen{} statement was not needed.

It seems that uart1_default has another definition in group2, I do not understand it, could you give me some advise ?

what means pin_controller and group2 ? I could not fins them in dts file.

RE: no data present on pin after calling uart_poll_out()

mark.zhang — Mon, 22 May 2023 16:53:07 GMT

Hi, SwRa:

I updated the overlay as:

model = "Nordic nRF52840 DK NRF52840";

compatible = "nordic,nrf52840-dk-nrf52840";

chosen{

nordic,nus-uart = &uart1;

};

&pinctrl {

uart1_default: uart1_default {

group1 {

psels = <NRF_PSEL(UART_TX, 0, 13)>,

<NRF_PSEL(UART_RX, 0, 16)>;

};

/* required if CONFIG_PM_DEVICE=y */

uart1_sleep: uart1_sleep {

group1 {

psels = <NRF_PSEL(UART_TX, 0, 13)>,

<NRF_PSEL(UART_RX, 0, 16)>;

low-power-enable;

};

&uart1 {

compatible = "nordic,nrf-uarte";

current-speed = <115200>;

status = "okay";

pinctrl-0 = <&uart1_default>;

pinctrl-1 = <&uart1_sleep>;

pinctrl-names = "default", "sleep";

};

But, no data present on pin P0, 13, I wonder why data was transmitted on pin P0, 13 if I use UART0 in overlay file ?

RE: no data present on pin after calling uart_poll_out()

SwRa — Mon, 22 May 2023 11:59:58 GMT

HI Mark,

Try adding the following to the overlay file:

chosen {
nordic,nus-uart = &uart1;
};

Regards,

Swathy

RE: no data present on pin after calling uart_poll_out()

mark.zhang — Fri, 19 May 2023 23:11:12 GMT

Hi, SwRa:

How are you !

I did couple testing,

1., I used UART0 instead of UART1 as below:

static const struct device *const uart1_dev = DEVICE_DT_GET(DT_NODELABEL(uart0));

I could see the 128 'a' on my computer console, that means uart_poll_out() working.

2. I used UART0 instead of UART1 in my overlay file as below:

&pinctrl {

uart0_default: uart0_default {

group1 {

psels = <NRF_PSEL(UART_TX, 0, 13)>,

<NRF_PSEL(UART_RX, 0, 16)>;

};

/* required if CONFIG_PM_DEVICE=y */

uart0_sleep: uart0_sleep {

group1 {

psels = <NRF_PSEL(UART_TX, 0, 13)>,

<NRF_PSEL(UART_RX, 0, 16)>;

low-power-enable;

};

&uart0 {

compatible = "nordic,nrf-uarte";

current-speed = <115200>;

status = "okay";

pinctrl-0 = <&uart0_default>;

pinctrl-1 = <&uart0_sleep>;

pinctrl-names = "default", "sleep";

};

then, I could see all communication data on pin P0, 13 with my scope.

I guess the reason is in config, please help.

Thanks,

RE: no data present on pin after calling uart_poll_out()

SwRa — Fri, 19 May 2023 13:30:34 GMT

Hi Mark,

I am sorry, but we are short staffed this week due to Public Holidays in Norway. I will get back to you with the updates on Monday.

Regards,

Swathy