nrf9160 uart0 uart_tx no output

[john.liu]

ncs v2.2.0

void uart_init(void)
{
	uart = device_get_binding(DT_NODE_FULL_NAME(DT_NODELABEL(uart0)));
	if (!device_is_ready(uart)) { LOG_INF("UART not ready!\n"); }
	user_uart_rx_enable();
}

void uart_example(void)
{
    uint8_t tx[]="1234567890\r\n";
	printk("UART loopback start!\r\n");
    uart_tx( uart, tx, 12, 0);
	k_sem_take(&uarte_tx_finished, K_FOREVER);

}

I think it outputs "1234567890".but it doesn't.

printk has output, but uart_tx does not. Previous NCS versions have output.

This is code:

1057.hello_world.zip

[Raoul]

Hi John,

Thanks for sharing your code, that's useful. We will take a look at this soon and get back to you.

Best regards,

Raoul

[Susheel Nuguru]

Are you testing this on a nRF DK?, have you checked if the UART pins set for uart0 are being redirected to the console? If you are using nRF DK then listening to the CDC USB COM port will only show the data of uart_tx if the uart pins are the same that are connected to the on board chip. Those pin numbers are are printed at the back of the the DK.