hi:
I use ncs v2.1.1
Add uart1 or uart0 to the bink example.
results of enforcement:

prj.conf
CONFIG_GPIO=y # UART interface CONFIG_SERIAL=y CONFIG_UART_ASYNC_API=y CONFIG_NRFX_TIMER2=y
Source code part:
struct device *uart;
static K_SEM_DEFINE(uarte_tx_finished, 0, 1);
static uint8_t uart_rx_buf[1024];
static void uart_callback(const struct device *dev,
struct uart_event *evt,
void *user_data)
{
uint8_t *p;
int len;
switch (evt->type)
{
case UART_TX_DONE:
k_sem_give(&uarte_tx_finished);
break;
case UART_TX_ABORTED:
k_sem_give(&uarte_tx_finished);
break;
case UART_RX_RDY:
len = evt->data.rx.len;
p = evt->data.rx.buf + evt->data.rx.offset;
printk("%s\r\n",p);
break;
case UART_RX_BUF_REQUEST:
break;
case UART_RX_BUF_RELEASED:
break;
case UART_RX_DISABLED:
break;
case UART_RX_STOPPED:
break;
}
}
static int user_uart_rx_enable(void)
{
int err;
err = uart_callback_set(uart, uart_callback, (void *)NULL);
if (err) {
}
err = uart_rx_enable(uart, uart_rx_buf, sizeof(uart_rx_buf),
5 * USEC_PER_MSEC);
if (err) {
} else {
}
return err;
}
void uart_init(void)
{
uart = device_get_binding("UART_1");
user_uart_rx_enable();
}
void uart_example(void)
{
uint8_t tx[]="1234567890\r\n";
uart_tx( uart, tx, 12, 0);
k_sem_take(&uarte_tx_finished, K_FOREVER);
}

