Hello,
I have problems in the async-mode with the UART21 output and the nRF54L15. I am using Toolchain v3.1.1 and SDK v3.1.1.
When I use the uart_tx function to print out more than 8 Bytes the output doesnt work, when I make a k_mssleep directly afterwards. I get only a crypted output.
tx_buf_length = snprintf((char *)tx_buf, sizeof(tx_buf), "Counter: %d\r\n", counter);
tx_busy = true;
err = uart_tx(uart_dev, tx_buf , tx_buf_length, 100 * USEC_PER_MSEC);
It works if I place before:
while (tx_busy) {
k_yield();
}
My Sourcecode works fine with the nRF52840dk and uart1. I tried it already with semaphore too. No success. My full code is:
#include <stdio.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/uart.h>
#define SLEEP_TIME_MS 200
#define UART_NODE DT_NODELABEL(uart21)
//#define UART_NODE DT_NODELABEL(uart1)
const struct uart_config uart_cfg = {
.baudrate = 115200,
.parity = UART_CFG_PARITY_NONE,
.stop_bits = UART_CFG_STOP_BITS_1,
.data_bits = UART_CFG_DATA_BITS_8,
.flow_ctrl = UART_CFG_FLOW_CTRL_NONE
};
static uint8_t tx_buf[25];
static int tx_buf_length;
static int counter=0;
static volatile bool tx_busy = false;
static volatile int bytes_sent = 0;
static void uart_cb(const struct device *dev, struct uart_event *evt, void *user_data)
{
switch (evt->type) {
case UART_TX_DONE:
bytes_sent = evt->data.tx.len;
tx_busy = false;
printf("TX_DONE: %d bytes\n", evt->data.tx.len);
break;
case UART_TX_ABORTED:
tx_busy = false;
printf("TX_ABORTED\n");
break;
default:
printf("UART event: %d\n", evt->type);
break;
}
}
int main(void)
{
int err;
const struct device *uart_dev = DEVICE_DT_GET(UART_NODE);
if (!device_is_ready(uart_dev)) {
return 0;
}
err = uart_configure(uart_dev, &uart_cfg);
if (err == -ENOSYS) {
return -ENOSYS;
}
printf("uart_dev ready\n");
err = uart_callback_set(uart_dev, uart_cb, NULL);
if (err) {
return err;
}
printf("uart_cb set\n");
while (1)
{
if (!tx_busy) {
counter++;
tx_buf_length = snprintf((char *)tx_buf, sizeof(tx_buf), "Counter: %d\r\n", counter);
tx_busy = true;
err = uart_tx(uart_dev, tx_buf , tx_buf_length, 100 * USEC_PER_MSEC);
if (err) {
printf("uart_tx failed: %d\n", err);
tx_busy = false;
}
}
/*while (tx_busy) {
k_yield();
}*/
k_msleep(SLEEP_TIME_MS);
}
return 0;
}
