54cbf45c74
Add support for communication with serial ports on native POSIX platform via UART driver API. Serial port driver supports polling API, configuration of the serial ports used via devicetree and command line options, and runtime configuration with `uart_configure`. Multiple instances of the driver are supported. Example use and configuration is also demonstrated in the `samples/drivers/uart/native_tty` sample. Closes: #56586 Signed-off-by: Marko Sagadin <marko.sagadin42@gmail.com>
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/*
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* @brief Native TTY UART sample
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*
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* Copyright (c) 2023 Marko Sagadin
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/uart.h>
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#include <stdio.h>
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#include <string.h>
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const struct device *uart0 = DEVICE_DT_GET(DT_NODELABEL(uart0));
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const struct device *uart2 = DEVICE_DT_GET(DT_NODELABEL(uart2));
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struct uart_config uart_cfg = {
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.baudrate = 9600,
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.parity = UART_CFG_PARITY_NONE,
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.stop_bits = UART_CFG_STOP_BITS_1,
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.flow_ctrl = UART_CFG_FLOW_CTRL_NONE,
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.data_bits = UART_CFG_DATA_BITS_8,
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};
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void send_str(const struct device *uart, char *str)
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{
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int msg_len = strlen(str);
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for (int i = 0; i < msg_len; i++) {
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uart_poll_out(uart, str[i]);
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}
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printk("Device %s sent: \"%s\"\n", uart->name, str);
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}
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void recv_str(const struct device *uart, char *str)
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{
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char *head = str;
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char c;
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while (!uart_poll_in(uart, &c)) {
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*head++ = c;
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}
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*head = '\0';
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printk("Device %s received: \"%s\"\n", uart->name, str);
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}
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int main(void)
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{
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int rc;
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char send_buf[64];
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char recv_buf[64];
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int i = 10;
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while (i--) {
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snprintf(send_buf, 64, "Hello from device %s, num %d", uart0->name, i);
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send_str(uart0, send_buf);
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/* Wait some time for the messages to arrive to the second uart. */
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k_sleep(K_MSEC(100));
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recv_str(uart2, recv_buf);
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k_sleep(K_MSEC(1000));
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}
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uart_cfg.baudrate = 9600;
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printk("\nChanging baudrate of both uart devices to %d!\n\n", uart_cfg.baudrate);
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rc = uart_configure(uart0, &uart_cfg);
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if (rc) {
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printk("Could not configure device %s", uart0->name);
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}
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rc = uart_configure(uart2, &uart_cfg);
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if (rc) {
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printk("Could not configure device %s", uart2->name);
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}
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i = 10;
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while (i--) {
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snprintf(send_buf, 64, "Hello from device %s, num %d", uart0->name, i);
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send_str(uart0, send_buf);
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/* Wait some time for the messages to arrive to the second uart. */
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k_sleep(K_MSEC(100));
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recv_str(uart2, recv_buf);
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k_sleep(K_MSEC(1000));
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}
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return 0;
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}
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