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#include <stdbool.h>
#include <stdint.h>
#include <zephyr/device.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/util.h>
#define UART_DEVICE_NODE DT_CHOSEN(zephyr_shell_uart)
static const struct device *const uart_dev = DEVICE_DT_GET(UART_DEVICE_NODE);
#define SLIP_END 0xC0
#define SLIP_ESC 0xDB
#define SLIP_ESC_END 0xDC
#define SLIP_ESC_ESC 0xDD
void send_frame(uint8_t *buffer, size_t len) {
for (size_t i = 0; i < len; i++) {
uint8_t octet = *(buffer + i);
switch (octet) {
case SLIP_END:
uart_poll_out(uart_dev, SLIP_ESC);
uart_poll_out(uart_dev, SLIP_ESC_END);
break;
case SLIP_ESC:
uart_poll_out(uart_dev, SLIP_ESC);
uart_poll_out(uart_dev, SLIP_ESC_ESC);
break;
default:
uart_poll_out(uart_dev, octet);
break;
}
}
uart_poll_out(uart_dev, SLIP_END);
}
int main(void)
{
if (!device_is_ready(uart_dev)) {
printk("UART device not found!");
return 0;
}
uint8_t frame[] = {0xDE, SLIP_END, SLIP_ESC, 0xAD};
while (true) {
k_sleep(K_MSEC(1000));
send_frame(frame, ARRAY_SIZE(frame));
}
return 0;
}
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