apps/uart-loopback/main.c

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#include <board.h>
#include <clk/sys.h>
#include <led.h>
#include <uart.h>
#include <uart/ctrl.h>

#define UART_ID CONFIG_UART_ID

#ifndef CONFIG_BOARD_LED_READY
# define CONFIG_BOARD_LED_READY BOARD_LED0_ID
#endif
#ifndef CONFIG_BOARD_LED_XFER
# define CONFIG_BOARD_LED_XFER  BOARD_LED1_ID
#endif

int main(void)
{
        uint8_t data;
        bool led_on = true;

        sysclk_init();
        board_init();

        uart_enable_clock(UART_ID);
        uart_ctrl_init_defaults(UART_ID);
        uart_enable(UART_ID, UART_FLAG_RX | UART_FLAG_TX);

        // Light up a LED to show that we are ready
        led_activate(CONFIG_BOARD_LED_READY);

        for (;;) {

                while (!uart_get_byte(UART_ID, &data))
                        ;
                // toggle a LED each time we get data
                if (led_on == true) {
                        led_activate(CONFIG_BOARD_LED_XFER);
                        led_on = false;
                }
                else {
                        led_deactivate(CONFIG_BOARD_LED_XFER);
                        led_on = true;
                }
                while (!uart_put_byte(UART_ID, data))
                        ;
        }
}

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