mbed_async.cpp

#include "mbed.h"

#if DEVICE_SERIAL_ASYNCH
    Serial pc(USBTX, USBRX);
#else
    #error "Platform not compatible with Serial async"
#endif

#define BUFF_LENGTH     5

uint8_t rx_buf[BUFF_LENGTH];

void serialCb(int events) {
    if (events & SERIAL_EVENT_RX_CHARACTER_MATCH) {

    } else if (events & SERIAL_EVENT_RX_COMPLETE) {
        pc.printf("received data: \n");

        for (int i = 0; i < BUFF_LENGTH; ++i) {
            pc.printf("%c", rx_buf[i]);
        }

        pc.printf("\n");

    } else {
        pc.printf("Error\n");
    }

    pc.read(rx_buf, BUFF_LENGTH, event_callback_t(serialCb), SERIAL_EVENT_RX_ALL);
}

int main() {
    pc.printf("Async serial example\n");
    pc.read(rx_buf, BUFF_LENGTH, event_callback_t(serialCb), SERIAL_EVENT_RX_ALL);

    while (1) {};
}