RIOT/tests/sys_arduino/arduino-test.sketch

/*
 * Copyright (C) 2018 Federico Pellegrin <fede@evolware.org>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @ingroup     tests
 * @{
 *
 * @file
 * @brief       Test application for arduino module
 *
 * @author      Federico Pellegrin <fede@evolware.org>
 *
 * @}
 */

#include <stdlib.h>
#include <string.h>

#ifdef STDIO_UART_BAUDRATE
#define SERIAL_BAUDRATE STDIO_UART_BAUDRATE
#else
#define SERIAL_BAUDRATE 115200
#endif

/* Input buffer for receiving chars on the serial port */
char buf[64];

/* Counter of received chars in currently receiving line */
int count = 0;

void setup(void)
{
    Serial.begin(SERIAL_BAUDRATE);
    Serial.println("Hello Arduino!");
}

void loop(void)
{
    /* Read chars if available and seek for CR or LF */
    while (Serial.available() > 0) {
        int tmp = Serial.read();
        if (tmp == '\n' || tmp == '\r') {
           buf[count] = 0;

           if (count > 1) {
                if (strncmp(buf, "echo", 4) == 0) {
                    /* echo command just echoes back the input string */
                    Serial.write("ECHO:");
                    for (int i = 4; i < count; i++) {
                        Serial.write(buf[i]);
                    }
                } else if (strncmp(buf, "numb", 4) == 0) {
                    /* numb command prints input number in various formats */
                    int numb=atoi(buf + 5);
                    Serial.print(numb);
                    Serial.print(" ");
                    Serial.print(numb, DEC);
                    Serial.print(" ");
                    Serial.print(numb, HEX);
                    Serial.print(" ");
                    Serial.print(numb, OCT);
                } else if (strncmp(buf, "time", 4) == 0) {
                    /* time command tests printing time and sleeps  */
                    unsigned long curtime = micros();
                    unsigned long curtime2, curtime3;

                    Serial.print((int) curtime);
                    delay(36);
                    Serial.print(" ");
                    curtime2=micros();
                    Serial.print((int) curtime2);
                    delayMicroseconds(36000);
                    Serial.print(" ");
                    curtime3=micros();
                    Serial.print((int) curtime3);

                    /* test also that time is actually running */
                    if ((curtime3 > curtime2) && (curtime2 > curtime)) {
                        Serial.print(" OK END");
                    } else {
                        Serial.print(" ERR END");
                    }
                } else {
                    Serial.write("UNK");
                }
                Serial.println("");
            }
            count = 0;
        }
        else {
            buf[count++] = tmp;
        }
    }
    delay(500);
}