RIOT/tests/periph/gpio_arduino/main.sketch

/*
 * Copyright (C) 2018 Tom Keddie
 *
 * 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       Manual test application for GPIO peripheral drivers using
 *              Arduino pin numbering
 *
 * @author      Tom Keddie <github@bronwenandtom.com>
 *
 * @}
 */

#include <stdio.h>
#include <stdlib.h>

#include "shell.h"
#include "periph/gpio.h"

#define ARDUINO_PIN_NUMOF ((int)(sizeof(arduino_pinmap)/sizeof(arduino_pinmap[0])))

static int get_digital_pin(const char* pinstring)
{
    int arduino_pin = -1;
    char *endptr  = NULL;

    if (*pinstring == 'A') {
        /* TODO : add analogInputToDigitalPin macro to arduino_board.h for all boards */
        return -1;
    }

    arduino_pin = strtol(pinstring, &endptr, 0);
    /* strtol returns 0 on error, manual check for pin 0, works for 0 but not
       00 etc, this will have to be acceptable */
    if (arduino_pin == 0 && (pinstring[0] != '0' || pinstring[1] != '\0'))
        arduino_pin = -1;

    if ((*endptr != '\0') || (arduino_pin == -1) || (arduino_pin > ARDUINO_PIN_NUMOF)) {
        return -1;
    }

    return arduino_pin;
}

static int init_pin(int argc, char **argv, int mode)
{
    int pin;

    if (argc < 2) {
        printf("usage: %s <pin>\n", argv[0]);
        return 1;
    }

    pin = get_digital_pin(argv[1]);
    if (pin < 0) {
        printf("Could not map Arduino pin %s to a gpio.\nExpected numeric pin number.\n", argv[1]);
        return 1;
    }

    pinMode(pin, mode);

    return 0;
}

static int init_out(int argc, char **argv)
{
    return init_pin(argc, argv, OUTPUT);
}

static int init_in(int argc, char **argv)
{
    return init_pin(argc, argv, INPUT);
}

static int init_in_pu(int argc, char **argv)
{
    return init_pin(argc, argv, INPUT_PULLUP);
}

static int read(int argc, char **argv)
{
    int pin;

    if (argc < 2) {
        printf("usage: %s <pin>\n", argv[0]);
        return 1;
    }

    pin = get_digital_pin(argv[1]);
    if (pin < 0) {
        printf("Could not map Arduino pin %s to a gpio.\nExpected numeric pin number.\n", argv[1]);
        return 1;
    }

    if (digitalRead(pin)) {
        printf("ARDUINO_PIN(%i) is HIGH\n", pin);
    }
    else {
        printf("ARDUINO_PIN(%i) is LOW\n", pin);
    }

    return 0;
}

static int set(int argc, char **argv)
{
    int pin;

    if (argc < 2) {
        printf("usage: %s <pin>\n", argv[0]);
        return 1;
    }

    pin = get_digital_pin(argv[1]);
    if (pin < 0) {
        printf("Could not map Arduino pin %s to a gpio.\nExpected numeric pin number.\n", argv[1]);
        return 1;
    }

    digitalWrite(pin, 1);

    return 0;
}

static int clear(int argc, char **argv)
{
    int pin;

    if (argc < 2) {
        printf("usage: %s <pin>\n", argv[0]);
        return 1;
    }

    pin = get_digital_pin(argv[1]);
    if (pin < 0) {
        printf("Could not map Arduino pin %s to a gpio.\nExpected numeric pin number.\n", argv[1]);
        return 1;
    }

    digitalWrite(pin, 0);

    return 0;
}

static int toggle(int argc, char **argv)
{
    int pin;

    if (argc < 2) {
        printf("usage: %s <pin>\n", argv[0]);
        return 1;
    }

    pin = get_digital_pin(argv[1]);
    if (pin < 0) {
        printf("Could not map Arduino pin %s to a gpio.\nExpected numeric pin number.\n", argv[1]);
        return 1;
    }

    /* not thread safe but Arduino doesn't promise such things */
    if (digitalRead(pin)) {
        digitalWrite(pin, 0);
    }
    else {
        digitalWrite(pin, 1);
    }

    return 0;
}

static const shell_command_t shell_commands[] = {
    { "init_out", "init as output (push-pull mode)", init_out },
    { "init_in", "init as input w/o pull resistor", init_in },
    { "init_in_pu", "init as input with pull-up", init_in_pu },
    { "read", "read pin status", read },
    { "set", "set pin to HIGH", set },
    { "clear", "set pin to LOW", clear },
    { "toggle", "toggle pin", toggle },
    { NULL, NULL, NULL }
};

void setup(void)
{
    puts("Arduino GPIO peripheral driver test. ? for help");

    /* start the shell */
    char line_buf[SHELL_DEFAULT_BUFSIZE];
    shell_run(shell_commands, line_buf, SHELL_DEFAULT_BUFSIZE);
}

void loop(void)
{
}