DiscoLED.cpp

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/*
   Copyright (C) 2016 Mathieu Othacehe. All rights reserved.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <AP_HAL/AP_HAL.h>

#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
#include "DiscoLED.h"

#include <AP_HAL_Linux/Led_Sysfs.h>
#include <AP_HAL_Linux/PWM_Sysfs.h>

#define RED_PWM_INDEX   9
#define GREEN_PWM_INDEX 8
#define BLUE_PWM_INDEX  15

#define DISCO_LED_LOW    0x33
#define DISCO_LED_MEDIUM 0x7F
#define DISCO_LED_HIGH   0xFF
#define DISCO_LED_OFF    0x00

#define DISCO_LED_RED_NAME   "evinrude:red"
#define DISCO_LED_GREEN_NAME "evinrude:green"
#define DISCO_LED_BLUE_NAME  "evinrude:blue"

DiscoLED::DiscoLED():
    RGBLed(DISCO_LED_OFF, DISCO_LED_HIGH, DISCO_LED_MEDIUM, DISCO_LED_LOW),
    red_pwm(RED_PWM_INDEX),
    green_pwm(GREEN_PWM_INDEX),
    blue_pwm(BLUE_PWM_INDEX),

    red_led(DISCO_LED_RED_NAME),
    green_led(DISCO_LED_GREEN_NAME),
    blue_led(DISCO_LED_BLUE_NAME)
{
}

bool DiscoLED::hw_init()
{
    /* If led sysfs api is present, use it, else use pwm sysfs api to
       drive Disco leds */
    if (red_led.init() && green_led.init() && blue_led.init()) {
        backend = LED_SYSFS;
        return true;
    }

    backend = PWM_SYSFS;

    red_pwm_period = red_pwm.get_period();
    green_pwm_period = green_pwm.get_period();
    blue_pwm_period = blue_pwm.get_period();

    red_pwm.init();
    green_pwm.init();
    blue_pwm.init();

    red_pwm.enable(true);
    green_pwm.enable(true);
    blue_pwm.enable(true);

    return true;
}

bool DiscoLED::hw_set_rgb(uint8_t red, uint8_t green, uint8_t blue)
{
    switch (backend) {
    case PWM_SYSFS:
        red_pwm.set_duty_cycle(red / UINT8_MAX * red_pwm_period);
        green_pwm.set_duty_cycle(green / UINT8_MAX * green_pwm_period);
        blue_pwm.set_duty_cycle(blue / UINT8_MAX * blue_pwm_period);
        break;
    case LED_SYSFS:
        red_led.set_brightness(red);
        green_led.set_brightness(green);
        blue_led.set_brightness(blue);
        break;
    default:
        return false;
    }

    return true;
}
#endif