/*
 * Copyright (C) OpenTX
 *
 * Based on code named
 *   th9x - http://code.google.com/p/th9x
 *   er9x - http://code.google.com/p/er9x
 *   gruvin9x - http://code.google.com/p/gruvin9x
 *
 * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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.
 */

#include "opentx.h"

void backlightInit()
{
  // PIN init
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = BACKLIGHT_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(BACKLIGHT_GPIO, &GPIO_InitStructure);
  GPIO_PinAFConfig(BACKLIGHT_GPIO, BACKLIGHT_GPIO_PinSource, BACKLIGHT_GPIO_AF);

  // TIMER init
#if defined(PCBX12S)
  if (IS_HORUS_PROD()) {
    BACKLIGHT_TIMER->ARR = 100;
    BACKLIGHT_TIMER->PSC = BACKLIGHT_TIMER_FREQ / 10000 - 1; // 1kHz
    BACKLIGHT_TIMER->CCMR2 = TIM_CCMR2_OC4M_1 | TIM_CCMR2_OC4M_2; // PWM
    BACKLIGHT_TIMER->CCER = TIM_CCER_CC4E;
    BACKLIGHT_TIMER->CCR4 = 0;
    BACKLIGHT_TIMER->EGR = 0;
    BACKLIGHT_TIMER->CR1 = TIM_CR1_CEN; // Counter enable
  }
  else {
    BACKLIGHT_TIMER->ARR = 100;
    BACKLIGHT_TIMER->PSC = BACKLIGHT_TIMER_FREQ / 10000 - 1; // 1kHz
    BACKLIGHT_TIMER->CCMR1 = TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1M_2; // PWM
    BACKLIGHT_TIMER->CCER = TIM_CCER_CC1E | TIM_CCER_CC1NE;
    BACKLIGHT_TIMER->CCR1 = 100;
    BACKLIGHT_TIMER->EGR = 1;
    BACKLIGHT_TIMER->CR1 |= TIM_CR1_CEN; // Counter enable
    BACKLIGHT_TIMER->BDTR |= TIM_BDTR_MOE;
  }
#elif defined(PCBX10)
  BACKLIGHT_TIMER->ARR = 100;
  BACKLIGHT_TIMER->PSC = BACKLIGHT_TIMER_FREQ / 1000000 - 1; // 10kHz (same as FrOS)
  BACKLIGHT_TIMER->CCMR2 = TIM_CCMR2_OC3M_1 | TIM_CCMR2_OC3M_2 | TIM_CCMR2_OC3PE; // PWM mode 1
  BACKLIGHT_TIMER->CCER = TIM_CCER_CC3E | TIM_CCER_CC3NE;
  BACKLIGHT_TIMER->CCR3 = 100;
  BACKLIGHT_TIMER->EGR = TIM_EGR_UG;
  BACKLIGHT_TIMER->CR1 |= TIM_CR1_CEN; // Counter enable
  BACKLIGHT_TIMER->BDTR |= TIM_BDTR_MOE;
#endif
}

void backlightEnable(uint8_t dutyCycle)
{
#if defined(PCBX12S)
  if (IS_HORUS_PROD()) {
    BACKLIGHT_TIMER->CCR4 = dutyCycle;
  }
  else {
    BACKLIGHT_TIMER->CCR1 = BACKLIGHT_LEVEL_MAX - dutyCycle;
  }
#elif defined(PCBX10)
  BACKLIGHT_TIMER->CCR3 = BACKLIGHT_LEVEL_MAX - dutyCycle;
#endif

  if (dutyCycle == 0) {
    BACKLIGHT_TIMER->BDTR &= ~TIM_BDTR_MOE;
  }
  else if ((BACKLIGHT_TIMER->BDTR & TIM_BDTR_MOE) == 0) {
    BACKLIGHT_TIMER->BDTR |= TIM_BDTR_MOE;
  }
}