/**
 * Marlin 3D Printer Firmware
 *
 * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
 * Copyright (c) 2017 Victor Perez
 *
 * 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/>.
 *
 */

#ifndef _HAL_TIMERS_STM32F4_H
#define _HAL_TIMERS_STM32F4_H

// --------------------------------------------------------------------------
// Includes
// --------------------------------------------------------------------------

#include <stdint.h>

// --------------------------------------------------------------------------
// Defines
// --------------------------------------------------------------------------

#define FORCE_INLINE __attribute__((always_inline)) inline

#define hal_timer_t uint32_t  // TODO: One is 16-bit, one 32-bit - does this need to be checked?
#define HAL_TIMER_TYPE_MAX 0xFFFF

#define HAL_TIMER_RATE         (HAL_RCC_GetSysClockFreq() / 2)  // frequency of timer peripherals

#define STEP_TIMER_NUM 0  // index of timer to use for stepper
#define TEMP_TIMER_NUM 1  // index of timer to use for temperature
#define PULSE_TIMER_NUM STEP_TIMER_NUM

#define TEMP_TIMER_PRESCALE     1000 // prescaler for setting Temp timer, 72Khz
#define TEMP_TIMER_FREQUENCY    1000 // temperature interrupt frequency

#define STEPPER_TIMER_PRESCALE 54 // was 40,prescaler for setting stepper timer, 2Mhz
#define STEPPER_TIMER_RATE     (HAL_TIMER_RATE / STEPPER_TIMER_PRESCALE)   // frequency of stepper timer
#define STEPPER_TIMER_TICKS_PER_US ((STEPPER_TIMER_RATE) / 1000000) // stepper timer ticks per µs

#define PULSE_TIMER_RATE       STEPPER_TIMER_RATE   // frequency of pulse timer
#define PULSE_TIMER_PRESCALE   STEPPER_TIMER_PRESCALE
#define PULSE_TIMER_TICKS_PER_US STEPPER_TIMER_TICKS_PER_US

#define ENABLE_STEPPER_DRIVER_INTERRUPT() HAL_timer_enable_interrupt(STEP_TIMER_NUM)
#define DISABLE_STEPPER_DRIVER_INTERRUPT() HAL_timer_disable_interrupt(STEP_TIMER_NUM)
#define STEPPER_ISR_ENABLED() HAL_timer_interrupt_enabled(STEP_TIMER_NUM)

#define ENABLE_TEMPERATURE_INTERRUPT() HAL_timer_enable_interrupt(TEMP_TIMER_NUM)
#define DISABLE_TEMPERATURE_INTERRUPT() HAL_timer_disable_interrupt(TEMP_TIMER_NUM)

// TODO change this

#ifdef STM32GENERIC
  extern void TC5_Handler();
  extern void TC7_Handler();
  #define HAL_STEP_TIMER_ISR void TC5_Handler()
  #define HAL_TEMP_TIMER_ISR void TC7_Handler()
#else
  extern void TC5_Handler(stimer_t *htim);
  extern void TC7_Handler(stimer_t *htim);
  #define HAL_STEP_TIMER_ISR void TC5_Handler(stimer_t *htim)
  #define HAL_TEMP_TIMER_ISR void TC7_Handler(stimer_t *htim)
#endif


// --------------------------------------------------------------------------
// Types
// --------------------------------------------------------------------------

#ifdef STM32GENERIC
  typedef struct {
    TIM_HandleTypeDef handle;
    uint32_t callback;
  } tTimerConfig;
  typedef tTimerConfig stm32f4_timer_t;
#else
  typedef stimer_t stm32f4_timer_t;
#endif

// --------------------------------------------------------------------------
// Public Variables
// --------------------------------------------------------------------------

extern stm32f4_timer_t TimerHandle[];

// --------------------------------------------------------------------------
// Public functions
// --------------------------------------------------------------------------

void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency);
void HAL_timer_enable_interrupt(const uint8_t timer_num);
void HAL_timer_disable_interrupt(const uint8_t timer_num);
bool HAL_timer_interrupt_enabled(const uint8_t timer_num);

FORCE_INLINE static uint32_t HAL_timer_get_count(const uint8_t timer_num) {
  return __HAL_TIM_GET_COUNTER(&TimerHandle[timer_num].handle);
}

FORCE_INLINE static void HAL_timer_set_compare(const uint8_t timer_num, const uint32_t compare) {
  __HAL_TIM_SET_AUTORELOAD(&TimerHandle[timer_num].handle, compare);
  if (HAL_timer_get_count(timer_num) >= compare)
    TimerHandle[timer_num].handle.Instance->EGR |= TIM_EGR_UG; // Generate an immediate update interrupt
}

FORCE_INLINE static hal_timer_t HAL_timer_get_compare(const uint8_t timer_num) {
  return __HAL_TIM_GET_AUTORELOAD(&TimerHandle[timer_num].handle);
}

#ifdef STM32GENERIC
  FORCE_INLINE static void HAL_timer_isr_prologue(const uint8_t timer_num) {
    if (__HAL_TIM_GET_FLAG(&TimerHandle[timer_num].handle, TIM_FLAG_UPDATE) == SET)
      __HAL_TIM_CLEAR_FLAG(&TimerHandle[timer_num].handle, TIM_FLAG_UPDATE);
  }
#else
  #define HAL_timer_isr_prologue(TIMER_NUM)
#endif

#define HAL_timer_isr_epilogue(TIMER_NUM)

#endif // _HAL_TIMERS_STM32F4_H