//
// PWM Out: generate PWM waveform to control factory
//

#include "pwmout.h"


// Private variables
static TIM_HandleTypeDef htim17;
static uint32_t last_ssr_on = 0;


// Initialize hardware PWM output
void pwmout_init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    __HAL_RCC_TIM17_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();

    // Configure LED GPIO pins
    GPIO_InitStruct.Pin = SSR_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; //GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    //    GPIO_InitStruct.Alternate = GPIO_AF1_TIM17;
    HAL_GPIO_Init(SSR_GPIO_Port, &GPIO_InitStruct);


    TIM_OC_InitTypeDef sConfigOC;
    TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig;

    htim17.Instance = TIM17;
    htim17.Init.Prescaler = 6000;
    htim17.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim17.Init.Period = 1000;
    htim17.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim17.Init.RepetitionCounter = 0;
    if (HAL_TIM_Base_Init(&htim17) != HAL_OK)
    {
        error_assert(ERR_PERIPHINIT);
    }

    if (HAL_TIM_OC_Init(&htim17) != HAL_OK)
    {
        error_assert(ERR_PERIPHINIT);
    }

    sConfigOC.OCMode = TIM_OCMODE_TOGGLE; //TIM_OCMODE_PWM1;
    sConfigOC.Pulse = 200;
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    sConfigOC.OCNPolarity = TIM_OCNPOLARITY_LOW;
    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
    sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
    sConfigOC.OCNIdleState = TIM_OCIDLESTATE_SET;
    if (HAL_TIM_OC_ConfigChannel(&htim17, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
    {
        error_assert(ERR_PERIPHINIT);
    }

    sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
    sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
    sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
    sBreakDeadTimeConfig.DeadTime = 0;
    sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
    sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
    sBreakDeadTimeConfig.BreakFilter = 0;
    sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
    if (HAL_TIMEx_ConfigBreakDeadTime(&htim17, &sBreakDeadTimeConfig) != HAL_OK)
    {
        error_assert(ERR_PERIPHINIT);
    }

    HAL_NVIC_SetPriority(TIM1_TRG_COM_TIM17_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(TIM1_TRG_COM_TIM17_IRQn);


    HAL_TIM_OC_Start_IT(&htim17, TIM_CHANNEL_1);
    __HAL_TIM_ENABLE_IT(&htim17, TIM_IT_UPDATE);

}


// freaking integral term isn't compatible with both heating and cooling... due to the discard
// functionality. this is a problem.

// also duty cycling isn't working correctly...
void pwmout_process(int16_t duty)
{
    if(duty == 0)
    {
        HAL_GPIO_WritePin(SSR, 0);
        HAL_GPIO_WritePin(LED, 0);
    }
    if(duty < 0)
        duty = 0;


    htim17.Instance->CCR1 = duty; //duty;
}


// Accessor for timer handle
TIM_HandleTypeDef* pwmout_get_tim(void)
{
    return &htim17;
}