/* Reflow Oven Controller
 *
 * Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
 *
 * This file is part of the Reflow Oven Controller Project.
 *
 * The reflow oven controller 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.
 *
 * The Reflow Oven Control Firmware 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 the reflow oven controller project.
 * If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @addtogroup oven-driver
 * @{
 */

#include <reflow-controller/oven-driver.h>
#include <reflow-controller/periph-config/oven-driver-hwcfg.h>
#include <stm-periph/rcc-manager.h>
#include <reflow-controller/systick.h>
#include <reflow-controller/adc-meas.h>
#include <reflow-controller/temp-converter.h>
#include <helper-macros/helper-macros.h>
#include <reflow-controller/safety/safety-controller.h>
#include <reflow-controller/hw-version-detect.h>

/**
 * @brief PID ontroller instance of the oven driver
 */
static struct pid_controller IN_SECTION(.ccm.bss) oven_pid;

/**
 * @brief Oven PID is currently running
 */
static bool oven_pid_running;

/**
 * @brief Oven PID has been aborted / abnormally stopped.
 */
static bool oven_pid_aborted;

/**
 * @brief Power level [0..100] of the oven to be applied
 */
static uint8_t IN_SECTION(.ccm.bss) oven_driver_power_level;

/**
 * @brief Current target temperature of the oven PID controller in degC
 */
static float IN_SECTION(.ccm.bss) target_temp;

/**
 * @brief The millisecond timestamp of the last run of the PID controller
 */
static uint64_t IN_SECTION(.ccm.bss) timestamp_last_run;

/**
 * @brief Enable or disable the safety enable line of the oven control relay.
 * @param enable
 * @note This function is only working for hardware revisions >= v1.3. Below,
 * the safety enable is unavailable.
 */
static void ssr_safety_en(bool enable)
{
	if (get_pcb_hardware_version() >= HW_REV_V1_3) {
		if (enable)
			SSR_SAFETY_EN_PORT->ODR |= (1<<SSR_SAFETY_EN_PIN);
		else
			SSR_SAFETY_EN_PORT->ODR &= ~(1<<SSR_SAFETY_EN_PIN);

	}
}

void oven_driver_init(void)
{
	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_PORT_RCC_MASK));
	rcc_manager_enable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_TIM_RCC_MASK));

	OVEN_CONTROLLER_PORT->MODER &= MODER_DELETE(OVEN_CONTROLLER_PIN);
	OVEN_CONTROLLER_PORT->MODER |= ALTFUNC(OVEN_CONTROLLER_PIN);
	SETAF(OVEN_CONTROLLER_PORT, OVEN_CONTROLLER_PIN, OVEN_CONTROLLER_PIN_ALTFUNC);

	OVEN_CONTROLLER_PWM_TIMER->CR2 = 0UL;

	OVEN_CONTROLLER_PWM_TIMER->CCMR2 = TIM_CCMR2_OC3M;
	OVEN_CONTROLLER_PWM_TIMER->CCER = TIM_CCER_CC3E | TIM_CCER_CC3P;

	OVEN_CONTROLLER_PWM_TIMER->ARR = 1000U;
	OVEN_CONTROLLER_PWM_TIMER->PSC = 42000U - 1U;

	OVEN_CONTROLLER_PWM_TIMER->CR1 = TIM_CR1_CMS | TIM_CR1_CEN;

	/* Explicitly init global variables */
	oven_pid_aborted = false;
	oven_pid_running = false;

	if (get_pcb_hardware_version() >= HW_REV_V1_3) {
		/* Init the safety SSR enable signal */
		rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(SSR_SAFETY_EN_PORT_RCC_MASK));
		SSR_SAFETY_EN_PORT->MODER &= MODER_DELETE(SSR_SAFETY_EN_PIN);
		SSR_SAFETY_EN_PORT->MODER |= OUTPUT(SSR_SAFETY_EN_PIN);
		ssr_safety_en(false);
	}

	oven_driver_set_power(0U);
	oven_driver_apply_power_level();
}

void oven_driver_set_power(uint8_t power)
{
	if (power > 100U)
		power = 100U;

	oven_driver_power_level = power;
}

void oven_driver_apply_power_level(void)
{
	OVEN_CONTROLLER_PWM_TIMER->CCR3 = oven_driver_power_level * 10;
}

void oven_driver_disable(void)
{
	OVEN_CONTROLLER_PWM_TIMER->CR1 = 0UL;
	OVEN_CONTROLLER_PWM_TIMER->CR2 = 0UL;
	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_PORT_RCC_MASK));
	rcc_manager_disable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_TIM_RCC_MASK));
}

void oven_pid_init(struct pid_controller *controller_to_copy)
{
	pid_copy(&oven_pid, controller_to_copy);
	oven_pid.output_sat_min = 0.0f;
	oven_pid.output_sat_max = 100.0f;

	oven_pid_running = true;
	oven_pid_aborted = false;
	safety_controller_report_timing(ERR_TIMING_PID);
	timestamp_last_run = systick_get_global_tick();
	ssr_safety_en(true);
}

void oven_pid_set_target_temperature(float temp)
{
	target_temp = temp;
}

void oven_pid_handle(void)
{
	float pid_out;
	float current_temp;

	if (oven_pid_running && !oven_pid_aborted) {
		if (systick_ticks_have_passed(timestamp_last_run, (uint64_t)(oven_pid.sample_period * 1000))) {
			/* No need to check. Safety controller will monitor this */
			(void)adc_pt1000_get_current_resistance(&current_temp);
			(void)temp_converter_convert_resistance_to_temp(current_temp, &current_temp);

			pid_out = pid_sample(&oven_pid, target_temp - current_temp);
			oven_driver_set_power((uint8_t)pid_out);
			timestamp_last_run = systick_get_global_tick();

			safety_controller_report_timing(ERR_TIMING_PID);
		}
	}
}

void oven_pid_stop(void)
{
	oven_pid_running = false;
	oven_driver_set_power(0U);
	safety_controller_enable_timing_mon(ERR_TIMING_PID, false);
	ssr_safety_en(false);
}

void oven_pid_abort(void)
{
	oven_pid_aborted = true;
	oven_pid_stop();
}

enum oven_pid_status oven_pid_get_status(void)
{
	enum oven_pid_status ret = OVEN_PID_ABORTED;

	if (oven_pid_running && !oven_pid_aborted)
		ret = OVEN_PID_RUNNING;
	else if (!oven_pid_running && !oven_pid_aborted)
		ret = OVEN_PID_DEACTIVATED;

	return ret;
}

/** @} */