/*
 *  tim2.c
 *
 *  Created on: Dec 30, 2023
 *  Author: Francesco Gritti
 *
 *  This file contains implementation of booth timer 2 input capture and PWM
 *  generation features. only one of the two features can be enabled by
 *  defining the macros "tim2_pwm" or "tim2_ic".
 *
 *  GPIOs connected to the input/output channels of the timer should be
 *  defined in main.h and they are initialized into the TIM2_init function
 */


#include "main.h"
#include "mcu.h"




#ifdef tim2_adc_timebase



void TIM2_init (void) {

	RCC_TIM2_CLK_ENABLE();


	TIM2->CR1 = 0x0000;
	TIM2->CR2 = (0b010 << TIM_CR2_MMS_Pos);
	TIM2->DIER = 0x0000;	// disable all interrupt requests

	TIM2->PSC = TIM2_PSC;
	TIM2->ARR = TIM2_PERIOD;


	TIM2->CR1 |= TIM_CR1_CEN;
}


#endif




#ifdef tim2_pwm

void TIM2_pwm_config_ch1 (TIM_OC_ACTIVE_STATE_enum activeState, u16 value) {
	TIM2->CCMR1 = (TIM_FORCE_INACTIVE << TIM_CCMR1_OC1M_Pos) | TIM_CCMR1_OC1PE;

	if (activeState == TIM_OC_ACTIVE_HIGH)
		TIM_PWM_SET_CH1_POLARITY_ACTIVE_HIGH (TIM2);
	else
		TIM_PWM_SET_CH1_POLARITY_ACTIVE_LOW (TIM2);

	TIM2->CCR1 = value;
	TIM_CH1_FORCE_INACTIVE(TIM2);
	TIM_CH1_ENABLE(TIM2);
}

void TIM2_pwm_config_ch2 (TIM_OC_ACTIVE_STATE_enum activeState, u16 value) {
	TIM2->CCMR1 = (TIM_FORCE_INACTIVE << TIM_CCMR1_OC2M_Pos) | TIM_CCMR1_OC2PE;

	if (activeState == TIM_OC_ACTIVE_HIGH)
		TIM_PWM_SET_CH2_POLARITY_ACTIVE_HIGH (TIM2);
	else
		TIM_PWM_SET_CH2_POLARITY_ACTIVE_LOW (TIM2);

	TIM2->CCR2 = value;
	TIM_CH2_FORCE_INACTIVE(TIM2);
	TIM_CH2_ENABLE(TIM2);
}

void TIM2_pwm_config_ch3 (TIM_OC_ACTIVE_STATE_enum activeState, u16 value) {
	TIM2->CCMR2 = (TIM_FORCE_INACTIVE << TIM_CCMR2_OC3M_Pos) | TIM_CCMR2_OC3PE;

	if (activeState == TIM_OC_ACTIVE_HIGH)
		TIM_PWM_SET_CH3_POLARITY_ACTIVE_HIGH (TIM2);
	else
		TIM_PWM_SET_CH3_POLARITY_ACTIVE_LOW (TIM2);

	TIM2->CCR3 = value;
	TIM_CH3_ENABLE(TIM2);
}

void TIM2_pwm_config_ch4 (TIM_OC_ACTIVE_STATE_enum activeState, u16 value) {
	TIM2->CCMR2 = (TIM_FORCE_INACTIVE << TIM_CCMR2_OC4M_Pos) | TIM_CCMR2_OC4PE;

	if (activeState == TIM_OC_ACTIVE_HIGH)
		TIM_PWM_SET_CH4_POLARITY_ACTIVE_HIGH (TIM2);
	else
		TIM_PWM_SET_CH4_POLARITY_ACTIVE_LOW (TIM2);

	TIM2->CCR4 = value;
	TIM_CH4_ENABLE(TIM2);
}

void TIM2_pwm_init (void) {

	RCC_TIM2_CLK_ENABLE ();

	TIM2->CR1 = 0x0000;
	TIM2->CR2 = 0x0000;
	TIM2->SMCR = 0x0000;
	TIM2->DIER = 0x0000;

	// disable all channels
	TIM2->CCER = 0x0000;

	// force CH1 and CH2 inactive, enable compare PRELOAD
	TIM2->CCMR1 = 0x0000;
	TIM2->CCMR2 = 0x0000;
	// reset counter
	TIM2->CNT = 0x0000;
	//set PRESCALER
	TIM2->PSC = TIM2_PSC;
	// set PERIOD
	TIM2->ARR = TIM2_PERIOD;

	// reset all PWM periods
	TIM2->CCR1 = 0x0000;
	TIM2->CCR2 = 0x0000;
	TIM2->CCR3 = 0x0000;
	TIM2->CCR4 = 0x0000;

	TIM_COUNTER_ENABLE (TIM2);
}

	/*GPIO_AF_PP (TIM2_PWM_CH1);
	GPIO_AF_PP (TIM2_PWM_CH2);
	GPIO_AF_PP (TIM2_PWM_CH3);
	GPIO_AF_PP (TIM2_PWM_CH4);

	GPIO_SET_AFRL (TIM2_PWM_CH1, GPIO_AF_TIM2);
	GPIO_SET_AFRL (TIM2_PWM_CH2, GPIO_AF_TIM2);
	GPIO_SET_AFRL (TIM2_PWM_CH3, GPIO_AF_TIM2);
	GPIO_SET_AFRL (TIM2_PWM_CH4, GPIO_AF_TIM2);*/



#elif defined(tim2_ic)

void TIM2_init(void) {

	RCC_TIM2_CLK_ENABLE();
	RCC_GPIOA_CLK_ENABLE();


	/* =============== configure GPIO ================*/

	GPIO_AF_PP (TIM2_IN_CH2);
	GPIO_SET_AFRL (TIM2_IN_CH2, 0x02);


	/* ====== configure timer capture channels ======*/

	// configure channel 2 as input capture with filter 3
	TIM2->CCMR1 = (3 << TIM_CCMR1_IC2F_Pos) | (0b01 << TIM_CCMR1_CC2S_Pos);
	// capture on falling edge only, enable channel
	TIM2->CCER = TIM_CCER_CC2P | TIM_CCER_CC2E;

	/* Configure base timer */

	// enable interrupt on timer update and on channel2 input capture
	TIM2->DIER = TIM_DIER_UIE | TIM_DIER_CC2IE;

	TIM2->PSC = TIM2_PSC; 		// 54;
	TIM2->ARR = TIM2_PERIOD; 	// 65535;

	// request UEV event only on underflow/overflow and enable timer
	TIM2->CR1 = TIM_CR1_URS | TIM_CR1_CEN;

	// set highest priority since the handler is a non blocking function
	NVIC_SetPriority(TIM2_IRQn, 0);
	NVIC_EnableIRQ(TIM2_IRQn);
}



__attribute__ ((weak)) void TIM2_IRQHandler (void) {

	// clear IT flag
}


#endif