/**
 ******************************************************************************
 * @file           : main.c
 * @author         : Fernando Hermosillo Reynoso
 * @brief          : Main program body
 ******************************************************************************
 */

#include <stdint.h>
#include "stm32f103_hal.h"


/* Variables --------------------------------------*/




/* Funciones privadas -----------------------------*/
void delay_ms(uint16_t ms) {
	volatile unsigned long t = 0;
	for(uint16_t i = 0; i < ms; i++)
	{
		for(t = 0; t < 800; t++);
	}
}

void delay_us(uint16_t us)
{
	for (volatile unsigned int cycles = 0; cycles < us; cycles++);
}



/* Codigo principal -------------------------------*/
int main(void)
{
	// RCC config
	rcc_clock_enable(RCC_TIM3);
	rcc_clock_enable(RCC_GPIOA);

	/* PWM Config */
	// Fclk=8MHz
	// PSC=7
	// Ftim=Fclk/(PSC + 1) = 1MHz -> 1us
	// F=1000Hz -> T = 1ms = 1000us
	// TIM config (Frequency of 1000Hz with ticks of 1us/1MHz)
	timer_init(TIM3, TIMER_MODE_UP, 999, 7);	// ARR=999, PSC=7
	timer_set_oc_channel(
								TIM3, 									// TIMER3
								TIMER_CHANNEL_1,				// T3C1 (PA6)
								TIMER_OC_PWM1,					// OC Mode: PWM1
								TIMER_OC_POLARITY_HIGH,	// Polarity: Active high
								500,										// CCR1=500 (CCR1 <= ARR)
								true);									// Output enabled
	timer_start(TIM3, TIMER_CONTINUOUS);

	// Loop
	/* Change duty cycle to 
	 * 1000 * CCR1/(ARR+1) = 100 * 250/1000 = 25%
	 */	
	timer_set_compare_value(TIM3, TIMER_CHANNEL_1, 250);
	//TIM3->CCR1 = 250; 
	while (1)
	{
	}
}