/*!
    \file  main.c
    \brief TIMER1 PWM output demo
*/

/*
    Copyright (C) 2017 GigaDevice

    2014-12-26, V1.0.0, platform GD32F1x0(x=3,5)
    2016-01-15, V2.0.0, platform GD32F1x0(x=3,5,7,9)
    2016-04-30, V3.0.0, firmware update for GD32F1x0(x=3,5,7,9)
    2017-06-19, V3.1.0, firmware update for GD32F1x0(x=3,5,7,9)
*/

#include "gd32f1x0.h"
#include <stdio.h>
#include "gd32f1x0_eval.h"

void gpio_config(void);
void timer_config(void);

/**
    \brief      configure the GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
  */
void gpio_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);
    
    /*configure PB3 PB10 PB11(TIMER1 CH1 CH2 CH3) as alternate function*/
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_3);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_3);

    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_10);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_10);

    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_11);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_11);

    gpio_af_set(GPIOB, GPIO_AF_2, GPIO_PIN_3);
    gpio_af_set(GPIOB, GPIO_AF_2, GPIO_PIN_10);
    gpio_af_set(GPIOB, GPIO_AF_2, GPIO_PIN_11);
}

/**
    \brief      configure the TIMER peripheral
    \param[in]  none
    \param[out] none
    \retval     none
  */
void timer_config(void)
{
    /* -----------------------------------------------------------------------
    TIMER1 configuration: generate 3 PWM signals with 3 different duty cycles:
    TIMER1CLK = SystemCoreClock / 72 = 1MHz

    TIMER1 channel 1 duty cycle = (4000/ 16000)* 100  = 25%
    TIMER1 channel 2 duty cycle = (8000/ 16000)* 100  = 50%
    TIMER1 channel 3 duty cycle = (12000/ 16000)* 100 = 75%
    ----------------------------------------------------------------------- */
    timer_oc_parameter_struct timer_ocintpara;
    timer_parameter_struct timer_initpara;

    rcu_periph_clock_enable(RCU_TIMER1);

    timer_deinit(TIMER1);

    /* TIMER1 configuration */
    timer_initpara.prescaler         = 71;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 15999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER1,&timer_initpara);

    /* CH1, CH2 and CH3 configuration in PWM0 mode */
    timer_ocintpara.ocpolarity  = TIMER_OC_POLARITY_HIGH;
    timer_ocintpara.outputstate = TIMER_CCX_ENABLE;

    timer_channel_output_config(TIMER1, TIMER_CH_1, &timer_ocintpara);
    timer_channel_output_config(TIMER1, TIMER_CH_2, &timer_ocintpara);
    timer_channel_output_config(TIMER1, TIMER_CH_3, &timer_ocintpara);

    /* CH1 configuration in PWM mode1,duty cycle 25% */
    timer_channel_output_pulse_value_config(TIMER1, TIMER_CH_1, 3999);
    timer_channel_output_mode_config(TIMER1, TIMER_CH_1, TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER1, TIMER_CH_1, TIMER_OC_SHADOW_DISABLE);

    /* CH2 configuration in PWM mode1,duty cycle 50% */
    timer_channel_output_pulse_value_config(TIMER1, TIMER_CH_2, 7999);
    timer_channel_output_mode_config(TIMER1, TIMER_CH_2, TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER1, TIMER_CH_2, TIMER_OC_SHADOW_DISABLE);

    /* CH3 configuration in PWM mode1,duty cycle 75% */
    timer_channel_output_pulse_value_config(TIMER1, TIMER_CH_3, 11999);
    timer_channel_output_mode_config(TIMER1, TIMER_CH_3, TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER1, TIMER_CH_3, TIMER_OC_SHADOW_DISABLE);

    /* auto-reload preload enable */
    timer_auto_reload_shadow_enable(TIMER1);
    /* auto-reload preload enable */
    timer_enable(TIMER1);
}

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    gpio_config();
    timer_config();

    while (1);
}
