/*!
    \file  main.c
    \brief TIMER1 oc toggle demo
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

#include "gd32f3x0.h"
#include <stdio.h>
#include "gd32f3x0_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(TIMER1 CH1) 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_af_set(GPIOB, GPIO_AF_2, GPIO_PIN_3);
}

/*!
    \brief      configure the timer peripheral
    \param[in]  none
    \param[out] none
    \retval     none
  */
void timer_config(void)
{
    /* ---------------------------------------------------------------------------
    TIMER1 configuration: output compare toggle mode:
    TIMER1CLK is 2K,
    CH1 update rate = TIMER1 counter clock / CH2CC = 2000/4000 = 0.5 Hz
    ----------------------------------------------------------------------------*/
    timer_oc_parameter_struct timer_ocintpara;
    timer_parameter_struct timer_initpara;

    rcu_periph_clock_enable(RCU_TIMER1);

    timer_deinit(TIMER1);

    /* TIMER1 configuration */
#ifdef GD32F330
    timer_initpara.prescaler         = 41999;
#endif /* GD32F330 */
#ifdef GD32F350
    timer_initpara.prescaler         = 53999;
#endif /* GD32F350 */
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 3999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER1,&timer_initpara);

     /* CH1 configuration in OC TOGGLE 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_pulse_value_config(TIMER1,TIMER_CH_1,3999);
    timer_channel_output_mode_config(TIMER1,TIMER_CH_1,TIMER_OC_MODE_TOGGLE);
    timer_channel_output_shadow_config(TIMER1,TIMER_CH_1,TIMER_OC_SHADOW_DISABLE);

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

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

    while (1);
}
