/*!
    \file    main.c
    \brief   TIMER0 6-steps demo for GD32F30x

    \version 2017-02-10, V1.0.0, firmware for GD32F30x
    \version 2018-10-10, V1.1.0, firmware for GD32F30x
    \version 2018-12-25, V2.0.0, firmware for GD32F30x
    \version 2020-09-30, V2.1.0, firmware for GD32F30x
*/

/*
    Copyright (c) 2020, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

#include "gd32f30x.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
#include "systick.h"

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

/*!
    \brief      configure the GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
*/
void gpio_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_GPIOB);
    rcu_periph_clock_enable(RCU_AF);

    /*configure PA8 PA9 PA10(TIMER0 CH0 CH1 CH2) as alternate function*/
    gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_8);
    gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_9);
    gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_10);

    /*configure PB13 PB14 PB15(TIMER0 CH0N CH1N CH2N) as alternate function*/
    gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_13);
    gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_14);
    gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_15);

    /*configure PB12(TIMER0 BKIN) as alternate function*/
    gpio_init(GPIOB,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_50MHZ,GPIO_PIN_12);
}

/*!
    \brief      configure the nested vectored interrupt controller
    \param[in]  none
    \param[out] none
    \retval     none
*/
void nvic_config(void)
{
#ifndef GD32F30X_HD
    nvic_irq_enable(TIMER0_TRG_CMT_TIMER10_IRQn, 0, 1);
#else
    nvic_irq_enable(TIMER0_TRG_CMT_IRQn, 0, 1);
#endif
}

/*!
    \brief      configure the TIMER peripheral
    \param[in]  none
    \param[out] none
    \retval     none
*/
void timer_config(void)
{
    /* -----------------------------------------------------------------------
    TIMER0 configuration:
    generate 3 complementary PWM signal.
    TIMER0CLK is fixed to systemcoreclock, the TIMER0 prescaler is equal to 119 
    so the TIMER0 counter clock used is 1MHz.
    insert a dead time equal to 200/systemcoreclock =1.67us 
    configure the break feature, active at low level, and using the automatic
    output enable feature.
    use the locking parameters level 0.
    ----------------------------------------------------------------------- */
    timer_oc_parameter_struct timer_ocintpara;
    timer_parameter_struct timer_initpara;
    timer_break_parameter_struct timer_breakpara;

    rcu_periph_clock_enable(RCU_TIMER0);

    timer_deinit(TIMER0);

    /* TIMER0 configuration */
    timer_initpara.prescaler         = 119;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 599;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER0,&timer_initpara);

     /* CH0/CH0N,CH1/CH1N and CH2/CH2N configuration in timing mode */
    timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;
    timer_ocintpara.outputnstate = TIMER_CCXN_ENABLE;
    timer_ocintpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;
    timer_ocintpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
    timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_HIGH;
    timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_HIGH;

    timer_channel_output_config(TIMER0,TIMER_CH_0,&timer_ocintpara);
    timer_channel_output_config(TIMER0,TIMER_CH_1,&timer_ocintpara);
    timer_channel_output_config(TIMER0,TIMER_CH_2,&timer_ocintpara);

    timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_0,299);
    timer_channel_output_mode_config(TIMER0,TIMER_CH_0,TIMER_OC_MODE_TIMING);
    timer_channel_output_shadow_config(TIMER0,TIMER_CH_0,TIMER_OC_SHADOW_ENABLE);

    timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_1,299);
    timer_channel_output_mode_config(TIMER0,TIMER_CH_1,TIMER_OC_MODE_TIMING);
    timer_channel_output_shadow_config(TIMER0,TIMER_CH_1,TIMER_OC_SHADOW_ENABLE);

    timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_2,299);
    timer_channel_output_mode_config(TIMER0,TIMER_CH_2,TIMER_OC_MODE_TIMING);
    timer_channel_output_shadow_config(TIMER0,TIMER_CH_2,TIMER_OC_SHADOW_ENABLE);


    /* automatic output enable, break, dead time and lock configuration*/
    timer_breakpara.runoffstate      = TIMER_ROS_STATE_ENABLE;
    timer_breakpara.ideloffstate     = TIMER_IOS_STATE_ENABLE ;
    timer_breakpara.deadtime         = 164;
    timer_breakpara.breakpolarity    = TIMER_BREAK_POLARITY_LOW;
    timer_breakpara.outputautostate  = TIMER_OUTAUTO_ENABLE;
    timer_breakpara.protectmode      = TIMER_CCHP_PROT_OFF;
    timer_breakpara.breakstate       = TIMER_BREAK_DISABLE;
    timer_break_config(TIMER0,&timer_breakpara);
    
    /* TIMER0 primary output function enable */
    timer_primary_output_config(TIMER0,ENABLE);

    /* TIMER0 channel control update interrupt enable */
    timer_interrupt_enable(TIMER0,TIMER_INT_CMT);
    /* TIMER0 break interrupt disable */
    timer_interrupt_disable(TIMER0,TIMER_INT_BRK);

    /* TIMER0 counter enable */
    timer_enable(TIMER0);
}

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

    while (1);
}