GD32F103VET输出PWM波形

GD32F103VET将TIMER0_CH3映射到PE14引脚，使其输出PWM波形。测试时，使用示波器看PE14引脚输出的波形，效果更直观。

TIMER0之PWM输出引脚映射如下:
TIMER0_REMAP[1:0]="00"(没有映射):
TIMER0_CH0默认被映射到PA8引脚
TIMER0_CH1默认被映射到PA9引脚
TIMER0_CH2默认被映射到PA10引脚
TIMER0_CH3默认被映射到PA11引脚

TIMER0_REMAP[1:0]="01"(部分映射):
TIMER0_CH0被映射到PA8引脚
TIMER0_CH1被映射到PA9引脚
TIMER0_CH2被映射到PA10引脚
TIMER0_CH3被映射到PA11引脚

TIMER0_REMAP[1:0]="11"(全映射):
TIMER0_CH0被映射到PE9引脚
TIMER0_CH1被映射到PE11引脚
TIMER0_CH2被映射到PE13引脚
TIMER0_CH3被映射到PE14引脚

测试程序如下：

#include "PWM0.h"

/*
PWM输出引脚映射如下:
TIMER0_REMAP[1:0]="00"(没有映射):
TIMER0_CH0默认被映射到PA8引脚
TIMER0_CH1默认被映射到PA9引脚
TIMER0_CH2默认被映射到PA10引脚
TIMER0_CH3默认被映射到PA11引脚
rcu_periph_clock_enable(RCU_GPIOA);//使能TIMER0_CH0引脚的外设时钟
gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8);

TIMER0_REMAP[1:0]="01"(部分映射):
TIMER0_CH0被映射到PA8引脚
TIMER0_CH1被映射到PA9引脚
TIMER0_CH2被映射到PA10引脚
TIMER0_CH3被映射到PA11引脚
rcu_periph_clock_enable(RCU_AF);		//使能映射功能的时钟
gpio_pin_remap_config(GPIO_TIMER0_PARTIAL_REMAP, ENABLE);//设置为部分映射
rcu_periph_clock_enable(RCU_GPIOA);//使能TIMER0_CH0引脚的外设时钟
gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8);

TIMER0_REMAP[1:0]="11"(全映射):
TIMER0_CH0被映射到PE9引脚
TIMER0_CH1被映射到PE11引脚
TIMER0_CH2被映射到PE13引脚
TIMER0_CH3被映射到PE14引脚
rcu_periph_clock_enable(RCU_AF);		//使能映射功能的时钟
gpio_pin_remap_config(GPIO_TIMER0_FULL_REMAP, ENABLE);
rcu_periph_clock_enable(RCU_GPIOE);//使能GPIOE端口的外设时钟
gpio_init(GPIOE, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_14);
*/
void PWM0_Interrupt_Initializtion(uint16_t arr,uint16_t psc);

//函数功能:PWM0初始化,将PE14用作TIMER0_CH3引脚,输出PWM波形
//arr：自动重装值。
//psc：时钟预分频数
//PWM0_Interrupt_Initializtion(TIMER0,50000,1080);//当arr=50000,psc=1080时,则为500ms,误差为10us;
void PWM0_Interrupt_Initializtion(uint16_t arr,uint16_t psc)
{
	timer_parameter_struct TimerParameterStruct;
	timer_oc_parameter_struct Timer_OC_ParameterStruct;

/初始化TIMER0_CH3引脚开始
	rcu_periph_clock_enable(RCU_AF);		//使能映射功能的时钟
	gpio_pin_remap_config(GPIO_TIMER0_FULL_REMAP, ENABLE);
	//TIMER0_REMAP[1:0]="11"(全映射),将TIMER0_CH3映射到PE4引脚
	//TIMER0_REMAP[1:0]="01"(部分映射),将TIMER0_CH3映射到PA11引脚
	//TIMER0_REMAP[1:0]="00"(没有映射),默认将TIMER0_CH3映射到PA11引脚
	rcu_periph_clock_enable(RCU_GPIOE);//使能GPIOE端口的外设时钟
	gpio_init(GPIOE, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_14);
	//配置GPIOE14的工作模式为复用功能IO推挽输出和输出速度最大为50MHz
	//将PE14用作TIMER0_CH3引脚,输出PWM波形
/初始化TIMER0_CH3引脚结束

/初始化TIMER0计数器开始
	rcu_periph_clock_enable(RCU_TIMER0);      //使能TIMER0的APB2外设时钟
	//nvic_irq_enable(TIMER0_UP_IRQn, 2U, 0U);  //设置TIMER0_UP_IRQn的中断优先级,抢占优先级为2,子优先级为0

	timer_deinit(TIMER0);                 //复位TIMERx

	TimerParameterStruct.period            = arr-1; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
	TimerParameterStruct.prescaler         = psc-1; //设置用来作为TIMx时钟频率除数的预分频值(APB2时钟分频值)
	TimerParameterStruct.clockdivision     = TIMER_CKDIV_DIV1;   //设置时钟分母值为1
	//计算公式:arr*psc/108000000/1,当arr=250,psc=108时,则为0.25ms,误差为1us;
	TimerParameterStruct.counterdirection  = TIMER_COUNTER_UP;   //设置计数方向为"向上计数"
	TimerParameterStruct.alignedmode       = TIMER_COUNTER_EDGE; //设置为无中央对齐计数模式(边沿对齐模式)
	TimerParameterStruct.repetitioncounter = 0;                  //设置"重复计数次数"为0
	timer_init(TIMER0,&TimerParameterStruct);//根据TimerParameterStruct所指向的参数初始化TIMERx的时间基数单位

	timer_counter_value_config(TIMER0,0);//设置TIMERx的计数器初始值为0
	//timer_counter_read(TIMER0);//读取TIMERx的计数器值
/初始化TIMER0计数器结束

/初始化PWM0在TIMER0_CH3引脚输出电平的极性开始
  Timer_OC_ParameterStruct.outputstate  = TIMER_CCX_ENABLE;        //"通道引脚输出"使能
	Timer_OC_ParameterStruct.ocidlestate  = TIMER_OC_IDLE_STATE_LOW; //通道引脚空闲时输出为低电平
	Timer_OC_ParameterStruct.ocpolarity   = TIMER_OC_POLARITY_HIGH;  //通道引脚输出极性为高电平

	Timer_OC_ParameterStruct.outputnstate = TIMER_CCXN_DISABLE;      //"互补通道引脚输出"不使能
	Timer_OC_ParameterStruct.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;//互补通道引脚空闲时输出为高电平
	Timer_OC_ParameterStruct.ocnpolarity  = TIMER_OCN_POLARITY_HIGH; //互补通道引脚输出极性为高电平

	timer_channel_output_config(TIMER0,TIMER_CH_3,&Timer_OC_ParameterStruct);
	//根据Timer_OC_ParameterStruct所指定的参数初始化TIMER0通道0

	timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_3,250);
	//设置初始占空比为250/500

	timer_channel_output_mode_config(TIMER0,TIMER_CH_3,TIMER_OC_MODE_PWM0);
	//设置通道输出比较模式:PWM0模式
	//在向上计数时,一旦计数器值小于TIMERx_CH0CV时,O0CPRE为高电平,否则为低电平,这里是向上计数;
	//在向下计数时,一旦计数器的值大于TIMERx_CH0CV时,O0CPRE为低电平,否则为高电平;

	timer_channel_output_shadow_config(TIMER0,TIMER_CH_3,TIMER_OC_SHADOW_DISABLE);
	//禁止"通道0输出/比较影子寄存器"

	timer_primary_output_config(TIMER0,ENABLE);//使能TIMER0输出比较功能
/初始化PWM0在TIMER0_CH3引脚输出电平的极性结束

  timer_auto_reload_shadow_enable(TIMER0);//使能TIMERx自动重装载
/*
	timer_flag_clear(TIMER0,TIMER_FLAG_UP);               //清除"TIMERx更新标志位"
	timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_UP); //清除"TIMERx更新中断标志位"
	timer_interrupt_enable(TIMER0,TIMER_INT_UP);          //使能"TIMERx更新"产生中断

  timer_internal_clock_config(TIMER0);//设置"内部时钟"作为定时器时钟
	//timer_slave_mode_select(TIMER0,TIMER_SLAVE_MODE_DISABLE);
	//设置"关闭从模式",如果TIMER计数器使能,则预分频器直接由内部时钟驱动
*/
	timer_enable(TIMER0);//TIMERx计数器使能,开始工作
}

#include "LED.h"

void LED_Init(void);

//函数功能:初始化MCU_Led
void LED_Init(void)
{
	rcu_periph_clock_enable(RCU_GPIOD);//使能GPIOD时钟,enable GPIO clock

	gpio_init(GPIOD, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_15);
	//将GPIOD15设置为输出上拉

	MCU_Led_Off();
//	GPIO_BC(GPIOD) = GPIO_PIN_15;//清除GPIOD15输出,GPIO bit clear register
}

#ifndef __LED_H
#define __LED_H

#include "gd32f10x.h" //使能uint8_t,uint16_t,uint32_t,uint64_t,int8_t,int16_t,int32_t,int64_t

#define MCU_Led_Off()  GPIO_BOP(GPIOD)=GPIO_PIN_15  //GD15输出高电平
#define MCU_Led_On() GPIO_BC(GPIOD)=GPIO_PIN_15   //GD15输出低电平
#define MCU_Led_Toggle() gpio_bit_write( GPIOD,GPIO_PIN_15,(bit_status)((1-gpio_input_bit_get(GPIOD,GPIO_PIN_15))) )
//GD15取反输出电平

extern void LED_Init(void);

#endif

main.c程序如下：

#include "gd32f10x.h" //使能uint8_t,uint16_t,uint32_t,uint64_t,int8_t,int16_t,int32_t,int64_t
#include "delay.h"

#include "LED.h"
#include "PWM0.h"

int main(void)
{
	int16_t i = 0;
	FlagStatus breathe_flag = SET;

	//NVIC_PRIGROUP_PRE4_SUB0:抢占优先级为4bit(取值为0~15),子优先级为0bit(没有响应优先级)
	//NVIC_PRIGROUP_PRE3_SUB1:抢占优先级为3bit(取值为0~7),子优先级为1bit(取值为0~1)
	//NVIC_PRIGROUP_PRE2_SUB2:抢占优先级为2bit(取值为0~3),子优先级为2bit(取值为0~3)
	//NVIC_PRIGROUP_PRE1_SUB3:抢占优先级为1bit(取值为0~1),子优先级为3bit(取值为0~7)
	//NVIC_PRIGROUP_PRE0_SUB4:抢占优先级为0bit(没有抢占优先级),子优先级为3bit(取值为0~15)
	nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);//设置系统中断优先级"抢占优先级为4bit,子优先级为0bit"
  INTX_ENABLE();//开启所有中断

	LED_Init();//初始化MCU_Led
	delay_init();//系统时钟配置

	PWM0_Interrupt_Initializtion(50000,1080);
	//PWM0初始化,将PE14用作TIMER0_CH3引脚,输出PWM波形
	//设置PWM0周期为500ms,误差为10us;

	while(1)
	{
		delay_ms(40);
		if (SET == breathe_flag)
		{
			i = i + 10;
		}
		else
		{
			i = i - 10;
		}

		if(i>500)
		{
			breathe_flag = RESET;
	  }
		if(i<=0)
		{
			breathe_flag = SET;
		}
		timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_3,i);
		//每隔40ms,修改TIMER0_CH0引脚输出占空比为i/500
		MCU_Led_Toggle();
	}
}