GD32F103输入捕获

GD32F103输入捕获程序，经过多次测试，终于完成了。本程序将TIMER2_CH2通道映射到PB0引脚，捕获PB0引脚低电平脉冲时间宽度。PB0是一个按钮，第1次按下采集一个值保存到TIMER2_CountValue1中，第2次按下采集一个值保存到TIMER2_CountValue2中，然后计算其低电平时间宽度。

网上也有人写了测试案例，但好像能用，但不是很完善。

我喜欢直奔主题，程序如下：

#include "Timer2_InputCapture.h"
#include "stdio.h"  //使能printf(),sprintf()

uint16_t TIMER2_CountValueMAX = 65535;//设定最大捕获计数器值为65535
uint32_t TIMER2_CLKFrequence;
uint16_t TIMER2_OverValue = 0;//溢出次数
uint32_t TIMER2_CountValue1=0;
uint32_t TIMER2_CountValue2=0;
uint32_t TIMER2_CountResult=0;
uint8_t TIMER2_CaptchStatus=0;
float MyPeriod=0;
float MyFrequence=0;

void TIMER2_Input_Init(void);

//函数功能:将TIMER2_CH2通道映射到PB0引脚,捕获PB0引脚低电平脉冲时间宽度
//Tout=(65535+1)*(107+1)/108000000=0.065536秒
//TIMER2输入时钟频率:108000000/(107+1)=1000000Hz
void TIMER2_Input_Init(void)
{
	timer_parameter_struct      TimerParameterStruct;   //TIMER0初始化结构体
	timer_ic_parameter_struct   timer_icinitpara; //TIMER0输入捕获结构体
  rcu_periph_clock_enable(RCU_TIMER2);     //使能TIMER0时钟
  rcu_periph_clock_enable(RCU_GPIOB);      //使能GPIOB时钟
	rcu_periph_clock_enable(RCU_AF);         //使能复用时钟
	gpio_init(GPIOB, GPIO_MODE_IPU, GPIO_OSPEED_50MHZ, GPIO_PIN_0);
	//将TIMER2_CH2通道映射到PB0引脚

	timer_deinit(TIMER2);
  timer_struct_para_init(&TimerParameterStruct);  //将初始化结构体参数变为初始值
	TimerParameterStruct.period            = TIMER2_CountValueMAX;   //定时器装载值,计数值超出后会产生溢出中断
  TimerParameterStruct.prescaler         = 107; //设置用来作为TIMx时钟频率除数的预分频值(APB2时钟分频值)
//Tout= ((arr+1)(psc+1))/Tclk；
//Tclk：TIM的输入时钟频率(单位为Hz),在这里是108000000Hz
//psc为定时器预分频值,在这里是107
//arr为重装载值,在程序中为65535
//Tout：TIM溢出时间(单位为s),Tout=(65535+1)*(107+1)/108000000=0.065536秒
	TimerParameterStruct.clockdivision     = TIMER_CKDIV_DIV1;   //设置时钟分母值为1

	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;                  //重复计数,重复溢出多少次才会溢出中断,此处配置为0,不重复
	timer_init(TIMER2,&TimerParameterStruct);//根据TimerParameterStruct所指向的参数初始化TIMERx的时间基数单位
 
	timer_channel_input_struct_para_init(&timer_icinitpara);    //将输入捕获结构体参数变为初始值
	timer_icinitpara.icpolarity  = TIMER_IC_POLARITY_FALLING;    //通道输入极性
	timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI; //通道输入模式选择"通道直连"
	timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;           //通道输入预分频器
	timer_icinitpara.icfilter    = 0;                         //通道输入捕获滤波
	timer_input_capture_config(TIMER2,TIMER_CH_2,&timer_icinitpara);

  timer_counter_value_config(TIMER2,0);//设置TIMER2的计数器初始值为0
	timer_auto_reload_shadow_enable(TIMER2); //自动重装载使能
/
  timer_flag_clear(TIMER2,TIMER_FLAG_UP);               //清除"TIMERx更新标志位"
  timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_UP); //清除"TIMERx更新中断标志位"
	timer_interrupt_enable(TIMER2,TIMER_INT_UP);          //使能"TIMERx更新"产生中断
	timer_internal_clock_config(TIMER2);//设置"内部时钟"作为定时器时钟
	TIMER2_CLKFrequence=SystemCoreClock/(TimerParameterStruct.prescaler+1);
	//SystemCoreClock=108000000MHz
/
	timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_CH2); //清除CH2的中断标志位
	timer_interrupt_enable(TIMER2,TIMER_INT_FLAG_CH2); //CH2通道中断使能
  nvic_irq_enable(TIMER2_IRQn,1,0); //使能中断线
	timer_enable(TIMER2);
}

/*
KEY==0
TIMER2_OverValue=11,  TIMER2_CountValue1=19395,  TIMER2_CountValue2=30890,  TIMER2_CountResult=732380
MyPeriod=0.732380s
MyFrequence=1.365411Hz
KEY==0
*/
//TIMER2中断服务函数
void TIMER2_IRQHandler(void)
{
	if( SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_FLAG_UP) )// 读取更新中断标志位
	{
		if(1 == TIMER2_CaptchStatus) TIMER2_OverValue++;
		timer_flag_clear(TIMER2,TIMER_FLAG_UP);               //清除"TIMER0更新标志位"
		timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_UP); //清除"更新中断标志位"
//		printf("\r\nTIMER2 Interrupt");
	}
	if(timer_interrupt_flag_get(TIMER2,TIMER_INT_FLAG_CH2) != RESET)
	{
		timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_CH2);
    if(0 == TIMER2_CaptchStatus)
		{
			TIMER2_OverValue=0;//清除溢出计数器
			TIMER2_CountValue1 = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_2);
			TIMER2_CaptchStatus = 1;
		}
		else if(1 == TIMER2_CaptchStatus)
		{
			TIMER2_CountValue2 = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_2);
			TIMER2_CountResult	=	(TIMER2_OverValue*TIMER2_CountValueMAX-TIMER2_CountValue1)+TIMER2_CountValue2;

			MyPeriod=(float)TIMER2_CountResult/TIMER2_CLKFrequence;
			MyFrequence = (float)TIMER2_CLKFrequence/ TIMER2_CountResult;
			
			printf("\r\nTIMER2_OverValue=%u,  TIMER2_CountValue1=%u,  TIMER2_CountValue2=%u",TIMER2_OverValue,TIMER2_CountValue1,TIMER2_CountValue2);
			printf(",  TIMER2_CountResult=%u",TIMER2_CountResult);
			printf("\r\nMyPeriod=%fs",MyPeriod);
			printf("\r\nMyFrequence=%fHz",MyFrequence);
      TIMER2_OverValue = 0;//溢出次数
      TIMER2_CountValue1=0;
      TIMER2_CountValue2=0;
      TIMER2_CountResult=0;
			TIMER2_CaptchStatus = 0;
		}
	}
}

#include "KEY.h"

void KEY_Init(void);

//函数功能:初始化KEY
void KEY_Init(void)
{
	rcu_periph_clock_enable(RCU_GPIOB);//使能GPIOB时钟,enable GPIO clock
	gpio_init(GPIOB, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_0);//将GPIOB0设置为浮空输入
}

#ifndef __KEY_H
#define __KEY_H

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

#define KEY  PBin(0)   		//读取PB0的输入状态值
#define Read_KEY_Value()  gpio_input_bit_get(GPIOB, GPIO_PIN_0) //读取PB0的输入状态值

extern void KEY_Init(void);

#endif

#include "gd32f10x.h" //使能uint8_t,uint16_t,uint32_t,uint64_t,int8_t,int16_t,int32_t,int64_t
#include "UART3.h"
#include "stdio.h"  //使能printf(),sprintf()
#include "KEY.h"
#include "Timer2_InputCapture.h"

const char CPU_Reset_REG[]="\r\nCPU reset!\r\n";
int main(void)
{
	//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"
	UART3_Init(115200);//初始化UART3
	printf("%s",CPU_Reset_REG);//调试串口输出"\r\nCPU reset!\r\n"

  INTX_ENABLE();//开启所有中断

	KEY_Init();//初始化KEY
	TIMER2_Input_Init();//将TIMER2_CH2通道映射到PB0引脚,捕获PB0引脚低电平脉冲时间宽度

	while(1)
	{
		if(KEY==0)
    {
		  printf("\n\rKEY==0");
			while(KEY==0);//等待按键释放
		}
	}
}

#include "UART3.h"
#include "stdio.h"  //使能printf(),sprintf()

void UART3_Init(unsigned int bound);

//函数功能：初始化串口3,这个和STM32F103VET6的UART4兼容
void UART3_Init(unsigned int bound)
{
	rcu_periph_clock_enable(RCU_GPIOC); //使能GPIOC时钟,enable GPIO clock 
	rcu_periph_clock_enable(RCU_UART3); //使能UART3时钟,enable USART clock

	gpio_init(GPIOC, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_10);
	//将GPIOC10设置为AFIO口(复用IO口),输出上拉

	gpio_init(GPIOC, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_11);
	//将GPIOC11设置为浮空输入口

	usart_deinit(UART3);                         //复位UART3,USART configure
	usart_baudrate_set(UART3, bound);          //设置UART3的波特率
	usart_word_length_set(UART3, USART_WL_8BIT); //设置UART3数据传输格式为8位
	usart_stop_bit_set(UART3, USART_STB_1BIT);   //设置UART3停止位为1位
	usart_parity_config(UART3, USART_PM_NONE);   //设置UART3无需奇偶校验
	usart_hardware_flow_rts_config(UART3, USART_RTS_DISABLE); //设置不使能UART3的RTS引脚功能
	usart_hardware_flow_cts_config(UART3, USART_CTS_DISABLE); //设置不使能UART3的CTS引脚功能
	usart_receive_config(UART3, USART_RECEIVE_ENABLE);   //使能UART3接收
	usart_transmit_config(UART3, USART_TRANSMIT_ENABLE); //使能UART3发送
	usart_enable(UART3); //使能UART3
}

/* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f)
{
	usart_data_transmit(UART3, (uint8_t) ch);
	while( RESET == usart_flag_get(UART3, USART_FLAG_TBE) )
	{//等待串口0发送结束
	}

	return ch;
}