stm32单片机测占空比源代码 -

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "timer.h"
#include "usart.h"
#include "time1.h"
#include "lcd.h"
//ALIENTEK Mini STM32开发板范例代码9
//输入捕获实验
//技术支持：www.openedv.com
//广州市星翼电子科技有限公司
extern u8 TIM2CH1_CAPTURE_STA; //输入捕获状态
extern u16 TIM2CH1_CAPTURE_VAL; //输入捕获值
extern u16 TIM2CH1_CAPTURE_SUM;
extern u8 TIM4CH1_CAPTURE_STA; //输入捕获状态
extern u16 TIM4CH1_CAPTURE_VAL;
int main(void)
{
u8 *str;
u8 cha[100];
u32 temp=0;
u32 temp1=0;
u32 temp2=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2
delay_init(); //延时函数初始化
uart_init(9600); //9600
LED_Init(); //初始化与LED连接的硬件接口
LCD_Init();
POINT_COLOR=RED;//设置字体为红色
LCD_ShowString(60,50,200,16,16,"Mini STM32");
LCD_ShowString(60,70,200,16,16,"ADC TEST");
LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(60,110,200,16,16,"2014/3/9");
LCD_ShowString(60,130,200,16,16,"ADC_CH1_VAL:");
TIM1_PWM_Init(899,0); //不分频。PWM频率=72000/(899+1)=80Khz
// TIM1_PWM_Init(7199,999);
//TIM_GetITStatus(TIM1,3600);
// TIM_SetCompare1(TIM1,3600);
TIM2_Cap_Init(0xffff,72-1); //以1Mhz的频率计数
TIM4_Cap_Init(0xffff,72-1);
while(1)
{
delay_ms(10);
TIM_SetCompare1(TIM1,TIM_GetCapture1(TIM1)+1);
if(TIM_GetCapture1(TIM1)==300)TIM_SetCompare1(TIM1,0);
if(TIM2CH1_CAPTURE_STA&0X80)//成功捕获到了一次高电平
{
temp=TIM2CH1_CAPTURE_STA&0X3F;
temp*=65536; //溢出时间总和
temp1=temp+TIM2CH1_CAPTURE_VAL; //得到总的高电平时间
printf("HIGH:%d us\r\n",temp1); //打印总的高点平时间
LCD_ShowxNum(60,130,temp1,16,16,0);
// for(int i=0;i<10;i++)
// {
// cha[i]=
// }
// str=&cha;
// LCD_ShowString(60,130,200,16,16,str);
TIM2CH1_CAPTURE_STA=0; //开启下一次捕获
}
if(TIM4CH1_CAPTURE_STA&0X40)//成功捕获到了一次高电平
{
temp2=TIM4CH1_CAPTURE_STA&0X3F;
temp2*=65536; //溢出时间总和
temp2+=TIM4CH1_CAPTURE_VAL; //得到总的高电平时间
printf("LOW:%d us\r\n",temp2); //打印总的高点平时间
TIM4CH1_CAPTURE_STA=0; //开启下一次捕获
}
printf("SUM:%d us\r\n",temp1+temp2);
printf("DUTY:%0.2lf\r\n ",temp1*1.0/(temp1+temp2));
}
}

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