关于原子哥捕获实验的问题

zz825 · 发表于 2015-8-7 17:24:02

[mw_shl_code=c,true] 求教：根据溢出时间的公式 [mw_shl_code=c,true]TIM5_Cap_Init(0XFFFF,72-1); 0xffff 是否应该设置为0xfffe?[/mw_shl_code] [/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true]#include "led.h" #include "delay.h" #include "key.h" #include "sys.h" #include "usart.h" #include "timer.h" extern u8 TIM5CH1_CAPTURE_STA; //????????×??? extern u16 TIM5CH1_CAPTURE_VAL; //?????????? int main(void) { u32 temp=0; delay_init(); //???±?????????? NVIC_Configuration(); //?è??NVIC????·?×é2:2??????????????2???ì???????? uart_init(9600); //?®??????????9600 LED_Init(); //LED?????????? TIM3_PWM_Init(899,0); //??·?????PWM????=72000/(899+1)=80Khz TIM5_Cap_Init(0XFFFF,72-1); //??1Mhz?????????? while(1) { delay_ms(10); TIM_SetCompare2(TIM3,TIM_GetCapture2(TIM3)+1); if(TIM_GetCapture2(TIM3)==300)TIM_SetCompare2(TIM3,0); if(TIM5CH1_CAPTURE_STA&0X80)//?????????????????????? { temp=TIM5CH1_CAPTURE_STA&0X3F; temp*=65536;//?????±??×??? temp+=TIM5CH1_CAPTURE_VAL;//????×??????????±?? printf("HIGH:%d us\r\n",temp);//?ò??×??????????±?? TIM5CH1_CAPTURE_STA=0;//?????????????? } } } [/mw_shl_code]