Input Capture
According to the chip manual, timer 2 can be used as input capture. The setup is very simple. The official also provides macros for us to use.
void Time2_cap_init(void)
{
/******* Input capture CF settings *********/
Set_All_GPIO_Quasi_Mode;
P04_Input_Mode;
//P04 = 1;
TIMER2_CAP0_Capture_Mode; //Timer 2 enables input capture function
IC3_P04_CAP0_RisingEdge_Capture; //P04 pin, capture mode: rising edge capture
set_ECAP; // Enable input capture interrupt
set_TR2;
set_EA;
}
Processing Function
My processing function is very simple. After capturing a rising edge, it changes to a falling edge trigger, that is, it captures a pulse.
1 void Capture_ISR (void) interrupt 12
2 {
3 static char state;
4
5 if(state == 1)
6 {
7 IC3_P04_CAP0_RisingEdge_Capture; //Start rising edge capture
8 pulse_cnt++; //Capture times plus 1
9
10 state = 0;
11 }
12 else //First capture rising edge
13 {
14 IC3_P04_CAP0_FallingEdge_Capture; //Start falling edge capture
15 state = 1;
16
17 }
18 clr_CAPF0;
19
20
twenty one }
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