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For input capture, the settings that are initialized include (for channel 1):
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IC1CONbits.ICM = 0b00; // Disable Input Capture 1 module IC1CONbits.ICTMR = 1; // Select Timer2 as the IC1 Time base IC1CONbits.ICI = 0b11; // Interrupt on every capture event IC1CONbits.ICM = 0b001; // Generate capture event on every Rising and Falling edge // Enable Capture Interrupt And Timer2 IPC0bits.IC1IP = 7; // Setup IC1 interrupt priority level - Highest IFS0bits.IC1IF = 0; // Clear IC1 Interrupt Status Flag IEC0bits.IC1IE = 1; // Enable IC1 interrupt |
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For output capture, the settings that are initialized include (for channel 1):
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// Initialize Output Compare Module OC1CONbits.OCM = 0b000; // Disable Output Compare Module OC1R = MIDDLE\_PWM; // Write the duty cycle for the first PWM pulse = 1.5ms/4688 OC1RS = MIDDLE\_PWM; // Write the duty cycle for the second PWM pulse] = 1.5ms/4688 OC1CONbits.OCTSEL = 0; // Select Timer 2 as output compare time base OC1CONbits.OCM = 0b110; // Select the Output Compare mode (without fault protection) |
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Likewise, since both IC and OC use timer2. An initialization of this component is also required:
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T2CONbits.TON = 0; // Disable Timer T2CONbits.TCS = 0; // Select internal instruction cycle clock T2CONbits.TGATE = 0; // Disable Gated Timer mode T2CONbits.TCKPS = 0b01; // Select 1:8 Prescaler TMR2 = 0x00; // Clear timer register setPeriod(20); IPC1bits.T2IP = 0x01; // Set Timer 2 Interrupt Priority Level - Lowest IFS0bits.T2IF = 0; // Clear Timer 2 Interrupt Flag IEC0bits.T2IE = 1; // Enable Timer 2 interrupt T2CONbits.TON = 1; // Start Timer |
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