unsigned int get_period(void)
{
    unsigned char go,timeout;
    unsigned int retval;

    // Note: with 32 Mhz clock and /8 prescaler, the frequency
    // of the measured signal can be computed as such:
    // Freq (in MHz) = 16384 / value returned by get_period.
    //

    // For other clock freqs, add proper setup code

#ifdef CLOCK_32_MHZ
    T1CON = 0x30;       // OSC/8 prescaler, turn timer off
    TMR1H = 0x00;       // Zero the timer.
    TMR1L = 0x00;
    T1CON = 0x31;       // start the timer (for detecting timeout)
#endif

    PIR1bits.TMR1IF =0;
    PIE1 = 0x00;
    PIE2 = 0x00;

    // Fix: DON'T just set INTCON=0; this prematurely clears TMR0IF, which is needed
    // for correct blinkage timing. n3wdz 11-17-09
    INTCONbits.PEIE=0;
    INTCONbits.GIE=0; // No ints required!

    go=1;
    timeout=0;


    // Re-wrote all comparisons to be == or != 0, to generate faster code
    // Resulted in accuracy now of +/- 1 clock tick.

    while (go!=0) {
        if (FREQ_PIN != 0)  {           // Wait for high on freq pin
            go = 0;
        }
        if (PIR1bits.TMR1IF != 0) {     // Check for timer OVFL
            return (0xffff);            // Return FAIL
        }
    }
    T1CONbits.TMR1ON = 0;               // Turn off timer
    TMR1H=0x00;
    TMR1L=0x00;                         // Clear timer
    go=1;
    T1CONbits.TMR1ON = 1;               // Turn on timer
    while (go!=0) {
        if (FREQ_PIN == 0) {            // Wait for low on freq pin
            go = 0;
        }
        if (PIR1bits.TMR1IF != 0) {
            return (0xffff);            // Return FAIL
        }
    }
    T1CONbits.TMR1ON = 0;               // Turn off timer
    TMR1H=0x00;
    TMR1L=0x00;                         // Clear timer
    go=1;
    T1CONbits.TMR1ON = 1;               // Turn on timer
    while (go!=0) {
        if (FREQ_PIN != 0) {            // Wait for high on freq pin
            T1CONbits.TMR1ON = 0;       // Timer1 off
            go = 0;
        }
        if (PIR1bits.TMR1IF != 0) {
            return (0xffff);            // Return FAIL
        }
    }
    T1CONbits.TMR1ON = 0;               // Timer1 off
    retval=(TMR1H<<8) | TMR1L;          // Get final timer val
    RFPeriod = retval;                  // NOTE: If you call get_stable_period, set RFPeriod equal to its result when done
    return (retval);
}