uint16_t get_period(void)
{
    uint8_t go;
    uint8_t timeout;
    uint16_t 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

    timer1_stop();
    timer1_clear();
    timer1_start();

    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
        }
    }

    timer1_stop();
    timer1_clear();
    go = 1;
    timer1_start();

    while (go != 0)
    {
        if (FREQ_PIN == 0)
        {           // Wait for low on freq pin
            go = 0;
        }
        if (PIR1bits.TMR1IF != 0)
        {
            return (0xffff);            // Return FAIL
        }
    }

    timer1_stop();
    timer1_clear();
    go = 1;
    timer1_start();

    while (go != 0)
    {
        if (FREQ_PIN != 0)
        {   // Wait for high on freq pin
            timer1_stop();
            go = 0;
        }
        if (PIR1bits.TMR1IF != 0)
        {
            return (0xffff);            // Return FAIL
        }
    }

    timer1_stop();
    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);
}