void IRsend_mark(u16 time)
{
u16 i;
// Sends an IR mark for the specified number of microseconds.
// The mark output is modulated at the PWM frequency.
// duty cycle = 50% = Enable PWM output
PWM_setPercentDutyCycle(irparams.outpin, 50);
// loopcounter i = time - correction factor
// Without the NOPs the loop has an execution time of ~13 microseconds
i = time-13;
// while () {} needs much less time than for (;;) {}
// for loop without NOPs : ~ 1,3 ms (889 iterations on 18f26j50)
// while loop without NOPs: ~ 712 µs (889 Iterations on 18f26j50)
while (i) {
_1us_
i--;
}
/*
for (i=0; i<time; i++)
{
; _1us_
}
*/
}
void Tone(u8 pin, u16 freq, u16 duration)
{
PWM_setFrequency(freq);
PWM_setPercentDutyCycle(pin, 50);
Delayms(duration); // length of sound in ms
noTone(pin);
}
// Note: first bit must be a one (start bit)
void IRsend_sendRC5(u32 data, u16 nbits)
{
u16 i;
PWM_setFrequency(36000);
PWM_setPercentDutyCycle(irparams.outpin, 50);
data = data << (32 - nbits);
IRsend_mark(RC5_T1); // First start bit
IRsend_space(RC5_T1); // Second start bit
IRsend_mark(RC5_T1); // Second start bit
for (i = 0; i < nbits; i++)
{
if (data & TOPBIT)
{
IRsend_space(RC5_T1); // 1 is space, then mark
IRsend_mark(RC5_T1);
}
else
{
IRsend_mark(RC5_T1);
IRsend_space(RC5_T1);
}
data <<= 1;
}
IRsend_space(0); // Turn off at end
}
void noTone(u8 pin)
{
PWM_setFrequency(0); // note (range 1..14)
PWM_setPercentDutyCycle(pin, 0); // silence
//pinmode(pin, INPUT);
//CCP1CON = 0; // stop sound = stop pwm
//T2CONbits.TMR2ON = OFF; // disable Timer2 = stop pwm = stop sound
}
/* Leave pin off for time (given in microseconds) */
void IRsend_space(u16 time)
{
u16 i;
// Sends an IR space for the specified number of microseconds.
// A space is no output, so the PWM output is disabled.
// duty cycle = 0% = Disable PWM output
PWM_setPercentDutyCycle(irparams.outpin, 0);
// loopcounter i = time - correction factor
// without the NOPs the loop has an execution time of ~70 microseconds
i = time - 70; // correction factor: 13 microseconds
while (i) {
_1us_
i--;
}
/*
for (i=0; i<time; i++)
{
_1us_
}
*/
}
