Hey folks 
,
first I am sorry I just attached the code, but did not use code tags.
I have changed and updated the code now.
I am working on a project, controlling a heliostat via a DiSEqC motor (Moteck Sg-2100A) and Arduino UNO.
Curcuitry is working fine, but the thing is my code.
I have to modulate a 22kHz carrier signal to:
- logical 0: on 1ms, off 0.5ms
- logical 1: on 0.5ms, off 1ms
The 22kHz carrier signal is generated fine, but my problems start with the bit modulation.
For generating the carrier signal, I am using timer2. For bit modulation now I am trying to change the compare register OCR2A after 22 cycles have passed. For this I increment the cnt variable.
My problem now is, that I don't know how to manage the calls of ISR() and f_on(). After the first ISR() call, I want f_on() to continue with the steps after the ISR() has been called 21 more times (overall 22 times). Then f_on() calls f_off(). f_off() then changes OCR2A to the corresponding value for 1ms or 0.5ms signal off so it interrupts only once.
After that bitCheck() is called and the whole thing starts again.
But my motor does not react to any command. The LED just blinks orange (from green before) for about 200ms (it's hard to recognize).
//#defineĀ TIMER2STARTĀ OCR2A |= B00101100Ā //B01111111
//#defineĀ TIMER2STOPĀ OCR2A = 0
#define TIMER2START TCCR2A |= (1 << COM2A0)
#define TIMER2STOP TCCR2A &= (0 << COM2A0)
#define TIMER2PRESC_8 TCCR2B = B00001010; mode = 0;
#define TIMER2PRESC_32 TCCR2B = B00001011; mode = 1;
#define MODULATION_HI mode = 1
#define MODULATION_LO mode = 0
#define MODULATION_ISHI mode == 1
#define MODULATION_ISLO mode == 0
#define TIMER2OUTPUTsetĀ DDRB |= (1 << DDB3)// | TIMSK2 |= (1 << OCIE2A)Ā // set PB3 as OUTPUT (Ard: PIN11)
#define TIMER2OUTPUTresetĀ DDRB &= (0 << DDB3) | TIMSK2 &= (0 << OCIE2A)
#define TIMER2OUTPUTtoggleĀ DDRB ^= (1 << DDB3)Ā // toggle PB3
#define TIMER2OUTPUTpinsetĀ PINB |= (1 << PINB3)
#define TIMER2OUTPUTpinresetĀ PINB &= (0 << PINB3)
byte mode = 0;
byte bitValue = 0;
boolean ACK1 = false;
boolean ACK2 = false;
byte j = 0;
unsigned int test = 0;
volatile unsigned int cnt = 0;
volatile int compare = 0;
String goWest = "101000011001100010011010011010000000";
//String goWest = "000000000000000001111111111111111111";
void timer2Init()
{
TCCR2A = _BV(WGM21) | _BV(WGM20);
//TIMER2PRESC_8;
TCCR2B = _BV(WGM22) | _BV(CS21); //prescaler = 8
// OCR2A = B00101100;Ā //44 : 22.22kHzĀ //B11000111; // 199, so timer2 counts from 0 to 199 (200 cycles at 16 MHz)
TIMSK2 |= (1 << OCIE2A);
}
ISR(TIMER2_COMPA_vect){
// cli();
if (MODULATION_ISHI){
cnt++;
if (cnt == 21){
TIMER2STOP;
fOff(bitValue);
}
else
Serial.println("while1");
}
else if (MODULATION_ISLO){
txACK = true;
}
// sei();
}
void fOn(byte bitValue){
switch (bitValue){
case 0:
{
OCR2A = B00101100; //22kHz
TIMER2PRESC_8;
MODULATION_HI;
TIMER2START;
/*while (cnt < 21)
while (1);*/
/*do{
if (cnt == 21){
TIMER2STOP;
fOff(bitValue);
}
else
Serial.println("while1");
}
while (cnt < 21);*/
cnt = 0;
}
break;
case 1:
{
OCR2A = B00101100;
TIMER2PRESC_8;
MODULATION_HI;
TIMER2START;
/*do{
if (cnt == 11){
TIMER2STOP;
fOff(bitValue);
}
else
Serial.println("while2");
}
while (cnt < 12);*/
cnt = 0;
}
break;
}
}
boolean fOff(int bitValue){
switch (bitValue){
case 0:
{
OCR2A = B01111100; //124: 2kHz: ISR() after 0.5ms
TIMER2PRESC_32;
MODULATION_LO;
TIMER2START;
if (txACK == true){
TIMER2STOP;
}
txACK = false;
bitCheck();
}
break;
case 1:
{
OCR2A = B11111001; //249: 1kHz: ISR() after 1ms
TIMER2PRESC_32;
MODULATION_LO;
TIMER2START;
if (txACK == true){
TIMER2STOP;
}
txACK = false;
bitCheck();
}
break;
}
return(txACK);
}
byte bitCheck(){
for (j = 0; j < 36; j++){
if (goWest[j] == '1'){
bitValue = 1;
fOn(bitValue);
}
else if (goWest[j] == '0'){
bitValue = 0;
fOn(bitValue);
}
else
Serial.println("Error in command string!");
}
return(bitValue);
}
void setup()
{
TIMER2OUTPUTset;
Serial.begin(57600);
timer2Init();
Serial.println(goWest);
bitCheck();
// TIMER2START;
}
void loop()
{
test++;
}
It would be awesome if somebody could help with that! 
Thanks in advance
cyrusxx
