#define bit_set(p,m) ((p) |= (1<<m))
#define bit_clear(p,m) ((p) &= ~(1<<m))
volatile byte ramka[21];
void zrob_ramke () {
ramka[1] = 0x7E; // początek pakietu
ramka[2] = 0; // RX nr
ramka[3] = 0; // FLAG1
ramka[4] = 0; // FLAG2
// 5-16 - kanały 1-8
ramka[17] = 0; // stała
// 18,19 CRC16 lowByte(x); highByte(x);
ramka[20] = 0x7E; // koniec pakietu
}
void setup() {
zrob_ramke();
init_timer1();
}
void loop() {}
void init_timer1() {
cli();
TCCR1A = 0; // set entire TCCR1 register to 0
TCCR1B = 0;
OCR1A = 100; // compare match register, change this
TCCR1B |= (1 << WGM12); // turn on CTC mode
TCCR1B |= (1 << CS11); // 8 prescaler: 0,5 microseconds at 16mhz
TIMSK1 |= (1 << OCIE1A); // enable timer compare interrupt
sei();
}
ISR(TIMER1_COMPA_vect) { // ---------------------------------------- nadawanie PXX - pin 13 (PB5) --------------------------------------------
static byte cykl = 0;
static byte ile_1 = 0;
static byte _bit=0, nr_bit=7, nr_byte=1;
TCNT1 = 0; OCR1A = 8 * 2;
if ( ramka[ nr_byte ] & 1 << nr_bit ) { _bit=1; } else { _bit=0; ile_1=0; } // jaki bit teraz wysyłany
if ( ( ile_1 == 5 ) && ( cykl == 0 ) ) { cykl = 10; ile_1=0; } // jeżeli jest pięć jedynek wyślij 0
switch (cykl++) {
case 0:
if ( nr_bit == 0 ) { nr_bit=8; nr_byte++; if ( nr_byte == 21 ) { nr_byte=1; } }
nr_bit--; // kolejny bit do obróbki
if ( _bit) { cykl=5; } else { cykl=6; }
case 5: bit_clear(PORTB,PB5);
if ( ( nr_byte > 1 ) && ( nr_byte < 20 ) ) { ile_1++; } // licz ile bitów 1 z rzędu
break;
case 6: bit_clear(PORTB,PB5); break;
case 7: bit_set(PORTB,PB5); cykl=0; break;
case 10: bit_clear(PORTB,PB5); break; //10,11 - dodatkowy bit 0 po pięciu 1
case 11: bit_set(PORTB,PB5); cykl=0; break;
}
}
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