tinyClicker/main.c at master · hingev/tinyClicker · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
#include <avr/io.h>
#include <util/delay.h>
#include <stdint.h>

#define NEXT 			PB2
#define PREV 			PB0

typedef enum {NONE, RIGHT, LEFT} STATUS;

void enable_pwm () {
	TCCR0B |= (1 << CS01);												/* prescaler 1:1 */
	DDRB |= (1 << PB1);
}

void disable_pwm () {
	TCCR0B = 0;
	DDRB &= ~(1 << PB1);
}

void send_bit (uint8_t v) {
	enable_pwm ();
	_delay_ms (0.56);
	disable_pwm ();
	if (v)
		_delay_ms (1.69);
	else
		_delay_ms (0.56);
}

void send_byte (uint8_t b) {
	register uint8_t i = 0 ;
	for (i =0 ; i < 8; ++i) {
		send_bit (b & (1 << i));
	}
}

void send_code (uint8_t code) {

	uint8_t addr = 0xaa;

	enable_pwm ();
	_delay_ms (9);
	disable_pwm ();
	_delay_ms (4.5);

	send_byte (addr);
	send_byte (0xff ^ addr);
	send_byte (code);
	send_byte (code ^ 0xff);
	//send_byte (0xaa);
	send_bit (1);

}

int main (void) {

	PRR = 0;

	/* init Timer0 for PWM on OC0A */
	/* of the 38khz carrier for IR NEC */
	TCCR0A |= (1 << COM0B0) | (1 << WGM01); 			/* CTC, toggle on match */
	OCR0A = 12; // (1 MHZ / 26 ) = 38.4 Khz ~ 38 khz carrier
	DDRB |= (1 << PB1);

#if 0
	while (1) {

		enable_pwm ();
		_delay_ms (1);
		disable_pwm ();
		_delay_ms (1);

	}
#endif

#if 0

	uint8_t i = 0;
	while (1) {
		send_code ((i++)%2 ? 0x08 : 0x5a);

		_delay_ms (400);
	}


#endif

	/* set up pullups for next/prev buttons  */
	PORTB |= (1 << NEXT) | (1 << PREV);


	STATUS doing = NONE;
	while (1) {
		uint8_t code = 0;

		if (doing == NONE) {
			if ( (PINB & (1 << NEXT)) == 0) {
				doing = RIGHT;
				code = 0x08;
			}
			else if ( (PINB & (1 << PREV)) == 0) {
				doing = LEFT;
				code = 0x5a;
			}

			if (doing != NONE) {
				enable_pwm ();
				send_code ( code );
				disable_pwm ();
			}
		}
		else {
			_delay_ms (40);

			if ( (PINB & (1 << PREV)) &&
				 (PINB & (1 << NEXT)) )
				doing = NONE;
		}

	}


	return 0;
}