1 | /*
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2 | Button codes Olympus:
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3 |
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4 | Fire 0110 0001 1101 1100 1000 0000 0111 1111
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5 | W 0110 0001 1101 1100 0100 0000 1011 1111
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6 | T 0110 0001 1101 1100 1100 0000 0011 1111
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7 | - 0110 0001 1101 1100 0010 0000 1101 1111
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8 | + 0110 0001 1101 1100 1010 0000 0101 1111
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9 |
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10 | Each command starts with 8ms pulsed with 40khz followed by
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11 | 4ms of low level followed by 550us pulsed with 40khz.
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12 | After that header sequence the bits above are sent:
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13 | "Zero" is represented by 559us of low level followed by 559us pulsed.
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14 | "One" is represented by 1677us of low level followed by 559us pulsed.
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15 | */
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16 |
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17 |
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18 | #include <avr/io.h>
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19 | #include <avr/interrupt.h>
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20 | #include <util/delay.h>
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21 |
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22 |
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23 | volatile unsigned int cnt = 0;
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24 |
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25 | // prototypes:
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26 | void send_0(void);
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27 | void send_1(void);
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28 | void send_header(void);
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29 | void send_cmd(unsigned char cmd);
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30 |
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31 |
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32 | int main(void)
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33 | {
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34 | DDRC = 0x00; // Buttons at PC5 - PC1
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35 | PORTC = 0xFF;
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36 | DDRB |= (1<<PB0); // IR-LED at PB0
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37 | PORTB |= (1<<PB0);
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38 |
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39 | TIMSK |= (1<<OCIE2); // TIMER2 compare match interrupt
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40 | TCCR2 |= ((1<<WGM21) | (1<<CS20)); // TIMER2 CTC; presc = 1
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41 | OCR2 = 99;
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42 |
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43 | sei();
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44 |
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45 |
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46 | while(1)
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47 | {
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48 | if(!(PINC & (1<<PC5))) send_cmd(0);
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49 | if(!(PINC & (1<<PC4))) send_cmd(1);
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50 | if(!(PINC & (1<<PC3))) send_cmd(2);
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51 | if(!(PINC & (1<<PC2))) send_cmd(3);
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52 | if(!(PINC & (1<<PC1))) send_cmd(4);
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53 | }
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54 | }
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55 |
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56 |
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57 |
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58 | void send_cmd(unsigned char cmd)
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59 | {
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60 | unsigned char i = 0;
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61 | // Bytes for Fire, W, T, +, -; bits in reverse order!
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62 | const unsigned char byte[5] = {0xE1, 0xD2, 0xC3, 0xB4, 0xA5};
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63 |
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64 | send_header();
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65 |
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66 | for(i=0; i<4; i++) // first 4 bits
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67 | {
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68 | if((byte[cmd] >> i) & 0x01) send_1();
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69 | else send_0();
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70 | }
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71 |
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72 | for(i=0; i<4; i++) send_0();
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73 |
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74 | for(i=4; i<8; i++) // last 4 bits
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75 | {
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76 | if((byte[cmd] >> i) & 0x01) send_1();
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77 | else send_0();
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78 | }
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79 |
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80 | for(i=0; i<4; i++) send_1();
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81 |
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82 | _delay_ms(600); // delay before return
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83 | }
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84 |
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85 |
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86 |
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87 |
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88 | void send_header(void)
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89 | {
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90 | unsigned char i = 0;
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91 | const unsigned int header = 0x3B86; // first two bytes in reverse bit order
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92 |
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93 | DDRB |= (1<<PB0); // 8ms pulse 40khz
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94 | cnt = 0;
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95 | while(cnt < 641);
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96 | DDRB &= ~(1<<PB0); // 4ms space
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97 | cnt = 0;
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98 | while(cnt < 321);
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99 | DDRB |= (1<<PB0); // 550us pulse 40khz
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100 | cnt = 0;
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101 | while(cnt < 45);
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102 | DDRB &= ~(1<<PB0);
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103 |
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104 | for(i=0; i<16; i++) // send first 16 bits
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105 | {
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106 | if((header >> i) & 0x01) send_1();
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107 | else send_0();
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108 | }
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109 | }
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110 |
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111 |
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112 | void send_1(void)
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113 | {
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114 | DDRB &= ~(1<<PB0); // 1677us space
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115 | cnt = 0;
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116 | while(cnt < 135);
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117 | DDRB |= (1<<PB0); // 559us pulse 40khz
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118 | cnt = 0;
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119 | while(cnt < 46);
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120 | DDRB &= ~(1<<PB0);
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121 | }
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122 |
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123 | void send_0(void)
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124 | {
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125 | DDRB &= ~(1<<PB0); // 559us space
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126 | cnt = 0;
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127 | while(cnt < 46);
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128 | DDRB |= (1<<PB0); // 559us pulse 40khz
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129 | cnt = 0;
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130 | while(cnt < 46);
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131 | DDRB &= ~(1<<PB0);
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132 | }
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133 |
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134 |
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135 |
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136 |
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137 | ISR(TIMER2_COMP_vect)
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138 | {
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139 | PORTB ^= (1<<PB0);
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140 | cnt++;
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141 | }
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