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Subversion Repositories hf-risc

[/] [hf-risc/] [trunk/] [software/] [app/] [buzzer.c] - Blame information for rev 13

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Line No. Rev Author Line
1 13 serginhofr 
/*
2 
C0 = 16.35
3 
C#0 = 17.32
4 
DO = 18.35
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D#O = 19.45
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EO = 20.60
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F0 = 21.83
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F#0 = 23.12
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G0 = 24.50
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G#O = 25.96
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A0 = 27.50
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A#0 = 29.14
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BO = 30.87
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C1 = 32.70
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C#1 = 34.65
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D1 = 36.71
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D#1 = 38.89
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E1 = 41.20
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F1 = 43.65
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F#1 = 46.25
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G1 = 49.00
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G#1 = 51.91
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A1 = 55.00
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A#1 = 58.27
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B1 = 61.74
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C2 = 65.41
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C#2 = 69.30
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D2 = 73.42
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D#2 = 77.78
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E2 = 82.41
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F2 = 87.31
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F#2 = 92.50
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G2 = 98.00
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G#2 = 103.83
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A2 = 110.00
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A#2 = 116.54
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B2 = 123.47
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C3 = 130.81
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C#3 = 138.59
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D3 = 146.83
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D#3 = 155.56
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E3 = 164.81
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F3 = 174.61
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F#3 = 185.00
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G3 = 196.00
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G#3 = 207.65
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A3 = 220.00
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A#3 = 233.08
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B3 = 246.94
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C4 = 261.63
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C#4 = 277.18
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D4 = 293.66
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D#4 = 311.13
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E4 = 329.63
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F4 = 349.23
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F#4 = 369.99
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G4 = 392.00
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G#4 = 415.30
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A4 = 440.00
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A#4 = 466.16
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B4 = 493.88
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C5 = 523.25
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C#5 = 554.37
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D5 = 587.33
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D#5 = 622.25
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E5 = 659.26
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F5 = 698.46
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F#5 = 739.99
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G5 = 783.99
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G#5 = 830.61
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A5 = 880.00
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A#5 = 932.33
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B5 = 987.77
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C6 = 1046.50
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C#6 = 1108.73
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D6 = 1174.66
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D#6 = 1244.51
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E6 = 1318.51
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F6 = 1396.91
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F#6 = 1479.98
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G6 = 1567.98
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G#6 = 1661.22
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A6 = 1760.00
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A#6 = 1864.66
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B6 = 1975.53
92 
 
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C7 = 2093.00
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C#7 = 2217.46
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D7 = 2349.32
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D#7 = 2489.02
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E7 = 2637.02
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F7 = 2793.83
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F#7 = 2959.96
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G7 = 3135.96
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G#7 = 3322.44
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A7 = 3520.00
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A#7 = 3729.31
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B7 = 3951.07
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*/
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#include <hf-risc.h>
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#define BUZZER_PIN      0x08
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volatile int32_t freq = 1, extio_out;
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void compare_handler(void){
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        COMPARE = COUNTER + (CPU_SPEED / freq);
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        extio_out ^= BUZZER_PIN;
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        EXTIO_OUT = extio_out;
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}
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int main(void){
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        extio_out = 0;
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        EXTIO_OUT = extio_out;
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        // register counter compare interrupt
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        interrupt_register(IRQ_COMPARE, compare_handler);
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        // initialize compare registers, clear compare irqs
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        COMPARE = COUNTER + (CPU_SPEED/1000);
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        // set interrupt mask (unmask peripheral interrupts)
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        IRQ_MASK = IRQ_COMPARE;
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        // global interrupts enable
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        IRQ_STATUS = 1;
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        for(;;){
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                // play a chromatic scale from C4 to B4
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                freq = 262;     delay_ms(250);
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                freq = 277;     delay_ms(250);
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                freq = 294;     delay_ms(250);
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                freq = 311;     delay_ms(250);
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                freq = 330;     delay_ms(250);
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                freq = 349;     delay_ms(250);
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                freq = 370;     delay_ms(250);
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                freq = 392;     delay_ms(250);
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                freq = 415;     delay_ms(250);
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                freq = 440;     delay_ms(250);
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                freq = 466;     delay_ms(250);
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                freq = 494;     delay_ms(250);
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                // pause for 1 s
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                freq = 1;       delay_ms(1000);
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        }
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}

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