scoutece / paintboard / code / geiger.c @ 11c945d9
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| 1 | 11c945d9 | Julian Binder | #include <avr/io.h> |
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| 2 | #include <avr/interrupt.h> |
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| 3 | #include <stdlib.h> |
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| 4 | #include "geiger.h" |
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| 5 | |||
| 6 | |||
| 7 | int16_t count; |
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| 8 | int16_t rate; |
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| 9 | int16_t ticks; |
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| 10 | |||
| 11 | void geiger_init()
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| 12 | {
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| 13 | EICRA |= _BV(ISC11) | _BV(ISC10); |
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| 14 | EIMSK |= _BV(INT1); |
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| 15 | } |
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| 16 | |||
| 17 | void geiger_tick()
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| 18 | {
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| 19 | ticks++; |
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| 20 | if(ticks==100) |
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| 21 | {
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| 22 | ticks=0;
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| 23 | rate = count*3;
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| 24 | count = 0;
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| 25 | } |
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| 26 | } |
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| 27 | |||
| 28 | int16_t geiger_rate() |
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| 29 | {
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| 30 | return (rate==0)?count:rate; |
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| 31 | } |
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| 32 | |||
| 33 | ISR (INT1_vect) |
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| 34 | {
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| 35 | count++; |
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| 36 | } |