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| 1 | /****************************************************************************** |
1 | /****************************************************************************** |
| 2 | * Copyright (C) 2005 Martin THOMAS, Kaiserslautern, Germany |
2 | * Copyright (C) 2005 Martin THOMAS, Kaiserslautern, Germany |
| 3 | * <eversmith@heizung-thomas.de> |
3 | * <eversmith@heizung-thomas.de> |
| 4 | * http://www.siwawi.arubi.uni-kl.de/avr_projects |
4 | * http://www.siwawi.arubi.uni-kl.de/avr_projects |
| 5 | ***************************************************************************** |
5 | ***************************************************************************** |
| 6 | * |
6 | * |
| 7 | * File : timebase.c |
7 | * File : timebase.c |
| 8 | * Version : 0.9 |
8 | * Version : 0.9 |
| 9 | * |
9 | * |
| 10 | * Summary : AVR Timebase using Hardware-Timer 0 |
10 | * Summary : AVR Timebase using Hardware-Timer 0 |
| 11 | * |
11 | * |
| 12 | *****************************************************************************/ |
12 | *****************************************************************************/ |
| 13 | 13 | ||
| 14 | #include <inttypes.h> |
14 | #include <inttypes.h> |
| 15 | #include <avr/io.h> |
15 | #include <avr/io.h> |
| 16 | #include <avr/signal.h> |
- | |
| 17 | #include <avr/interrupt.h> |
16 | #include <avr/interrupt.h> |
| 18 | 17 | ||
| 19 | #include "timebase.h" |
18 | #include "timebase.h" |
| 20 | 19 | ||
| 21 |
|
20 | ISR(SIG_OVERFLOW0) |
| 22 | { |
21 | { |
| 23 | gMilliSecTick++; |
22 | gMilliSecTick++; |
| 24 | TCNT0 = TIMEBASE_RELOAD; |
23 | TCNT0 = TIMEBASE_RELOAD; |
| 25 | } |
24 | } |
| 26 | 25 | ||
| 27 | void timebase_init(void) |
26 | void timebase_init(void) |
| 28 | { |
27 | { |
| 29 | TCCR0 = (1<<CS01) | (1<<CS00); // prescaler: 64 |
28 | TCCR0 = (1<<CS01) | (1<<CS00); // prescaler: 64 |
| 30 | TCNT0 = TIMEBASE_RELOAD; // set initial reload-value |
29 | TCNT0 = TIMEBASE_RELOAD; // set initial reload-value |
| 31 | TIFR |= (1<<TOV0); // clear overflow int. |
30 | TIFR |= (1<<TOV0); // clear overflow int. |
| 32 | TIMSK |= (1<<TOIE0); // enable overflow-interrupt |
31 | TIMSK |= (1<<TOIE0); // enable overflow-interrupt |
| 33 | } |
32 | } |
| 34 | 33 | ||
| 35 | uint16_t timebase_actTime(void) |
34 | uint16_t timebase_actTime(void) |
| 36 | { |
35 | { |
| 37 | uint8_t sreg; |
36 | uint8_t sreg; |
| 38 | uint16_t res; |
37 | uint16_t res; |
| 39 | 38 | ||
| 40 | sreg=SREG; |
39 | sreg=SREG; |
| 41 | cli(); |
40 | cli(); |
| 42 | 41 | ||
| 43 | res = gMilliSecTick; |
42 | res = gMilliSecTick; |
| 44 | 43 | ||
| 45 | SREG=sreg; |
44 | SREG=sreg; |
| 46 | 45 | ||
| 47 | return res; |
46 | return res; |
| 48 | } |
47 | } |
| 49 | 48 | ||
| 50 | uint16_t timebase_passedTimeMS(uint16_t t0) |
49 | uint16_t timebase_passedTimeMS(uint16_t t0) |
| 51 | { |
50 | { |
| 52 | uint8_t sreg; |
51 | uint8_t sreg; |
| 53 | uint16_t res; |
52 | uint16_t res; |
| 54 | 53 | ||
| 55 | sreg=SREG; |
54 | sreg=SREG; |
| 56 | cli(); |
55 | cli(); |
| 57 | 56 | ||
| 58 | res = (uint16_t)(gMilliSecTick-t0); |
57 | res = (uint16_t)(gMilliSecTick-t0); |
| 59 | 58 | ||
| 60 | SREG=sreg; |
59 | SREG=sreg; |
| 61 | 60 | ||
| 62 | return res; |
61 | return res; |
| 63 | } |
62 | } |
| 64 | 63 | ||
| 65 | 64 | ||
| 66 | 65 | ||