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This file contains the function implementation for the timer functions. Refer to the timer.h file for more details.
Copyright (c) 2006, Atmel Corporation All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. The name of ATMEL may not be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Definition in file timer.c.
#include "timer.h"
#include "common.h"
#include "config.h"
Include dependency graph for timer.c:
Go to the source code of this file.
Defines | |
| #define | SHORT_TIMEOUT_VALUE 100 |
| #define | TIMER_PRESCALER_VALUE ((1<<CS12) | (0<<CS11) | (1<<CS10)) |
Functions | |
| __interrupt void | longTimeoutHandler (void) |
| __interrupt void | shortTimeoutHandler (void) |
| void | startLongTimeout (void) |
| void | startShortTimeout (void) |
| void | stopTimer (void) |
Variables | |
| volatile bool | longTimeout |
| static byte | longTimeoutHighCounter |
| volatile bool | shortTimeout |
| #define SHORT_TIMEOUT_VALUE 100 |
Short timeout delay = 100 = approx. 12.8 ms timeout @ 8 MHz.
Definition at line 57 of file timer.c.
Referenced by startShortTimeout().
| #define TIMER_PRESCALER_VALUE ((1<<CS12) | (0<<CS11) | (1<<CS10)) |
Timeout prescaler = CPUCLK/1024 = approx. 0.128 ms @ 8MHz.
Definition at line 55 of file timer.c.
Referenced by startLongTimeout(), and startShortTimeout().
| __interrupt void longTimeoutHandler | ( | void | ) |
ISR called when one 8.39 second period expires when waiting for a long timeout.
Definition at line 83 of file timer.c.
References LONG_TIMEOUT_LO_VALUE, longTimeout, and longTimeoutHighCounter.
00084 { 00085 // Count down. 00086 if( longTimeoutHighCounter > 0 ) { 00087 if( --longTimeoutHighCounter == 0 ) { 00088 OCR1B = TCNT1 + LONG_TIMEOUT_LO_VALUE; 00089 } 00090 } else { 00091 // Set timeout flag. 00092 longTimeout = true; 00093 // Disable this interrupt. 00094 TIMSK1 &= ~(1<<OCIE1B); 00095 } 00096 }
| __interrupt void shortTimeoutHandler | ( | void | ) |
ISR called when short timeout expires.
Definition at line 71 of file timer.c.
References shortTimeout.
00072 { 00073 // Set timeout flag. 00074 shortTimeout = true; 00075 // Disable this interrupt. 00076 TIMSK1 &= ~(1<<OCIE1A); 00077 }
| void startLongTimeout | ( | void | ) |
Clear flag and restart long timeout delay.
Definition at line 117 of file timer.c.
References LONG_TIMEOUT_HI_VALUE, longTimeout, longTimeoutHighCounter, and TIMER_PRESCALER_VALUE.
Referenced by learnMode().
00118 { 00119 // Clear timeout flag. 00120 longTimeout = false; 00121 // Initialize countdown value. 00122 longTimeoutHighCounter = LONG_TIMEOUT_HI_VALUE; 00123 // Initialize compare value to one less than 00124 // current counter value, so that we do not get 00125 // an interrupt immediately. 00126 OCR1B = TCNT1 - 1; 00127 // Clear pending interrupt flag. 00128 TIFR1 |= (1<<OCF1B); 00129 // Enable interrupt. 00130 TIMSK1 |= (1<<OCIE1B); 00131 // Start timer/counter if not started yet. 00132 TCCR1B = TIMER_PRESCALER_VALUE; 00133 }
| void startShortTimeout | ( | void | ) |
Clear flag and restart short timeout delay.
Definition at line 100 of file timer.c.
References SHORT_TIMEOUT_VALUE, shortTimeout, and TIMER_PRESCALER_VALUE.
Referenced by rxClockLineHandler().
00101 { 00102 // Clear timeout flag. 00103 shortTimeout = false; 00104 // Initialize compare value relative 00105 // to current timer value. 00106 OCR1A = TCNT1 + SHORT_TIMEOUT_VALUE; 00107 // Clear pending interrupt flag. 00108 TIFR1 |= (1<<OCF1A); 00109 // Enable interrupt. 00110 TIMSK1 |= (1<<OCIE1A); 00111 // Start timer/counter if not started yet. 00112 TCCR1B = TIMER_PRESCALER_VALUE; 00113 }
| void stopTimer | ( | void | ) |
Stop both timers and clear flags.
Definition at line 137 of file timer.c.
References longTimeout, and shortTimeout.
Referenced by learnMode(), and main().
00138 { 00139 TCCR1B = 0x00; 00140 shortTimeout = false; 00141 longTimeout = false; 00142 }
| volatile bool longTimeout |
Timeout flag set if long timeout occurs.
Definition at line 62 of file timer.c.
Referenced by learnMode(), longTimeoutHandler(), startLongTimeout(), and stopTimer().
byte longTimeoutHighCounter [static] |
Countdown for high part of long delay.
Definition at line 65 of file timer.c.
Referenced by longTimeoutHandler(), and startLongTimeout().
| volatile bool shortTimeout |
Timeout flag set if short timeout occurs.
Definition at line 61 of file timer.c.
Referenced by receiverTimedOut(), shortTimeoutHandler(), startShortTimeout(), and stopTimer().
Generated on Fri Aug 8 11:04:07 2008 for AVR411 Secure Rolling Code Algorithm (Receiver) by  1.4.7
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