avr/avr_demo
avr/avr_demo
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Remove timer since it is not used.

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This commit is contained in:
Mika Tuupola 2011-10-16 21:36:50 +03:00
parent dc94445695
commit e1bbbd1357
3 changed files with 1 additions and 89 deletions
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2
74hc165_piso/Makefile
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@ -51,7 +51,7 @@ FORMAT = ihex
TARGET = main
# List C source files here. (C dependencies are automatically generated.)
SRC = $(TARGET).c uart_async.c timer.c
SRC = $(TARGET).c uart_async.c
# List Assembler source files here.
# Make them always end in a capital .S. Files ending in a lowercase .s

63
74hc165_piso/timer.c
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@ -1,63 +0,0 @@
/*
* Low resolution implementation of timer using a 8 bit clock with prescaler,
* etc. Clicks approximately every millisecond. Microseconds are not available,
* and any queries to the function will just return milliseconds * 1000.
* You can use this file when you don't need high resolution timing, and don't care
* about slight clock drift, inaccuracy, etc. For timing most human-related activities,
* though, it should be more than sufficient.
*/
#include "timer.h"
static volatile uint64_t _timer_millis;
/*
* Initializes the timer, and resets the timer count to 0. Sets up the ISRs
* linked with timer0.
*/
void timer_init(){
//Set up the timer to run at F_CPU / 256, in normal mode (we reset TCNT0 in the ISR)
TCCR0A = 0x0;
TCCR0B |= _BV(CS02);
//Set compare value to be F_CPU / 1000 -- fire interrupt every millisecond
OCR0A = F_CPU / 256 / 1000;
//Enable compare interrupt
TIMSK0 = _BV(OCIE0A);
//Reset count variables
_timer_millis = 0;
//Enable interrupts if the NO_INTERRUPT_ENABLE define is not set. If it is, you need to call sei() elsewhere.
#ifndef NO_INTERRUPT_ENABLE
sei();
#endif
DDRB = 0xFF;
}
/*
* Returns the number of milliseconds which have elapsed since the
* last time timer_init() was called. Overflows after about 49 days.
*/
uint64_t timer_millis(){
return _timer_millis;
}
/*
* Returns the number of microseconds which have elapsed since the
* last time timer_init() was called. Overflows after about 71 minutes.
*/
uint64_t timer_micros(){
return (_timer_millis * 1000);
}
/*
* The ISR for timer0 overflow. Increment the _timer_count here, and do the calculcations
* to increment _timer_millis as needed.
*/
ISR(TIMER0_COMPA_vect){
TCNT0 = 0;
_timer_millis++;
}

25
74hc165_piso/timer.h
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@ -1,25 +0,0 @@
#ifndef TIMER_H
#define TIMER_H
#include <avr/io.h>
#include <avr/interrupt.h>
/*
* Initializes the timer, and resets the timer count to 0. Sets up the ISRs
* linked with timer1.
*/
void timer_init();
/*
* Returns the number of milliseconds which have elapsed since the
* last time timer_init() was called. Overflows after about 49 days.
*/
uint64_t timer_millis();
/*
* Returns the number of microseconds which have elapsed since the
* last time timer_init() was called. Overflows after about 71 minutes.
*/
uint64_t timer_micros();
#endif