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Delay loop using 16 bit timer/counter

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This commit is contained in:
Michael Mandl 2017-03-02 08:21:17 +01:00
parent 99ccb12a0f
commit 224379a37e
2 changed files with 9 additions and 25 deletions
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5
Hardware.h
View file

@ -2,5 +2,6 @@
#define F_CPU 1000000
void delay_ms(double delay);
void delay_us(double delay);
#include <stdint.h>
void delay_us(const uint16_t delay);

29
hardware.cpp
View file

@ -1,34 +1,17 @@
#include "hardware.h"
#include "avr/io.h"
void delay_ms(double delay)
void delay_us(uint16_t delay)
{
// prescaler: 1024
TCCR0B = (1 << CS02) | (1 << CS00);
TCNT0 = 0;
TCCR1B = (1 << CS10);
TCNT1 = 0;
while (TCNT0 <= delay)
while (true)
{
if (TCNT0 >= 49)
if (TCNT1 >= delay)
{
delay -= 50;
TCNT0 = 0;
return;
}
}
}
void delay_us(double delay)
{
// prescaler: 1
TCCR0B = (1 << CS00);
TCNT0 = 0;
while (TCNT0 <= delay)
{
if (TCNT0 >= 50)
{
delay -= 50;
TCNT0 = 0;
}
}
}