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[ADD] interrupt isr

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Sem van der Hoeven
2021-03-18 19:21:10 +01:00
parent 2e07ed8d89
commit 25da06b589
1 changed files with 37 additions and 9 deletions
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46
Microcontrollers/ultrasonicSensor/main.c
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@@ -4,16 +4,16 @@
* Created: 17-3-2021 09:47:12 * Created: 17-3-2021 09:47:12
* Author : Sem * Author : Sem
ultrasoon op timer 1 want 16 bits
timer aanzetten met tccrn1
interrupt op falling edge van echo
in interrupt timer op 0 zetten en tccrn1 op 0
interrupt op rising edge in echo, interrupt op rising edge in echo,
dan timer aanzetten dan timer1 aanzetten -> timer1 want 16 bits en willen nauwkeurig afstand kunnen meten, en afstand kan van 2 cm tot 4 m, dus willen zeker zijn dat het past
en interrupt zetten op falling edge in echo en interrupt zetten op falling edge in echo
als falling edge interrupt geeft -> als falling edge interrupt geeft ->
waarde uit timer uitlezen waarde uit timer1 uitlezen
en formule gebruiken high level time * velocity (340M/S) / 2 en formule gebruiken high level time * velocity (340M/S) / 2
timer1 uitzetten
interrupt weer op rising edge van echo zetten
*/ */
#define F_CPU 20e6 #define F_CPU 20e6
@@ -23,6 +23,10 @@
#include "lcd_control.h" #include "lcd_control.h"
enum interrupt_status {INTERRUPT_FALLING, INTERRUPT_RISING};
static enum interrupt_status int_stat = INTERRUPT_RISING;
void wait_us(unsigned int us) void wait_us(unsigned int us)
{ {
for(int i = 0; i < us; i++) for(int i = 0; i < us; i++)
@@ -40,18 +44,42 @@ void wait_ms(unsigned int ms)
} }
} }
void ultrasonic_send_pulse()
{
PORTG = 0x00; // 10 us low pulse
wait_us(10);
PORTG = 0x01;
}
ISR(INT0_vect)
{
// set interrupt pin 0 on PORTD to falling edge
if (int_stat == INTERRUPT_RISING)
{
int_stat = INTERRUPT_FALLING;
} else {
int_stat = INTERRUPT_RISING;
}
}
int main(void) int main(void)
{ {
DDRG = 0x01; // port g pin 0 on output, 1 on input. 0 is trig, 1 is echo DDRG = 0x01; // port g pin 0 on output, 1 on input. 0 is trig, 1 is echo
EICRA |= 0x03; // interrupt PORTD on pin 0, rising edge
EIMSK |= 0x01; // enable interrupt on pin 0 (INT0)
sei(); // turn on interrupt system
/* Replace with your application code */ /* Replace with your application code */
while (1) while (1)
{ {
PORTG = 0x00; // 10 us low pulse ultrasonic_send_pulse();
wait_us(10);
PORTG = 0x01;
wait_ms(100); wait_ms(100);
} }