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Restore accidentally deleted code in 4e61155

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This commit is contained in:
Rihards Skuja 2018-01-19 20:06:26 +02:00
parent 6c94180d77
commit 92c3842ca9
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GPG Key ID: 53FA13A3F7F8571B
1 changed files with 7 additions and 3 deletions
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10
robot/src/sonar.c
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@ -5,7 +5,7 @@
#include "led.h"
volatile uint32_t trig_counter;
uint32_t no_of_ticks;
volatile uint32_t no_of_ticks;
void init_sonar(void)
{
@ -36,15 +36,19 @@ uint16_t read_sonar(void)
sei();
// Count cycles until ECHO goes low
while (CHK(ECHO_PIN, ECHO_BIT)) {
++no_of_ticks;
if (no_of_ticks > SONAR_TIMEOUT) {
if (no_of_ticks + TCNT1 > SONAR_TIMEOUT) {
return SONAR_ERROR;
}
}
TCCR1B = 0x00;
cli();
no_of_ticks += TCNT1;
return (uint16_t)(no_of_ticks / (CYCLES_PER_US * 58));
}
ISR(TIMER1_OVF_vect)
{
no_of_ticks += TIMER_MAX;
}