added simple IR receiver burst recording
This commit is contained in:
parent
e310bb4a85
commit
ec8defaa99
142
src/main.c
142
src/main.c
|
@ -10,22 +10,37 @@
|
||||||
#include "uart.h"
|
#include "uart.h"
|
||||||
|
|
||||||
/* global variables */
|
/* global variables */
|
||||||
volatile uint8_t pwr_ok;
|
volatile uint8_t pwr_ok; /* is power ok */
|
||||||
volatile uint8_t fan;
|
volatile uint8_t fan; /* fan signal state, to measure tachometer */
|
||||||
volatile uint16_t tachometer = 0;
|
volatile uint8_t timer2_ovf = 0; /* to measure fan speed using timer 2 */
|
||||||
volatile uint8_t timer2_ovf = 0;
|
static const uint16_t TIMER2_PRESCALE[8] = {0,1,8,32,64,128,256,1024}; /* timer 2 CS2[2:0] values */
|
||||||
|
volatile uint16_t tachometer = 0; /* the tachometer time (from timer) */
|
||||||
|
volatile uint8_t ir; /* IR signal state, to measure IR code */
|
||||||
|
volatile uint8_t pulse_i = 1; /* pulse index */
|
||||||
|
# define PULSE_MAX 64 /* maximum number of pulses to save */
|
||||||
|
volatile uint16_t pulse[PULSE_MAX]; /* pulse times (from timer) */
|
||||||
|
|
||||||
const uint16_t TIMER2_PRESCALE[8] = {0,1,8,32,64,128,256,1024};
|
|
||||||
|
|
||||||
/* PWR_OK interrupt */
|
/* power ok interrupt */
|
||||||
ISR(PCINT0_vect) { /* PCI0 Interrupt Vector for PCINT[7:0] */
|
ISR(PCINT0_vect) { /* PCI0 Interrupt Vector for PCINT[7:0] */
|
||||||
if (pwr_ok!=(PINB&(1<<PWR_OK))) { /* did the PWR_OK pin state changed */
|
if (pwr_ok!=(PINB&(1<<PWR_OK))) { /* did the PWR_OK pin state changed */
|
||||||
pwr_ok = PINB&(1<<PWR_OK); /* save new state */
|
pwr_ok = PINB&(1<<PWR_OK); /* save new state */
|
||||||
if (pwr_ok) {
|
if (pwr_ok) {
|
||||||
|
/* switch timer 2 on to start measuring the fan speed */
|
||||||
puts("power ok");
|
puts("power ok");
|
||||||
} else {
|
} else {
|
||||||
puts("power ko");
|
puts("power ko");
|
||||||
}
|
}
|
||||||
|
} else if (ir!=(PINB&(1<<IR))) { /* did the IR pin state changed */
|
||||||
|
ir = PINB&(1<<IR); /* save new state */
|
||||||
|
if (pulse_i>0) { /* save pulse, except the first */
|
||||||
|
pulse[pulse_i-1] = TCNT1;
|
||||||
|
pulse[pulse_i] = 0;
|
||||||
|
}
|
||||||
|
if (pulse_i<PULSE_MAX-1) { /* prepare to save next pulse */
|
||||||
|
pulse_i++;
|
||||||
|
}
|
||||||
|
TCNT1 = 0; /* clear timer 1 */
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -33,18 +48,26 @@ ISR(PCINT0_vect) { /* PCI0 Interrupt Vector for PCINT[7:0] */
|
||||||
ISR(PCINT1_vect) { /* PCI0 Interrupt Vector for PCINT[14:8] */
|
ISR(PCINT1_vect) { /* PCI0 Interrupt Vector for PCINT[14:8] */
|
||||||
if (fan!=(PINC&(1<<FAN))) { /* did the FAN pin state changed */
|
if (fan!=(PINC&(1<<FAN))) { /* did the FAN pin state changed */
|
||||||
fan = PINC&(1<<FAN); /* save new state */
|
fan = PINC&(1<<FAN); /* save new state */
|
||||||
if (fan) {
|
if (fan) { /* only react to rising edge */
|
||||||
tachometer = timer2_ovf*256+TCNT2; /* save time */
|
tachometer = (uint16_t)(timer2_ovf<<8)+TCNT2; /* save time */
|
||||||
TCNT2 = 0; /* reset timer 2 */
|
TCNT2 = 0; /* reset timer 2 */
|
||||||
timer2_ovf = 0; /* reset timer 2 overflow counter */
|
timer2_ovf = 0; /* reset timer 2 */
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
/* timer 2 interrupt used to measure fan tachometer */
|
/* timer 2 interrupt used to measure fan speed based on tachometer */
|
||||||
ISR(TIMER2_OVF_vect) { /* timer 2 overflow interrupt verctor */
|
ISR(TIMER2_OVF_vect) { /* timer 2 overflow interrupt vector */
|
||||||
if(pwr_ok) { /* only measure tachometer if power is ok */
|
if (timer2_ovf<0xff) { /* prevent overflow */
|
||||||
timer2_ovf++; /* increase time 2 overflow counter */
|
timer2_ovf++; /* increase tachometer counter */
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* timer 1 interrupt used to measure IR pulse */
|
||||||
|
ISR(TIMER1_COMPA_vect) { /* timer 1 OCR1A match interrupt vector */
|
||||||
|
if (pulse_i>0) {
|
||||||
|
pulse_i = 0;
|
||||||
|
OCR0A = ~OCR0A;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -59,38 +82,9 @@ static void ioinit(void)
|
||||||
PCICR |= (1<<PCIE0); /* enable interrupt for PCINT[7:0] */
|
PCICR |= (1<<PCIE0); /* enable interrupt for PCINT[7:0] */
|
||||||
PCMSK0 |= (1<<PCINT1); /* enable interrupt for PCINT1 */
|
PCMSK0 |= (1<<PCINT1); /* enable interrupt for PCINT1 */
|
||||||
|
|
||||||
/* configure peripherals */
|
|
||||||
DDRB &= ~(1<<IR); /* IR receiver is input */
|
|
||||||
|
|
||||||
/* configure FAN */
|
|
||||||
DDRC &= ~(1<<FAN); /* FAN (PC5/PCINT13) is input */
|
|
||||||
fan = PINC&(1<<FAN); /* save state */
|
|
||||||
PCIFR &= ~(1<<PCIF1); /* clear interrupt flag */
|
|
||||||
PCICR |= (1<<PCIE1); /* enable interrupt for PCINT[14:8] */
|
|
||||||
PCMSK1 |= (1<<PCINT13); /* enable interrupt for PCINT1 */
|
|
||||||
/* use timer 2 to measure the tachometer */
|
|
||||||
/* use normal mode */
|
|
||||||
TCCR2A &= ~((1<<WGM20)|(1<<WGM21));
|
|
||||||
TCCR2B &= ~(1<<WGM22);
|
|
||||||
/* /256 prescale timer */
|
|
||||||
TCCR2B |= (1<<CS22)|(1<<CS21);
|
|
||||||
TCCR2B &= ~(1<<CS20);
|
|
||||||
TIFR2 &= ~(1<<TOV2); /* clear timer 2 overflow interrupt flag */
|
|
||||||
TIMSK2 |= (1<<TOIE2); /* enable timer 2 overflow interrupt */
|
|
||||||
|
|
||||||
/* configure channels (used for powering LEDs using an nMOS) */
|
|
||||||
DDRC |= (1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5); /* CH1_x is output */
|
|
||||||
PORTC &= ~((1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5)); /* switch off CH1_x */
|
|
||||||
DDRD |= (1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5); /* CH2_x is output */
|
|
||||||
PORTD &= ~((1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5)); /* switch off CH2_x */
|
|
||||||
|
|
||||||
/* use UART as terminal */
|
|
||||||
uart_init();
|
|
||||||
stdout = &uart_output;
|
|
||||||
stdin = &uart_input;
|
|
||||||
|
|
||||||
/* configure LED (on PD6/OC0A) */
|
/* configure LED (on PD6/OC0A) */
|
||||||
DDRD |= (1<<LED); /* LED is output */
|
DDRD |= (1<<LED); /* LED is output */
|
||||||
|
/* use timer 1 to produce a PWM */
|
||||||
/* use phase correct PWM mode (because fast PWM is always on for at least 1 cycle) */
|
/* use phase correct PWM mode (because fast PWM is always on for at least 1 cycle) */
|
||||||
TCCR0A &= ~(1<<WGM01);
|
TCCR0A &= ~(1<<WGM01);
|
||||||
TCCR0A |= (1<<WGM00);
|
TCCR0A |= (1<<WGM00);
|
||||||
|
@ -103,6 +97,51 @@ static void ioinit(void)
|
||||||
/* start with LED on */
|
/* start with LED on */
|
||||||
OCR0A = 0xff;
|
OCR0A = 0xff;
|
||||||
|
|
||||||
|
/* configure FAN */
|
||||||
|
DDRC &= ~(1<<FAN); /* FAN (PC5/PCINT13) is input */
|
||||||
|
fan = PINC&(1<<FAN); /* save state */
|
||||||
|
PCIFR &= ~(1<<PCIF1); /* clear interrupt flag */
|
||||||
|
PCICR |= (1<<PCIE1); /* enable interrupt for PCINT[14:8] */
|
||||||
|
PCMSK1 |= (1<<PCINT13); /* enable interrupt for PCINT1 */
|
||||||
|
/* use timer 2 to measure the tachometer */
|
||||||
|
/* use normal mode */
|
||||||
|
TCCR2A &= ~((1<<WGM20)|(1<<WGM21));
|
||||||
|
TCCR2B &= ~(1<<WGM22);
|
||||||
|
/* clock/64 prescaler */
|
||||||
|
TCCR2B |= (1<<CS22);
|
||||||
|
TCCR2B &= ~((1<<CS21)|(1<<CS20));
|
||||||
|
TIFR2 &= ~(1<<TOV2); /* clear timer 2 overflow interrupt flag */
|
||||||
|
TIMSK2 |= (1<<TOIE2); /* enable timer 2 overflow interrupt */
|
||||||
|
|
||||||
|
/* configure IR receiver */
|
||||||
|
DDRB &= ~(1<<IR); /* IR (PB0/PCINT0) receiver is input */
|
||||||
|
ir = PINB&(1<<IR); /* save state */
|
||||||
|
PCIFR &= ~(1<<PCIF0); /* clear interrupt flag */
|
||||||
|
PCICR |= (1<<PCIE0); /* enable interrupt for PCINT[7:0] */
|
||||||
|
PCMSK0 |= (1<<PCINT0); /* enable interrupt for PCINT0 */
|
||||||
|
/* use timer 1 to measure IR pulse */
|
||||||
|
/* use CTC mode */
|
||||||
|
TCCR1A &= ~((1<<WGM10)|(1<<WGM11));
|
||||||
|
TCCR1B |= (1<<WGM12);
|
||||||
|
TCCR1B &= ~(1<<WGM13);
|
||||||
|
/* clock/8 prescaler, offers most precision for 15ms (up to 28.5ms) */
|
||||||
|
TCCR1B |= (1<<CS11);
|
||||||
|
TCCR1B &= ~((1<<CS12)|(1<<CS10));
|
||||||
|
OCR1A = (uint32_t)(15*F_CPU)/(1000*8); /* set clear time to 15 ms (no IR toggle should be longer) */
|
||||||
|
TIFR1 &= ~(1<<OCF1A); /* clear timer 1 overflow interrupt flag */
|
||||||
|
TIMSK1 |= (1<<OCIE1A); /* enable timer 1 overflow interrupt */
|
||||||
|
|
||||||
|
/* configure channels (used for powering LEDs using an nMOS) */
|
||||||
|
DDRC |= (1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5); /* CH1_x is output */
|
||||||
|
PORTC &= ~((1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5)); /* switch off CH1_x */
|
||||||
|
DDRD |= (1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5); /* CH2_x is output */
|
||||||
|
PORTD &= ~((1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5)); /* switch off CH2_x */
|
||||||
|
|
||||||
|
/* use UART as terminal */
|
||||||
|
uart_init();
|
||||||
|
stdout = &uart_output;
|
||||||
|
stdin = &uart_input;
|
||||||
|
|
||||||
sei(); /* enable interrupts */
|
sei(); /* enable interrupts */
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -112,7 +151,7 @@ int main(void)
|
||||||
|
|
||||||
char input;
|
char input;
|
||||||
|
|
||||||
puts("Hello world!");
|
puts("LED dimmer up & running");
|
||||||
_delay_ms(1000);
|
_delay_ms(1000);
|
||||||
while(1) {
|
while(1) {
|
||||||
input = getchar();
|
input = getchar();
|
||||||
|
@ -238,24 +277,29 @@ int main(void)
|
||||||
if (OCR0A>0) {
|
if (OCR0A>0) {
|
||||||
OCR0A--;
|
OCR0A--;
|
||||||
}
|
}
|
||||||
printf("decreasing LED: %d\n",OCR0A);
|
printf("decreasing LED: %u\n",OCR0A);
|
||||||
break;
|
break;
|
||||||
case '+':
|
case '+':
|
||||||
if (OCR0A<0xff) {
|
if (OCR0A<0xff) {
|
||||||
OCR0A++;
|
OCR0A++;
|
||||||
}
|
}
|
||||||
printf("increasing LED: %d\n",OCR0A);
|
printf("increasing LED: %u\n",OCR0A);
|
||||||
break;
|
break;
|
||||||
case 't':
|
case 't':
|
||||||
if (tachometer) {
|
if (tachometer) {
|
||||||
uint16_t prescale = TIMER2_PRESCALE[TCCR2B&((1<<CS22)|(1<<CS21)|(1<<CS20))];
|
uint16_t prescale = TIMER2_PRESCALE[TCCR2B&((1<<CS22)|(1<<CS21)|(1<<CS20))];
|
||||||
if (prescale) {
|
if (prescale) {
|
||||||
uint32_t speed = ((60*F_CPU)/(prescale*(uint32_t)tachometer))/2;
|
if (timer2_ovf<0xff) {
|
||||||
|
uint32_t speed = ((60*F_CPU)/(prescale*(uint32_t)tachometer))/2; /* calculate speed. 2 pulses per revolution */
|
||||||
printf("fan speed: %lurpm\n",speed);
|
printf("fan speed: %lurpm\n",speed);
|
||||||
printf("fan speed: %lurpm\n",timer2_ovf);
|
} else {
|
||||||
|
printf("fan off (or not detected)\n");
|
||||||
}
|
}
|
||||||
} else {
|
} else {
|
||||||
printf("fan off or too slow\n");
|
printf("fan speed measurement not started\n");
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
printf("fan off (or not detected)\n");
|
||||||
}
|
}
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue