125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
#include "fan-speed.h"
|
|
#include "uart.h"
|
|
|
|
uint16_t timer_period_ms = 1;
|
|
uint16_t fan_speed = 0;
|
|
volatile uint16_t fan1_edge_counter = 0;
|
|
volatile uint16_t fan2_edge_counter = 0;
|
|
|
|
|
|
void init_TCA0() {
|
|
TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm ;
|
|
TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc ; /* Sysclk /1024 */
|
|
TCA0_update_period(timer_period_ms);
|
|
}
|
|
|
|
void TCA0_update_period(uint16_t timer_period) {
|
|
TCA0.SINGLE.PERBUF = (F_CPU * (1 / timer_period) / 1024); /* F_CPU * F_IRQ / TCA_prescaler */
|
|
}
|
|
|
|
// COUNTINGS / TIME = FREQUENCY
|
|
// FREQ / 2 = GIVES ACTUAL FREQ
|
|
// FREQ * SEC-IN-A-MINUTE(60) / FAN-BLADES
|
|
uint16_t RPM_calculation(uint16_t edge_counter, uint16_t time_ms) {
|
|
fan_speed = (edge_counter / time_ms);
|
|
fan_speed = fan_speed/2;
|
|
fan_speed = fan_speed * 60/5;
|
|
edge_counter = 0;
|
|
return fan_speed;
|
|
}
|
|
|
|
|
|
void init_fan_gpio() {
|
|
// CONFIGURE PINS AS ANALOG INPUTS
|
|
|
|
// PIN FOR FAN 1
|
|
PORTD.DIRSET &= ~PIN6_bm;
|
|
PORTD.PIN6CTRL &= ~ PORT_ISC_gm;
|
|
PORTD.PIN6CTRL = PORT_ISC_INPUT_DISABLE_gc;
|
|
|
|
// PIN FOR FAN 2
|
|
PORTD.DIRSET &= ~PIN4_bm;
|
|
PORTD.PIN4CTRL &= ~ PORT_ISC_gm ;
|
|
PORTD.PIN4CTRL = PORT_ISC_INPUT_DISABLE_gc;
|
|
|
|
// PIN FOR REFRENCE
|
|
PORTD.DIRSET &= PIN7_bm;
|
|
PORTD.PIN7CTRL &= ~ PORT_ISC_gm ;
|
|
PORTD.PIN7CTRL = PORT_ISC_INPUT_DISABLE_gc;
|
|
}
|
|
|
|
void init_AC0(){
|
|
//Wincontroll disabled
|
|
AC0.CTRLB = 0x00;
|
|
|
|
//SELECT POSITIVE AND NEGATIVE INPUTS FOR COMPARRISON
|
|
// FAN USE PD6 COMPARE WITH PD3
|
|
AC0.MUXCTRL = AC_MUXPOS_AINP3_gc | AC_MUXNEG_AINN2_gc;
|
|
|
|
// ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
|
|
AC0.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
|
|
|
|
// TURN ON INTERUPT
|
|
AC0.INTCTRL = 0x01;
|
|
}
|
|
|
|
|
|
void init_AC1(){
|
|
//Wincontroll disabled
|
|
AC1.CTRLB = 0x00;
|
|
|
|
//SELECT POSITIVE AND NEGATIVE INPUTS FOR COMPARRISON
|
|
// FAN USE PD4, COMPARE WITH PD3
|
|
AC1.MUXCTRL = AC_MUXPOS_AINP2_gc | AC_MUXNEG_AINN2_gc;
|
|
|
|
// ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
|
|
AC1.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
|
|
|
|
// TURN ON INTERUPT
|
|
AC1.INTCTRL = 0x01;
|
|
}
|
|
|
|
|
|
ISR(AC0_AC_vect){ // AC0 vec flag
|
|
cli();
|
|
fan1_edge_counter++;
|
|
AC0.STATUS |= 0x10; //CMP flag to 0
|
|
sei();
|
|
}
|
|
|
|
|
|
ISR(AC1_AC_vect){ // AC1 vec flag
|
|
cli();
|
|
fan2_edge_counter++;
|
|
AC1.STATUS |= 0x10; //CMP flag to 0
|
|
sei();
|
|
}
|
|
|
|
// TIMER INTERUPT
|
|
ISR (TCA0_OVF_vect) {
|
|
cli();
|
|
|
|
// Increment the index, or reset if it is at the top
|
|
if (fan1_history_index < 512) {
|
|
fan1_history_index++;
|
|
} else {
|
|
fan1_history_index = 0;
|
|
}
|
|
|
|
if (fan2_history_index < 512) {
|
|
fan2_history_index++;
|
|
} else {
|
|
fan2_history_index = 0;
|
|
}
|
|
|
|
// Calculate the fanspeed
|
|
fan1_history[fan1_history_index] = RPM_calculation(fan1_edge_counter,timer_period_ms);
|
|
fan2_history[fan2_history_index] = RPM_calculation(fan2_edge_counter,timer_period_ms);
|
|
|
|
// Reset the edge counter
|
|
fan1_edge_counter = 0;
|
|
fan2_edge_counter = 0;
|
|
TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
|
|
sei();
|
|
}
|