49 lines
983 B
C
49 lines
983 B
C
#include "fan_speeeed.h"
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#include "uart.h"
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uint16_t timer_period_ms = 1;
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uint16_t fan_speed;
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volatile uint16_t falling_edge_counter = 0;
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void TCA0_init() {
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TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm ;
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TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc ; /* Sysclk /1024 */
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TCA0_update_period_ms();
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}
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void TCA0_update_period_ms() {
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TCA0.SINGLE.PERBUF = (F_CPU*(1/timer_period_ms)/1024); /* F_CPU * F_IRQ / TCA_prescaler */
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}
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uint16_t RPM_calculation() {
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fan_speed = (falling_edge_counter/timer_period_ms)*6000*3;
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falling_edge_counter= 0;
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printf("%u", fan_speed);
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return fan_speed;
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}
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void PORT_init(){
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PORTD.PIN2CTRL = PORT_ISC_FALLING_gc;
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}
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ISR ( TCA0_OVF_vect ) {
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cli();
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RPM_calculation();
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TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
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sei();
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}
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ISR(PORTD_PORT_vect){
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cli();
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falling_edge_counter ++;
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PORTD.INTFLAGS = PIN2_bm;
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sei();
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}
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