RTC init and timer

prosjekt.X/fan speeeed.h

@@ -14,17 +14,18 @@
 extern "C" {
 #endif
 
-    #include <stdbool.h>
-    #include <float.h>    
-    #include <stdio.h>
-    #include <stdlib.h>
-    #include <stdint.h>
-    #include <math.h>
-    #include <avr/interrupt.h>
-
-    
-    int fan_speed(float value);
-
+#include <stdbool.h>
+#include <float.h>    
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <math.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <avr/cpufunc.h>
+    int RTC_init();
+    int fan_speed(float voltage_value);
+    inline void fan_speed_toggle();
 
 #ifdef	__cplusplus
 }

prosjekt.X/fan speeeeeeeed.c

@@ -1,32 +1,76 @@
 
 #include "fan speeeed.h"
+RTC.PITCTRLA = RTC_PERIOD_CYC32768_gc | RTC_PITEN_bm;
 
-int fan_speed(float voltage_value){
-        init_millis()
-        sei();
-        float fan_speed;
-        float t = 0;
-        float past_time = 0;
-        float start_time = 0;
-        int old_value = 0;
-        int f;
-        if (voltage_value > 300 && old_value < 300){
-            start_time =  init_millis()
-            t =(start_time - past_time);
-            past_time = start_time;
-        }
-        voltage_value = old_value;
-        f = ((1/t)*1000);
-        fan_speed = (f*60)/2;
-        return fan_speed;
+int RTC_init() {
+    uint8_t temp;
+    /* Initialize 32.768kHz Oscillator: */
+    /* Disable oscillator: */
+    temp = CLKCTRL.XOSC32KCTRLA;
+    temp &= ~CLKCTRL_ENABLE_bm;
+    /* Writing to protected register */
+    ccp_write_io((void*) &CLKCTRL.XOSC32KCTRLA, temp);
+
+    while (CLKCTRL.MCLKSTATUS & CLKCTRL_XOSC32KS_bm) {
+        ; /* Wait until XOSC32KS becomes 0 */
     }
+    /* SEL = 0 (Use External Crystal): */
+    temp = CLKCTRL.XOSC32KCTRLA;
+    temp &= ~CLKCTRL_SEL_bm;
+    /* Writing to protected register */
+    ccp_write_io((void*) &CLKCTRL.XOSC32KCTRLA, temp);
+
+    /* Enable oscillator: */
+    temp = CLKCTRL.XOSC32KCTRLA;
+    temp |= CLKCTRL_ENABLE_bm;
+    /* Writing to protected register */
+    ccp_write_io((void*) &CLKCTRL.XOSC32KCTRLA, temp);
+
+    /* Initialize RTC: */
+    while (RTC.STATUS > 0) {
+        ; /* Wait for all register to be synchronized */
+    }
+    /* 32.768kHz External Crystal Oscillator (XOSC32K) */
+    RTC.CLKSEL = RTC_CLKSEL_TOSC32K_gc;
+    /* Run in debug: enabled */
+    RTC.DBGCTRL = RTC_DBGRUN_bm;
+
+    RTC.PITINTCTRL = RTC_PI_bm; /* Periodic Interrupt: enabled */
+
+    RTC.PITCTRLA = RTC_PERIOD_CYC32768_gc /* RTC Clock Cycles 32768 */
+            | RTC_PITEN_bm; /* Enable: enabled */
 
-ISR(PORTB_PORT_vect)
-{
-	static int counter = 0;
-	if (counter >=5){
-		PORTB.OUT ^= 0x0F;
-		counter = 0; 
-	}
-    PORTB.INFLAFS = PIN2_bm;
+}
+
+int fan_speed(float voltage_value) {
+    int counter = 0;
+    int old_value = 0;
+    
+    if (voltage_value > 300 && old_value < 300) {
+        counter++;
+    }
+    voltage_value = old_value;
+    return old_value;
+}
+
+inline void fan_speed_toggle() {
+    float fan_speed;
+    float t = 0;
+    f = ((1 / t)*1000);
+    fan_speed = (f * 60) / 2;
+    return fan_speed;
+}
+
+ISR(RTC_PIT_vect) {
+    RTC.PITINTFLAGS = RTC_PI_bm;
+    fan_speed_toggle();
+}
+
+int main(void) {
+    fan_speed();
+    RTC_init();
+    sei();
+    while (1) {
+
+    }
 }