timer not worke

prosjekt.X/fan_speeeed.c

@@ -74,16 +74,24 @@ void init_ac0(){
 }
 
 void test(){
-    printf("yo");
+    printf("yo %u", falling_edge_counter);
 }
 
 ISR(AC0_AC_vect){ // AC0 vec flag 
+    cli();
     AC0.STATUS |= 0x10; //CMP flag to 0.
     falling_edge_counter++;
     //printf("yo");
     test();
+    sei();
 }
 
+ISR (TCA0_OVF_vect) {
+    cli();
+    RPM_calculation(falling_edge_counter,1E-3);
+    TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
+    sei();
+}
 
 
 //-----------------------------------------------------------------------------------------------------

prosjekt.X/main.c

@@ -36,6 +36,7 @@ int main(void) {
     init_uart((uint16_t)9600);
     stdout = &USART_stream;
     init_TCA0();
+    TCA0_update_period_ms();
     init_ac0();
     sei();