added softtimer to slave

firmware/masterchip/main.c

@@ -3,25 +3,6 @@
 uint8_t newThermoData = 1;
 uint16_t thermoData[] = {1024, 814, 2475, 2243};
 
-volatile uint16_t timer1_acc;
-uint16_t softtimer_last[SOFTTIMERNUMS];
-
-void softtimer_reset(uint8_t timernum){
-    softtimer_last[timernum] = timer1_acc;
-}
-
-uint8_t softtimer(uint8_t timernum, uint16_t interval){
-    uint16_t timer1_acc_tmp = timer1_acc;  // because of volatile
-    if((uint16_t)(timer1_acc_tmp - (uint16_t)(softtimer_last[timernum]) >= interval )){
-        softtimer_last[timernum] = timer1_acc_tmp;
-        return(1);
-    }
-    return(0);
-}
-
-// SOFTTIMER( <YOUR TIMER NUM>, <YOUR INTERVAL>);
-#define SOFTTIMER(n,a) if(softtimer((n),(a*8)))
-
 
 void hardinit() {
   /* initializes the hardware */

firmware/slavechip/main.c

@@ -5,10 +5,14 @@
 void hardinit() {
   /* initializes the hardware */
 
+  // enable softtimer isr
+  TIMSK1 |= _BV(TOIE1);
+
   sei();
 }
 
 void softinit() {
+
 }
 
 
@@ -17,6 +21,27 @@ int __attribute__((noreturn)) main(void) {
   softinit();
 
   for(;;){
+    
+    SOFTTIMER(1,500) {     
+      // do_stuff();
+    }
+
   }
 }
 
+
+
+ISR(TIMER1_OVF_vect,ISR_NOBLOCK){
+    uint16_t tmp;
+    tmp=timer1_acc;
+    tmp++;
+
+    /* the ATOMIC is acutally only needed if timer1_acc is never read from an ISR, which
+     * is probably the case.
+     * ATOMIC_FORCEON: the ISR_NOBLOCK sets sei() a few cycles before.
+     */
+    ATOMIC_BLOCK(ATOMIC_FORCEON){ 
+        timer1_acc=tmp;
+    }
+
+}

firmware/slavechip/main.h

@@ -10,5 +10,6 @@
 #include <stdio.h>
 
 #define SOFTTIMERNUMS 4
+#include "softtimer.h"
 
 #endif //__MAIN_H

firmware/slavechip/softtimer.c

@@ -0,0 +1 @@
+../shared/softtimer.c

firmware/slavechip/softtimer.h

@@ -0,0 +1 @@
+../shared/softtimer.h