refactored how interrupts work...

  set a flag and return immediately,
  then handle the actual logic later during a less-critical code path
Enables smarter responses to standby wakeups.
Seems to fix missed button presses during standby,
  and most of the too-fast sleep ticks.
Also eliminated waits from button state measurement, so it can happen easier during standby.
  (also eliminates the chance of an infinite loop on extra-noisy hardware)
Also might improve timing-sensitive interrupts like attiny85 PWM channel 4,
  or a PWM-DSM hybrid technique I'd like to try.

BUT this change also appears to break the thermal sensor, so that needs to be fixed.

1 files changed, 21 insertions, 0 deletions

diff --git a/spaghetti-monster/fsm-main.c b/spaghetti-monster/fsm-main.c
index e537a9e..a898f41 100644
--- a/spaghetti-monster/fsm-main.c
+++ b/spaghetti-monster/fsm-main.c
@@ -160,6 +160,9 @@ int main() {
             standby_mode();
         }
 
+        // catch up on interrupts
+        handle_deferred_interrupts();
+
         // give the recipe some time slices
         loop();
 
@@ -168,4 +171,22 @@ int main() {
     }
 }
 
+
+void handle_deferred_interrupts() {
+    /*
+    if (irq_pcint) {  // button pressed or released
+        // nothing to do here
+        // (PCINT only matters during standby)
+    }
+    */
+    if (irq_adc) {  // ADC done measuring
+        ADC_inner();
+        // irq_adc = 0;  // takes care of itself
+    }
+    if (irq_wdt) {  // the clock ticked
+        WDT_inner();
+        // irq_wdt = 0;  // takes care of itself
+    }
+}
+
 #endif