merged irq-refactor branch, which fixes some small but long-standing issues:

- fixed occasional short/aborted frames in aux LED sleep animation
- fixed rare case of bogus voltage and/or temperature values
- fixed issue where nice_delay_ms() didn't work in setup()
- fixed theoretical possibility of extra-noisy buttons causing a hang
- fixed reboot loop which happened after any crashes
- fixed issue where button press in sleep mode could occasionally crash
  (but the issue may have been created by this branch before being fixed by it)
- reduced occasional missed button events while asleep
  (still seems to happen but not nearly as much)

Also does some other things:
- cleans up the ADC code significantly
- cleans up the WDT code
- adds a voltage stabilizer/lowpass option (enabled on t1634 builds)
- greatly reduces time spent per interrupt,
  which might make a future PWM-DSM technique possible
- moves most interrupt-handling logic to a non-critical code path,
  deferring that code until timing doesn't matter as much
- sped up button state measurements
- very slightly reduces power used in sleep mode

1 files changed, 9 insertions, 6 deletions

diff --git a/spaghetti-monster/fsm-events.c b/spaghetti-monster/fsm-events.c
index 3e9a12d..a1b013a 100644
--- a/spaghetti-monster/fsm-events.c
+++ b/spaghetti-monster/fsm-events.c
@@ -110,7 +110,7 @@ uint8_t nice_delay_ms(uint16_t ms) {
     /*  // delay_zero() implementation
     if (ms == 0) {
         CLKPR = 1<<CLKPCE; CLKPR = 0;  // full speed
-        _delay_loop_2(BOGOMIPS*98/100/3);
+        _delay_loop_2(BOGOMIPS*95/100/3);
         return 1;
     }
     */
@@ -120,15 +120,15 @@ uint8_t nice_delay_ms(uint16_t ms) {
         uint8_t level = actual_level;  // volatile, avoid repeat access
         if (level < QUARTERSPEED_LEVEL) {
             clock_prescale_set(clock_div_4);
-            _delay_loop_2(BOGOMIPS*98/100/4);
+            _delay_loop_2(BOGOMIPS*95/100/4);
         }
         //else if (level < HALFSPEED_LEVEL) {
         //    clock_prescale_set(clock_div_2);
-        //    _delay_loop_2(BOGOMIPS*98/100/2);
+        //    _delay_loop_2(BOGOMIPS*95/100/2);
         //}
         else {
             clock_prescale_set(clock_div_1);
-            _delay_loop_2(BOGOMIPS*98/100);
+            _delay_loop_2(BOGOMIPS*95/100);
         }
         // restore regular clock speed
         clock_prescale_set(clock_div_1);
@@ -136,15 +136,18 @@ uint8_t nice_delay_ms(uint16_t ms) {
         // underclock MCU to save power
         clock_prescale_set(clock_div_4);
         // wait
-        _delay_loop_2(BOGOMIPS*98/100/4);
+        _delay_loop_2(BOGOMIPS*95/100/4);
         // restore regular clock speed
         clock_prescale_set(clock_div_1);
         #endif  // ifdef USE_RAMPING
         #else
         // wait
-        _delay_loop_2(BOGOMIPS*98/100);
+        _delay_loop_2(BOGOMIPS*95/100);
         #endif  // ifdef USE_DYNAMIC_UNDERCLOCKING
 
+        // run pending system processes while we wait
+        handle_deferred_interrupts();
+
         if ((nice_delay_interrupt) || (old_state != current_state)) {
             return 0;  // state changed; abort
         }