keep detected stuck notes

CHANGELOG.md

@@ -6,6 +6,10 @@
 - Transpose reset with settings+up+down buttons
 - Irregular tuning support, JI 7-limit on settings + A#3
 
+### Changed
+- Keep stuck notes forever. They were allowed to come back, which they often did.
+  This is now changed, so if a note is detected as stuck it doesn't come back (e.g. when a key is held down during start up)
+
 ### Fixed
 - Correctly lower message frequency when multiple keys are pressed (was too low in some cases)
 

button_read.c

@@ -663,7 +663,11 @@ void update_button(button_t* but) {
       but->zero_time++;
       if (but->zero_time > ZERO_LEVEL_TIME) {
         but->zero_time = 0;
+#ifdef DETECT_STUCK_NOTES_DECREASE
         but->zero_offset = but->zero_max * ZERO_LEVEL_FACT;
+#else
+        but->zero_offset = max(but->zero_offset, but->zero_max * ZERO_LEVEL_FACT);
+#endif
       }
     } else {
       but->zero_time = 0;
@@ -753,7 +757,7 @@ void update_button(button_t* but) {
     but->zero_time = 0;
   } else {
     but->p = 0;
-#ifdef DETECT_STUCK_NOTES
+#ifdef DETECT_STUCK_NOTES_DECREASE
     but->zero_time++;
     if (but->zero_time == ZERO_LEVEL_TIME) {
       but->zero_offset = 0;

config.h

@@ -52,6 +52,7 @@
 
 // #define CALIBRATION_MODE TRUE      // don't linearize or calibrate sensor data
 #define DETECT_STUCK_NOTES         // zero level detection
+// #define DETECT_STUCK_NOTES_DECREASE  // zero level detection, allow notes to come back
 // #define BREAKPOINT_CALIBRATION     // button sensitivity correction using a breakpoint fit
 
 #define CALIB_FORCE  ((1<<18)/64 + 1)   // +1 to signify hardware revision, 1k adc pull up resistors