Merge pull request #9819 from dhalbert/keys-generic-reset-fix

Fix regression of keypad.*.reset() behavior: send key_pressed events

shared-bindings/keypad/KeyMatrix.c

@@ -159,6 +159,9 @@ static void check_for_deinit(keypad_keymatrix_obj_t *self) {
 //|         """Reset the internal state of the scanner to assume that all keys are now released.
 //|         Any key that is already pressed at the time of this call will therefore immediately cause
 //|         a new key-pressed event to occur.
+//|         For instance, if you call `reset()` immediately after creating a `KeyMatrix` object
+//|         at the beginning of your program, the events it generates will let you determine which keys
+//|         were being held down at program start.
 //|         """
 //|         ...
 

shared-bindings/keypad/Keys.c

@@ -147,6 +147,9 @@ static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(keypad_keys___exit___obj, 4, 4, keypa
 //|         """Reset the internal state of the scanner to assume that all keys are now released.
 //|         Any key that is already pressed at the time of this call will therefore immediately cause
 //|         a new key-pressed event to occur.
+//|         For instance, if you call `reset()` immediately after creating a `Keys` object
+//|         at the beginning of your program, the events it generates will let you determine which keys
+//|         were being held down at program start.
 //|         """
 //|         ...
 

shared-bindings/keypad/ShiftRegisterKeys.c

@@ -201,6 +201,9 @@ static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(keypad_shiftregisterkeys___exit___obj
 //|         """Reset the internal state of the scanner to assume that all keys are now released.
 //|         Any key that is already pressed at the time of this call will therefore immediately cause
 //|         a new key-pressed event to occur.
+//|         For instance, if you call `reset()` immediately after creating a `ShiftRegisterKeys` object
+//|         at the beginning of your program, the events it generates will let you determine which keys
+//|         were being held down at program start.
 //|         """
 //|         ...
 

shared-bindings/keypad_demux/DemuxKeyMatrix.c

@@ -147,6 +147,9 @@ static void check_for_deinit(keypad_demux_demuxkeymatrix_obj_t *self) {
 //|         """Reset the internal state of the scanner to assume that all keys are now released.
 //|         Any key that is already pressed at the time of this call will therefore immediately cause
 //|         a new key-pressed event to occur.
+//|         For instance, if you call `reset()` immediately after creating a `DemuxKeyMatrix` object
+//|         at the beginning of your program, the events it generates will let you determine which keys
+//|         were being held down at program start.
 //|         """
 //|         ...
 

shared-module/keypad/__init__.c

@@ -140,7 +140,7 @@ void keypad_never_reset(keypad_scanner_obj_t *self) {
 void common_hal_keypad_generic_reset(void *self_in) {
     keypad_scanner_obj_t *self = self_in;
     size_t key_count = common_hal_keypad_generic_get_key_count(self);
-    memset(self->debounce_counter, self->debounce_threshold, key_count);
+    memset(self->debounce_counter, -self->debounce_threshold, key_count);
     keypad_scan_now(self, port_get_raw_ticks(NULL));
 }