Merge pull request #521 from pimoroni/patch-input-bounce

Fix input debounce/update rate

32blit/engine/engine.cpp

@@ -64,6 +64,7 @@ namespace blit {
   uint32_t pending_render_time = 0;
 
   uint32_t last_tick_time = 0;
+  uint32_t last_state = 0;
 
   bool tick(uint32_t time) {
     if (last_tick_time == 0) {
@@ -77,10 +78,15 @@ namespace blit {
     // catch up on updates if any pending
     pending_update_time += (time - last_tick_time);
     while (pending_update_time >= update_rate_ms) {
+      // button state changes
+      uint32_t changed = api.buttons.state ^ last_state;
+
+      api.buttons.pressed = changed & api.buttons.state;
+      api.buttons.released = changed & last_state;
+      last_state = api.buttons.state;
+
       update(time - pending_update_time); // create fake timestamp that would have been accurate for the update event
       pending_update_time -= update_rate_ms;
-
-      api.buttons.pressed = api.buttons.released = 0;
     }
 
     last_tick_time = time;

32blit/engine/input.hpp

@@ -21,11 +21,6 @@ namespace blit {
 
   struct ButtonState {
     ButtonState &operator=(uint32_t v) {
-      uint32_t changed = state ^ v;
-
-      pressed |= changed & v;
-      released |= changed & state;
-
       state = v;
 
       return *this;