client: debounce

[tattlekey] / client / tattlekey.c

diff --git a/client/tattlekey.c b/client/tattlekey.c
index 45059f6ed2e832b8457c64f4696640d0a6c44e1a..ff61f430bb2b978a298bfa31238f3ffe22fd5850 100644 (file)
--- a/client/tattlekey.c
+++ b/client/tattlekey.c
@@ -11,10 +11,16 @@ queue_t queue;
 
 static void button_pressed() {
   /* This runs in interrupt context; don't linger.  */
-  char zero = '\0';
-  /* We don't check for failure (full queue) here because there's not much to be
-   * done about it. */
-  queue_try_add(&queue, &zero);
+  static uint64_t last_button_press_time = 0;
+  uint64_t now = time_us_64();
+  uint64_t time_since_last_press = now - last_button_press_time;
+  if (time_since_last_press > minimum_microseconds_between_button_presses) {
+    last_button_press_time = now;
+    char zero = '\0';
+    /* We don't check for failure (full queue) here because there's not much to
+     * be done about it. */
+    queue_try_add(&queue, &zero);
+  }
 }
 
 int main() {