-static uint16_t button_start[N_BUTTONS];
-static unsigned char prev_pin;
-
-static unsigned char user_params[MAX_USER_PARAMS] = { 0, 0, 0 };
-static unsigned char user_params_max[MAX_USER_PARAMS] = { 3, 2, 2 };
+#define WAKEUP_LIMIT 5 // times 100 ms
+#define SHORT_PRESS_MIN 2 // in jiffies (16 Hz ticks)
+#define SHORT_PRESS_MAX 5
+#define LONG_PRESS_MIN 10
+#define SETUP_TIMEOUT 255 // 15 seconds in jiffies
+// #define USER_PARAMS_WRAPPING 1
+
+static uint16_t button_start[3];
+union {
+ unsigned char all;
+ struct {
+ unsigned char btn1 : 1;
+ unsigned char btn2 : 1;
+ unsigned char brake : 1;
+ unsigned char brake_working : 1;
+ unsigned char brake_reported : 1;
+ };
+} button_state, prev_state;
+
+/*
+ * How does the user_params setup mode work:
+ *
+ * There is an array of user-settable parameters user_params[N_USER_PARAMS],
+ * each of which has its own maximum value (user_params_max[N_USER_PARAMS].
+ * These parameters can be modified in the following way:
+ *
+ * Long press of button 1 enters the setup mode.
+ * In the setup mode, status and illumination LEDs both blink in inversion
+ * number mode.
+ * The # of blinks of the illumination LED shows which user_param is
+ * being modified now,
+ * and the # of blinks of the status LED shows the value of this particular
+ * user_param.
+ *
+ * Long press of button 1 selects the next user_param,
+ * short press of button 0 decrements this particular user_param value,
+ * short press of button 1 increments this particular user_param value.
+ *
+ * If USER_PARAMS_WRAPPING is #defined, decrementing the zero leads to
+ * the maximum value - 1, and incrementing the maximum value - 1 leads
+ * to zero.
+ *
+ * After the SETUP_TIMEOUT with no button press, the system leaves the setup
+ * mode.
+ */
+static unsigned char user_params[N_USER_PARAMS] = { 0, 0, 0 };
+static unsigned char user_params_max[N_USER_PARAMS] = {
+ N_AMBIENT_ZONES+1, 2, 2
+};