touchscreen: change odd sentinel value for time of last touch

Using tick 0xffff does not make any sense, use -1 instead.

Change-Id: Id574eb35418c6713c4fc91ed539aadc42fd29aa5

1 files changed, 3 insertions, 3 deletions

diff --git a/firmware/drivers/button.c b/firmware/drivers/button.c
index 0af51dc3b2..9979bc0155 100644
--- a/firmware/drivers/button.c
+++ b/firmware/drivers/button.c
@@ -94,7 +94,7 @@ static int button_read(void);
 #endif
 
 #ifdef HAVE_TOUCHSCREEN
-static int last_touchscreen_touch;
+static long last_touchscreen_touch;
 #endif
 #if defined(HAVE_HEADPHONE_DETECTION)
 static struct timeout hp_detect_timeout; /* Debouncer for headphone plug/unplug */
@@ -542,7 +542,7 @@ void button_init(void)
 #endif
 #endif
 #ifdef HAVE_TOUCHSCREEN
-    last_touchscreen_touch = 0xffff;
+    last_touchscreen_touch = -1;
 #endif
     /* Start polling last */
     tick_add_task(button_tick);
@@ -714,7 +714,7 @@ void button_clear_queue(void)
 }
 
 #ifdef HAVE_TOUCHSCREEN
-int touchscreen_last_touch(void)
+long touchscreen_last_touch(void)
 {
     return last_touchscreen_touch;
 }