added support for 3D touchpads

drivers/ads7843_lld.c

@@ -36,4 +36,8 @@ __inline uint16_t lld_readY(void) {
     return y;
 }
 
+__inline uint16_t lld_readZ(void) {
+	return 0;
+}
+
 #endif

drivers/ads7843_lld.h

@@ -8,6 +8,7 @@
 
 uint16_t lld_readX(void);
 uint16_t lld_readY(void);
+uint16_t lld_readZ(void);
 
 #endif
 #endif

glcdconf.h

@@ -8,7 +8,7 @@
 
 
 /***** TOUCHPAD CONTROLLER *****/
-#define TOUCHPAD_USE_ADS7843
-
+//#define TOUCHPAD_USE_ADS7843
+#define TOUCHPAD_USE_XPT2046
 
 #endif

lcd.mk

@@ -6,7 +6,8 @@ LCDSRC = 	${CHIBIOS}/ext/lcd/glcd.c \
 			${CHIBIOS}/ext/lcd/gui.c \
 			${CHIBIOS}/ext/lcd/drivers/ssd1289_lld.c \
 			${CHIBIOS}/ext/lcd/drivers/s6d1121_lld.c \
-			${CHIBIOS}/ext/lcd/drivers/ads7843_lld.c
+			${CHIBIOS}/ext/lcd/drivers/ads7843_lld.c \
+			${CHIBIOS}/ext/lcd/drivers/xpt2046_lld.c \
 
 LCDINC = 	${CHIBIOS}/ext/lcd \
 			${CHIBIOS}/etc/lcd/drivers

touchpad.c

@@ -96,6 +96,10 @@ uint16_t tpReadY(void) {
 	return y;
 }
 
+uint16_t tpReadZ(void) {
+	return lld_readZ();
+}
+
 static void tpDrawCross(uint16_t x, uint16_t y) {
 	lcdDrawLine(x-15, y, x-2, y, 0xffff);
 	lcdDrawLine(x+2, y, x+15, y, 0xffff);

touchpad.h

@@ -53,6 +53,17 @@ uint16_t tpReadX(void);
  */
 uint16_t tpReadY(void);
 
+/*
+ * Description: reads-out Z value / pressure
+ *				only available when controller supports, returns
+ *				zero otherwise.
+ *
+ * param:		none
+ *
+ * return:		pressure on the touchpad
+ */
+uint16_t tpReadZ(void);
+
 /*
  * Description: calibration routine
  *