IRQ driven touchpad driver, crude but working

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14914 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 38 insertions, 1 deletions

diff --git a/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c b/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
index 1d0d2714a8..b57680afb4 100644
--- a/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
+++ b/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
@@ -17,6 +17,8 @@
  *
  ****************************************************************************/
 
+/* this file also handles the touch screen driver interface */
+
 #include "config.h"
 #include "cpu.h"
 #include "system.h"
@@ -27,23 +29,47 @@
 #include "system.h"
 #include "backlight-target.h"
 #include "uart-target.h"
+#include "tsc2100.h"
 
 #define BUTTON_TIMEOUT 50
 
 #define BUTTON_START_BYTE 0xF0
 #define BUTTON_START_BYTE2 0xF4 /* not sure why, but sometimes you get F0 or F4, */
                                 /* but always the same one for the session? */
-
+static short last_x, last_y, last_z1, last_z2; /* for the touch screen */
+static int last_touch;
 void button_init_device(void)
 {
+    last_touch = 0;
     /* GIO is the power button, set as input */
     IO_GIO_DIR0 |= 0x01;
+    
+    
+    /* Enable the touchscreen interrupt */
+    IO_INTC_EINT2 |= (1<<3); /* IRQ_GIO14 */
+#if 0
+    tsc2100_writereg(TSADC_PAGE, TSADC_ADDRESS, 
+                     TSADC_PSTCM|
+                     (0x2<<TSADC_ADSCM_SHIFT)| /* scan x,y,z1,z2 */
+                     (0x1<<TSADC_RESOL_SHIFT) /* 8 bit resolution */
+                     );
+    /* doesnt work for some reason... 
+        setting to 8bit would probably be better than the 12bit currently */
+#endif
 }
 
 inline bool button_hold(void)
 {
     return false;
 }
+#ifdef BOOTLOADER
+int button_get_last_touch(void)
+{
+    int ret_val = last_touch;
+    last_touch = 0;
+    return ret_val;
+}
+#endif
 
 int button_read_device(void)
 {
@@ -51,6 +77,9 @@ int button_read_device(void)
     int i = 0;
     int btn = BUTTON_NONE;
     
+    if (last_touch)
+        btn |= BUTTON_TOUCHPAD;
+    
     if ((IO_GIO_BITSET0&0x01) == 0)
         btn |= BUTTON_POWER;
         
@@ -94,3 +123,11 @@ int button_read_device(void)
     }
     return btn;
 }
+
+void GIO14(void)
+{
+    tsc2100_read_values(&last_x,  &last_y,
+                        &last_z1, &last_z2);
+    last_touch = (last_x<<16)|last_y;
+    IO_INTC_IRQ2 = (1<<3);
+}