From e108964ec08f70a46e1db430288283d68a906c56 Mon Sep 17 00:00:00 2001
From: Jonathan Gordon <rockbox@jdgordon.info>
Date: Sun, 30 Sep 2007 11:15:14 +0000
Subject: IRQ driven touchpad driver, crude but working

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14914 a1c6a512-1295-4272-9138-f99709370657
---
 bootloader/mrobe500.c                              | 37 ++++++++++----------
 firmware/export/button.h                           |  5 +--
 .../arm/tms320dm320/mrobe-500/button-mr500.c       | 39 +++++++++++++++++++++-
 3 files changed, 61 insertions(+), 20 deletions(-)

diff --git a/bootloader/mrobe500.c b/bootloader/mrobe500.c
index ce1aa57..b92096a 100755
--- a/bootloader/mrobe500.c
+++ b/bootloader/mrobe500.c
@@ -104,8 +104,6 @@ void main(void)
     while(true)
     {
         button = button_read_device();
-        if (button)
-            printf("btn: %x", button);
         if (button == BUTTON_POWER)
         {
             printf("reset");
@@ -119,23 +117,28 @@ void main(void)
             address+=0x1000;
         else if (button==BUTTON_RC_REW)
             address-=0x1000;
-
-   //     if ((IO_GIO_BITSET0&(1<<14) == 0)
+        if (button&BUTTON_TOUCHPAD)
         {
-            short x,y,z1,z2, reg;
-            extern int uart1count;
-            tsc2100_read_values(&x, &y, &z1, &z2);
-            printf("x: %04x y: %04x z1: %04x z2: %04x", x, y, z1, z2);
-            printf("tsadc: %4x", tsc2100_readreg(TSADC_PAGE, TSADC_ADDRESS)&0xffff);
-            printf("current tick: %04x", current_tick);
-            printf("Address: 0x%08x Data: 0x%08x", address, *address);
-            printf("Address: 0x%08x Data: 0x%08x", address+1, *(address+1));
-            printf("Address: 0x%08x Data: 0x%08x", address+2, *(address+2));
-            printf("uart1count: %d", uart1count);
-            printf("%x %x", IO_UART1_RFCR & 0x3f, IO_UART1_DTRR & 0xff);
-            tsc2100_keyclick(); /* doesnt work :( */
-            line -= 8;
+            int touch = button_get_last_touch();
+            printf("x: %d, y: %d", (touch>>16), touch&0xffff);
+            line--;
         }
+//         if ((IO_GIO_BITSET0&(1<<14) == 0)
+//         {
+//             short x,y,z1,z2, reg;
+//             extern int uart1count;
+//             tsc2100_read_values(&x, &y, &z1, &z2);
+//             printf("x: %04x y: %04x z1: %04x z2: %04x", x, y, z1, z2);
+//             printf("tsadc: %4x", tsc2100_readreg(TSADC_PAGE, TSADC_ADDRESS)&0xffff);
+//             printf("current tick: %04x", current_tick);
+//             printf("Address: 0x%08x Data: 0x%08x", address, *address);
+//             printf("Address: 0x%08x Data: 0x%08x", address+1, *(address+1));
+//             printf("Address: 0x%08x Data: 0x%08x", address+2, *(address+2));
+//             printf("uart1count: %d", uart1count);
+//             printf("%x %x", IO_UART1_RFCR & 0x3f, IO_UART1_DTRR & 0xff);
+//             tsc2100_keyclick(); /* doesnt work :( */
+//             line -= 8;
+//         }
     }
 #endif
     printf("ATA");
diff --git a/firmware/export/button.h b/firmware/export/button.h
index 8b8c966..5322d81 100644
--- a/firmware/export/button.h
+++ b/firmware/export/button.h
@@ -57,7 +57,8 @@ int button_apply_acceleration(unsigned int data, unsigned int factor);
 #define BUTTON_NONE    0x00000000
 
 /* Button modifiers */
-#define BUTTON_REL     0x02000000
-#define BUTTON_REPEAT  0x04000000
+#define BUTTON_REL      0x02000000
+#define BUTTON_REPEAT   0x04000000
+#define BUTTON_TOUCHPAD 0x08000000
 
 #endif /* _BUTTON_H_ */
diff --git a/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c b/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
index 1d0d271..b57680a 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);
+}
-- 
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