Initial touchscreen support for mini2440. Based on D2 touchscreen driver

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23370 a1c6a512-1295-4272-9138-f99709370657

5 files changed, 249 insertions, 7 deletions

diff --git a/firmware/target/arm/s3c2440/mini2440/adc-target.h b/firmware/target/arm/s3c2440/mini2440/adc-target.h
index 24e878e735..5abf0d06c5 100644
--- a/firmware/target/arm/s3c2440/mini2440/adc-target.h
+++ b/firmware/target/arm/s3c2440/mini2440/adc-target.h
@@ -26,16 +26,12 @@
     Channels 4-7 are routed to LCD connector for touchscreen operation if
         supported by display panel. 
 */
-#define NUM_ADC_CHANNELS 8
+#define NUM_ADC_CHANNELS 4
 
 #define ADC_ONBOARD     0
 #define ADC_SPARE_1     1
 #define ADC_SPARE_2     2
 #define ADC_SPARE_3     3
-#define ADC_TSYM        4
-#define ADC_TSYP        5
-#define ADC_TSXM        6
-#define ADC_TSXP        7
 
 #define ADC_READ_ERROR 0xFFFF
 
diff --git a/firmware/target/arm/s3c2440/mini2440/button-mini2440.c b/firmware/target/arm/s3c2440/mini2440/button-mini2440.c
index 787c04d1ef..0435f47559 100644
--- a/firmware/target/arm/s3c2440/mini2440/button-mini2440.c
+++ b/firmware/target/arm/s3c2440/mini2440/button-mini2440.c
@@ -24,6 +24,7 @@
 #include "system.h"
 #include "button.h"
 #include "kernel.h"
+#include "touchscreen-target.h"
 
 void button_init_device(void)
 {
@@ -50,6 +51,8 @@ void button_init_device(void)
     S3C2440_GPIO_PULLUP (GPGUP, 9, GPIO_PULLUP_ENABLE);
     S3C2440_GPIO_PULLUP (GPGUP, 10, GPIO_PULLUP_ENABLE);
     
+    /* init touchscreen */
+    touchscreen_init_device();
 }
 
 inline bool button_hold(void)
@@ -57,12 +60,18 @@ inline bool button_hold(void)
     return 0;
 }
 
-int button_read_device(void)
+int button_read_device(int* data)
 {
     int btn = BUTTON_NONE;
+    static int old_data = 0;
+
+   *data = old_data;
 
     /* Read the buttons - active low */
     btn = (GPGDAT & BUTTON_MAIN) ^ BUTTON_MAIN;
+
+    /* read touchscreen */ 
+    btn |= touchscreen_read_device(data, &old_data);
     
     return btn;
 }
diff --git a/firmware/target/arm/s3c2440/mini2440/button-target.h b/firmware/target/arm/s3c2440/mini2440/button-target.h
index 4a84014462..66419b464a 100644
--- a/firmware/target/arm/s3c2440/mini2440/button-target.h
+++ b/firmware/target/arm/s3c2440/mini2440/button-target.h
@@ -27,7 +27,7 @@
 
 bool button_hold(void);
 void button_init_device(void);
-int button_read_device(void);
+int button_read_device(int*);
 void touchpad_set_sensitivity(int level);
 
 /* Mini2440 specific button codes */
@@ -43,6 +43,20 @@ void touchpad_set_sensitivity(int level);
 #define BUTTON_SEVEN        0x0200
 #define BUTTON_EIGHT        0x0400
 
+/* Touch Screen Area Buttons */
+#define BUTTON_TOPLEFT      0x010000
+#define BUTTON_TOPMIDDLE    0x020000
+#define BUTTON_TOPRIGHT     0x040000
+#define BUTTON_MIDLEFT      0x080000
+#define BUTTON_CENTER       0x100000
+#define BUTTON_MIDRIGHT     0x200000
+#define BUTTON_BOTTOMLEFT   0x400000
+#define BUTTON_BOTTOMMIDDLE 0x800000
+#define BUTTON_BOTTOMRIGHT  0x100000
+
+#define BUTTON_TOUCH        0x200000
+
+
 #define BUTTON_MENU         BUTTON_ONE         
 #define BUTTON_UP           BUTTON_TWO
 #define BUTTON_SELECT       BUTTON_THREE
diff --git a/firmware/target/arm/s3c2440/mini2440/touchscreen-mini2440.c b/firmware/target/arm/s3c2440/mini2440/touchscreen-mini2440.c
new file mode 100644
index 0000000000..ce7c8d5dd7
--- /dev/null
+++ b/firmware/target/arm/s3c2440/mini2440/touchscreen-mini2440.c
@@ -0,0 +1,190 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___void 
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 by Rob Purchase
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "touchscreen-target.h"
+#include "adc-target.h"
+#include "system.h"
+#include "stdlib.h"
+#include "button.h"
+#include "touchscreen.h"
+
+#define NO_OF_TOUCH_DATA 5
+
+struct touch_calibration_point {
+    short px_x; /* known pixel value */
+    short px_y;
+    short val_x; /* touchscreen value at the known pixel */
+    short val_y;
+};
+
+static struct touch_calibration_point topleft, bottomright;
+
+static bool touch_available = false;
+
+static short x[NO_OF_TOUCH_DATA], y[NO_OF_TOUCH_DATA];
+
+/* comparator for qsort */
+static int short_cmp(const void *a, const void *b)
+{
+    return *(short*)a - *(short*)b;
+}
+
+static int touch_to_pixels(short val_x, short val_y)
+{
+    short x,y;
+
+    x=val_x;
+    y=val_y;
+
+    x = (x-topleft.val_x)*(bottomright.px_x - topleft.px_x)
+            / (bottomright.val_x - topleft.val_x) + topleft.px_x;
+
+    y = (y-topleft.val_y)*(bottomright.px_y - topleft.px_y)
+            / (bottomright.val_y - topleft.val_y) + topleft.px_y;
+
+    if (x < 0)
+        x = 0;
+    else if (x>=LCD_WIDTH)
+        x=LCD_WIDTH-1;
+
+    if (y < 0)
+        y = 0;
+    else if (y>=LCD_HEIGHT)
+        y=LCD_HEIGHT-1;
+
+    return (x<<16)|y;
+}
+
+void touchscreen_init_device()
+{
+    /* set touchscreen adc controller into wait for interrupt mode */
+    ADCTSC = 0xd3; /* Wfait,XP-PU,XP_DIS,XM_DIS,YP_dis,YM_end */
+
+    /* Arbitrary touchscreen calibration */
+    topleft.px_x = 0;
+    topleft.px_y = 0;
+    topleft.val_x = 105;
+    topleft.val_y = 925;
+
+    bottomright.px_x = LCD_WIDTH;
+    bottomright.px_y = LCD_HEIGHT;
+    bottomright.val_x = 890;
+    bottomright.val_y = 105;
+
+    touch_available = false;
+}
+
+void touchscreen_scan_device()
+{
+    static long last_touch_read = 0;
+    static int touch_data_index = 0;
+
+   int saveADCDLY;
+ 
+    /* check touch state */ 
+    if(ADCDAT1 & (1<<15))    
+    {
+        return;
+    }
+
+    if (TIME_AFTER(current_tick, last_touch_read + 1))
+    {
+        /* resets the index if the last touch could not be read 5 times */
+        touch_data_index = 0;
+    }
+    
+    /* read touch data */    
+    saveADCDLY = ADCDLY;
+    ADCDLY = 40000; /*delay ~0.8ms (1/50M)*4000 */ 
+    ADCTSC = (1<<3)|(1<<2); /* pullup disable, seq x,y pos measure */
+    /* start adc */
+    ADCCON|= 0x1; 
+    /* wait for start and end */
+    while(ADCCON & 0x1);
+    while(!(ADCCON & 0x8000));
+
+    x[touch_data_index] = ADCDAT0&0x3ff;
+    y[touch_data_index] = ADCDAT1&0x3ff;
+   
+    ADCTSC = 0xd3; /* back to interrupt mode */
+    ADCDLY = saveADCDLY;
+    
+    touch_data_index++;
+
+    if (touch_data_index > NO_OF_TOUCH_DATA - 1)
+    {
+        /* coordinates 5 times read */
+        touch_available = true;
+        touch_data_index = 0;
+    }
+    last_touch_read = current_tick;
+}
+
+int touchscreen_read_device(int *data, int *old_data)
+{
+    int btn = BUTTON_NONE;
+    static bool touch_hold = false;
+    static long last_touch = 0;
+
+    if (touch_available || touch_hold)
+    {
+        short x_touch, y_touch;
+        static short last_x = 0, last_y = 0;
+
+        if (touch_hold)
+        {
+            /* get rid of very fast unintended double touches */
+            x_touch = last_x;
+            y_touch = last_y;
+        }
+        else
+        {
+            /* sort the 5 data taken and use the median value */
+            qsort(x, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
+            qsort(y, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
+            
+            x_touch = last_x = x[(NO_OF_TOUCH_DATA - 1)/2];
+            y_touch = last_y = y[(NO_OF_TOUCH_DATA - 1)/2];
+            
+            last_touch = current_tick;
+            
+            touch_hold = true;
+            touch_available = false;
+        }
+        
+        *old_data = *data = touch_to_pixels(x_touch, y_touch);
+        
+        btn |= touchscreen_to_pixels((*data&0xffff0000) >> 16,
+                                     (*data&0x0000ffff),
+                                     data);
+    }
+
+    if (TIME_AFTER(current_tick, last_touch + 10))
+    {
+        /* put the touchscreen back into interrupt mode */
+        touch_hold = false;
+    }
+    
+    return btn;
+}
+
+
diff --git a/firmware/target/arm/s3c2440/mini2440/touchscreen-target.h b/firmware/target/arm/s3c2440/mini2440/touchscreen-target.h
new file mode 100644
index 0000000000..1019a98330
--- /dev/null
+++ b/firmware/target/arm/s3c2440/mini2440/touchscreen-target.h
@@ -0,0 +1,33 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 by Dominik Wenger
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _TOUCHSCREEN_TARGET_H
+#define _TOUCHSCREEN_TARGET_H
+
+/* try to get a touchscreen reading from adc */
+void touchscreen_scan_device(void);
+/* init touchscreen driver */
+void touchscreen_init_device(void);
+
+int touchscreen_read_device(int *data, int *old_data);
+
+#endif
+