diff options
Diffstat (limited to 'firmware/target/arm/s3c2440/mini2440/touchscreen-mini2440.c')
-rw-r--r-- | firmware/target/arm/s3c2440/mini2440/touchscreen-mini2440.c | 190 |
1 files changed, 190 insertions, 0 deletions
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 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___void | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2008 by Rob Purchase | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "config.h" | ||
23 | #include "touchscreen-target.h" | ||
24 | #include "adc-target.h" | ||
25 | #include "system.h" | ||
26 | #include "stdlib.h" | ||
27 | #include "button.h" | ||
28 | #include "touchscreen.h" | ||
29 | |||
30 | #define NO_OF_TOUCH_DATA 5 | ||
31 | |||
32 | struct touch_calibration_point { | ||
33 | short px_x; /* known pixel value */ | ||
34 | short px_y; | ||
35 | short val_x; /* touchscreen value at the known pixel */ | ||
36 | short val_y; | ||
37 | }; | ||
38 | |||
39 | static struct touch_calibration_point topleft, bottomright; | ||
40 | |||
41 | static bool touch_available = false; | ||
42 | |||
43 | static short x[NO_OF_TOUCH_DATA], y[NO_OF_TOUCH_DATA]; | ||
44 | |||
45 | /* comparator for qsort */ | ||
46 | static int short_cmp(const void *a, const void *b) | ||
47 | { | ||
48 | return *(short*)a - *(short*)b; | ||
49 | } | ||
50 | |||
51 | static int touch_to_pixels(short val_x, short val_y) | ||
52 | { | ||
53 | short x,y; | ||
54 | |||
55 | x=val_x; | ||
56 | y=val_y; | ||
57 | |||
58 | x = (x-topleft.val_x)*(bottomright.px_x - topleft.px_x) | ||
59 | / (bottomright.val_x - topleft.val_x) + topleft.px_x; | ||
60 | |||
61 | y = (y-topleft.val_y)*(bottomright.px_y - topleft.px_y) | ||
62 | / (bottomright.val_y - topleft.val_y) + topleft.px_y; | ||
63 | |||
64 | if (x < 0) | ||
65 | x = 0; | ||
66 | else if (x>=LCD_WIDTH) | ||
67 | x=LCD_WIDTH-1; | ||
68 | |||
69 | if (y < 0) | ||
70 | y = 0; | ||
71 | else if (y>=LCD_HEIGHT) | ||
72 | y=LCD_HEIGHT-1; | ||
73 | |||
74 | return (x<<16)|y; | ||
75 | } | ||
76 | |||
77 | void touchscreen_init_device() | ||
78 | { | ||
79 | /* set touchscreen adc controller into wait for interrupt mode */ | ||
80 | ADCTSC = 0xd3; /* Wfait,XP-PU,XP_DIS,XM_DIS,YP_dis,YM_end */ | ||
81 | |||
82 | /* Arbitrary touchscreen calibration */ | ||
83 | topleft.px_x = 0; | ||
84 | topleft.px_y = 0; | ||
85 | topleft.val_x = 105; | ||
86 | topleft.val_y = 925; | ||
87 | |||
88 | bottomright.px_x = LCD_WIDTH; | ||
89 | bottomright.px_y = LCD_HEIGHT; | ||
90 | bottomright.val_x = 890; | ||
91 | bottomright.val_y = 105; | ||
92 | |||
93 | touch_available = false; | ||
94 | } | ||
95 | |||
96 | void touchscreen_scan_device() | ||
97 | { | ||
98 | static long last_touch_read = 0; | ||
99 | static int touch_data_index = 0; | ||
100 | |||
101 | int saveADCDLY; | ||
102 | |||
103 | /* check touch state */ | ||
104 | if(ADCDAT1 & (1<<15)) | ||
105 | { | ||
106 | return; | ||
107 | } | ||
108 | |||
109 | if (TIME_AFTER(current_tick, last_touch_read + 1)) | ||
110 | { | ||
111 | /* resets the index if the last touch could not be read 5 times */ | ||
112 | touch_data_index = 0; | ||
113 | } | ||
114 | |||
115 | /* read touch data */ | ||
116 | saveADCDLY = ADCDLY; | ||
117 | ADCDLY = 40000; /*delay ~0.8ms (1/50M)*4000 */ | ||
118 | ADCTSC = (1<<3)|(1<<2); /* pullup disable, seq x,y pos measure */ | ||
119 | /* start adc */ | ||
120 | ADCCON|= 0x1; | ||
121 | /* wait for start and end */ | ||
122 | while(ADCCON & 0x1); | ||
123 | while(!(ADCCON & 0x8000)); | ||
124 | |||
125 | x[touch_data_index] = ADCDAT0&0x3ff; | ||
126 | y[touch_data_index] = ADCDAT1&0x3ff; | ||
127 | |||
128 | ADCTSC = 0xd3; /* back to interrupt mode */ | ||
129 | ADCDLY = saveADCDLY; | ||
130 | |||
131 | touch_data_index++; | ||
132 | |||
133 | if (touch_data_index > NO_OF_TOUCH_DATA - 1) | ||
134 | { | ||
135 | /* coordinates 5 times read */ | ||
136 | touch_available = true; | ||
137 | touch_data_index = 0; | ||
138 | } | ||
139 | last_touch_read = current_tick; | ||
140 | } | ||
141 | |||
142 | int touchscreen_read_device(int *data, int *old_data) | ||
143 | { | ||
144 | int btn = BUTTON_NONE; | ||
145 | static bool touch_hold = false; | ||
146 | static long last_touch = 0; | ||
147 | |||
148 | if (touch_available || touch_hold) | ||
149 | { | ||
150 | short x_touch, y_touch; | ||
151 | static short last_x = 0, last_y = 0; | ||
152 | |||
153 | if (touch_hold) | ||
154 | { | ||
155 | /* get rid of very fast unintended double touches */ | ||
156 | x_touch = last_x; | ||
157 | y_touch = last_y; | ||
158 | } | ||
159 | else | ||
160 | { | ||
161 | /* sort the 5 data taken and use the median value */ | ||
162 | qsort(x, NO_OF_TOUCH_DATA, sizeof(short), short_cmp); | ||
163 | qsort(y, NO_OF_TOUCH_DATA, sizeof(short), short_cmp); | ||
164 | |||
165 | x_touch = last_x = x[(NO_OF_TOUCH_DATA - 1)/2]; | ||
166 | y_touch = last_y = y[(NO_OF_TOUCH_DATA - 1)/2]; | ||
167 | |||
168 | last_touch = current_tick; | ||
169 | |||
170 | touch_hold = true; | ||
171 | touch_available = false; | ||
172 | } | ||
173 | |||
174 | *old_data = *data = touch_to_pixels(x_touch, y_touch); | ||
175 | |||
176 | btn |= touchscreen_to_pixels((*data&0xffff0000) >> 16, | ||
177 | (*data&0x0000ffff), | ||
178 | data); | ||
179 | } | ||
180 | |||
181 | if (TIME_AFTER(current_tick, last_touch + 10)) | ||
182 | { | ||
183 | /* put the touchscreen back into interrupt mode */ | ||
184 | touch_hold = false; | ||
185 | } | ||
186 | |||
187 | return btn; | ||
188 | } | ||
189 | |||
190 | |||