1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
/* ChibiOS/GFX - Copyright (C) 2012
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS/GFX.
ChibiOS/GFX 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 3 of the License, or
(at your option) any later version.
ChibiOS/GFX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file touchpad.c
* @brief Touchpad Driver code.
*
* @addgroup TOUCHPAD
* @{
*/
#include "ch.h"
#include "hal.h"
#include "gdisp.h"
#include "touchpad.h"
#if GFX_USE_TOUCHPAD || defined(__DOXYGEN__)
#if TOUCHPAD_STORE_CALIBRATION
extern void tp_store_calibration_lld(struct cal_t *cal);
extern struct cal_t *tp_restore_calibration_lld(void);
#endif
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
static struct cal_t *cal;
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief returns the uncalibrated readout of the X direction from the controller
*
* @noapi
*/
static uint16_t _tpReadRealX(void) {
uint32_t results = 0;
uint16_t i, x;
/* Median filtering is already done in LLD */
for(i = 0; i < CONVERSIONS; i++) {
results += tp_lld_read_x();
}
/* Take the average of the readings */
x = results / CONVERSIONS;
return x;
}
/**
* @brief return the uncalibrated readout of the Y-direction from the controller
*
* @noapi
*/
static uint16_t _tpReadRealY(void) {
uint32_t results = 0;
uint16_t i, y;
/* Median filtering is already done in LLD */
for(i = 0; i < CONVERSIONS; i++) {
results += tp_lld_read_y();
}
/* Take the average of the readings */
y = results / CONVERSIONS;
return y;
}
/**
* @brief draws a cross. Used for calibration.
*
* @noapi
*/
static void _tpDrawCross(uint16_t x, uint16_t y) {
gdispDrawLine(x-15, y, x-2, y, 0xffff);
gdispDrawLine(x+2, y, x+15, y, 0xffff);
gdispDrawLine(x, y-15, x, y-2, 0xffff);
gdispDrawLine(x, y+2, x, y+15, 0xffff);
gdispDrawLine(x-15, y+15, x-7, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x-15, y+7, x-15, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x-15, y-15, x-7, y-15, RGB565CONVERT(184,158,131));
gdispDrawLine(x-15, y-7, x-15, y-15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+7, y+15, x+15, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+15, y+7, x+15, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+7, y-15, x+15, y-15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+15, y-15, x+15, y-7, RGB565CONVERT(184,158,131));
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Touchpad Driver initialization.
* @note This function is NOT currently implicitly invoked by @p halInit().
* It must be called manually.
*
* @api
*/
void tpInit(const TOUCHPADDriver *tp) {
cal = (struct cal_t*)chHeapAlloc(NULL, sizeof(struct cal_t));
if(cal == NULL)
return;
/* Initialise Mutex */
//MUTEX_INIT
/* Initialise driver */
//MUTEX_ENTER
tp_lld_init(tp);
//MUTEX_EXIT
#if TOUCHPAD_STORE_CALIBRATION
cal = tp_restore_calibration_lld();
if(cal == NULL) {
cal = (struct cal_t*)chHeapAlloc(NULL, sizeof(struct cal_t));
tpCalibrate();
}
#endif
}
/**
* @brief Get the X-Coordinate, relative to screen zero point.
*
* @return The X position in pixels.
*
* @api
*/
uint16_t tpReadX(void) {
uint16_t x, y;
#if TOUCHPAD_XY_INVERTED == TRUE
x = cal->xm * _tpReadRealY() + cal->xn;
y = cal->ym * _tpReadRealX() + cal->yn;
#else
x = cal->xm * _tpReadRealX() + cal->xn;
y = cal->ym * _tpReadRealY() + cal->yn;
#endif
switch(gdispGetOrientation()) {
case GDISP_ROTATE_0:
return x;
case GDISP_ROTATE_90:
return y;
case GDISP_ROTATE_180:
return GDISP_SCREEN_WIDTH - x - 1;
case GDISP_ROTATE_270:
return GDISP_SCREEN_HEIGHT - y - 1;
}
return 0;
}
/**
* @brief Get the X-Coordinate, relative to screen zero point.
*
* @return The Y position in pixels.
*
* @api
*/
uint16_t tpReadY(void) {
uint16_t x, y;
#if TOUCHPAD_XY_INVERTED == TRUE
x = cal->xm * _tpReadRealY() + cal->xn;
y = cal->ym * _tpReadRealX() + cal->yn;
#else
x = cal->xm * _tpReadRealX() + cal->xn;
y = cal->ym * _tpReadRealY() + cal->yn;
#endif
switch(gdispGetOrientation()) {
case GDISP_ROTATE_0:
return y;
case GDISP_ROTATE_90:
return GDISP_SCREEN_WIDTH - x - 1;
case GDISP_ROTATE_180:
return GDISP_SCREEN_HEIGHT - y - 1;
case GDISP_ROTATE_270:
return x;
}
return 0;
}
void tpCalibrate(void) {
const uint16_t h = gdispGetHeight();
const uint16_t w = gdispGetWidth();
const uint16_t cross[2][2] = {{(w/8), (h/8)}, {(w-(w/8)) , (h-(h/8))}};
uint16_t points[2][2];
uint8_t i;
gdispSetOrientation(GDISP_ROTATE_0);
gdispClear(Red);
gdispFillStringBox(0, 10, gdispGetWidth(), 30, "Calibration", &fontUI2Double, White, Red, justifyCenter);
for(i = 0; i < 2; i++) {
_tpDrawCross(cross[i][0], cross[i][1]);
while(!tpIRQ());
points[i][0] = _tpReadRealX();
points[i][1] = _tpReadRealY();
chThdSleepMilliseconds(100);
while(tpIRQ());
gdispFillArea(cross[i][0]-15, cross[i][1]-15, 42, 42, Red);
}
cal->xm = ((float)cross[1][0] - (float)cross[0][0]) / ((float)points[1][0] - (float)points[0][0]);
cal->ym = ((float)cross[1][1] - (float)cross[0][1]) / ((float)points[1][1] - (float)points[0][1]);
cal->xn = (float)cross[0][0] - cal->xm * (float)points[0][0];
cal->yn = (float)cross[0][1] - cal->ym * (float)points[0][1];
#if TOUCHPAD_STORE_CALIBRATION
tp_store_calibration_lld(cal);
#endif
}
/**
* @brief returns if touchpad is pressed or not
*
* @return 1 if pressed, 0 otherwise
*
* @api
*/
#if TOUCHPAD_HAS_IRQ || defined(__DOXYGEN__)
uint8_t tpIRQ(void) {
return tp_lld_irq();
}
#endif
/**
* @brief Get the pressure.
*
* @return The pressure.
*
* @api
*/
#if TOUCHPAD_HAS_PRESSURE || defined(__DOXYGEN__)
uint16_t tpReadZ(void) {
/* ToDo */
return (tp_lld_read_z());
}
#endif
#endif /* GFX_USE_TOUCHPAD */
/** @} */
|
