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
|
/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "gfx.h"
#if GFX_USE_GINPUT && GINPUT_NEED_MOUSE
#define GMOUSE_DRIVER_VMT GMOUSEVMT_STMPE610
#include "../../../../src/ginput/ginput_driver_mouse.h"
// Hardware definitions
#include "stmpe610.h"
// Get the hardware interface
#include "gmouse_lld_STMPE610_board.h"
// Extra settings for the users gfxconf.h file. See readme.txt
#ifndef GMOUSE_STMPE610_SELF_CALIBRATE
#define GMOUSE_STMPE610_SELF_CALIBRATE GFXOFF
#endif
#ifndef GMOUSE_STMPE610_READ_PRESSURE
#define GMOUSE_STMPE610_READ_PRESSURE GFXOFF
#endif
#ifndef GMOUSE_STMPE610_TEST_MODE
#define GMOUSE_STMPE610_TEST_MODE GFXOFF
#endif
/**
* Notes:
*
* This chip has some problems which required careful coding to overcome.
*
* The interrupt pin seems to be unreliable, at least on some boards, so we at most
* use the pin for filtering results to reduce cpu load.
* The symptoms are that readings will just stop due to the irq not being asserted
* even though there are items in the fifo. Another interrupt source such as a
* touch transition will restart the irq.
*
* There is no fifo entry created when a touch up event occurs. We must therefore
* generate a pseudo result on touch up. Fortunately the touch detection appears
* reliable and so we turn off the driver GMOUSE_VFLG_POORUPDOWN setting. In practice
* if touch is up we always return a pseudo event as this saves having to remember the
* previous touch state.
*
* Z readings range from around 90 (fully touched) to around 150 (on the verge of non-touched).
* Note the above is on the STM32F429i-Discovery board. Other boards may be different.
* To be conservative we use 255 as touch off, anything else is a touch on.
*
* GMOUSE_STMPE610_TEST_MODE is designed to be used with the "touch_raw_readings" tool which shows
* a steady stream of raw readings.
*
* Settings that may need tweaking on other hardware:
* The settling times. We have set these conservatively at 1ms.
* The reading window. We set this to 16 just to reduce noise. High-res panels may need a lower value.
*/
static gBool MouseInit(GMouse* m, unsigned driverinstance) {
if (!init_board(m, driverinstance))
return gFalse;
aquire_bus(m);
write_reg(m, STMPE610_REG_SYS_CTRL1, 0x02); // Software chip reset
gfxSleepMilliseconds(10);
write_reg(m, STMPE610_REG_SYS_CTRL2, 0x04); // Temperature sensor clock off, GPIO clock off, touch clock on, ADC clock on
#if GMOUSE_STMPE610_GPIO_IRQPIN
write_reg(m, STMPE610_REG_INT_EN, 0x03); // Interrupt on INT pin when there is a sample or a touch transition.
#else
write_reg(m, STMPE610_REG_INT_EN, 0x00); // Don't Interrupt on INT pin
#endif
write_reg(m, STMPE610_REG_ADC_CTRL1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internal voltage refernce
gfxSleepMilliseconds(2);
write_reg(m, STMPE610_REG_ADC_CTRL2, 0x01); // ADC speed 3.25MHz
write_reg(m, STMPE610_REG_GPIO_AF, 0x00); // GPIO alternate function - OFF
write_reg(m, STMPE610_REG_TSC_CFG, 0xA3); // Averaging 4, touch detect delay 1ms, panel driver settling time 1ms
write_reg(m, STMPE610_REG_FIFO_TH, 0x01); // FIFO threshold = 1
write_reg(m, STMPE610_REG_FIFO_STA, 0x01); // FIFO reset enable
write_reg(m, STMPE610_REG_FIFO_STA, 0x00); // FIFO reset disable
write_reg(m, STMPE610_REG_TSC_FRACT_XYZ, 0x07); // Z axis data format
write_reg(m, STMPE610_REG_TSC_I_DRIVE, 0x01); // max 50mA touchscreen line current
#if GMOUSE_STMPE610_READ_PRESSURE
write_reg(m, STMPE610_REG_TSC_CTRL, 0x30); // X&Y&Z, 16 reading window
write_reg(m, STMPE610_REG_TSC_CTRL, 0x31); // X&Y&Z, 16 reading window, TSC enable
#else
write_reg(m, STMPE610_REG_TSC_CTRL, 0x32); // X&Y, 16 reading window
write_reg(m, STMPE610_REG_TSC_CTRL, 0x33); // X&Y, 16 reading window, TSC enable
#endif
write_reg(m, STMPE610_REG_INT_STA, 0xFF); // Clear all interrupts
write_reg(m, STMPE610_REG_INT_CTRL, 0x01); // Level interrupt, enable interrupts
release_bus(m);
return gTrue;
}
static gBool read_xyz(GMouse* m, GMouseReading* pdr)
{
#if GMOUSE_STMPE610_TEST_MODE
static GMouseReading n;
#endif
uint8_t status;
// Button information will be regenerated
pdr->buttons = 0;
#if GMOUSE_STMPE610_TEST_MODE
aquire_bus(m);
// Set the buttons to match various touch signals
if ((read_byte(m, STMPE610_REG_TSC_CTRL) & 0x80))
pdr->buttons |= 0x02;
status = read_byte(m, STMPE610_REG_FIFO_STA);
if (!(status & 0x20))
pdr->buttons |= 0x04;
#if GMOUSE_STMPE610_GPIO_IRQPIN
if (getpin_irq(m))
pdr->buttons |= 0x08;
#endif
if ((status & 0x20)) {
// Nothing in the fifo - just return the last position and pressure
pdr->x = n.x;
pdr->y = n.y;
pdr->z = n.z;
#if GMOUSE_STMPE610_GPIO_IRQPIN
write_reg(m, STMPE610_REG_INT_STA, 0xFF);
#endif
release_bus(m);
return gTrue;
}
#else
// Is there a new sample or a touch transition
#if GMOUSE_STMPE610_GPIO_IRQPIN
if(!getpin_irq(m))
return gFalse;
#endif
// Is there something in the fifo
status = read_byte(m, STMPE610_REG_FIFO_STA);
if ((status & 0x20)) {
// Nothing in the fifo.
// If not touched return the pseudo result
if (!(read_byte(m, STMPE610_REG_TSC_CTRL) & 0x80)) {
pdr->z = gmvmt(m)->z_min;
#if GMOUSE_STMPE610_GPIO_IRQPIN
write_reg(m, STMPE610_REG_INT_STA, 0xFF);
#endif
release_bus(m);
return gTrue;
}
// No new result
#if GMOUSE_STMPE610_GPIO_IRQPIN
write_reg(m, STMPE610_REG_INT_STA, 0xFF);
#endif
release_bus(m);
return gFalse;
}
#endif
// Time to get some readings
pdr->x = (gCoord)read_word(m, STMPE610_REG_TSC_DATA_X);
pdr->y = (gCoord)read_word(m, STMPE610_REG_TSC_DATA_Y);
#if GMOUSE_STMPE610_READ_PRESSURE
pdr->z = (gCoord)read_byte(m, STMPE610_REG_TSC_DATA_Z);
#else
pdr->z = gmvmt(m)->z_max;
#endif
#if !GMOUSE_STMPE610_SLOW_CPU
if (!(status & 0xC0)) {
// Is there more data to come
if (!(read_byte(m, STMPE610_REG_FIFO_STA) & 0x20))
_gmouseWakeup(m);
} else
#endif
// Clear the rest of the fifo
{
write_reg(m, STMPE610_REG_FIFO_STA, 0x01); // FIFO reset enable
write_reg(m, STMPE610_REG_FIFO_STA, 0x00); // FIFO reset disable
}
// All done
#if GMOUSE_STMPE610_GPIO_IRQPIN
write_reg(m, STMPE610_REG_INT_STA, 0xFF);
#endif
release_bus(m);
#if GMOUSE_STMPE610_TEST_MODE
// Save the result for later
n.x = pdr->x;
n.y = pdr->y;
n.z = pdr->z;
#endif
// Rescale X,Y if we are using self-calibration
#if GMOUSE_STMPE610_SELF_CALIBRATE
#if GDISP_NEED_CONTROL
switch(gdispGGetOrientation(m->display)) {
default:
case gOrientation0:
case gOrientation180:
default:
pdr->x = pdr->x / (4096/gdispGGetWidth(m->display));
pdr->y = pdr->y / (4096/gdispGGetHeight(m->display));
break;
case gOrientation90:
case gOrientation270:
pdr->x = pdr->x / (4096/gdispGGetHeight(m->display));
pdr->y = pdr->y / (4096/gdispGGetWidth(m->display));
break;
}
#else
pdr->x = pdr->x / (4096/gdispGGetWidth(m->display));
pdr->y = pdr->y / (4096/gdispGGetHeight(m->display));
#endif
#endif
return gTrue;
}
const GMouseVMT const GMOUSE_DRIVER_VMT[1] = {{
{
GDRIVER_TYPE_TOUCH,
#if GMOUSE_STMPE610_SELF_CALIBRATE
GMOUSE_VFLG_TOUCH | GMOUSE_VFLG_ONLY_DOWN,
#else
GMOUSE_VFLG_TOUCH | GMOUSE_VFLG_ONLY_DOWN | GMOUSE_VFLG_CALIBRATE | GMOUSE_VFLG_CAL_TEST,
#endif
sizeof(GMouse) + GMOUSE_STMPE610_BOARD_DATA_SIZE,
_gmouseInitDriver,
_gmousePostInitDriver,
_gmouseDeInitDriver
},
0, // z_max - 0 indicates full touch
255, // z_min
150, // z_touchon
255, // z_touchoff
{ // pen_jitter
GMOUSE_STMPE610_PEN_CALIBRATE_ERROR, // calibrate
GMOUSE_STMPE610_PEN_CLICK_ERROR, // click
GMOUSE_STMPE610_PEN_MOVE_ERROR // move
},
{ // finger_jitter
GMOUSE_STMPE610_FINGER_CALIBRATE_ERROR, // calibrate
GMOUSE_STMPE610_FINGER_CLICK_ERROR, // click
GMOUSE_STMPE610_FINGER_MOVE_ERROR // move
},
MouseInit, // init
0, // deinit
read_xyz, // get
0, // calsave
0 // calload
}};
#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
|
