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
|
/*
ChibiOS/GFX - Copyright (C) 2012, 2013
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 drivers/ginput/touch/STMPE811/ginput_lld_mouse.c
* @brief GINPUT Touch low level driver source for the STMPE811.
*
* @defgroup Mouse Mouse
* @ingroup GINPUT
* @{
*/
#include "ch.h"
#include "hal.h"
#include "gfx.h"
#include "stmpe811.h"
#if (GFX_USE_GINPUT && GINPUT_NEED_MOUSE) /*|| defined(__DOXYGEN__)*/
#include "ginput/lld/mouse.h"
#if defined(GINPUT_MOUSE_USE_CUSTOM_BOARD) && GINPUT_MOUSE_USE_CUSTOM_BOARD
#include "ginput_lld_mouse_board.h"
#elif defined(BOARD_EMBEST_DMSTF4BB)
#include "ginput_lld_mouse_board_embest_dmstf4bb.h"
#else
#include "ginput_lld_mouse_board_example.h"
#endif
static coord_t lastx, lasty, lastz;
/* set the active window of the stmpe811. bl is bottom left, tr is top right */
static void setActiveWindow(uint16_t bl_x, uint16_t bl_y, uint16_t tr_x, uint16_t tr_y)
{
write_reg(STMPE811_REG_WDW_TR_X, 2, tr_x);
write_reg(STMPE811_REG_WDW_TR_Y, 2, tr_y);
write_reg(STMPE811_REG_WDW_BL_X, 2, bl_x);
write_reg(STMPE811_REG_WDW_BL_Y, 2, bl_y);
}
/**
* @brief Initialise the mouse/touch.
*
* @notapi
*/
void ginput_lld_mouse_init(void)
{
init_board();
write_reg(STMPE811_REG_SYS_CTRL1, 1, 0x02); // Software chip reset
chThdSleepMilliseconds(10);
write_reg(STMPE811_REG_SYS_CTRL2, 1, 0x0C); // Temperature sensor clock off, GPIO clock off, touch clock on, ADC clock on
write_reg(STMPE811_REG_INT_EN, 1, 0x02); // Interrupt on INT pin when FIFO is equal or above threshold value OR touch is detected
write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internal voltage refernce
chThdSleepMilliseconds(2);
write_reg(STMPE811_REG_ADC_CTRL2, 1, 0x01); // ADC speed 3.25MHz
write_reg(STMPE811_REG_GPIO_AF, 1, 0x00); // GPIO alternate function - OFF
write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, touch detect delay 500 us, panel driver settling time 500 us
write_reg(STMPE811_REG_FIFO_TH, 1, 0x01); // FIFO threshold = 1
write_reg(STMPE811_REG_FIFO_STA, 1, 0x01); // FIFO reset enable
write_reg(STMPE811_REG_FIFO_STA, 1, 0x00); // FIFO reset disable
write_reg(STMPE811_REG_TSC_FRACT_XYZ, 1, 0x07); // Z axis data format
write_reg(STMPE811_REG_TSC_I_DRIVE, 1, 0x01); // 50mA touchscreen line current
write_reg(STMPE811_REG_TSC_CTRL, 1, 0x01); // X&Y&Z, TSC enable
write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // Clear all interrupts
write_reg(STMPE811_REG_INT_CTRL, 1, 0x01); // Level interrupt, enable intrrupts
}
/**
* @brief Read the mouse/touch position.
*
* @param[in] pt A pointer to the structure to fill
*
* @note For drivers that don't support returning a position
* when the touch is up (most touch devices), it should
* return the previous position with the new Z value.
* The z value is the pressure for those touch devices
* that support it (-100 to 100 where > 0 is touched)
* or, 0 or 100 for those drivers that don't.
*
* @notapi
*/
void ginput_lld_mouse_get_reading(MouseReading *pt)
{
//uint16_t buf;
uint8_t int_status;
// If not touched, return the previous results
if (!getpin_pressed()) {
pt->x = lastx;
pt->y = lasty;
pt->z = 0;
pt->buttons = 0;
return;
}
// Find out what caused an interrupt
int_status = read_reg(STMPE811_REG_INT_STA, 1);
// If it is TOUCH interrupt, clear it and go on
if (int_status & 0x02) {
uint8_t size = 0;
size = read_reg(STMPE811_REG_FIFO_SIZE, 1);
if (size) {
uint8_t buffer[size * 4];
read_reg_n(STMPE811_REG_TSC_DATA_AI, size * 4, buffer);
lastx = (coord_t)((buffer[0] << 4) | (buffer[1] >> 4));
lasty = (coord_t)(((buffer[1] & 0x0F) << 8) | buffer[2]);
lastz = (coord_t)buffer[3];
/* Get the X value */
//buf = read_reg(STMPE811_REG_TSC_DATA_X, 2);
//lastx = (coord_t)(buf);
/* Get the Y value */
//buf = read_reg(STMPE811_REG_TSC_DATA_Y, 2);
//lasty = (coord_t)(buf);
/* Get the Z value */
//buf = read_reg(STMPE811_REG_TSC_DATA_Z, 1);
//lastz = (buf & 0x00FF);
// Return the results. ADC gives values from 0 to 2^12
pt->x = 320 - lastx / 13;
pt->y = lasty / 17;
pt->z = lastz;
pt->buttons = GINPUT_TOUCH_PRESSED;
}
write_reg(STMPE811_REG_INT_STA, 1, 0x02);
}
}
#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
/** @} */
|