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
|
/*
* 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
*/
/**
* @file boards/addons/ginput/touch/MCU/ginput_lld_mouse_board_olimex_stm32_lcd.h
* @brief GINPUT Touch low level driver source for the MCU on the example board.
*
* @note This file contains a mix of hardware specific and operating system specific
* code. You will need to change it for your CPU and/or operating system.
*/
#ifndef _GINPUT_LLD_MOUSE_BOARD_H
#define _GINPUT_LLD_MOUSE_BOARD_H
static const ADCConfig ADCC = {
.vref = ADC_VREF_CFG_AVDD_AVSS,
.stime = 15,
.irq = EIC_IRQ_ADC,
.base = _ADC10_BASE_ADDRESS,
};
static struct ADCDriver ADCD;
#define YNEG 13 // U
#define XNEG 15 // R
#define XPOS 12 // L
#define YPOS 11 // D
#define ADC_MAX 1023
#define TOUCH_THRESHOULD 50
static const ADCConversionGroup ADC_X_CG = {
.circular = FALSE,
.num_channels = 1,
.channels = 1 << XNEG,
};
static const ADCConversionGroup ADC_Y_CG = {
.circular = FALSE,
.num_channels = 1,
.channels = 1 << YPOS,
};
/**
* @brief Initialise the board for the touch.
*
* @notapi
*/
static inline void init_board(void) {
adcObjectInit(&ADCD);
adcStart(&ADCD, &ADCC);
}
/**
* @brief Check whether the surface is currently touched
* @return TRUE if the surface is currently touched
*
* @notapi
*/
static inline bool_t getpin_pressed(void) {
adcsample_t samples[2] = {0, };
// Set X+ to ground
palSetPadMode(IOPORTB, XPOS, PAL_MODE_OUTPUT);
palClearPad(IOPORTB, XPOS);
// Set Y- to VCC
palSetPadMode(IOPORTB, YNEG, PAL_MODE_OUTPUT);
palSetPad(IOPORTB, YNEG);
palSetPadMode(IOPORTB, XNEG, PAL_MODE_INPUT_ANALOG);
palSetPadMode(IOPORTB, YPOS, PAL_MODE_INPUT_ANALOG);
adcConvert(&ADCD, &ADC_X_CG, &samples[0], 1);
adcConvert(&ADCD, &ADC_Y_CG, &samples[1], 1);
return (ADC_MAX - (samples[1] - samples[0])) > TOUCH_THRESHOULD;
}
/**
* @brief Aquire the bus ready for readings
*
* @notapi
*/
static inline void aquire_bus(void) {
}
/**
* @brief Release the bus after readings
*
* @notapi
*/
static inline void release_bus(void) {
}
/**
* @brief Read an x value from touch controller
* @return The value read from the controller
*
* @notapi
*/
static inline uint16_t read_x_value(void) {
adcsample_t sample;
palSetPadMode(IOPORTB, XPOS, PAL_MODE_OUTPUT);
palSetPad(IOPORTB, XPOS);
palSetPadMode(IOPORTB, XNEG, PAL_MODE_OUTPUT);
palClearPad(IOPORTB, XNEG);
palSetPadMode(IOPORTB, YNEG, PAL_MODE_INPUT);
palSetPadMode(IOPORTB, YPOS, PAL_MODE_INPUT_ANALOG);
adcConvert(&ADCD, &ADC_Y_CG, &sample, 1);
return ADC_MAX - sample;
}
/**
* @brief Read an y value from touch controller
* @return The value read from the controller
*
* @notapi
*/
static inline uint16_t read_y_value(void) {
adcsample_t sample;
palSetPadMode(IOPORTB, YNEG, PAL_MODE_OUTPUT);
palClearPad(IOPORTB, YNEG);
palSetPadMode(IOPORTB, YPOS, PAL_MODE_OUTPUT);
palSetPad(IOPORTB, YPOS);
palSetPadMode(IOPORTB, XPOS, PAL_MODE_INPUT);
palSetPadMode(IOPORTB, XNEG, PAL_MODE_INPUT_ANALOG);
adcConvert(&ADCD, &ADC_X_CG, &sample, 1);
return ADC_MAX - sample;
}
#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
/** @} */
|