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
|
/*
* 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/base/Mikromedia-STM32-M4-ILI9341/ginput_lld_mouse_board.h
* @brief GINPUT Touch low level driver source for the MCU.
*/
#ifndef _GINPUT_LLD_MOUSE_BOARD_H
#define _GINPUT_LLD_MOUSE_BOARD_H
/* read ADC if more than this many ticks since last read */
#define ADC_UPDATE_INTERVAL 3
#define ADC_NUM_CHANNELS 2
#define ADC_BUF_DEPTH 1
static const ADCConversionGroup adcgrpcfg = {
FALSE,
ADC_NUM_CHANNELS,
NULL,
NULL,
/* HW dependent part.*/
0,
ADC_CR2_SWSTART,
0,
0,
ADC_SQR1_NUM_CH(ADC_NUM_CHANNELS),
0,
ADC_SQR3_SQ2_N(ADC_CHANNEL_IN8) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN9)
};
static systime_t last_update;
static volatile uint16_t tpx, tpy, detect;
static inline void delay(uint16_t dly) {
static uint16_t i;
for(i = 0; i < dly; i++)
asm("nop");
}
void read_mikro_tp(void) {
systime_t now = chTimeNow();
adcsample_t samples[ADC_NUM_CHANNELS * ADC_BUF_DEPTH];
uint16_t _detect, _tpx, _tpy;
if(now < last_update || ((now - last_update) > ADC_UPDATE_INTERVAL)) {
// detect button press
// sample[0] will go from ~200 to ~4000 when pressed
adcConvert(&ADCD1, &adcgrpcfg, samples, ADC_BUF_DEPTH);
_detect = samples[0];
// read x channel
palSetPad(GPIOB, GPIOB_DRIVEA);
palClearPad(GPIOB, GPIOB_DRIVEB);
chThdSleepMilliseconds(1);
adcConvert(&ADCD1, &adcgrpcfg, samples, ADC_BUF_DEPTH);
_tpx = samples[1];
// read y channel (invert)
palClearPad(GPIOB, GPIOB_DRIVEA);
palSetPad(GPIOB, GPIOB_DRIVEB);
chThdSleepMilliseconds(1);
adcConvert(&ADCD1, &adcgrpcfg, samples, ADC_BUF_DEPTH);
_tpy = samples[0];
// ready for next read
palClearPad(GPIOB, GPIOB_DRIVEA);
palClearPad(GPIOB, GPIOB_DRIVEB);
chSysLock();
tpx = _tpx;
tpy = _tpy;
detect = _detect;
last_update = now;
chSysUnlock();
}
}
/**
* @brief Initialise the board for the touch.
*
* @notapi
*/
static inline void init_board(void) {
adcStart(&ADCD1, NULL);
last_update = chTimeNow();
// leave DRIVEA & DRIVEB ready for next read
palClearPad(GPIOB, GPIOB_DRIVEA);
palClearPad(GPIOB, GPIOB_DRIVEB);
chThdSleepMilliseconds(1);
}
/**
* @brief Check whether the surface is currently touched
* @return TRUE if the surface is currently touched
*
* @notapi
*/
static inline bool_t getpin_pressed(void) {
read_mikro_tp();
return (detect > 2000) ? true : false;
}
/**
* @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) {
read_mikro_tp();
return tpx;
}
/**
* @brief Read an y value from touch controller
* @return The value read from the controller
*
* @notapi
*/
static inline uint16_t read_y_value(void) {
read_mikro_tp();
return tpy;
}
#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
|
