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
|
#include "touchpad.h"
#include "glcd.h"
static struct cal cal = {
1, 1, 0, 0
};
static const SPIConfig spicfg = {
NULL,
GPIOC,
TP_CS,
SPI_CR1_SPE | SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0,
};
void tpInit(SPIDriver *spip) {
spiStart(spip, &spicfg);
}
static __inline uint16_t readX(void) {
uint8_t txbuf[1];
uint8_t rxbuf[2];
uint16_t x;
txbuf[0] = 0xd0;
SET_CS(0);
spiSend(&SPID1, 1, txbuf);
spiReceive(&SPID1, 2, rxbuf);
SET_CS(1);
x = rxbuf[0] << 4;
x |= rxbuf[1] >> 4;
return x;
}
static __inline uint16_t readY(void) {
uint8_t txbuf[1];
uint8_t rxbuf[2];
uint16_t y;
txbuf[0] = 0x90;
SET_CS(0);
spiSend(&SPID1, 1, txbuf);
spiReceive(&SPID1, 2, rxbuf);
SET_CS(1);
y = rxbuf[0] << 4;
y |= rxbuf[1] >> 4;
return y;
}
uint8_t tpIRQ(void) {
return (!palReadPad(TP_PORT, TP_IRQ));
}
static uint16_t tpReadRealX(void) {
uint32_t results = 0;
uint16_t i, x;
for(i=0; i<CONVERSIONS; i++) {
readX();
results += readX();
}
x = (((SCREEN_WIDTH-1) * (results/CONVERSIONS)) / 2048);
return x;
}
static uint16_t tpReadRealY(void) {
uint32_t results = 0;
uint16_t i, y;
for(i=0; i<CONVERSIONS; i++) {
readY();
results += readY();
}
y = (((SCREEN_HEIGHT-1) * (results/CONVERSIONS)) / 2048);
return y;
}
uint16_t tpReadX(void) {
uint16_t x, y;
x = cal.xm * tpReadRealX() + cal.xn;
y = cal.ym * tpReadRealY() + cal.yn;
switch(lcdGetOrientation()) {
case portrait:
return x;
case landscape:
return SCREEN_HEIGHT - y;
case portraitInv:
return SCREEN_WIDTH - x;
case landscapeInv:
return y;
}
return x;
}
uint16_t tpReadY(void) {
uint16_t x, y;
x = cal.xm * tpReadRealX() + cal.xn;
y = cal.ym * tpReadRealY() + cal.yn;
switch(lcdGetOrientation()) {
case portrait:
return y;
case landscape:
return x;
case portraitInv:
return SCREEN_HEIGHT - y;
case landscapeInv:
return SCREEN_WIDTH - x;
}
return y;
}
static void tpDrawCross(uint16_t x, uint16_t y) {
lcdDrawLine(x-15, y, x-2, y, 0xffff);
lcdDrawLine(x+2, y, x+15, y, 0xffff);
lcdDrawLine(x, y-15, x, y-2, 0xffff);
lcdDrawLine(x, y+2, x, y+15, 0xffff);
lcdDrawLine(x-15, y+15, x-7, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x-15, y+7, x-15, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x-15, y-15, x-7, y-15, RGB565CONVERT(184,158,131));
lcdDrawLine(x-15, y-7, x-15, y-15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+7, y+15, x+15, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+15, y+7, x+15, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+7, y-15, x+15, y-15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+15, y-15, x+15, y-7, RGB565CONVERT(184,158,131));
}
void tpCalibrate(void) {
uint16_t cross[2][2] = {{40,40}, {200, 280}};
uint16_t points[2][2];
uint8_t i;
lcdSetOrientation(portrait);
lcdClear(Red);
lcdDrawString(40, 10, "Touchpad Calibration", White, Red);
for(i=0; i<2; i++) {
tpDrawCross(cross[i][0], cross[i][1]);
while(!tpIRQ());
points[i][0] = tpReadRealX();
points[i][1] = tpReadRealY();
while(tpIRQ());
lcdFillArea(cross[i][0]-15, cross[i][1]-15, cross[i][0]+16, cross[i][1]+16, 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];
}
|
