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root/truck/DashInterface/Display.cpp
Revision: 28
Committed: 2008-02-25T21:13:59-08:00 (14 years, 11 months ago) by douglas
File size: 5316 byte(s)
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# Content
1 // Display (Crystalfontz CFA-635 USB LCD)
2 //
3 // Douglas Thrift
4 //
5 // $Id$
6
7 #include <foreach.hpp>
8
9 #include <iostream>
10
11 #include <fcntl.h>
12 #include <termios.h>
13
14 #include "Display.hpp"
15
16 extern bool debug;
17
18 static uint16_t GetCRC(uint8_t *buffer, size_t length)
19 {
20 static const uint16_t table[256] = {
21 0x00000,0x01189,0x02312,0x0329B,0x04624,0x057AD,0x06536,0x074BF,
22 0x08C48,0x09DC1,0x0AF5A,0x0BED3,0x0CA6C,0x0DBE5,0x0E97E,0x0F8F7,
23 0x01081,0x00108,0x03393,0x0221A,0x056A5,0x0472C,0x075B7,0x0643E,
24 0x09CC9,0x08D40,0x0BFDB,0x0AE52,0x0DAED,0x0CB64,0x0F9FF,0x0E876,
25 0x02102,0x0308B,0x00210,0x01399,0x06726,0x076AF,0x04434,0x055BD,
26 0x0AD4A,0x0BCC3,0x08E58,0x09FD1,0x0EB6E,0x0FAE7,0x0C87C,0x0D9F5,
27 0x03183,0x0200A,0x01291,0x00318,0x077A7,0x0662E,0x054B5,0x0453C,
28 0x0BDCB,0x0AC42,0x09ED9,0x08F50,0x0FBEF,0x0EA66,0x0D8FD,0x0C974,
29 0x04204,0x0538D,0x06116,0x0709F,0x00420,0x015A9,0x02732,0x036BB,
30 0x0CE4C,0x0DFC5,0x0ED5E,0x0FCD7,0x08868,0x099E1,0x0AB7A,0x0BAF3,
31 0x05285,0x0430C,0x07197,0x0601E,0x014A1,0x00528,0x037B3,0x0263A,
32 0x0DECD,0x0CF44,0x0FDDF,0x0EC56,0x098E9,0x08960,0x0BBFB,0x0AA72,
33 0x06306,0x0728F,0x04014,0x0519D,0x02522,0x034AB,0x00630,0x017B9,
34 0x0EF4E,0x0FEC7,0x0CC5C,0x0DDD5,0x0A96A,0x0B8E3,0x08A78,0x09BF1,
35 0x07387,0x0620E,0x05095,0x0411C,0x035A3,0x0242A,0x016B1,0x00738,
36 0x0FFCF,0x0EE46,0x0DCDD,0x0CD54,0x0B9EB,0x0A862,0x09AF9,0x08B70,
37 0x08408,0x09581,0x0A71A,0x0B693,0x0C22C,0x0D3A5,0x0E13E,0x0F0B7,
38 0x00840,0x019C9,0x02B52,0x03ADB,0x04E64,0x05FED,0x06D76,0x07CFF,
39 0x09489,0x08500,0x0B79B,0x0A612,0x0D2AD,0x0C324,0x0F1BF,0x0E036,
40 0x018C1,0x00948,0x03BD3,0x02A5A,0x05EE5,0x04F6C,0x07DF7,0x06C7E,
41 0x0A50A,0x0B483,0x08618,0x09791,0x0E32E,0x0F2A7,0x0C03C,0x0D1B5,
42 0x02942,0x038CB,0x00A50,0x01BD9,0x06F66,0x07EEF,0x04C74,0x05DFD,
43 0x0B58B,0x0A402,0x09699,0x08710,0x0F3AF,0x0E226,0x0D0BD,0x0C134,
44 0x039C3,0x0284A,0x01AD1,0x00B58,0x07FE7,0x06E6E,0x05CF5,0x04D7C,
45 0x0C60C,0x0D785,0x0E51E,0x0F497,0x08028,0x091A1,0x0A33A,0x0B2B3,
46 0x04A44,0x05BCD,0x06956,0x078DF,0x00C60,0x01DE9,0x02F72,0x03EFB,
47 0x0D68D,0x0C704,0x0F59F,0x0E416,0x090A9,0x08120,0x0B3BB,0x0A232,
48 0x05AC5,0x04B4C,0x079D7,0x0685E,0x01CE1,0x00D68,0x03FF3,0x02E7A,
49 0x0E70E,0x0F687,0x0C41C,0x0D595,0x0A12A,0x0B0A3,0x08238,0x093B1,
50 0x06B46,0x07ACF,0x04854,0x059DD,0x02D62,0x03CEB,0x00E70,0x01FF9,
51 0x0F78F,0x0E606,0x0D49D,0x0C514,0x0B1AB,0x0A022,0x092B9,0x08330,
52 0x07BC7,0x06A4E,0x058D5,0x0495C,0x03DE3,0x02C6A,0x01EF1,0x00F78,
53 };
54 register uint16_t crc(0xffff);
55
56 while (length--)
57 crc = (crc >> 8) ^ table[(crc ^ *buffer++) & 0xff];
58
59 return ~crc;
60 }
61
62 Display::Packet::Packet(Display::Packet::Command command, uint8_t length, const uint8_t *data) : command(command), length(length)
63 {
64 if (length > sizeof (this->data))
65 throw;
66
67 ::memcpy(this->data, data, length);
68
69 crc = GetCRC(reinterpret_cast<uint8_t *>(this), length + 2);
70 }
71
72 void operator<<(int fd, const Display::Packet::Packet &packet)
73 {
74 if (packet.length != sizeof (packet.data))
75 ::memcpy(const_cast<uint8_t *>(packet.data) + packet.length, &packet.crc, 2);
76
77 Posix::Write(fd, &packet, packet.length + 4);
78 }
79
80 void operator>>(int fd, Display::Packet::Packet &packet)
81 {
82 Posix::Read(fd, &packet, 2);
83 Posix::Read(fd, packet.data, packet.length);
84 Posix::Read(fd, &packet.crc, 2);
85
86 if (debug)
87 {
88 char *data;
89
90 ::asprintf(&data, "0x%02x %i ", packet.command, packet.length);
91
92 std::cerr << data << '[' << packet.GetData() << ']' << std::endl;
93
94 std::free(data);
95 }
96 }
97
98 Display::Display(const std::string &device) : ucom(Posix::Open(device, O_RDWR | O_NOCTTY))
99 {
100 ::termios state;
101
102 Posix::CheckError(::tcgetattr(ucom, &state));
103 Posix::CheckError(::cfsetospeed(&state, B115200));
104 Posix::CheckError(::cfsetispeed(&state, B115200));
105
106 state.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXOFF);
107 state.c_iflag |= IGNPAR;
108 state.c_oflag &= ~(OPOST | ONLCR | ONOCR | ONLRET);
109 state.c_cflag &= ~(CSIZE | PARENB | PARODD | HUPCL | CRTSCTS);
110 state.c_cflag |= CREAD | CS8 | CSTOPB | CLOCAL;
111 state.c_lflag &= ~(ISIG | ICANON | IEXTEN | ECHO);
112 state.c_lflag |= NOFLSH;
113
114 Posix::CheckError(::tcsetattr(ucom, TCSANOW, &state));
115 }
116
117 Display::Packet Display::Communicate(Display::Packet::Command command, uint8_t length, const uint8_t *data)
118 {
119 Packet packet(command, length, data), response;
120
121 ucom << packet;
122
123 _forever
124 {
125 ucom >> response;
126
127 if (packet.command | Packet::Response == response.command)
128 return response;
129
130 switch (response.command)
131 {
132 case Packet::KeyActivity:
133 keyActivity.push(response);
134
135 break;
136 case Packet::FanSpeedReport:
137 case Packet::TemperatureSensorReport:
138 break;
139 }
140 }
141 }
142
143 bool Display::Ping(const std::string &data)
144 {
145 return data == Communicate(Packet::PingCommand, data).GetData();
146 }
147
148 std::string Display::Version()
149 {
150 return Communicate(Packet::GetHardwareAndFirmwareVersion).GetData();
151 }
152
153 void Display::SetCursorPosition(uint8_t column, uint8_t row)
154 {
155 const uint8_t data[] = { column, row };
156
157 Communicate(Packet::SetLCDCursorPosition, 2, data);
158 }
159
160 void Display::SetCursorStyle(Display::CursorStyle style)
161 {
162 uint8_t data(style);
163
164 Communicate(Packet::SetLCDCursorStyle, 1, &data);
165 }
166
167 void Display::KeyReporting(uint8_t press, uint8_t release)
168 {
169 const uint8_t data[] = { press, release };
170
171 Communicate(Packet::ConfigureKeyReporting, 2, data);
172 }

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