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// Display (Crystalfontz CFA-635 USB LCD) |
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// |
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// Douglas Thrift |
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// |
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// $Id$ |
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|
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#include <iostream> |
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|
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#include <fcntl.h> |
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#include <termios.h> |
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|
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#include "Display.hpp" |
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|
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static uint16_t GetCRC(uint8_t *buffer, size_t length) |
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{ |
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static const uint16_t table[256] = { |
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0x00000,0x01189,0x02312,0x0329B,0x04624,0x057AD,0x06536,0x074BF, |
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0x08C48,0x09DC1,0x0AF5A,0x0BED3,0x0CA6C,0x0DBE5,0x0E97E,0x0F8F7, |
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0x01081,0x00108,0x03393,0x0221A,0x056A5,0x0472C,0x075B7,0x0643E, |
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0x09CC9,0x08D40,0x0BFDB,0x0AE52,0x0DAED,0x0CB64,0x0F9FF,0x0E876, |
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0x02102,0x0308B,0x00210,0x01399,0x06726,0x076AF,0x04434,0x055BD, |
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0x0AD4A,0x0BCC3,0x08E58,0x09FD1,0x0EB6E,0x0FAE7,0x0C87C,0x0D9F5, |
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0x03183,0x0200A,0x01291,0x00318,0x077A7,0x0662E,0x054B5,0x0453C, |
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0x0BDCB,0x0AC42,0x09ED9,0x08F50,0x0FBEF,0x0EA66,0x0D8FD,0x0C974, |
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0x04204,0x0538D,0x06116,0x0709F,0x00420,0x015A9,0x02732,0x036BB, |
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0x0CE4C,0x0DFC5,0x0ED5E,0x0FCD7,0x08868,0x099E1,0x0AB7A,0x0BAF3, |
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0x05285,0x0430C,0x07197,0x0601E,0x014A1,0x00528,0x037B3,0x0263A, |
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0x0DECD,0x0CF44,0x0FDDF,0x0EC56,0x098E9,0x08960,0x0BBFB,0x0AA72, |
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0x06306,0x0728F,0x04014,0x0519D,0x02522,0x034AB,0x00630,0x017B9, |
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0x0EF4E,0x0FEC7,0x0CC5C,0x0DDD5,0x0A96A,0x0B8E3,0x08A78,0x09BF1, |
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0x07387,0x0620E,0x05095,0x0411C,0x035A3,0x0242A,0x016B1,0x00738, |
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0x0FFCF,0x0EE46,0x0DCDD,0x0CD54,0x0B9EB,0x0A862,0x09AF9,0x08B70, |
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0x08408,0x09581,0x0A71A,0x0B693,0x0C22C,0x0D3A5,0x0E13E,0x0F0B7, |
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0x00840,0x019C9,0x02B52,0x03ADB,0x04E64,0x05FED,0x06D76,0x07CFF, |
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0x09489,0x08500,0x0B79B,0x0A612,0x0D2AD,0x0C324,0x0F1BF,0x0E036, |
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0x018C1,0x00948,0x03BD3,0x02A5A,0x05EE5,0x04F6C,0x07DF7,0x06C7E, |
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0x0A50A,0x0B483,0x08618,0x09791,0x0E32E,0x0F2A7,0x0C03C,0x0D1B5, |
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0x02942,0x038CB,0x00A50,0x01BD9,0x06F66,0x07EEF,0x04C74,0x05DFD, |
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0x0B58B,0x0A402,0x09699,0x08710,0x0F3AF,0x0E226,0x0D0BD,0x0C134, |
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0x039C3,0x0284A,0x01AD1,0x00B58,0x07FE7,0x06E6E,0x05CF5,0x04D7C, |
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0x0C60C,0x0D785,0x0E51E,0x0F497,0x08028,0x091A1,0x0A33A,0x0B2B3, |
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0x04A44,0x05BCD,0x06956,0x078DF,0x00C60,0x01DE9,0x02F72,0x03EFB, |
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0x0D68D,0x0C704,0x0F59F,0x0E416,0x090A9,0x08120,0x0B3BB,0x0A232, |
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0x05AC5,0x04B4C,0x079D7,0x0685E,0x01CE1,0x00D68,0x03FF3,0x02E7A, |
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0x0E70E,0x0F687,0x0C41C,0x0D595,0x0A12A,0x0B0A3,0x08238,0x093B1, |
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0x06B46,0x07ACF,0x04854,0x059DD,0x02D62,0x03CEB,0x00E70,0x01FF9, |
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0x0F78F,0x0E606,0x0D49D,0x0C514,0x0B1AB,0x0A022,0x092B9,0x08330, |
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0x07BC7,0x06A4E,0x058D5,0x0495C,0x03DE3,0x02C6A,0x01EF1,0x00F78, |
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}; |
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register uint16_t crc(0xffff); |
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|
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while (length--) |
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crc = (crc >> 8) ^ table[(crc ^ *buffer++) & 0xff]; |
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|
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return ~crc; |
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} |
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|
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Display::Packet::Packet(Display::Packet::Command command, const std::string &data) : command(command), length(data.size()) |
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{ |
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if (length > sizeof (this->data)) |
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throw; |
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|
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::memcpy(this->data, data.data(), length); |
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|
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crc = GetCRC(reinterpret_cast<uint8_t *>(this), length + 2); |
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} |
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|
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void operator<<(int fd, const Display::Packet::Packet &packet) |
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{ |
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if (packet.length != sizeof (packet.data)) |
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::memcpy(const_cast<uint8_t *>(packet.data) + packet.length, &packet.crc, 2); |
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|
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Posix::Write(fd, &packet, packet.length + 4); |
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} |
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|
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void operator>>(int fd, Display::Packet::Packet &packet) |
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{ |
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Posix::Read(fd, &packet, 2); |
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Posix::Read(fd, packet.data, packet.length); |
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Posix::Read(fd, &packet.crc, 2); |
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|
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std::printf("0x%02x\n%i\n", packet.command, packet.length); |
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|
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std::cout << '[' << std::string((char*)(packet.data), size_t(packet.length)) << ']' << std::endl; |
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} |
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|
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Display::Display(const std::string &device) : ucom(Posix::Open(device, O_RDWR | O_NOCTTY)) |
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{ |
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::termios state; |
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|
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Posix::CheckError(::tcgetattr(ucom, &state)); |
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Posix::CheckError(::cfsetospeed(&state, B115200)); |
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Posix::CheckError(::cfsetispeed(&state, B115200)); |
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|
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state.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXOFF); |
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state.c_iflag |= IGNPAR; |
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state.c_oflag &= ~(OPOST | ONLCR | ONOCR | ONLRET); |
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state.c_cflag &= ~(CSIZE | PARENB | PARODD | HUPCL | CRTSCTS); |
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state.c_cflag |= CREAD | CS8 | CSTOPB | CLOCAL; |
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state.c_lflag &= ~(ISIG | ICANON | IEXTEN | ECHO); |
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state.c_lflag |= NOFLSH; |
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|
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Posix::CheckError(::tcsetattr(ucom, TCSANOW, &state)); |
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} |
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|
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bool Display::Ping(const std::string &data) |
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{ |
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Packet packet(Packet::PingCommand, data), response; |
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|
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ucom << packet; |
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|
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do |
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{ |
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ucom >> response; |
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} |
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while (packet.command | Packet::Response != response.command); |
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|
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return true; |
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} |
