Sun, 10 Aug 2014 14:45:11 +0200
Added GLOBAL GET and GLOBAL PUT commands.
103
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1 | /* |
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2 | * lcd-pcf8574.c: |
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3 | * Text-based LCD driver library code |
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4 | * This is designed to drive the HD44780U LCD display connected via |
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5 | * a "LCM1602 IIC A0 A1 A2" board with a PCF8574 I2C controller. |
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6 | * |
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7 | * Copyright (c) 2012-2013 Gordon Henderson. |
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8 | * Copyright (c) 2014 Michiel Broek. |
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9 | *********************************************************************** |
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10 | * |
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11 | * mbsePi is free software: you can redistribute it and/or modify |
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12 | * it under the terms of the GNU Lesser General Public License as published by |
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13 | * the Free Software Foundation, either version 3 of the License, or |
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14 | * (at your option) any later version. |
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15 | * |
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16 | * mbsePi is distributed in the hope that it will be useful, |
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 | * GNU Lesser General Public License for more details. |
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20 | * |
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21 | * You should have received a copy of the GNU Lesser General Public License |
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22 | * along with wiringPi. If not, see <http://www.gnu.org/licenses/>. |
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23 | *********************************************************************** |
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24 | */ |
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25 | |
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26 | #include "mash.h" |
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27 | #include "lcd-pcf8574.h" |
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28 | |
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29 | |
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30 | #ifdef HAVE_WIRINGPI_H |
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31 | |
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32 | int lcdHandle; |
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33 | unsigned char lcdbuf[MAX_LCDS][20][4]; |
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34 | |
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35 | struct lcdDataStruct |
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36 | { |
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37 | int bits, rows, cols ; |
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38 | int rsPin, strbPin ; |
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39 | int dataPins [8] ; |
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40 | int cx, cy ; |
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41 | }; |
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42 | extern struct lcdDataStruct *lcds [MAX_LCDS]; |
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43 | |
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44 | |
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45 | /* |
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46 | * Some LCD functions are extended shadow copies of the wiringPi functions. |
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47 | * The difference is that the lcdbuf will be updated with the contents on |
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48 | * the hardware display. This copy can then be used for a remote display |
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49 | */ |
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50 | |
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51 | |
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52 | /* |
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53 | * setBacklight: |
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54 | ********************************************************************************* |
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55 | */ |
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56 | |
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57 | void setBacklight (int value) |
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58 | { |
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59 | pinMode (AF_BACKLIGHT, OUTPUT) ; |
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60 | digitalWrite (AF_BACKLIGHT, (value & 1)) ; |
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61 | } |
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62 | |
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63 | |
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64 | |
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65 | /* |
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66 | * initLCD: |
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67 | ********************************************************************************* |
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68 | */ |
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69 | |
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70 | int initLCD (int cols, int rows) |
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71 | { |
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72 | int x, y; |
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73 | |
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74 | if (!((rows == 1) || (rows == 2) || (rows == 4))) { |
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75 | fprintf (stderr, "rows must be 1, 2 or 4\n") ; |
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76 | return EXIT_FAILURE ; |
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77 | } |
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78 | |
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79 | if (!((cols == 16) || (cols == 20))) { |
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80 | fprintf (stderr, "cols must be 16 or 20\n") ; |
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81 | return EXIT_FAILURE ; |
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82 | } |
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83 | |
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84 | pcf8574Setup(AF_BASE, 0x27) ; |
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85 | pinMode (AF_RW, OUTPUT) ; |
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86 | digitalWrite (AF_RW, LOW) ; // Not used with wiringPi - always in write mode |
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87 | |
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88 | /* |
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89 | * The other control pins are initialised with lcdInit () |
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90 | */ |
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91 | lcdHandle = lcdInit (rows, cols, 4, AF_RS, AF_E, AF_DB4, AF_DB5, AF_DB6, AF_DB7, 0, 0, 0, 0) ; |
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92 | if (lcdHandle < 0) { |
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93 | fprintf (stderr, "lcdInit failed\n") ; |
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94 | return -1 ; |
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95 | } |
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96 | |
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97 | lcdClear (lcdHandle) ; |
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98 | for (x = 0; x < 20; x++) |
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99 | for (y = 0; y < 4; y++) |
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100 | lcdbuf[lcdHandle][x][y] = ' '; |
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101 | |
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102 | setBacklight (1) ; |
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103 | |
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104 | return 0 ; |
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105 | } |
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106 | |
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107 | |
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108 | |
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109 | void mb_lcdPutchar(const int fd, unsigned char data) |
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110 | { |
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111 | struct lcdDataStruct *lcd = lcds[fd]; |
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112 | |
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113 | /* |
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114 | * Write to our buffer first, then to the wiringPi driver. |
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115 | * Writing to wiringPi updates the cursor position. |
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116 | */ |
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117 | lcdbuf[fd][lcd->cx][lcd->cy] = data; |
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118 | lcdPutchar(fd, data); |
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119 | } |
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120 | |
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121 | |
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122 | |
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123 | void mb_lcdPuts(const int fd, const char *string) |
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124 | { |
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125 | while (*string) |
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126 | mb_lcdPutchar (fd, *string++); |
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127 | } |
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128 | |
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129 | |
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130 | |
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131 | void mb_lcdClear(const int fd) |
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132 | { |
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133 | int x, y; |
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134 | |
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135 | lcdClear(fd); |
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136 | for (x = 0; x < 20; x++) |
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137 | for (y = 0; y < 4; y++) |
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138 | lcdbuf[fd][x][y] = ' '; |
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139 | } |
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140 | |
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141 | |
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142 | |
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143 | #endif |
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144 |