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#include "gLCD.h"
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2
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#include "mbed.h"
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gLCD::gLCD(PinName rst, PinName rs, PinName e, PinName d0, PinName d1,
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PinName d2, PinName d3, PinName d4, PinName d5, PinName d6, PinName d7, PinName led)
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: _rst(rst), _rs(rs), _e(e), _d(d0, d1, d2, d3, d4, d5, d6, d7), _led(led){
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_rst = 0; // Put display driver into Reset mode
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_e = 1;
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10
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_rs = 0; // Put display controller in command mode
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11
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wait(0.015); // Wait 15ms to ensure powered up
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13
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_rst = 1; // Switch reset off
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15
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16
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17
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/* ADC Select
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18
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Horizontal direction
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19
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0xA0 = SEG1->SEG132 (left to right)
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20
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0xA1 = SEG132->SEG1 (right to left) */
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writeCommand(0xA0); // 0xA0 = SEG1->SEG132 (left to right)
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22
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23
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/* SHL Select
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24
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Vertical direction
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25
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0xC0 = COM1->COM64 (top to bottom)
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26
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0xC8 = COM64->COM1 (bottom to top) */
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27
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writeCommand(0xC0); // 0xC0 = COM1->COM64
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28
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/* LCD bias select
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30
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Screen in use: Displaytech 64128E
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Display duty ratio: 1/65
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32
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Display bias: 1/9
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33
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0xA2 = 1/5 or 1/6 or 1/7 bias
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34
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0xA3 = 1/6 or 1/8 or 1/9 bias
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35
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Note: at 1/6 bias use 0xA2 for 1/49 duty ratio
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or 0xA3 for 1/33 duty ratio */
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writeCommand(0xA3); // 0xA3 = 1/9 bias
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38
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39
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/*Power control
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40
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Displaytech screen uses built-in power circuits
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41
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Switch on in order as specified in data sheet
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42
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wait 1ms between each command
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1st - Voltage converter ON = 0x2C
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44
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2nd - Voltage regulator ON = 0x2E
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45
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3rd - Voltage follower ON = 0x2F */
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46
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writeCommand(0x2C); //0x2C = Voltage converter ON
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47
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wait(0.001);
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writeCommand(0x2E); //0x2E = Voltage regulator ON
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49
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wait(0.001);
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50
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writeCommand(0x2F); //0x2F = Voltage follower ON
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51
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52
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/*Regulator resistor select
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53
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Sets the internal resistance ratio used in the internal voltage regulator
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54
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Refer to datasheet p.42
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55
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This works as a corse contrast control
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56
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0x20 = 1.9
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57
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0x21 = 2.19
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58
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0x22 = 2.55
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59
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0x23 = 3.02
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60
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0x24 = 3.61
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61
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0x25 = 4.35
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62
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0x26 = 5.29
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63
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0x27 = 6.48 */
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64
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writeCommand(0x26);
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65
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66
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/*Set reference voltage register
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67
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Used as a fine contrast control
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68
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0x81 = Enter voltage register set mode
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69
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0x00 to 0x3F = 0 to 63 */
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70
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writeCommand(0x81); //0x81 = Enter voltage register set mode
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71
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writeCommand(0x46); //0x30 = Set ref voltage to 30
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72
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73
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/*Initial display line
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74
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Specify DDRAM line for COM1
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75
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0x40 + display line */
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76
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writeCommand(0x40); //Set initial line to 0
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77
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78
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/*Set page address
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79
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Sets the initial page address to write to
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80
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0xB0 + page address 0 to 8 */
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81
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writeCommand(0xB0); //Initial page set to 0
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82
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83
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/*Set column address
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84
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Sets the initial column to write to
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85
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for LSB (b3-b0) 0x00 + first nibble
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86
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for MSB (b7-b4) 0x10 + second nibble
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87
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0x00 to 0x83 = column 0 to 131 */
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88
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writeCommand(0x00); //Sets LSB to 0
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89
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writeCommand(0x10); //Sets MSB to 0 - column is now set to 0
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90
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91
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/*Reverse display
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92
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Selects either a normal display or a reverse display
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93
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0xA6 = normal
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94
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0xA7 = reverse */
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95
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writeCommand(0xA6); //Sets display to normal
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96
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97
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/*Set static indicator
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98
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Sets up a static indicator on the display
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99
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See datasheet p.42
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100
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This is a 2 instruction cycle
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101
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0xAC = static indicator ON
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102
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0xAD = static indicator OFF
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103
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Next instruction to set indicator type:
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104
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0x00 = OFF
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105
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0x01 = ON - 1 second blinking
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106
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0x02 = ON - 0.5 second blinking
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107
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0x03 = ON - always ON */
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108
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writeCommand(0xAD); //Static indicator OFF
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109
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writeCommand(0x00); //OFF - 0.5 second blinking
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110
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111
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/*Display ON/OFF
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112
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Switched the display to on or off
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113
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0xAE = Display OFF
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114
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0xAF = Display ON */
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115
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writeCommand(0xAF);
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116
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117
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118
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119
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120
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121
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122
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}
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123
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124
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125
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126
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void gLCD::writeCommand(int command)
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127
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{
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128
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_rs = 0;
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129
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wait(0.000040f);
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130
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writeByte(command);
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131
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}
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132
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133
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void gLCD::writeData(int data)
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134
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{
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135
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_rs = 1;
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136
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writeByte(data);
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137
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}
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138
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139
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void gLCD::writeByte(int value)
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140
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{
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141
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_led = 1;
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142
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_e = 1;
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143
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wait(0.000040f); //Allow time for display
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144
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_d = value;
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145
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wait(0.000040f); //Allow time for display
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146
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_e = 0; //Load value to display - display driver registers on falling edge of e
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147
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_led = 0;
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148
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149
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}
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150
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151
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void gLCD::locate(int page, int column)
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152
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{
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153
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_column = column;
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154
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_page = page;
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155
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writeCommand(0xB0 + page);
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156
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writeCommand(0x00 + (column & 0x0f));
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157
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writeCommand(0x10 + ((column >> 4) & 0x0f));
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0:1cfbf6b8d116
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158
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}
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159
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160
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void gLCD::locateChar(int page, int column)
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161
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{
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162
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column = ((column*6)+1);
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163
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_column = column;
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164
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_page = page;
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165
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writeCommand(0xB0 + page);
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166
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writeCommand(0x00 + (column & 0x0f));
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| tonydbeck |
0:1cfbf6b8d116
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167
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writeCommand(0x10 + ((column >> 4) & 0x0f));
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0:1cfbf6b8d116
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168
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}
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|
169
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170
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void gLCD::clearScreen()
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171
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{
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172
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for(int a = 0; a < 8; a++)
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173
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{
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174
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locate(a,0);
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175
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for(int b = 0; b <128; b++)
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0:1cfbf6b8d116
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176
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{
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0:1cfbf6b8d116
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177
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writeData(0x00);
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178
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}
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0:1cfbf6b8d116
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179
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}
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180
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locate(0,0);
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0:1cfbf6b8d116
|
181
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}
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|
182
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183
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void gLCD::writeChar5x8(int p, int col, int c)
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184
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{
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185
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const int *ptrFont5x8 = font5x8;
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186
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locate(p,col);
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187
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ptrFont5x8+= ((c-32)*6);
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188
|
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0:1cfbf6b8d116
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189
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for(int a=0; a < 6; a++)
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0:1cfbf6b8d116
|
190
|
{
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|
191
|
|
| tonydbeck |
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|
192
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writeData(*ptrFont5x8);
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| tonydbeck |
0:1cfbf6b8d116
|
193
|
|
| tonydbeck |
0:1cfbf6b8d116
|
194
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ptrFont5x8++;
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| tonydbeck |
0:1cfbf6b8d116
|
195
|
}
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| tonydbeck |
0:1cfbf6b8d116
|
196
|
|
| tonydbeck |
0:1cfbf6b8d116
|
197
|
}
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| tonydbeck |
0:1cfbf6b8d116
|
198
|
|
| tonydbeck |
0:1cfbf6b8d116
|
199
|
|
| tonydbeck |
0:1cfbf6b8d116
|
200
|
|
| tonydbeck |
0:1cfbf6b8d116
|
201
|
int gLCD::_putc(int value)
|
| tonydbeck |
0:1cfbf6b8d116
|
202
|
{
|
| tonydbeck |
0:1cfbf6b8d116
|
203
|
|
| tonydbeck |
0:1cfbf6b8d116
|
204
|
|
| tonydbeck |
0:1cfbf6b8d116
|
205
|
|
| tonydbeck |
0:1cfbf6b8d116
|
206
|
writeChar5x8(_page, _column, value);
|
| tonydbeck |
0:1cfbf6b8d116
|
207
|
_column+=6;
|
| tonydbeck |
0:1cfbf6b8d116
|
208
|
|
| tonydbeck |
0:1cfbf6b8d116
|
209
|
|
| tonydbeck |
0:1cfbf6b8d116
|
210
|
return value;
|
| tonydbeck |
0:1cfbf6b8d116
|
211
|
}
|
| tonydbeck |
0:1cfbf6b8d116
|
212
|
|
| tonydbeck |
0:1cfbf6b8d116
|
213
|
int gLCD::_getc() {
|
| tonydbeck |
0:1cfbf6b8d116
|
214
|
return -1;
|
| tonydbeck |
0:1cfbf6b8d116
|
215
|
}
|
| tonydbeck |
0:1cfbf6b8d116
|
216
|
|
| tonydbeck |
0:1cfbf6b8d116
|
217
|
|
| tonydbeck |
0:1cfbf6b8d116
|
218
|
void gLCD::writeBitmap(const int *ptrBitmap)
|
| tonydbeck |
0:1cfbf6b8d116
|
219
|
{
|
| tonydbeck |
0:1cfbf6b8d116
|
220
|
|
| tonydbeck |
0:1cfbf6b8d116
|
221
|
|
| tonydbeck |
0:1cfbf6b8d116
|
222
|
|
| tonydbeck |
0:1cfbf6b8d116
|
223
|
for(int a=0; a < 8; a++)
|
| tonydbeck |
0:1cfbf6b8d116
|
224
|
{
|
| tonydbeck |
0:1cfbf6b8d116
|
225
|
locate(a,0);
|
| tonydbeck |
0:1cfbf6b8d116
|
226
|
|
| tonydbeck |
0:1cfbf6b8d116
|
227
|
for(int b=0; b < 128; b++)
|
| tonydbeck |
0:1cfbf6b8d116
|
228
|
{
|
| tonydbeck |
0:1cfbf6b8d116
|
229
|
writeData(*ptrBitmap);
|
| tonydbeck |
0:1cfbf6b8d116
|
230
|
ptrBitmap+=8;
|
| tonydbeck |
0:1cfbf6b8d116
|
231
|
|
| tonydbeck |
0:1cfbf6b8d116
|
232
|
|
| tonydbeck |
0:1cfbf6b8d116
|
233
|
}
|
| tonydbeck |
0:1cfbf6b8d116
|
234
|
ptrBitmap-=1023;
|
| tonydbeck |
0:1cfbf6b8d116
|
235
|
}
|
| tonydbeck |
0:1cfbf6b8d116
|
236
|
|
| tonydbeck |
0:1cfbf6b8d116
|
237
|
} |
Tony Beck