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| simon |
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/* mbed Embedded Artists QVGA LCD Display Library
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* Copyright (c) 2007-2009 sford
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* Released under the MIT License: http://mbed.org/license/mit
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*/
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#include "EA_QVGALCD.h"
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7
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EA_QVGALCD::EA_QVGALCD(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName rst) : _spi(mosi, miso, sclk), _cs(cs), _rst(rst) {
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9
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10
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_spi.frequency(15000000);
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_spi.format(9);
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_cs = 1;
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_rst = 0;
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wait(0.001);
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_rst = 1;
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wait(0.001);
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// 3-wire SPI Format (see 7.1 c)
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// =================
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//
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// The 3-wire spi format uses 9-bit messages of the form:
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//
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// [Data/nControl D7 D6 D5 D4 D3 D2 D1 D0]
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// (first) (last)
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25
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//
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// Most commands and data are 16-bit, so are achieved by sending two
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// command messages, [ CommandMSB | CommandLSB ], or two data messages
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// [ DataMSB | DataLSB ].
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//
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// Controlling the Display
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// =======================
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//
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// The Index Register is used to setup which configuration register is
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// modified. This address is changed by sending a command message:
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//
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// command [ 0 | index[7:0] ]
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//
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// The data that follows update the register.
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//
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//
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// 0x07 - Display Control
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// ======================
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//
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44
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// [ 0 0 0 PT1 PT0 VLE2 VLE1 SPT | 0 0 GON DTE CM 0 D1 D0 ]
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45
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// where:
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46
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// PT[1:0] - ? (0)
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47
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// VLE[2:1] - ? (0)
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48
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// SPT - ? (0)
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49
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// CM - 8 colour mode enable
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50
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// GON - 0 = Gate-off level VGH
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51
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// DTE - 0 = All gate outputs become VGL
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52
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// 1 = Selected gate outputs become VGH
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53
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// D[1:0] - D1 = Display enable
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54
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// D0 = Display operating
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55
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56
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// 15.5 On Sequence
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57
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//
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// -> Set R07h: GON =1, DTE = 0, D[1:0] = 01
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_cs = 0;
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60
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config(0x7
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, 1 << 5 // GON
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62
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| 0 << 4 // DTE
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63
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| 0 << 3 // CM
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64
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| 1 << 0 // D[1:0] = 01 - operate, but disp off
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);
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66
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// -> Set R00h to 0001h
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67
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// R00h [ 00000000 | 0000000 OSCEN ]
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68
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// OSCEN - 1 = oscillator enabled
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69
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config(0x0, 1);
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71
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72
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// -> Set R07h: GON = 1, DTE = 0, D[1:0] = 11
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config(0x7
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, 1 << 5 // GON
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76
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| 1 << 4 // DTE
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77
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| 0 << 3 // CM
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78
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| 3 << 0 // D[1:0] = 3 - operate, display on
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);
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80
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81
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// -> Set R10h at 0000h : Exit sleep mode
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82
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// R10h [ 00000000 | 0000000 SLP ]
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83
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// SLP = enter sleep mode (retain but no function)
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84
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85
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config(0x10, 0);
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86
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87
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// -> wait 30ms
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wait(0.030);
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89
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90
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// -> LCD driver AC setting (R02h)
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91
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config(0x02, 0x0600);
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92
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config(0x01, 0x2b3f); // 1011
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93
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config(0x25, 0xa000); // 70Hz freq
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94
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95
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// -> Entry Mode setting (R11h)
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96
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// R11h [ VSMode DFM1 DFM0 TRANS OEDef WMode DMode1 DMode0 | TY1 TY0 ID1 ID0 AM LG2 LG1 LG0 ]
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97
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// VSMode = freq dependant on VSYNC
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98
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// DFM[1:0] colour display mode 11 - 65k, 10 - 262k
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99
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// TRANS - allow transparent display
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100
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// OEDef:
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101
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// When OEDef = 1, OE defines the display window.
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102
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// When OEDef = 0, the display window is defined by R4Eh and R4Fh.
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103
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// WMode: Select the source of data to write in the RAM.
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104
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// 0 Normal data bus (POR)
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105
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// 1 Generic interface
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106
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// Dmode - where to show from (0 = ram)
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107
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// TY - 262k mode options
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108
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// ID[1:0] [ VERTICAL HORIZONTAL ] increment = 1 decrement = 0
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109
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// AM - 0 = horizontal display, 1 = vertical
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110
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// LG - do maths n written data
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111
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112
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config(0x11
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113
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, 0 << 15 // VSMode
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114
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| 3 << 13 // DFM[1:0]
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115
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| 0 << 12 // TRANS
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116
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| 1 << 11 // OEDef
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117
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| 0 << 10 // WMode
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118
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| 0 << 8 // DMode[1:0]
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119
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| 0 << 6 // TY[1:0]
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120
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| 3 << 4 // ID[1:0]
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121
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| 0 << 3 // AM
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122
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| 0 << 0 // LG[2:0]
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123
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);
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124
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_cs = 1;
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125
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126
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cls();
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127
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}
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128
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129
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void EA_QVGALCD::pixel(int x, int y, int colour) {
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130
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window(x, y, 1, 1);
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131
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putp(colour);
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132
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}
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133
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134
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int EA_QVGALCD::width() { return 240; }
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135
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int EA_QVGALCD::height() { return 320; }
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136
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137
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138
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void EA_QVGALCD::command(int value) {
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139
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_spi.write(value & 0xFF);
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140
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}
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141
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142
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void EA_QVGALCD::data(int value) {
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143
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_spi.write(value | 0x100);
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144
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}
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145
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146
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void EA_QVGALCD::config(int index, int value) {
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| simon |
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147
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command(0);
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148
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command(index);
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149
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data(value >> 8);
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150
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data(value);
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0:cc002f2fad97
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151
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}
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0:cc002f2fad97
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152
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| simon |
0:cc002f2fad97
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153
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154
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void EA_QVGALCD::window(int x, int y, int w, int h) {
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0:cc002f2fad97
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155
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_cs = 0;
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| simon |
0:cc002f2fad97
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156
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| simon |
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157
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int hstart = x;
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| simon |
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158
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int hend = x + w - 1;
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| simon |
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159
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int vstart = y;
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160
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int vend = y + h - 1;
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| simon |
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161
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config(0x44, (hend << 8) | hstart);
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| simon |
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162
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config(0x45, vstart);
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| simon |
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163
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config(0x46, vend);
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164
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165
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config(0x4E, hstart & 0xFF);
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| simon |
0:cc002f2fad97
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166
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config(0x4F, vstart & 0x1FF);
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| simon |
0:cc002f2fad97
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167
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command(0);
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| simon |
0:cc002f2fad97
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168
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command(0x22);
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| simon |
0:cc002f2fad97
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169
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| simon |
0:cc002f2fad97
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170
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_cs = 1;
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0:cc002f2fad97
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171
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}
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| simon |
0:cc002f2fad97
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172
|
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| simon |
0:cc002f2fad97
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173
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void EA_QVGALCD::putp(int colour) {
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| simon |
0:cc002f2fad97
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174
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_cs = 0;
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| simon |
0:cc002f2fad97
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175
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int top = ((colour >> (8+8)) & 0xF8) // r7-3
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176
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| ((colour >> (5+8)) & 0x07); // g7-5
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| simon |
0:cc002f2fad97
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177
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int bottom = ((colour >> 5) & 0xE0) // g4-2
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0:cc002f2fad97
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178
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| ((colour >> 3) & 0x1F); // b7-3
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| simon |
0:cc002f2fad97
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179
|
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| simon |
0:cc002f2fad97
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180
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data(top);
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| simon |
0:cc002f2fad97
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181
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data(bottom);
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| simon |
0:cc002f2fad97
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182
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_cs = 1;
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0:cc002f2fad97
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183
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}
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0:cc002f2fad97
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184
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Simon Ford