Line No. | Rev | Author | Line |
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1 | 6 | kaklik | /*! \file lcd.c \brief Character LCD driver for HD44780/SED1278 displays. */ |
2 | //***************************************************************************** |
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3 | // |
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4 | // File Name : 'lcd.c' |
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5 | // Title : Character LCD driver for HD44780/SED1278 displays |
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6 | // (usable in mem-mapped, or I/O mode) |
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7 | // Author : Pascal Stang |
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8 | // Created : 11/22/2000 |
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9 | // Revised : 4/30/2002 |
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10 | // Version : 1.1 |
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11 | // Target MCU : Atmel AVR series |
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12 | // Editor Tabs : 4 |
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13 | // |
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14 | // This code is distributed under the GNU Public License |
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15 | // which can be found at http://www.gnu.org/licenses/gpl.txt |
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16 | // |
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17 | //***************************************************************************** |
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18 | |||
19 | #include <avr/io.h> |
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20 | #include <avr/pgmspace.h> |
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21 | |||
22 | #include "global.h" |
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23 | #include "timer.h" |
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24 | |||
25 | #include "lcd.h" |
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26 | |||
27 | // custom LCD characters |
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28 | unsigned char __attribute__ ((progmem)) LcdCustomChar[] = |
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29 | { |
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30 | 0x00, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, // 0. 0/5 full progress block |
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31 | 0x00, 0x1F, 0x10, 0x10, 0x10, 0x10, 0x1F, 0x00, // 1. 1/5 full progress block |
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32 | 0x00, 0x1F, 0x18, 0x18, 0x18, 0x18, 0x1F, 0x00, // 2. 2/5 full progress block |
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33 | 0x00, 0x1F, 0x1C, 0x1C, 0x1C, 0x1C, 0x1F, 0x00, // 3. 3/5 full progress block |
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34 | 0x00, 0x1F, 0x1E, 0x1E, 0x1E, 0x1E, 0x1F, 0x00, // 4. 4/5 full progress block |
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35 | 0x00, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00, // 5. 5/5 full progress block |
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36 | 0x03, 0x07, 0x0F, 0x1F, 0x0F, 0x07, 0x03, 0x00, // 6. rewind arrow |
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37 | 0x00, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00, // 7. stop block |
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38 | 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x00, // 8. pause bars |
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39 | 0x18, 0x1C, 0x1E, 0x1F, 0x1E, 0x1C, 0x18, 0x00, // 9. fast-forward arrow |
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40 | 0x00, 0x04, 0x04, 0x0E, 0x0E, 0x1F, 0x1F, 0x00, // 10. scroll up arrow |
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41 | 0x00, 0x1F, 0x1F, 0x0E, 0x0E, 0x04, 0x04, 0x00, // 11. scroll down arrow |
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42 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 12. blank character |
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43 | 0x00, 0x0E, 0x19, 0x15, 0x13, 0x0E, 0x00, 0x00, // 13. animated play icon frame 0 |
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44 | 0x00, 0x0E, 0x15, 0x15, 0x15, 0x0E, 0x00, 0x00, // 14. animated play icon frame 1 |
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45 | 0x00, 0x0E, 0x13, 0x15, 0x19, 0x0E, 0x00, 0x00, // 15. animated play icon frame 2 |
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46 | 0x00, 0x0E, 0x11, 0x1F, 0x11, 0x0E, 0x00, 0x00, // 16. animated play icon frame 3 |
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47 | }; |
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48 | |||
49 | /*************************************************************/ |
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50 | /********************** LOCAL FUNCTIONS **********************/ |
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51 | /*************************************************************/ |
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52 | |||
53 | void lcdInitHW(void) |
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54 | { |
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55 | // initialize I/O ports |
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56 | // if I/O interface is in use |
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57 | #ifdef LCD_PORT_INTERFACE |
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58 | // initialize LCD control lines |
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59 | cbi(LCD_CTRL_PORT, LCD_CTRL_RS); |
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60 | cbi(LCD_CTRL_PORT, LCD_CTRL_RW); |
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61 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); |
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62 | // initialize LCD control lines to output |
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63 | sbi(LCD_CTRL_DDR, LCD_CTRL_RS); |
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64 | sbi(LCD_CTRL_DDR, LCD_CTRL_RW); |
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65 | sbi(LCD_CTRL_DDR, LCD_CTRL_E); |
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66 | // initialize LCD data port to input |
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67 | // initialize LCD data lines to pull-up |
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68 | #ifdef LCD_DATA_4BIT |
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69 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) |
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70 | outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit) |
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71 | #else |
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72 | outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit) |
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73 | outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit) |
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74 | #endif |
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75 | #else |
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76 | // enable external memory bus if not already enabled |
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77 | sbi(MCUCR, SRE); // enable bus interface |
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78 | #endif |
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79 | } |
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80 | |||
81 | void lcdBusyWait(void) |
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82 | { |
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83 | // wait until LCD busy bit goes to zero |
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84 | // do a read from control register |
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85 | #ifdef LCD_PORT_INTERFACE |
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86 | cbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control" |
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87 | #ifdef LCD_DATA_4BIT |
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88 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) |
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89 | outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit) |
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90 | #else |
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91 | outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit) |
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92 | outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit) |
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93 | #endif |
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94 | sbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read" |
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95 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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96 | LCD_DELAY; // wait |
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97 | while(inb(LCD_DATA_PIN) & 1<<LCD_BUSY) |
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98 | { |
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99 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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100 | LCD_DELAY; // wait |
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101 | LCD_DELAY; // wait |
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102 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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103 | LCD_DELAY; // wait |
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104 | LCD_DELAY; // wait |
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105 | #ifdef LCD_DATA_4BIT // do an extra clock for 4 bit reads |
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106 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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107 | LCD_DELAY; // wait |
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108 | LCD_DELAY; // wait |
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109 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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110 | LCD_DELAY; // wait |
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111 | LCD_DELAY; // wait |
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112 | #endif |
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113 | } |
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114 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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115 | // leave data lines in input mode so they can be most easily used for other purposes |
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116 | #else |
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117 | // memory bus read |
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118 | // sbi(MCUCR, SRW); // enable RAM waitstate |
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119 | // wait until LCD busy bit goes to zero |
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120 | while( (*((volatile unsigned char *) (LCD_CTRL_ADDR))) & (1<<LCD_BUSY) ); |
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121 | // cbi(MCUCR, SRW); // disable RAM waitstate |
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122 | #endif |
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123 | } |
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124 | |||
125 | void lcdControlWrite(u08 data) |
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126 | { |
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127 | // write the control byte to the display controller |
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128 | #ifdef LCD_PORT_INTERFACE |
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129 | lcdBusyWait(); // wait until LCD not busy |
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130 | cbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control" |
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131 | cbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "write" |
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132 | #ifdef LCD_DATA_4BIT |
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133 | // 4 bit write |
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134 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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135 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)|0xF0); // set data I/O lines to output (4bit) |
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136 | outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&0x0F) | (data&0xF0) ); // output data, high 4 bits |
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137 | LCD_DELAY; // wait |
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138 | LCD_DELAY; // wait |
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139 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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140 | LCD_DELAY; // wait |
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141 | LCD_DELAY; // wait |
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142 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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143 | outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&0x0F) | (data<<4) ); // output data, low 4 bits |
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144 | LCD_DELAY; // wait |
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145 | LCD_DELAY; // wait |
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146 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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147 | #else |
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148 | // 8 bit write |
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149 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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150 | outb(LCD_DATA_DDR, 0xFF); // set data I/O lines to output (8bit) |
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151 | outb(LCD_DATA_POUT, data); // output data, 8bits |
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152 | LCD_DELAY; // wait |
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153 | LCD_DELAY; // wait |
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154 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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155 | #endif |
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156 | // leave data lines in input mode so they can be most easily used for other purposes |
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157 | #ifdef LCD_DATA_4BIT |
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158 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) |
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159 | outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit) |
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160 | #else |
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161 | outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit) |
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162 | outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit) |
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163 | #endif |
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164 | #else |
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165 | // memory bus write |
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166 | //sbi(MCUCR, SRW); // enable RAM waitstate |
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167 | lcdBusyWait(); // wait until LCD not busy |
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168 | *((volatile unsigned char *) (LCD_CTRL_ADDR)) = data; |
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169 | //cbi(MCUCR, SRW); // disable RAM waitstate |
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170 | #endif |
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171 | } |
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172 | |||
173 | u08 lcdControlRead(void) |
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174 | { |
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175 | // read the control byte from the display controller |
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176 | register u08 data; |
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177 | #ifdef LCD_PORT_INTERFACE |
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178 | lcdBusyWait(); // wait until LCD not busy |
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179 | #ifdef LCD_DATA_4BIT |
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180 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) |
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181 | outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit) |
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182 | #else |
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183 | outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit) |
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184 | outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit) |
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185 | #endif |
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186 | cbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control" |
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187 | sbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read" |
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188 | #ifdef LCD_DATA_4BIT |
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189 | // 4 bit read |
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190 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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191 | LCD_DELAY; // wait |
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192 | LCD_DELAY; // wait |
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193 | data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits |
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194 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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195 | LCD_DELAY; // wait |
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196 | LCD_DELAY; // wait |
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197 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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198 | LCD_DELAY; // wait |
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199 | LCD_DELAY; // wait |
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200 | data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits |
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201 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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202 | #else |
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203 | // 8 bit read |
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204 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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205 | LCD_DELAY; // wait |
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206 | LCD_DELAY; // wait |
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207 | data = inb(LCD_DATA_PIN); // input data, 8bits |
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208 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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209 | #endif |
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210 | // leave data lines in input mode so they can be most easily used for other purposes |
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211 | #else |
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212 | //sbi(MCUCR, SRW); // enable RAM waitstate |
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213 | lcdBusyWait(); // wait until LCD not busy |
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214 | data = *((volatile unsigned char *) (LCD_CTRL_ADDR)); |
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215 | //cbi(MCUCR, SRW); // disable RAM waitstate |
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216 | #endif |
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217 | return data; |
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218 | } |
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219 | |||
220 | void lcdDataWrite(u08 data) |
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221 | { |
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222 | // write a data byte to the display |
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223 | #ifdef LCD_PORT_INTERFACE |
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224 | lcdBusyWait(); // wait until LCD not busy |
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225 | sbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "data" |
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226 | cbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "write" |
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227 | #ifdef LCD_DATA_4BIT |
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228 | // 4 bit write |
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229 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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230 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)|0xF0); // set data I/O lines to output (4bit) |
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231 | outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&0x0F) | (data&0xF0) ); // output data, high 4 bits |
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232 | LCD_DELAY; // wait |
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233 | LCD_DELAY; // wait |
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234 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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235 | LCD_DELAY; // wait |
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236 | LCD_DELAY; // wait |
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237 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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238 | outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&0x0F) | (data<<4) ); // output data, low 4 bits |
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239 | LCD_DELAY; // wait |
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240 | LCD_DELAY; // wait |
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241 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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242 | #else |
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243 | // 8 bit write |
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244 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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245 | outb(LCD_DATA_DDR, 0xFF); // set data I/O lines to output (8bit) |
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246 | outb(LCD_DATA_POUT, data); // output data, 8bits |
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247 | LCD_DELAY; // wait |
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248 | LCD_DELAY; // wait |
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249 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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250 | #endif |
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251 | // leave data lines in input mode so they can be most easily used for other purposes |
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252 | #ifdef LCD_DATA_4BIT |
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253 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) |
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254 | outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit) |
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255 | #else |
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256 | outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit) |
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257 | outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit) |
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258 | #endif |
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259 | #else |
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260 | // memory bus write |
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261 | //sbi(MCUCR, SRW); // enable RAM waitstate |
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262 | lcdBusyWait(); // wait until LCD not busy |
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263 | *((volatile unsigned char *) (LCD_DATA_ADDR)) = data; |
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264 | //cbi(MCUCR, SRW); // disable RAM waitstate |
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265 | #endif |
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266 | } |
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267 | |||
268 | u08 lcdDataRead(void) |
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269 | { |
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270 | // read a data byte from the display |
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271 | register u08 data; |
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272 | #ifdef LCD_PORT_INTERFACE |
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273 | lcdBusyWait(); // wait until LCD not busy |
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274 | #ifdef LCD_DATA_4BIT |
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275 | outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) |
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276 | outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0); // set pull-ups to on (4bit) |
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277 | #else |
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278 | outb(LCD_DATA_DDR, 0x00); // set data I/O lines to input (8bit) |
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279 | outb(LCD_DATA_POUT, 0xFF); // set pull-ups to on (8bit) |
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280 | #endif |
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281 | sbi(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "data" |
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282 | sbi(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read" |
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283 | #ifdef LCD_DATA_4BIT |
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284 | // 4 bit read |
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285 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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286 | LCD_DELAY; // wait |
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287 | LCD_DELAY; // wait |
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288 | data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits |
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289 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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290 | LCD_DELAY; // wait |
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291 | LCD_DELAY; // wait |
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292 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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293 | LCD_DELAY; // wait |
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294 | LCD_DELAY; // wait |
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295 | data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits |
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296 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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297 | #else |
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298 | // 8 bit read |
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299 | sbi(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line |
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300 | LCD_DELAY; // wait |
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301 | LCD_DELAY; // wait |
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302 | data = inb(LCD_DATA_PIN); // input data, 8bits |
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303 | cbi(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line |
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304 | #endif |
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305 | // leave data lines in input mode so they can be most easily used for other purposes |
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306 | #else |
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307 | // memory bus read |
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308 | //sbi(MCUCR, SRW); // enable RAM waitstate |
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309 | lcdBusyWait(); // wait until LCD not busy |
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310 | data = *((volatile unsigned char *) (LCD_DATA_ADDR)); |
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311 | //cbi(MCUCR, SRW); // disable RAM waitstate |
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312 | #endif |
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313 | return data; |
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314 | } |
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315 | |||
316 | |||
317 | |||
318 | /*************************************************************/ |
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319 | /********************* PUBLIC FUNCTIONS **********************/ |
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320 | /*************************************************************/ |
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321 | |||
322 | void lcdInit() |
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323 | { |
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324 | // initialize hardware |
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325 | lcdInitHW(); |
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326 | // LCD function set |
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327 | lcdControlWrite(LCD_FUNCTION_DEFAULT); |
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328 | // clear LCD |
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329 | lcdControlWrite(1<<LCD_CLR); |
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330 | delay(60000); // wait 60ms |
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331 | // set entry mode |
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332 | lcdControlWrite(1<<LCD_ENTRY_MODE | 1<<LCD_ENTRY_INC); |
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333 | // set display to on |
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334 | //lcdControlWrite(1<<LCD_ON_CTRL | 1<<LCD_ON_DISPLAY | 1<<LCD_ON_BLINK); |
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335 | lcdControlWrite(1<<LCD_ON_CTRL | 1<<LCD_ON_DISPLAY ); |
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336 | // move cursor to home |
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337 | lcdControlWrite(1<<LCD_HOME); |
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338 | // set data address to 0 |
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339 | lcdControlWrite(1<<LCD_DDRAM | 0x00); |
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340 | |||
341 | // load the first 8 custom characters |
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342 | lcdLoadCustomChar((u08*)LcdCustomChar,0,0); |
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343 | lcdLoadCustomChar((u08*)LcdCustomChar,1,1); |
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344 | lcdLoadCustomChar((u08*)LcdCustomChar,2,2); |
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345 | lcdLoadCustomChar((u08*)LcdCustomChar,3,3); |
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346 | lcdLoadCustomChar((u08*)LcdCustomChar,4,4); |
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347 | lcdLoadCustomChar((u08*)LcdCustomChar,5,5); |
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348 | lcdLoadCustomChar((u08*)LcdCustomChar,6,6); |
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349 | lcdLoadCustomChar((u08*)LcdCustomChar,7,7); |
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350 | } |
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351 | |||
352 | void lcdHome(void) |
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353 | { |
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354 | // move cursor to home |
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355 | lcdControlWrite(1<<LCD_HOME); |
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356 | } |
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357 | |||
358 | void lcdClear(void) |
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359 | { |
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360 | // clear LCD |
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361 | lcdControlWrite(1<<LCD_CLR); |
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362 | } |
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363 | |||
364 | void lcdGotoXY(u08 x, u08 y) |
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365 | { |
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366 | register u08 DDRAMAddr; |
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367 | |||
368 | // remap lines into proper order |
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369 | switch(y) |
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370 | { |
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371 | case 0: DDRAMAddr = LCD_LINE0_DDRAMADDR+x; break; |
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372 | case 1: DDRAMAddr = LCD_LINE1_DDRAMADDR+x; break; |
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373 | case 2: DDRAMAddr = LCD_LINE2_DDRAMADDR+x; break; |
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374 | case 3: DDRAMAddr = LCD_LINE3_DDRAMADDR+x; break; |
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375 | default: DDRAMAddr = LCD_LINE0_DDRAMADDR+x; |
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376 | } |
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377 | |||
378 | // set data address |
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379 | lcdControlWrite(1<<LCD_DDRAM | DDRAMAddr); |
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380 | } |
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381 | |||
382 | void lcdLoadCustomChar(u08* lcdCustomCharArray, u08 romCharNum, u08 lcdCharNum) |
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383 | { |
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384 | register u08 i; |
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385 | u08 saveDDRAMAddr; |
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386 | |||
387 | // backup the current cursor position |
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388 | saveDDRAMAddr = lcdControlRead() & 0x7F; |
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389 | |||
390 | // multiply the character index by 8 |
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391 | lcdCharNum = (lcdCharNum<<3); // each character occupies 8 bytes |
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392 | romCharNum = (romCharNum<<3); // each character occupies 8 bytes |
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393 | |||
394 | // copy the 8 bytes into CG (character generator) RAM |
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395 | for(i=0; i<8; i++) |
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396 | { |
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397 | // set CG RAM address |
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398 | lcdControlWrite((1<<LCD_CGRAM) | (lcdCharNum+i)); |
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399 | // write character data |
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400 | lcdDataWrite( pgm_read_byte(lcdCustomCharArray+romCharNum+i) ); |
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401 | } |
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402 | |||
403 | // restore the previous cursor position |
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404 | lcdControlWrite(1<<LCD_DDRAM | saveDDRAMAddr); |
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405 | |||
406 | } |
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407 | |||
408 | void lcdPrintData(char* data, u08 nBytes) |
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409 | { |
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410 | register u08 i; |
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411 | |||
412 | // check to make sure we have a good pointer |
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413 | if (!data) return; |
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414 | |||
415 | // print data |
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416 | for(i=0; i<nBytes; i++) |
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417 | { |
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418 | lcdDataWrite(data[i]); |
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419 | } |
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420 | } |
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421 | |||
422 | void lcdProgressBar(u16 progress, u16 maxprogress, u08 length) |
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423 | { |
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424 | u08 i; |
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425 | u32 pixelprogress; |
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426 | u08 c; |
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427 | |||
428 | // draw a progress bar displaying (progress / maxprogress) |
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429 | // starting from the current cursor position |
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430 | // with a total length of "length" characters |
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431 | // ***note, LCD chars 0-5 must be programmed as the bar characters |
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432 | // char 0 = empty ... char 5 = full |
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433 | |||
434 | // total pixel length of bargraph equals length*PROGRESSPIXELS_PER_CHAR; |
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435 | // pixel length of bar itself is |
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436 | pixelprogress = ((progress*(length*PROGRESSPIXELS_PER_CHAR))/maxprogress); |
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437 | |||
438 | // print exactly "length" characters |
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439 | for(i=0; i<length; i++) |
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440 | { |
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441 | // check if this is a full block, or partial or empty |
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442 | // (u16) cast is needed to avoid sign comparison warning |
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443 | if( ((i*(u16)PROGRESSPIXELS_PER_CHAR)+5) > pixelprogress ) |
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444 | { |
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445 | // this is a partial or empty block |
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446 | if( ((i*(u16)PROGRESSPIXELS_PER_CHAR)) > pixelprogress ) |
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447 | { |
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448 | // this is an empty block |
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449 | // use space character? |
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450 | c = 0; |
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451 | } |
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452 | else |
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453 | { |
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454 | // this is a partial block |
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455 | c = pixelprogress % PROGRESSPIXELS_PER_CHAR; |
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456 | } |
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457 | } |
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458 | else |
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459 | { |
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460 | // this is a full block |
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461 | c = 5; |
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462 | } |
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463 | |||
464 | // write character to display |
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465 | lcdDataWrite(c); |
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466 | } |
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467 | |||
468 | } |
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469 |
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