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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 140 | johboh | 1 | /********************************************************************* |
| 2 | * |
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| 3 | * LCD routines (HD44780) |
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| 4 | * |
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| 5 | ********************************************************************* |
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| 6 | * FileName: $HeadURL: https://svn.auml.se/svn/HomeAutomation/trunk/EmbeddedSoftware/PIC/canLCD/Source/lcd.c $ |
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| 7 | * Last changed: $LastChangedDate: 2006-11-21 10:28:39 +0100 (Tue, 21 Nov 2006) $ |
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| 8 | * By: $LastChangedBy: johboh $ |
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| 9 | * Revision: $Revision: 140 $ |
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| 10 | ********************************************************************/ |
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| 11 | |||
| 12 | #include <lcd.h> |
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| 13 | |||
| 14 | #ifdef USE_LCD |
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| 15 | |||
| 16 | static void lcdWrite(BYTE c); |
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| 17 | |||
| 18 | #define LCD_STROBE ((LCD_EN_IO = 1),(LCD_EN_IO = 0)) |
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| 19 | |||
| 20 | /* |
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| 21 | OBS OBS OBS OBS!! |
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| 22 | |||
| 23 | DELAYS ARE FOR 40Mhz (10Mhz PLL4) |
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| 24 | |||
| 25 | Definitions needed: |
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| 26 | |||
| 27 | LCD_RS_TRIS and LCD_RS_IO |
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| 28 | LCD_EN_TRIS and LCD_EN_IO |
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| 29 | LCD_DATA_4_TRIS and LCD_DATA_4_IO |
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| 30 | LCD_DATA_5_TRIS and LCD_DATA_5_IO |
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| 31 | LCD_DATA_6_TRIS and LCD_DATA_6_IO |
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| 32 | LCD_DATA_7_TRIS and LCD_DATA_7_IO |
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| 33 | |||
| 34 | |||
| 35 | |||
| 36 | */ |
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| 37 | |||
| 38 | /* |
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| 39 | * Function: lcdWrite |
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| 40 | * |
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| 41 | * Input: Byte to write. |
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| 42 | * Output: none |
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| 43 | * Pre-conditions: none |
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| 44 | * Affects: Write to the dislay |
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| 45 | * Depends: none. |
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| 46 | */ |
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| 47 | void lcdWrite(BYTE c) |
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| 48 | { |
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| 49 | LCD_DATA_4_IO=((c)&0b10000)>>4; |
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| 50 | LCD_DATA_5_IO=((c)&0b100000)>>5; |
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| 51 | LCD_DATA_6_IO=((c)&0b1000000)>>6; |
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| 52 | LCD_DATA_7_IO=((c)&0b10000000)>>7; |
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| 53 | LCD_STROBE; |
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| 54 | LCD_DATA_4_IO=((c)&0b1); |
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| 55 | LCD_DATA_5_IO=((c)&0b10)>>1; |
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| 56 | LCD_DATA_6_IO=((c)&0b100)>>2; |
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| 57 | LCD_DATA_7_IO=((c)&0b1000)>>3; |
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| 58 | LCD_STROBE; |
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| 59 | Delay100TCYx(8); // 80uS |
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| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | /* |
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| 64 | * Function: lcdClear |
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| 65 | * |
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| 66 | * Input: none. |
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| 67 | * Output: none |
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| 68 | * Pre-conditions: none |
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| 69 | * Affects: Clear the display |
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| 70 | * Depends: none. |
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| 71 | */ |
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| 72 | void lcdClear(void) |
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| 73 | { |
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| 74 | LCD_RS_IO = 0; |
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| 75 | lcdWrite(0x1); // Clear the Display |
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| 76 | Delay10KTCYx(2); // 2ms |
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| 77 | lcdWrite(0x02); // Home the display |
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| 78 | Delay10KTCYx(2); // 2ms |
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| 79 | } |
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| 80 | |||
| 81 | /* |
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| 82 | * Function: lcdPuts |
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| 83 | * |
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| 84 | * Input: string to write. |
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| 85 | * Output: none |
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| 86 | * Pre-conditions: none |
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| 87 | * Affects: none. |
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| 88 | * Depends: none. |
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| 89 | */ |
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| 90 | void lcdPuts(char * s) |
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| 91 | { |
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| 92 | LCD_RS_IO = 1; // write characters |
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| 93 | while(*s) lcdWrite(*s++); |
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| 94 | } |
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| 95 | |||
| 96 | /* |
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| 97 | * Function: lcdPutrs |
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| 98 | * |
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| 99 | * Input: string to write. |
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| 100 | * Output: none |
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| 101 | * Pre-conditions: none |
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| 102 | * Affects: none. |
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| 103 | * Depends: none. |
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| 104 | */ |
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| 105 | void lcdPutrs(const rom char *s) |
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| 106 | { |
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| 107 | LCD_RS_IO = 1; // write characters |
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| 108 | while(*s) lcdWrite(*s++); |
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| 109 | } |
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| 110 | |||
| 111 | /* |
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| 112 | * Function: lcdPutc |
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| 113 | * |
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| 114 | * Input: char to write. |
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| 115 | * Output: none |
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| 116 | * Pre-conditions: none |
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| 117 | * Affects: none. |
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| 118 | * Depends: none. |
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| 119 | */ |
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| 120 | void lcdPutc(char c) |
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| 121 | { |
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| 122 | LCD_RS_IO=1; // write character |
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| 123 | lcdWrite(c); |
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| 124 | } |
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| 125 | |||
| 126 | |||
| 127 | |||
| 128 | /* |
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| 129 | * Function: lcdGoto |
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| 130 | * |
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| 131 | * Input: Position to goto |
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| 132 | * Output: none |
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| 133 | * Pre-conditions: none |
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| 134 | * Affects: none. |
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| 135 | * Depends: none. |
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| 136 | */ |
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| 137 | void lcdGoto(BYTE pos) |
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| 138 | { |
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| 139 | LCD_RS_IO = 0; |
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| 140 | lcdWrite(0x80+pos); // sets the DDRAM Address |
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| 141 | } |
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| 142 | |||
| 143 | |||
| 144 | /* |
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| 145 | * Function: lcdInit |
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| 146 | * |
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| 147 | * Input: none. |
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| 148 | * Output: none |
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| 149 | * Pre-conditions: none |
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| 150 | * Affects: none. |
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| 151 | * Depends: Setup to use 4 bit mode |
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| 152 | */ |
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| 153 | void lcdInit(void) |
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| 154 | { |
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| 155 | // Setup IO (all output) |
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| 156 | LCD_RS_TRIS = 0; |
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| 157 | LCD_EN_TRIS = 0; |
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| 158 | LCD_DATA_4_TRIS = 0; |
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| 159 | LCD_DATA_5_TRIS = 0; |
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| 160 | LCD_DATA_6_TRIS = 0; |
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| 161 | LCD_DATA_7_TRIS = 0; |
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| 162 | |||
| 163 | LCD_RS_IO = 0; // write control bytes |
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| 164 | Delay10KTCYx(15); // power on delay, 15ms |
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| 165 | lcdWrite(0x3); // attention! |
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| 166 | Delay10KTCYx(5); // 5ms |
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| 167 | LCD_STROBE; |
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| 168 | Delay100TCYx(10); // 100us |
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| 169 | LCD_STROBE; |
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| 170 | Delay10KTCYx(5); // 5ms |
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| 171 | lcdWrite(0x2); // set 4 bit mode |
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| 172 | Delay100TCYx(4); // 40 us |
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| 173 | lcdWrite(0x28); // 4 bit mode, 1/16 duty, 5x8 font |
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| 174 | lcdWrite(0x08); // display off |
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| 175 | lcdWrite(0x0C); // display on, unblink curson off |
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| 176 | lcdWrite(0x06); // entry mode |
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| 177 | } |
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| 178 | |||
| 179 | |||
| 180 | |||
| 181 | |||
| 182 | |||
| 183 | |||
| 184 | #endif |
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| 185 |