General purpose character LCD library. I found the TextLCD library had too many constraints and it didn\\\\\\\'t supply acces to all functions in the HD44780 chipset, so i decided to write my own character lcd library.
charLcd.cpp@1:1349bedd5793, 2011-03-25 (annotated)
- Committer:
- lktromp
- Date:
- Fri Mar 25 10:01:28 2011 +0000
- Revision:
- 1:1349bedd5793
- Child:
- 2:18f6402fd025
Improved
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
lktromp | 1:1349bedd5793 | 1 | #include "mbed.h" |
lktromp | 1:1349bedd5793 | 2 | #include "charLcd.h" |
lktromp | 1:1349bedd5793 | 3 | #include "hd44780.h" |
lktromp | 1:1349bedd5793 | 4 | #include "main.h" |
lktromp | 1:1349bedd5793 | 5 | Serial pc(USBTX, USBRX); |
lktromp | 1:1349bedd5793 | 6 | #define DEBUG |
lktromp | 1:1349bedd5793 | 7 | |
lktromp | 1:1349bedd5793 | 8 | //constructor for 4-bit lcd control |
lktromp | 1:1349bedd5793 | 9 | charLcd::charLcd(PinName rs, PinName en, PinName rw, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type) |
lktromp | 1:1349bedd5793 | 10 | : cl_rs(rs), cl_rw(rw), cl_en(en), cl_charLcdData(d7, d6, d5, d4) { |
lktromp | 1:1349bedd5793 | 11 | pc.baud(115200); |
lktromp | 1:1349bedd5793 | 12 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 13 | pc.printf("LCD 4bit init\r\n"); |
lktromp | 1:1349bedd5793 | 14 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 15 | charLcdResetLCD(); |
lktromp | 1:1349bedd5793 | 16 | } |
lktromp | 1:1349bedd5793 | 17 | |
lktromp | 1:1349bedd5793 | 18 | //constructor for 8-bit lcd control |
lktromp | 1:1349bedd5793 | 19 | charLcd::charLcd(PinName rs, PinName en, PinName rw, PinName d0, PinName d1, PinName d2, PinName d3, PinName d4, PinName d5, |
lktromp | 1:1349bedd5793 | 20 | PinName d6, PinName d7, LCDType type) |
lktromp | 1:1349bedd5793 | 21 | : cl_rs(rs), cl_rw(rw), cl_en(en), cl_charLcdData(d7, d6, d5, d4, d3, d2, d1, d0) { |
lktromp | 1:1349bedd5793 | 22 | |
lktromp | 1:1349bedd5793 | 23 | pc.baud(115200); |
lktromp | 1:1349bedd5793 | 24 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 25 | pc.printf("LCD 8-bit init\r\n"); |
lktromp | 1:1349bedd5793 | 26 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 27 | charLcdResetLCD(); |
lktromp | 1:1349bedd5793 | 28 | |
lktromp | 1:1349bedd5793 | 29 | } |
lktromp | 1:1349bedd5793 | 30 | |
lktromp | 1:1349bedd5793 | 31 | |
lktromp | 1:1349bedd5793 | 32 | |
lktromp | 1:1349bedd5793 | 33 | void charLcd::charLcdResetLCD(void) { |
lktromp | 1:1349bedd5793 | 34 | cl_en = 1; |
lktromp | 1:1349bedd5793 | 35 | cl_rs = 0; // command mode |
lktromp | 1:1349bedd5793 | 36 | cl_rw = 0; |
lktromp | 1:1349bedd5793 | 37 | wait_ms(40); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 38 | charLcdFunctionSet(0,1,0); |
lktromp | 1:1349bedd5793 | 39 | wait_ms(5); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 40 | charLcdFunctionSet(0,1,0); |
lktromp | 1:1349bedd5793 | 41 | wait_us(100); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 42 | charLcdFunctionSet(0,1,0); |
lktromp | 1:1349bedd5793 | 43 | wait_us(100); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 44 | charLcdFunctionSet(0,1,0); |
lktromp | 1:1349bedd5793 | 45 | charLcdDisplayOn(0); |
lktromp | 1:1349bedd5793 | 46 | charLcdClear(); |
lktromp | 1:1349bedd5793 | 47 | charLcdEntryMode(1,0); |
lktromp | 1:1349bedd5793 | 48 | //wait_ms(20); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 49 | //charLcdFunctionSet(0,1,0); |
lktromp | 1:1349bedd5793 | 50 | //wait_ms(20); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 51 | charLcdDisplayOn(1); |
lktromp | 1:1349bedd5793 | 52 | wait_ms(20); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 53 | charLcdCursor(1, 1); |
lktromp | 1:1349bedd5793 | 54 | wait_ms(20); // Wait 15ms to ensure powered up |
lktromp | 1:1349bedd5793 | 55 | charLcdEntryMode(1,0); |
lktromp | 1:1349bedd5793 | 56 | } |
lktromp | 1:1349bedd5793 | 57 | |
lktromp | 1:1349bedd5793 | 58 | void charLcd::charLcdClear (void){ |
lktromp | 1:1349bedd5793 | 59 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 60 | pc.printf("LCD Clear\r\n"); |
lktromp | 1:1349bedd5793 | 61 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 62 | charLcdSendCommand(LCD_CLEAR); |
lktromp | 1:1349bedd5793 | 63 | } |
lktromp | 1:1349bedd5793 | 64 | void charLcd::charLcdReturnHome(){ |
lktromp | 1:1349bedd5793 | 65 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 66 | pc.printf("LCD Home\r\n"); |
lktromp | 1:1349bedd5793 | 67 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 68 | charLcdSendCommand(LCD_HOME); |
lktromp | 1:1349bedd5793 | 69 | } |
lktromp | 1:1349bedd5793 | 70 | |
lktromp | 1:1349bedd5793 | 71 | void charLcd::charLcdEntryMode(uint8 increment, uint8 shift){ |
lktromp | 1:1349bedd5793 | 72 | uint8 cmd = LCD_ENTRY_MODE; |
lktromp | 1:1349bedd5793 | 73 | if (increment == 0x00){ |
lktromp | 1:1349bedd5793 | 74 | cmd |= LCD_ENTRY_DEC; |
lktromp | 1:1349bedd5793 | 75 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 76 | pc.printf("LCD Entry Mode decrement\r\n"); |
lktromp | 1:1349bedd5793 | 77 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 78 | } else { |
lktromp | 1:1349bedd5793 | 79 | cmd |= LCD_ENTRY_INC; |
lktromp | 1:1349bedd5793 | 80 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 81 | pc.printf("LCD Entry Mode Increment\r\n"); |
lktromp | 1:1349bedd5793 | 82 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 83 | } |
lktromp | 1:1349bedd5793 | 84 | if (shift == 0x00){ |
lktromp | 1:1349bedd5793 | 85 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 86 | pc.printf("LCD Entry Mode Static\r\n"); |
lktromp | 1:1349bedd5793 | 87 | #endif //DEBUGcmd |= LCD_ENTRY_STAT; |
lktromp | 1:1349bedd5793 | 88 | |
lktromp | 1:1349bedd5793 | 89 | } else { |
lktromp | 1:1349bedd5793 | 90 | cmd |=LCD_ENTRY_SHIFT; |
lktromp | 1:1349bedd5793 | 91 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 92 | pc.printf("LCD Entry Mode Shift\r\n"); |
lktromp | 1:1349bedd5793 | 93 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 94 | } |
lktromp | 1:1349bedd5793 | 95 | charLcdSendCommand(cmd); |
lktromp | 1:1349bedd5793 | 96 | |
lktromp | 1:1349bedd5793 | 97 | } |
lktromp | 1:1349bedd5793 | 98 | |
lktromp | 1:1349bedd5793 | 99 | void charLcd::charLcdDisplayOn(uint8 on){ |
lktromp | 1:1349bedd5793 | 100 | uint8 cmd = LCD_DISPLAY_CTR; |
lktromp | 1:1349bedd5793 | 101 | if (on == 0x00){ |
lktromp | 1:1349bedd5793 | 102 | cmd |= LCD_DISP_OFF; |
lktromp | 1:1349bedd5793 | 103 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 104 | pc.printf("LCD Display Control Display off\r\n"); |
lktromp | 1:1349bedd5793 | 105 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 106 | } else { |
lktromp | 1:1349bedd5793 | 107 | cmd |= LCD_DISP_ON; |
lktromp | 1:1349bedd5793 | 108 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 109 | pc.printf("LCD Display Control Display on\r\n"); |
lktromp | 1:1349bedd5793 | 110 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 111 | } |
lktromp | 1:1349bedd5793 | 112 | charLcdSendCommand(cmd); |
lktromp | 1:1349bedd5793 | 113 | } |
lktromp | 1:1349bedd5793 | 114 | |
lktromp | 1:1349bedd5793 | 115 | void charLcd::charLcdCursor(uint8 cursor, uint8 blink){ |
lktromp | 1:1349bedd5793 | 116 | uint8 cmd = LCD_DISPLAY_CTR; |
lktromp | 1:1349bedd5793 | 117 | if (cursor == 0x00){ |
lktromp | 1:1349bedd5793 | 118 | cmd |= LCD_CURSOR_OFF; |
lktromp | 1:1349bedd5793 | 119 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 120 | pc.printf("LCD Display Control Cursor off\r\n"); |
lktromp | 1:1349bedd5793 | 121 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 122 | } else { |
lktromp | 1:1349bedd5793 | 123 | cmd |= LCD_CURSOR_ON; |
lktromp | 1:1349bedd5793 | 124 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 125 | pc.printf("LCD Display Control Cursor on\r\n"); |
lktromp | 1:1349bedd5793 | 126 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 127 | } |
lktromp | 1:1349bedd5793 | 128 | if (blink == 0x00){ |
lktromp | 1:1349bedd5793 | 129 | cmd |= LCD_BLINK_OFF; |
lktromp | 1:1349bedd5793 | 130 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 131 | pc.printf("LCD Display Control Cursor Blink off\r\n"); |
lktromp | 1:1349bedd5793 | 132 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 133 | } else { |
lktromp | 1:1349bedd5793 | 134 | cmd |=LCD_BLINK_ON; |
lktromp | 1:1349bedd5793 | 135 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 136 | pc.printf("LCD Display Control Cursor Blink on\r\n"); |
lktromp | 1:1349bedd5793 | 137 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 138 | } |
lktromp | 1:1349bedd5793 | 139 | charLcdSendCommand(cmd); |
lktromp | 1:1349bedd5793 | 140 | } |
lktromp | 1:1349bedd5793 | 141 | |
lktromp | 1:1349bedd5793 | 142 | void charLcd::charLcdShift(uint8 left, uint8 cursor){ |
lktromp | 1:1349bedd5793 | 143 | uint8 cmd = LCD_SHIFT; |
lktromp | 1:1349bedd5793 | 144 | if (left == 0x00){ |
lktromp | 1:1349bedd5793 | 145 | cmd |= LCD_SHIFT_LEFT; |
lktromp | 1:1349bedd5793 | 146 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 147 | pc.printf("LCD Shift Control Shift Left\r\n"); |
lktromp | 1:1349bedd5793 | 148 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 149 | } else { |
lktromp | 1:1349bedd5793 | 150 | cmd |= LCD_SHIFT_RIGHT; |
lktromp | 1:1349bedd5793 | 151 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 152 | pc.printf("LCD Display Control Shift Right\r\n"); |
lktromp | 1:1349bedd5793 | 153 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 154 | } |
lktromp | 1:1349bedd5793 | 155 | if (cursor == 0x00){ |
lktromp | 1:1349bedd5793 | 156 | cmd |= LCD_SHIFT_DISP; |
lktromp | 1:1349bedd5793 | 157 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 158 | pc.printf("LCD Display Control Shift Display\r\n"); |
lktromp | 1:1349bedd5793 | 159 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 160 | } else { |
lktromp | 1:1349bedd5793 | 161 | cmd |= LCD_SHIFT_CURS; |
lktromp | 1:1349bedd5793 | 162 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 163 | pc.printf("LCD Display Control Shift Cursor\r\n"); |
lktromp | 1:1349bedd5793 | 164 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 165 | } |
lktromp | 1:1349bedd5793 | 166 | charLcdSendCommand(cmd); |
lktromp | 1:1349bedd5793 | 167 | } |
lktromp | 1:1349bedd5793 | 168 | |
lktromp | 1:1349bedd5793 | 169 | void charLcd::charLcdFunctionSet(uint8 dots, uint8 lines, uint8 bits){ |
lktromp | 1:1349bedd5793 | 170 | uint8 cmd = LCD_FUNCTION; |
lktromp | 1:1349bedd5793 | 171 | if (dots == 0x00){ |
lktromp | 1:1349bedd5793 | 172 | cmd |= LCD_FUNC_5x8; |
lktromp | 1:1349bedd5793 | 173 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 174 | pc.printf("LCD Display Function Control 5x8\r\n"); |
lktromp | 1:1349bedd5793 | 175 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 176 | } else { |
lktromp | 1:1349bedd5793 | 177 | cmd |= LCD_FUNC_5x10; |
lktromp | 1:1349bedd5793 | 178 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 179 | pc.printf("LCD Display Function Control 5x10\r\n"); |
lktromp | 1:1349bedd5793 | 180 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 181 | } |
lktromp | 1:1349bedd5793 | 182 | if (lines == 0x00){ |
lktromp | 1:1349bedd5793 | 183 | cmd |= LCD_FUNC_1LINES; |
lktromp | 1:1349bedd5793 | 184 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 185 | pc.printf("LCD Display Function Control 1 Line\r\n"); |
lktromp | 1:1349bedd5793 | 186 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 187 | } else { |
lktromp | 1:1349bedd5793 | 188 | cmd |= LCD_FUNC_2LINES; |
lktromp | 1:1349bedd5793 | 189 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 190 | pc.printf("LCD Display Function Control 2 Lines\r\n"); |
lktromp | 1:1349bedd5793 | 191 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 192 | } |
lktromp | 1:1349bedd5793 | 193 | if (bits == 0x00){ |
lktromp | 1:1349bedd5793 | 194 | cmd |= LCD_FUNC_8BIT; |
lktromp | 1:1349bedd5793 | 195 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 196 | pc.printf("LCD Display Function Control 8 BIT\r\n"); |
lktromp | 1:1349bedd5793 | 197 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 198 | } else { |
lktromp | 1:1349bedd5793 | 199 | cmd |= LCD_FUNC_4BIT; |
lktromp | 1:1349bedd5793 | 200 | #ifdef DEBUG |
lktromp | 1:1349bedd5793 | 201 | pc.printf("LCD Display Function Control 4 BIT\r\n"); |
lktromp | 1:1349bedd5793 | 202 | #endif //DEBUG |
lktromp | 1:1349bedd5793 | 203 | } |
lktromp | 1:1349bedd5793 | 204 | charLcdSendCommand(cmd); |
lktromp | 1:1349bedd5793 | 205 | //#define LCD_FUNCTION 0x20 |
lktromp | 1:1349bedd5793 | 206 | //#define LCD_FUNC_5x10 0x04 |
lktromp | 1:1349bedd5793 | 207 | //#define LCD_FUNC_5x8 0x00 |
lktromp | 1:1349bedd5793 | 208 | //#define LCD_FUNC_2LINES 0x08 |
lktromp | 1:1349bedd5793 | 209 | //#define LCD_FUNC_1LINES 0x00 |
lktromp | 1:1349bedd5793 | 210 | //#define LCD_FUNC_8BIT 0x10 |
lktromp | 1:1349bedd5793 | 211 | //#define LCD_FUNC_4BIT 0x00 |
lktromp | 1:1349bedd5793 | 212 | } |
lktromp | 1:1349bedd5793 | 213 | |
lktromp | 1:1349bedd5793 | 214 | void charLcd::charLcdSetCGRAMaddress(uint8 adr) { |
lktromp | 1:1349bedd5793 | 215 | charLcdSendCommand(LCD_SET_CGRAM & adr); |
lktromp | 1:1349bedd5793 | 216 | } |
lktromp | 1:1349bedd5793 | 217 | |
lktromp | 1:1349bedd5793 | 218 | void charLcd::charLcdSetDDRAMaddress(uint8 adr) { |
lktromp | 1:1349bedd5793 | 219 | charLcdSendCommand(LCD_SET_DDRAM & adr); |
lktromp | 1:1349bedd5793 | 220 | } |
lktromp | 1:1349bedd5793 | 221 | |
lktromp | 1:1349bedd5793 | 222 | uint8 charLcd::charLcdReadBusyFlag() { |
lktromp | 1:1349bedd5793 | 223 | return 0x00; |
lktromp | 1:1349bedd5793 | 224 | } |
lktromp | 1:1349bedd5793 | 225 | |
lktromp | 1:1349bedd5793 | 226 | void charLcd::charLcdWriteData(uint8 dat){ |
lktromp | 1:1349bedd5793 | 227 | cl_rs = 1; |
lktromp | 1:1349bedd5793 | 228 | charLcdWriteByte(dat); |
lktromp | 1:1349bedd5793 | 229 | } |
lktromp | 1:1349bedd5793 | 230 | |
lktromp | 1:1349bedd5793 | 231 | uint8 charLcd::charLcdReadData(){ |
lktromp | 1:1349bedd5793 | 232 | cl_rs = 0; |
lktromp | 1:1349bedd5793 | 233 | return 0x00; |
lktromp | 1:1349bedd5793 | 234 | } |
lktromp | 1:1349bedd5793 | 235 | |
lktromp | 1:1349bedd5793 | 236 | void charLcd::charLcdSendCommand(uint8 cmd) { |
lktromp | 1:1349bedd5793 | 237 | cl_rs = 0; |
lktromp | 1:1349bedd5793 | 238 | charLcdWriteByte(cmd); |
lktromp | 1:1349bedd5793 | 239 | } |
lktromp | 1:1349bedd5793 | 240 | |
lktromp | 1:1349bedd5793 | 241 | void charLcd::charLcdWriteByte(uint8 byte) { |
lktromp | 1:1349bedd5793 | 242 | cl_charLcdData = byte; |
lktromp | 1:1349bedd5793 | 243 | pc.printf("Write %#X to LCD\r\n", byte); |
lktromp | 1:1349bedd5793 | 244 | wait_us(40); // setup time |
lktromp | 1:1349bedd5793 | 245 | cl_en = 0; |
lktromp | 1:1349bedd5793 | 246 | wait_us(40); //hold time |
lktromp | 1:1349bedd5793 | 247 | cl_en = 1; |
lktromp | 1:1349bedd5793 | 248 | } |