Mercurial > mbsePi-apps / file comparison
comparison: brewco/lcd-pcf8574.c
brewco/lcd-pcf8574.c
- changeset 487
- d5bc44183aa4
- parent 486
- 5a237a99a793
- child 488
- bee1f70fb42b
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| 486:5a237a99a793 | 487:d5bc44183aa4 |
|---|---|
| 1 /* | |
| 2 * lcd-pcf8574.c: | |
| 3 * Text-based LCD driver library code | |
| 4 * This is designed to drive the HD44780U LCD display connected via | |
| 5 * a "LCM1602 IIC A0 A1 A2" board with a PCF8574 I2C controller. | |
| 6 * | |
| 7 * Copyright (c) 2012-2013 Gordon Henderson. | |
| 8 * Copyright (c) 2014 Michiel Broek. | |
| 9 *********************************************************************** | |
| 10 * | |
| 11 * mbsePi is free software: you can redistribute it and/or modify | |
| 12 * it under the terms of the GNU Lesser General Public License as published by | |
| 13 * the Free Software Foundation, either version 3 of the License, or | |
| 14 * (at your option) any later version. | |
| 15 * | |
| 16 * mbsePi is distributed in the hope that it will be useful, | |
| 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 * GNU Lesser General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU Lesser General Public License | |
| 22 * along with wiringPi. If not, see <http://www.gnu.org/licenses/>. | |
| 23 *********************************************************************** | |
| 24 */ | |
| 25 | |
| 26 #include "brewco.h" | |
| 27 #include "lcd-pcf8574.h" | |
| 28 #include "slcd.h" | |
| 29 | |
| 30 | |
| 31 int lcdHandle; | |
| 32 int slcdHandle; | |
| 33 | |
| 34 | |
| 35 #ifdef HAVE_WIRINGPI_H | |
| 36 struct lcdDataStruct | |
| 37 { | |
| 38 int bits, rows, cols ; | |
| 39 int rsPin, strbPin ; | |
| 40 int dataPins [8] ; | |
| 41 int cx, cy ; | |
| 42 }; | |
| 43 | |
| 44 extern struct lcdDataStruct *lcds [MAX_LCDS]; | |
| 45 #endif | |
| 46 extern sys_config Config; | |
| 47 extern uint16_t leds; | |
| 48 | |
| 49 | |
| 50 /* | |
| 51 * setBacklight: | |
| 52 ********************************************************************************* | |
| 53 */ | |
| 54 void setBacklight(int value) | |
| 55 { | |
| 56 #ifdef HAVE_WIRINGPI_H | |
| 57 pinMode (AF_BACKLIGHT, OUTPUT) ; | |
| 58 digitalWrite (AF_BACKLIGHT, (value & 1)) ; | |
| 59 #endif | |
| 60 if (value) { | |
| 61 leds |= SLED_LCD; | |
| 62 } else { | |
| 63 leds &= ~SLED_LCD; | |
| 64 } | |
| 65 slcdLEDs(slcdHandle); | |
| 66 } | |
| 67 | |
| 68 | |
| 69 /* | |
| 70 * initLCD: | |
| 71 ********************************************************************************* | |
| 72 */ | |
| 73 | |
| 74 int initLCD(int cols, int rows) | |
| 75 { | |
| 76 if (!((rows == 1) || (rows == 2) || (rows == 4))) { | |
| 77 fprintf (stderr, "rows must be 1, 2 or 4\n") ; | |
| 78 return EXIT_FAILURE ; | |
| 79 } | |
| 80 | |
| 81 if (!((cols == 16) || (cols == 20))) { | |
| 82 fprintf (stderr, "cols must be 16 or 20\n") ; | |
| 83 return EXIT_FAILURE ; | |
| 84 } | |
| 85 | |
| 86 #ifdef HAVE_WIRINGPI_H | |
| 87 pcf8574Setup(AF_BASE, 0x27) ; | |
| 88 pinMode (AF_RW, OUTPUT) ; | |
| 89 digitalWrite (AF_RW, LOW) ; // Not used with wiringPi - always in write mode | |
| 90 | |
| 91 /* | |
| 92 * The other control pins are initialised with lcdInit () | |
| 93 */ | |
| 94 lcdHandle = lcdInit (rows, cols, 4, AF_RS, AF_E, AF_DB4, AF_DB5, AF_DB6, AF_DB7, 0, 0, 0, 0) ; | |
| 95 if (lcdHandle < 0) { | |
| 96 fprintf (stderr, "lcdInit failed\n") ; | |
| 97 return -1 ; | |
| 98 } | |
| 99 | |
| 100 lcdClear (lcdHandle) ; | |
| 101 #endif | |
| 102 | |
| 103 slcdHandle = slcdInit(0, rows, cols); | |
| 104 if (slcdHandle < 0) { | |
| 105 fprintf (stderr, "slcdInit failed\n") ; | |
| 106 return -1; | |
| 107 } | |
| 108 slcdClear(slcdHandle); | |
| 109 setBacklight(1); | |
| 110 | |
| 111 return 0 ; | |
| 112 } | |
| 113 | |
| 114 |
