Fri, 02 May 2014 21:04:20 +0200
Version 0.0.2. Added LCD display using wiringPi library. The display is connected via a LCM1602 IIC board.
/* * lcd-pcf8574.c: * Text-based LCD driver library code * This is designed to drive the HD44780U LCD display connected via * a "LCM1602 IIC A0 A1 A2" board with a PCF8574 I2C controller. * * Copyright (c) 2012-2013 Gordon Henderson. * Copyright (c) 2014 Michiel Broek. *********************************************************************** * * mbsePi is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * mbsePi is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with wiringPi. If not, see <http://www.gnu.org/licenses/>. *********************************************************************** */ #include "../config.h" #include "mbselib.h" //#include <stdio.h> //#include <stdlib.h> //#include <unistd.h> //#include <stdint.h> //#include <string.h> //#include <time.h> //#include <wiringPi.h> //#include <pcf8574.h> //#include <lcd.h> //#ifndef TRUE //# define TRUE (1==1) //# define FALSE (1==2) //#endif // Defines for the pcf8574 Pi LCD interface board //#define AF_BASE 100 //#define AF_RS (AF_BASE + 0) //#define AF_RW (AF_BASE + 1) //#define AF_E (AF_BASE + 2) //#define AF_BACKLIGHT (AF_BASE + 3) //#define AF_DB4 (AF_BASE + 4) //#define AF_DB5 (AF_BASE + 5) //#define AF_DB6 (AF_BASE + 6) //#define AF_DB7 (AF_BASE + 7) // User-Defined character test // Global lcd handle: int lcdHandle; /* * setBacklight: ********************************************************************************* */ void setBacklight (int value) { pinMode (AF_BACKLIGHT, OUTPUT) ; digitalWrite (AF_BACKLIGHT, (value & 1)) ; } /* * initLCD: ********************************************************************************* */ int initLCD (int cols, int rows) { if (!((rows == 1) || (rows == 2) || (rows == 4))) { fprintf (stderr, "rows must be 1, 2 or 4\n") ; return EXIT_FAILURE ; } if (!((cols == 16) || (cols == 20))) { fprintf (stderr, "cols must be 16 or 20\n") ; return EXIT_FAILURE ; } wiringPiSetupSys () ; pcf8574Setup (AF_BASE, 0x27) ; setBacklight (1) ; pinMode (AF_RW, OUTPUT) ; digitalWrite (AF_RW, LOW) ; // Not used with wiringPi - always in write mode // The other control pins are initialised with lcdInit () lcdHandle = lcdInit (rows, cols, 4, AF_RS, AF_E, AF_DB4, AF_DB5, AF_DB6, AF_DB7, 0, 0, 0, 0) ; if (lcdHandle < 0) { fprintf (stderr, "lcdInit failed\n") ; return -1 ; } lcdClear (lcdHandle) ; return 0 ; }