--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/brewco/lcd-pcf8574.c Wed Nov 25 22:49:35 2015 +0100 @@ -0,0 +1,114 @@ +/* + * 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 "brewco.h" +#include "lcd-pcf8574.h" +#include "slcd.h" + + +int lcdHandle; +int slcdHandle; + + +#ifdef HAVE_WIRINGPI_H +struct lcdDataStruct +{ + int bits, rows, cols ; + int rsPin, strbPin ; + int dataPins [8] ; + int cx, cy ; +}; + +extern struct lcdDataStruct *lcds [MAX_LCDS]; +#endif +extern sys_config Config; +extern uint16_t leds; + + +/* + * setBacklight: + ********************************************************************************* + */ +void setBacklight(int value) +{ +#ifdef HAVE_WIRINGPI_H + pinMode (AF_BACKLIGHT, OUTPUT) ; + digitalWrite (AF_BACKLIGHT, (value & 1)) ; +#endif + if (value) { + leds |= SLED_LCD; + } else { + leds &= ~SLED_LCD; + } + slcdLEDs(slcdHandle); +} + + +/* + * 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 ; + } + +#ifdef HAVE_WIRINGPI_H + pcf8574Setup(AF_BASE, 0x27) ; + 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) ; +#endif + + slcdHandle = slcdInit(0, rows, cols); + if (slcdHandle < 0) { + fprintf (stderr, "slcdInit failed\n") ; + return -1; + } + slcdClear(slcdHandle); + setBacklight(1); + + return 0 ; +} + +