New LCD library plus -v option for gpio binary
This commit is contained in:
Gordon Drogon
Philip Howard
parent
d8e44ea3a6
commit
43aa862e97
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@ -35,11 +35,11 @@ LIBS = -lwiringPi
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# Should not alter anything below this line
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###############################################################################
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SRC = test1.c test2.c speed.c
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SRC = test1.c test2.c speed.c lcd.c
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OBJ = test1.o test2.o speed.o
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OBJ = test1.o test2.o speed.o lcd.o
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all: test1 test2 speed
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all: test1 test2 speed lcd
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test1: test1.o
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@echo [link]
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@ -52,14 +52,18 @@ test2: test2.o
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speed: speed.o
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@echo [link]
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$(CC) -o $@ speed.o $(LDFLAGS) $(LIBS)
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lcd: lcd.o
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@echo [link]
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$(CC) -o $@ lcd.o $(LDFLAGS) $(LIBS)
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.c.o:
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@echo [CC] $<
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@$(CC) -c $(CFLAGS) $< -o $@
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clean:
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rm -f $(OBJ) *~ core tags test1 test2 speed
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rm -f $(OBJ) *~ core tags test1 test2 speed lcd
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tags: $(SRC)
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@echo [ctags]
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@ -0,0 +1,129 @@
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/*
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* lcd.c:
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* Text-based LCD driver.
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* This is designed to drive the parallel interface LCD drivers
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* based in the Hitachi HD44780U controller and compatables.
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*
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* Copyright (c) 2012 Gordon Henderson.
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <wiringPi.h>
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#include <lcd.h>
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int main (void)
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{
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int i, j ;
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int fd1, fd2 ;
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char message1 [256] ;
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char message2 [256] ;
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char buf1 [30] ;
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char buf2 [30] ;
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struct tm *t ;
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time_t tim ;
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printf ("Raspberry Pi LCD test program\n") ;
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if (wiringPiSetup () == -1)
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exit (1) ;
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fd1 = lcdInit (4, 20, 4, 8, 9, 4,5,6,7,0,0,0,0) ;
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fd2 = lcdInit (2, 16, 4, 8, 10, 4,5,6,7,0,0,0,0) ;
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//fd1 = lcdInit (4, 20, 8, 8, 9, 0,1,2,3,4,5,6,7) ;
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//fd2 = lcdInit (2, 16, 8, 8, 10, 0,1,2,3,4,5,6,7) ;
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if (fd1 == -1)
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{
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printf ("lcdInit 1 failed\n") ;
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return 1 ;
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}
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if (fd2 == -1)
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{
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printf ("lcdInit 2 failed\n") ;
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return 1 ;
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}
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sleep (1) ;
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lcdPosition (fd1, 0, 0) ; lcdPuts (fd1, " Gordon Henderson") ;
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lcdPosition (fd1, 0, 1) ; lcdPuts (fd1, " --------------") ;
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/*
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lcdPosition (fd1, 0, 2) ; lcdPuts (fd1, " 00:00:00") ;
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lcdPosition (fd1, 0, 3) ; lcdPuts (fd1, " DD:MM:YY") ;
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*/
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lcdPosition (fd2, 0, 0) ; lcdPuts (fd2, "Gordon Henderson") ;
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lcdPosition (fd2, 0, 1) ; lcdPuts (fd2, "----------------") ;
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sleep (2) ;
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sprintf (message1, "%s", " http://projects.drogon.net/ ") ;
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sprintf (message2, "%s", " This is a long message to go into the smaller display just for a demonstration of what we can do. ") ;
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for (;;)
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{
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i = 0 ;
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j = 0 ;
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for (;;)
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{
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strncpy (buf1, &message1 [i], 20) ;
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buf1 [20] = 0 ;
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lcdPosition (fd1, 0, 1) ;
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lcdPuts (fd1, buf1) ;
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++i ;
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if (i == strlen (message1) - 20)
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i = 0 ;
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strncpy (buf2, &message2 [j], 16) ;
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buf2 [16] = 0 ;
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lcdPosition (fd2, 0, 1) ;
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lcdPuts (fd2, buf2) ;
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++j ;
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if (j == strlen (message2) - 16)
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j = 0 ;
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tim = time (NULL) ;
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t = localtime (&tim) ;
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sprintf (buf1, "%02d:%02d:%02d", t->tm_hour, t->tm_min, t->tm_sec) ;
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lcdPosition (fd1, 5, 2) ;
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lcdPuts (fd1, buf1) ;
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sprintf (buf1, "%02d/%02d/%02d", t->tm_mday, t->tm_mon + 1, t->tm_year+1900) ;
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lcdPosition (fd1, 4, 3) ;
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lcdPuts (fd1, buf1) ;
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delay (250) ;
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}
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}
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return 0 ;
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}
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17
gpio/gpio.c
17
gpio/gpio.c
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@ -30,14 +30,17 @@
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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//#include <sys/stat.h>
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#include <fcntl.h>
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#define VERSION "1.0"
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static int wpMode ;
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char *usage = "Usage: gpio [-g] <read/write/pwm/mode/export/unexport/exports> ..." ;
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char *usage = "Usage: gpio -v\n"
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" gpio [-g] <read/write/pwm/mode/> ...\n"
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" gpio <export/unexport/exports> ..." ;
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/*
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@ -367,6 +370,14 @@ int main (int argc, char *argv [])
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return 1 ;
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}
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if (strcasecmp (argv [1], "-v") == 0)
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{
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printf ("gpio version: %s\n", VERSION) ;
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printf ("Copyright (c) 2012 Gordon Henderson\n") ;
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printf ("This is free software with ABSOLUTELY NO WARRANTY.\n") ;
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return 0 ;
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}
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// Initial test for /sys/class/gpio operations:
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/**/ if (strcasecmp (argv [1], "exports" ) == 0)
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@ -411,7 +422,7 @@ int main (int argc, char *argv [])
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doPwm (argc, argv) ;
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else
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{
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fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode/export/unexport expected)\n", argv [0], argv [1]) ;
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fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode expected)\n", argv [0], argv [1]) ;
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exit (1) ;
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}
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return 0 ;
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@ -35,9 +35,9 @@ LIBS =
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# Should not alter anything below this line
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###############################################################################
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SRC = wiringPi.c serial.c wiringShift.c
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SRC = wiringPi.c serial.c wiringShift.c lcd.c
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OBJ = wiringPi.o serial.o wiringShift.o
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OBJ = wiringPi.o serial.o wiringShift.o lcd.o
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all: $(TARGET)
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@ -0,0 +1,365 @@
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/*
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* lcd.c:
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* Text-based LCD driver.
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* This is designed to drive the parallel interface LCD drivers
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* based in the Hitachi HD44780U controller and compatables.
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*
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* Copyright (c) 2012 Gordon Henderson.
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include "wiringPi.h"
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#include "lcd.h"
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// Commands
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#define LCD_CLEAR 0x01
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#define LCD_HOME 0x02
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#define LCD_ENTRY 0x04
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#define LCD_ON_OFF 0x08
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#define LCD_CDSHIFT 0x10
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#define LCD_FUNC 0x20
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#define LCD_CGRAM 0x40
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#define LCD_DGRAM 0x80
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#define LCD_ENTRY_SH 0x01
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#define LCD_ENTRY_ID 0x02
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#define LCD_ON_OFF_B 0x01
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#define LCD_ON_OFF_C 0x02
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#define LCD_ON_OFF_D 0x04
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#define LCD_FUNC_F 0x04
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#define LCD_FUNC_N 0x08
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#define LCD_FUNC_DL 0x10
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#define LCD_CDSHIFT_RL 0x04
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struct lcdDataStruct
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{
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uint8_t bits, rows, cols ;
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uint8_t rsPin, strbPin ;
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uint8_t dataPins [8] ;
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} ;
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struct lcdDataStruct *lcds [MAX_LCDS] ;
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/*
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* strobe:
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* Toggle the strobe (Really the "E") pin to the device.
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* According to the docs, data is latched on the falling edge.
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*********************************************************************************
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*/
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static void strobe (struct lcdDataStruct *lcd)
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{
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digitalWrite (lcd->strbPin, 1) ; delayMicroseconds (1) ;
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digitalWrite (lcd->strbPin, 0) ; delayMicroseconds (50) ;
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}
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/*
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* sentDataCmd:
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* Send an data or command byte to the display.
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*********************************************************************************
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*/
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static void sendDataCmd (struct lcdDataStruct *lcd, uint8_t data)
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{
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uint8_t i, d4 ;
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if (lcd->bits == 4)
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{
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d4 = (data >> 4) & 0x0F;
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for (i = 0 ; i < 4 ; ++i)
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{
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digitalWrite (lcd->dataPins [i], (d4 & 1)) ;
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d4 >>= 1 ;
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}
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strobe (lcd) ;
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d4 = data & 0x0F ;
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for (i = 0 ; i < 4 ; ++i)
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{
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digitalWrite (lcd->dataPins [i], (d4 & 1)) ;
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d4 >>= 1 ;
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}
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}
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else
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{
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for (i = 0 ; i < 8 ; ++i)
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{
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digitalWrite (lcd->dataPins [i], (data & 1)) ;
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data >>= 1 ;
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}
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}
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strobe (lcd) ;
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}
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/*
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* putCommand:
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* Send a command byte to the display
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*********************************************************************************
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*/
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static void putCommand (struct lcdDataStruct *lcd, uint8_t command)
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{
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digitalWrite (lcd->rsPin, 0) ;
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sendDataCmd (lcd, command) ;
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}
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static void put4Command (struct lcdDataStruct *lcd, uint8_t command)
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{
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uint8_t i ;
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digitalWrite (lcd->rsPin, 0) ;
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for (i = 0 ; i < 4 ; ++i)
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{
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digitalWrite (lcd->dataPins [i], (command & 1)) ;
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command >>= 1 ;
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}
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strobe (lcd) ;
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}
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/*
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*********************************************************************************
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* User Code below here
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*********************************************************************************
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*/
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/*
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* lcdHome: lcdClear:
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* Home the cursor or clear the screen.
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*********************************************************************************
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*/
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void lcdHome (int fd)
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{
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struct lcdDataStruct *lcd = lcds [fd] ;
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putCommand (lcd, LCD_HOME) ;
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}
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void lcdClear (int fd)
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{
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struct lcdDataStruct *lcd = lcds [fd] ;
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putCommand (lcd, LCD_CLEAR) ;
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}
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/*
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* lcdPosition:
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* Update the position of the cursor on the display
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*********************************************************************************
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*/
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void lcdPosition (int fd, int x, int y)
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{
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static uint8_t rowOff [4] = { 0x00, 0x40, 0x14, 0x54 } ;
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struct lcdDataStruct *lcd = lcds [fd] ;
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putCommand (lcd, x + (LCD_DGRAM | rowOff [y])) ;
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}
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/*
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* lcdPutchar:
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* Send a data byte to be displayed on the display
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*********************************************************************************
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*/
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void lcdPutchar (int fd, uint8_t data)
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{
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struct lcdDataStruct *lcd = lcds [fd] ;
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digitalWrite (lcd->rsPin, 1) ;
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sendDataCmd (lcd, data) ;
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}
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/*
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* lcdPuts:
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* Send a string to be displayed on the display
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*********************************************************************************
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*/
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void lcdPuts (int fd, char *string)
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{
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while (*string)
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lcdPutchar (fd, *string++) ;
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}
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/*
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* lcdPrintf:
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* Printf to an LCD display
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*********************************************************************************
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*/
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void lcdPrintf (int fd, char *message, ...)
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{
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va_list argp ;
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char buffer [1024] ;
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va_start (argp, message) ;
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vsnprintf (buffer, 1023, message, argp) ;
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va_end (argp) ;
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lcdPuts (fd, buffer) ;
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}
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/*
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* lcdInit:
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* Take a lot of parameters and initialise the LCD, and return a handle to
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* that LCD, or -1 if any error.
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*********************************************************************************
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*/
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int lcdInit (int rows, int cols, int bits, int rs, int strb,
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int d0, int d1, int d2, int d3, int d4, int d5, int d6, int d7)
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{
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static int initialised = 0 ;
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uint8_t func ;
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int i ;
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int lcdFd = -1 ;
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struct lcdDataStruct *lcd ;
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if (initialised == 0)
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{
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initialised = 1 ;
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for (i = 0 ; i < MAX_LCDS ; ++i)
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lcds [i] = NULL ;
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}
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// Simple sanity checks
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if (! ((bits == 4) || (bits == 8)))
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return -1 ;
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if ((rows < 0) || (rows > 20))
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return -1 ;
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if ((cols < 0) || (cols > 20))
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return -1 ;
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// Create a new LCD:
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for (i = 0 ; i < MAX_LCDS ; ++i)
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{
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if (lcds [i] == NULL)
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{
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lcdFd = i ;
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break ;
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}
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}
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if (lcdFd == -1)
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return -1 ;
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lcd = malloc (sizeof (struct lcdDataStruct)) ;
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if (lcd == NULL)
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return -1 ;
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lcd->rsPin = rs ;
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lcd->strbPin = strb ;
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lcd->bits = 8 ; // For now - we'll set it properly later.
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lcd->rows = rows ;
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lcd->cols = cols ;
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|
||||
lcd->dataPins [0] = d0 ;
|
||||
lcd->dataPins [1] = d1 ;
|
||||
lcd->dataPins [2] = d2 ;
|
||||
lcd->dataPins [3] = d3 ;
|
||||
lcd->dataPins [4] = d4 ;
|
||||
lcd->dataPins [5] = d5 ;
|
||||
lcd->dataPins [6] = d6 ;
|
||||
lcd->dataPins [7] = d7 ;
|
||||
|
||||
lcds [lcdFd] = lcd ;
|
||||
|
||||
digitalWrite (lcd->rsPin, 0) ; pinMode (lcd->rsPin, OUTPUT) ;
|
||||
digitalWrite (lcd->strbPin, 0) ; pinMode (lcd->strbPin, OUTPUT) ;
|
||||
|
||||
for (i = 0 ; i < bits ; ++i)
|
||||
{
|
||||
digitalWrite (lcd->dataPins [i], 0) ;
|
||||
pinMode (lcd->dataPins [i], OUTPUT) ;
|
||||
}
|
||||
delay (35) ; // mS
|
||||
|
||||
|
||||
// 4-bit mode?
|
||||
// OK. This is a PIG and it's not at all obvious from the documentation I had,
|
||||
// so I guess some others have worked through either with better documentation
|
||||
// or more trial and error... Anyway here goes:
|
||||
//
|
||||
// It seems that the controller needs to see the FUNC command at least 3 times
|
||||
// consecutively - in 8-bit mode. If you're only using 8-bit mode, then it appears
|
||||
// that you can get away with one func-set, however I'd not rely on it...
|
||||
//
|
||||
// So to set 4-bit mode, you need to send the commands one nibble at a time,
|
||||
// the same three times, but send the command to set it into 8-bit mode those
|
||||
// three times, then send a final 4th command to set it into 4-bit mode, and only
|
||||
// then can you flip the switch for the rest of the library to work in 4-bit
|
||||
// mode which sends the commands as 2 x 4-bit values.
|
||||
|
||||
if (bits == 4)
|
||||
{
|
||||
func = LCD_FUNC | LCD_FUNC_DL ; // Set 8-bit mode 3 times
|
||||
put4Command (lcd, func >> 4) ; delay (35) ;
|
||||
put4Command (lcd, func >> 4) ; delay (35) ;
|
||||
put4Command (lcd, func >> 4) ; delay (35) ;
|
||||
func = LCD_FUNC ; // 4th set: 4-bit mode
|
||||
put4Command (lcd, func >> 4) ; delay (35) ;
|
||||
lcd->bits = 4 ;
|
||||
}
|
||||
else
|
||||
{
|
||||
func = LCD_FUNC | LCD_FUNC_DL ;
|
||||
putCommand (lcd, func ) ; delay (35) ;
|
||||
putCommand (lcd, func ) ; delay (35) ;
|
||||
putCommand (lcd, func ) ; delay (35) ;
|
||||
}
|
||||
|
||||
if (lcd->rows > 1)
|
||||
{
|
||||
func |= LCD_FUNC_N ;
|
||||
putCommand (lcd, func) ; delay (35) ;
|
||||
}
|
||||
|
||||
// Rest of the initialisation sequence
|
||||
|
||||
putCommand (lcd, LCD_ON_OFF | LCD_ON_OFF_D) ; delay (2) ;
|
||||
putCommand (lcd, LCD_ENTRY | LCD_ENTRY_ID) ; delay (2) ;
|
||||
putCommand (lcd, LCD_CDSHIFT | LCD_CDSHIFT_RL) ; delay (2) ;
|
||||
putCommand (lcd, LCD_CLEAR) ; delay (5) ;
|
||||
|
||||
return lcdFd ;
|
||||
}
|
||||
|
|
@ -0,0 +1,37 @@
|
|||
/*
|
||||
* lcd.h:
|
||||
* Text-based LCD driver.
|
||||
* This is designed to drive the parallel interface LCD drivers
|
||||
* based in the Hitachi HD44780U controller and compatables.
|
||||
*
|
||||
* Copyright (c) 2012 Gordon Henderson.
|
||||
***********************************************************************
|
||||
* This file is part of wiringPi:
|
||||
* https://projects.drogon.net/raspberry-pi/wiringpi/
|
||||
*
|
||||
* wiringPi is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* wiringPi 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 General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
|
||||
***********************************************************************
|
||||
*/
|
||||
|
||||
#define MAX_LCDS 8
|
||||
|
||||
extern void lcdHome (int fd) ;
|
||||
extern void lcdClear (int fd) ;
|
||||
extern void lcdPosition (int fd, int x, int y) ;
|
||||
extern void lcdPutchar (int fd, uint8_t data) ;
|
||||
extern void lcdPuts (int fd, char *string) ;
|
||||
extern void lcdPrintf (int fd, char *message, ...) ;
|
||||
|
||||
extern int lcdInit (int rows, int cols, int bits, int rs, int strb,
|
||||
int d0, int d1, int d2, int d3, int d4, int d5, int d6, int d7) ;
|
||||
Loading…
Reference in New Issue