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/* $Id: MilfordInstruments.c,v 1.3 2003/10/08 13:39:53 andy-b Exp $
*
* driver for Milford Instruments 'BPK' piggy-back serial interface board
* for standard Hitachi 44780 compatible lcd modules.
*
* Written 2003 by Andy Baxter <andy@earthsong.free-online.co.uk>
*
* based on the MatrixOrbital driver by M. Reinelt
*
* This program 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 2, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: MilfordInstruments.c,v $
* Revision 1.3 2003/10/08 13:39:53 andy-b
* Cleaned up code in MilfordInstruments.c, and added descriptions for other display sizes (untested)
*
* Revision 1.1 2003/09/29 06:58:36 reinelt
* new driver for Milford Instruments MI420 by Andy Baxter
*
*/
/*
*
* exported fuctions:
*
* struct LCD MilfordInstruments[]
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include "debug.h"
#include "cfg.h"
#include "lock.h"
#include "display.h"
#include "bar.h"
#include "icon.h"
#define XRES 5
#define YRES 8
#define CHARS 8
static LCD Lcd;
static char *Port=NULL;
static speed_t Speed;
static int Device=-1;
static int Icons;
static char *FrameBuffer1=NULL;
static char *FrameBuffer2=NULL;
static int MI_open (void)
{
int fd;
pid_t pid;
struct termios portset;
if ((pid=lock_port(Port))!=0) {
if (pid==-1)
error ("MilfordInstruments: port %s could not be locked", Port);
else
error ("MilfordInstruments: port %s is locked by process %d", Port, pid);
return -1;
}
fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY);
if (fd==-1) {
error ("MilfordInstruments: open(%s) failed: %s", Port, strerror(errno));
unlock_port(Port);
return -1;
}
if (tcgetattr(fd, &portset)==-1) {
error ("MilfordInstruments: tcgetattr(%s) failed: %s", Port, strerror(errno));
unlock_port(Port);
return -1;
}
cfmakeraw(&portset);
cfsetospeed(&portset, Speed);
if (tcsetattr(fd, TCSANOW, &portset)==-1) {
error ("MilfordInstruments: tcsetattr(%s) failed: %s", Port, strerror(errno));
unlock_port(Port);
return -1;
}
return fd;
}
static void MI_write (char *string, int len)
{
if (Device==-1) return;
if (write (Device, string, len)==-1) {
if (errno==EAGAIN) {
usleep(1000);
if (write (Device, string, len)>=0) return;
}
error ("MilfordInstruments: write(%s) failed: %s", Port, strerror(errno));
}
}
static void MI_define_char (int ascii, char *buffer)
{
char cmd[2]="\376x";
if (ascii<8) {
cmd[1]=(char)(64+ascii*8);
MI_write (cmd, 2);
MI_write (buffer, 8);
}
}
static int MI_clear (int full)
{
memset (FrameBuffer1, ' ', Lcd.rows*Lcd.cols*sizeof(char));
icon_clear();
bar_clear();
if (full) {
memset (FrameBuffer2, ' ', Lcd.rows*Lcd.cols*sizeof(char));
MI_write ("\376\001", 2); // clear screen
}
return 0;
}
static int MI_init (LCD *Self)
{
char *port;
int speed;
Lcd=*Self;
// Init the framebuffers
FrameBuffer1 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
FrameBuffer2 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
if (FrameBuffer1==NULL || FrameBuffer2==NULL) {
error ("MilfordInstruments: framebuffer could not be allocated: malloc() failed");
return -1;
}
if (Port) {
free (Port);
Port=NULL;
}
port=cfg_get ("Port",NULL);
if (port==NULL || *port=='\0') {
error ("MilfordInstruments: no 'Port' entry in %s", cfg_source());
return -1;
}
Port=strdup(port);
if (cfg_number("Speed", 19200, 1200,19200, &speed)<0) return -1;
switch (speed) {
case 2400:
Speed=B2400;
break;
case 9600:
Speed=B9600;
break;
default:
error ("MilfordInstruments: unsupported speed '%d' in %s", speed, cfg_source());
return -1;
}
debug ("using port %s at %d baud", Port, speed);
Device=MI_open();
if (Device==-1) return -1;
if (cfg_number("Icons", 0, 0, CHARS, &Icons)<0) return -1;
if (Icons>0) {
debug ("reserving %d of %d user-defined characters for icons", Icons, CHARS);
icon_init(Lcd.rows, Lcd.cols, XRES, YRES, CHARS, Icons, MI_define_char);
Self->icons=Icons;
Lcd.icons=Icons;
}
bar_init(Lcd.rows, Lcd.cols, XRES, YRES, CHARS-Icons);
bar_add_segment( 0, 0,255, 32); // ASCII 32 = blank
bar_add_segment(255,255,255,255); // ASCII 255 = block
MI_clear(1);
MI_write ("\376\014", 2); // cursor off
return 0;
}
void MI_goto (int row, int col)
{
char cmd[2]="\376x";
char ddbase=128;
if (row & 1) { // i.e. if row is 1 or 3
ddbase += 64;
};
if (row & 2) { // i.e. if row is 0 or 2.
ddbase += 20;
};
cmd[1]=(char)(ddbase+col);
MI_write(cmd,2);
}
int MI_put (int row, int col, char *text)
{
char *p=FrameBuffer1+row*Lcd.cols+col;
char *t=text;
while (*t && col++<=Lcd.cols) {
*p++=*t++;
}
return 0;
}
int MI_bar (int type, int row, int col, int max, int len1, int len2)
{
return bar_draw (type, row, col, max, len1, len2);
}
int MI_icon (int num, int seq, int row, int col)
{
return icon_draw (num, seq, row, col);
}
static int MI_flush (void)
{
int row, col, pos1, pos2;
int c, equal;
bar_process(MI_define_char);
for (row=0; row<Lcd.rows; row++) {
for (col=0; col<Lcd.cols; col++) {
c=bar_peek(row, col);
if (c==-1) c=icon_peek(row, col);
if (c!=-1) {
FrameBuffer1[row*Lcd.cols+col]=(char)c;
}
}
for (col=0; col<Lcd.cols; col++) {
if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) continue;
MI_goto (row, col);
for (pos1=col++, pos2=pos1, equal=0; col<Lcd.cols; col++) {
if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) {
// If we find just one equal byte, we don't break, because this
// would require a goto, which takes one byte, too.
if (++equal>5) break;
} else {
pos2=col;
equal=0;
}
}
MI_write (FrameBuffer1+row*Lcd.cols+pos1, pos2-pos1+1);
}
}
memcpy (FrameBuffer2, FrameBuffer1, Lcd.rows*Lcd.cols*sizeof(char));
return 0;
}
int MI_quit (void)
{
info("MilfordInstruments: shutting down.");
debug ("closing port %s", Port);
close (Device);
unlock_port(Port);
if (FrameBuffer1) {
free(FrameBuffer1);
FrameBuffer1=NULL;
}
if (FrameBuffer2) {
free(FrameBuffer2);
FrameBuffer2=NULL;
}
return (0);
}
LCD MilfordInstruments[] = {
{ name: "MI216",
rows: 2,
cols: 16,
xres: XRES,
yres: YRES,
bars: BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2,
icons: 0,
gpos: 0,
init: MI_init,
clear: MI_clear,
put: MI_put,
bar: MI_bar,
icon: MI_icon,
gpo: NULL,
flush: MI_flush,
quit: MI_quit
},
{ name: "MI220",
rows: 2,
cols: 20,
xres: XRES,
yres: YRES,
bars: BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2,
icons: 0,
gpos: 0,
init: MI_init,
clear: MI_clear,
put: MI_put,
bar: MI_bar,
icon: MI_icon,
gpo: NULL,
flush: MI_flush,
quit: MI_quit
},
{ name: "MI240",
rows: 2,
cols: 40,
xres: XRES,
yres: YRES,
bars: BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2,
icons: 0,
gpos: 0,
init: MI_init,
clear: MI_clear,
put: MI_put,
bar: MI_bar,
icon: MI_icon,
gpo: NULL,
flush: MI_flush,
quit: MI_quit
},
{ name: "MI420",
rows: 4,
cols: 20,
xres: XRES,
yres: YRES,
bars: BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2,
icons: 0,
gpos: 0,
init: MI_init,
clear: MI_clear,
put: MI_put,
bar: MI_bar,
icon: MI_icon,
gpo: NULL,
flush: MI_flush,
quit: MI_quit
},
{ NULL }
};
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