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Merged Andrew McMeikan's HD44780 changes; replaced WHATNEWS with ChangeLog;

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updated ChangeLog
This commit is contained in:
William Ferrell
1999-12-15 03:34:51 +00:00
parent e6431e9827
commit a783963964
2 changed files with 215 additions and 31 deletions
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WHATSNEW → ChangeLog
+6
View File
@@ -11,6 +11,12 @@ Coming soon: (?) (my list of stuff to do soon...)
* Better syntax for driver parameters
* Dynamically-loaded driver system
v0.4-pre10:
* Merged Andrew McMeikan's HD44780 driver changes
- Removed WHATSNEW
+ Added ChangeLog (okay, fine, I renamed WHATSNEW and typed a few
entries into it :)
V0.4-pre9:
* small fixes for irix
* Added flag in LCDd to shut off server screen:
server/drivers/hd44780.c
+209 -31
View File
@@ -2,6 +2,18 @@
* The module is operated in it's 4 bit-mode to be connected to a single
* 8 bit-port
*
* Modified 16-19 Nov 1999 Andrew McMeikan
* fixed hard coded geometry issues, finished support for split screens
*
* Modified 10 Nov 1999 Andrew McMeikan
* put back in Benjamin Tse's LCD_Pause to avoid timing errors
* 13 Nov, fixed delay times in old 4 bit code
* Modified 19-26 Oct 1999 Andrew McMeikan <andrewm@engineer.com>
* to support connection via a shift register with keypad
* 4094 conection details at http://members.xoom.com/andrewmuck/LCD.htm
* TODO: document connections
* also started mods for two lcd enable lines (40x4) or 2x(2x20)
*
* Copyright (c) 1998 Richard Rognlie GNU Public License
* <rrognlie@gamerz.net>
*
@@ -38,9 +50,39 @@
lcd_logical_driver *HD44780;
#define EN 64
/* shift register code by andrewm@engineer.com *
* uncomment the next line if you do want to use *
* a shift register to connect to the LCD */
//#define USE_SHIFT_REG
//#define SPLIT_SCREENS
/* If you are using two LCD Displays or an 8 line or a *
* 40x4 you want to define SPLIT_SCREENS */
#define FONTSIZE 0
// 4= 7line font 0=10 line font (default was 0=10 line andrewm)
#define RW 32
#define RS 16
#ifndef USE_SHIFT_REG
#define LCDEN 64
#ifdef SPLIT_SCREENS
#define SECONDLCDEN 128
#endif
#endif
#ifdef USE_SHIFT_REG
#define LCDDATA 8
#define LCDCLOCK 16
#define LCDEN 4
#ifdef SPLIT_SCREENS
#define SECONDLCDEN 32
#endif
#endif
#ifndef SECONDLCDEN
#define SECONDLCDEN 0
#endif
#ifndef LPTPORT
unsigned int port = 0x378;
@@ -56,13 +98,62 @@ static void HD44780_autoscroll(int on);
static int lp;
static void HD44780_senddata(unsigned char flags, unsigned char ch)
// IO delay to avoid a task switch
void LCD_Pause(int delayCalls)
{
int i;
for (i = 0; i < delayCalls; ++i)
port_in(port);
//TODO: put in option for nanosleep rather than dummy I/O call
}
#ifdef USE_SHIFT_REG
static char lastkey=0;
static char HD44780_getkey();
void rawshift (unsigned char r) /* this function sends r out *
* onto the shift register */
{
int i;
for (i=7;i>=0;i--) /* MSB first */
{
port_out(lp,((r>>i)&1)*LCDDATA); /*set up data */
port_out(lp,(((r>>i)&1)*LCDDATA)|LCDCLOCK);/*rising edge of clock */
}
}
void shiftreg (unsigned char displayID, unsigned char r)
{
rawshift(r);
port_out(lp,displayID); //latch it, to correct display
port_out(lp,0);
}
#endif
static void HD44780_senddata(unsigned char displayID, unsigned char flags, unsigned char ch)
{
unsigned char h = ch >> 4;
unsigned char l = ch & 15;
port_out(lp, 128 | EN | flags | h); usleep(1); port_out(lp, 128 | flags | h);
port_out(lp, 128 | EN | flags | l); usleep(1); port_out(lp, 128 | flags | l);
#ifndef USE_SHIFT_REG
port_out(lp, displayID | flags | h);LCD_Pause(1);
port_out(lp, flags | h);
port_out(lp, displayID | flags | l);LCD_Pause(1);
port_out(lp, flags | l);
#else
shiftreg(displayID,flags|h);
shiftreg(displayID,flags|l);
/*all actions take at least 40us to execute TODO:instead of delay read keys here */
#endif
LCD_Pause(50);
}
/////////////////////////////////////////////////////////////////
@@ -73,7 +164,7 @@ int HD44780_init(lcd_logical_driver *driver, char *args)
char *argv[64];
int argc;
int i;
char displayID = LCDEN|SECONDLCDEN;
HD44780 = driver;
@@ -125,7 +216,7 @@ int HD44780_init(lcd_logical_driver *driver, char *args)
// Set up io port correctly, and open it...
if ((ioperm(port,1,1)) == -1) {
if ((ioperm(port,2,255)) == -1) {
fprintf(stderr, "HD44780_init: failed (%s)\n", strerror(errno));
return -1;
}
@@ -133,18 +224,35 @@ int HD44780_init(lcd_logical_driver *driver, char *args)
lp = port;
// init HD44780
port_out(lp, 128 | EN | 3); usleep(1); port_out(lp, 128 | 3); usleep(5000);
port_out(lp, 128 | EN | 3); usleep(1); port_out(lp, 128 | 3); usleep(150);
port_out(lp, 128 | EN | 3); usleep(1); port_out(lp, 128 | 3);
#ifndef USE_SHIFT_REG
port_out(lp,displayID | 3); LCD_Pause(4100);
port_out(lp,displayID | 3); LCD_Pause(100);
port_out(lp,displayID | 3); LCD_Pause(40);
// now in 8-bit mode... set 4-bit mode
port_out(lp, 128 | EN | 2); usleep(1); port_out(lp, 128 | 2);
// now in 4-bit mode... set 2 line, small char mode
HD44780_senddata(0, 32 | 8);
port_out(lp,displayID | 2); LCD_Pause(40);
#else
shiftreg(displayID,3);
LCD_Pause(4100);
shiftreg(displayID,3);
LCD_Pause(100);
shiftreg(displayID,3);
LCD_Pause(40);
shiftreg(displayID,2);
LCD_Pause(40);
#endif
// now in 4-bit mode...
// set display type function set(32) data8/4 (16) set 2 line(8), small char mode(4)
HD44780_senddata(displayID,0, 32 | 8 | FONTSIZE);
//clear
HD44780_senddata(0, 1);
HD44780_senddata(displayID,0, 1);LCD_Pause(1600);
// set lcd on (4), cursor_on (2), and cursor_blink(1)
HD44780_senddata(0, 8 | 4 | 0 | 0);
HD44780_senddata(displayID,0, 8 | 4 | 0 | 0);LCD_Pause(1600);
// Set display-specific stuff..
//HD44780_linewrap(1);
@@ -181,8 +289,11 @@ int HD44780_init(lcd_logical_driver *driver, char *args)
driver->set_char = HD44780_set_char;
driver->icon = HD44780_icon;
driver->draw_frame = HD44780_draw_frame;
driver->getkey = NULL;
#ifndef USE_SHIFT_REG
driver->getkey = NULL;
#else
driver->getkey = HD44780_getkey;
#endif
return lp;
}
@@ -202,12 +313,27 @@ void HD44780_close()
static void HD44780_position(int x, int y)
{
int val = x + (y%2) * 0x40;
if (y>=2) val += 20;
HD44780_senddata(0,128|val);
if ((y%4)>=2) val += lcd.wid;
if (lcd.hgt==1) val += (x%8) * (0x40-8); //cope with 16x1 display
#ifndef SPLIT_SCREENS
HD44780_senddata(LCDEN,0,128|val);
#else
if (y<(lcd.hgt/2))
{
if (lcd.hgt==2) val += (x%8) * (0x40-8);// two 16x1 displays
HD44780_senddata(LCDEN,0,128|val);
}
else
{
val = x + ((y-(lcd.hgt/2))%2) * 0x40;
if (((y-(lcd.hgt/2))%4)>=2) val += lcd.wid;
if (lcd.hgt==2) val += (x%8) * (0x40-8);// two 16x1 displays
HD44780_senddata(SECONDLCDEN,0,128|val);
}
#endif
lcd_x = x;
lcd_y = y;
}
void HD44780_flush()
@@ -224,11 +350,23 @@ void HD44780_flush_box(int lft, int top, int rgt, int bot)
for (y=top; y<=bot; y++) {
HD44780_position(lft,y);
//printf("\n%d,%d :",lft,y);
for (x=lft ; x<=rgt ; x++) {
HD44780_senddata(RS,lcd.framebuf[(y*20)+x]);
if ((lcd.hgt==1)&&(x==8)) HD44780_position(x,y);
//cope with 16x1 display
#ifdef SPLIT_SCREENS
if ((lcd.hgt==2)&&(x==8)) HD44780_position(x,y); //two 16x1's
if (y<(lcd.hgt/2))
HD44780_senddata(LCDEN,RS,lcd.framebuf[(y*lcd.wid)+x]);
else
HD44780_senddata(SECONDLCDEN,RS,lcd.framebuf[(y*lcd.wid)+x]);
//printf("%c",lcd.framebuf[(y*lcd.wid)+x]);
#else
HD44780_senddata(LCDEN,RS,lcd.framebuf[(y*lcd.wid)+x]);
#endif
}
//write(fd, lcd.framebuf[(y*20)+lft, rgt-lft+1]);
//write(fd, lcd.framebuf[(y*lcd.wid)+lft, rgt-lft+1]);
}
}
@@ -263,7 +401,8 @@ static void HD44780_linewrap(int on)
//
static void HD44780_autoscroll(int on)
{
HD44780_senddata(0,4 | on * 2);
HD44780_senddata(LCDEN|SECONDLCDEN,0,4 | on * 2);
LCD_Pause(1600); //this can take time to do on some displays
}
@@ -482,7 +621,7 @@ void HD44780_set_char(int n, char *dat)
if(n < 0 || n > 7) return;
if(!dat) return;
HD44780_senddata(0, 64 | n*8);
HD44780_senddata(LCDEN|SECONDLCDEN,0, 64 | n*8);
for(row=0; row<lcd.cellhgt; row++) {
letter = 0;
@@ -490,7 +629,7 @@ void HD44780_set_char(int n, char *dat)
letter <<= 1;
letter |= (dat[(row*lcd.cellwid) + col] > 0);
}
HD44780_senddata(RS, letter);
HD44780_senddata(LCDEN|SECONDLCDEN,RS, letter);
}
}
@@ -550,13 +689,52 @@ void HD44780_draw_frame(char *dat)
if (!dat) return;
for (y=0; y<=3; y++) {
for (y=0; y<lcd.hgt; y++) {
HD44780_position(0,y);
for (x=0 ; x<=19 ; x++) {
HD44780_senddata(RS,dat[(y*lcd.wid)+x]);
//printf("\n%d :",y);
for (x=0 ; x<lcd.wid ; x++) {
if ((lcd.hgt==1)&&(x==8)) HD44780_position(x,y);//for 16x1
#ifdef SPLIT_SCREENS
if ((lcd.hgt==2)&&(x==8)) HD44780_position(x,y);// two 16x1's
if (y<(lcd.hgt/2))
HD44780_senddata(LCDEN,RS,dat[(y*lcd.wid)+x]);
else
HD44780_senddata(SECONDLCDEN,RS,dat[(y*lcd.wid)+x]);
//printf("%c",dat[(y*lcd.wid)+x]);
#else
HD44780_senddata(LCDEN,RS,dat[(y*lcd.wid)+x]);
#endif
}
}
}
#ifdef USE_SHIFT_REG
char HD44780_getkey()
{
// TODO: a keypad scan that does not use shift register
// define a key table
char keytr[]="ABCDEFGH";
int n;
rawshift(0);LCD_Pause(1); //send all line on shift register low
if ((port_in(lp+1)&32)==0) //test if line back is low - if not return(0)
{ //else
//start walking a single zero across the eight lines
for(n=7;n>=0;n--)
{
rawshift(255 - (1<<n));LCD_Pause(1);
if ((port_in(lp+1)&32)==0) // check if line back is low if yes debounce
{
if (lastkey==keytr[n])
return(0);
// printf("key is %c %d\n",keytr[n],n);
lastkey=keytr[n];
return(keytr[n]); //return correct key code.
}
}
} //else fall out and return(0) [too transient a keypress]
lastkey=0;
return(0);
}
#endif