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Re: [lcd4linux] HD44780 20x2 only shows 8 characters
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From: Joao B. <bon...@ya...> - 2011-12-04 20:07:40
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So I downloaded the source code from svn and started looking at the HD44780 driver.
I did a small change in there and now I get all 20 characters on line 1 to display. But a widget in line 2 won't display at all.
Also, as text in widget 1 changes, it will wrap into line 2.
Basically, I changed this line in the goto() function into this:
drv_HD_command(currController, (0x80 | 15), T_EXEC);
The changes I made in drv_HD44780.c are:
static int drv_HD_goto(int row, int col)
{
int pos, controller;
/* handle multiple controllers */
for (pos = 0, controller = 0; controller < numControllers; controller++) {
pos += CROWS[controller];
if (row < pos) {
currController = (1 << controller);
break;
}
row -= CROWS[controller];
}
/* column outside of current display's width */
if (col >= CCOLS[controller])
return -1;
if (0) {
debug("goto: [%d,%d] mask=%d, controller=%d, size:%dx%d", row, col, cur$
CROWS[controller], CCOLS[controller]);
}
/* 16x1 Displays are organized as 8x2 :-( */
if (CCOLS[controller] == 16 && CROWS[controller] == 1 && col > 7) {
row++;
col -= 8;
}
if (Capabilities & CAP_HD66712) {
/* the HD66712 doesn't have a braindamadged RAM layout */
pos = row * 32 + col;
} else {
/* 16x4 Controllers use a slightly different layout */
if (CCOLS[controller] == 16 && CROWS[controller] == 4) {
pos = (row % 2) * 64 + (row / 2) * 16 + col;
} else {
pos = (row % 2) * 64 + (row / 2) * 20 + col;
}
} /* drv_HD_command(currController, (0x80 | pos), T_EXEC); */
drv_HD_command(currController, (0x80 | 15), T_EXEC);
/* return columns left on current display */
return CCOLS[controller] - col;
// return 20;
}
static void drv_HD_write(const int row, const int col, const char *data, const $
{
printf(" %s len is %d\n", data , len);
int space = drv_HD_goto(row, col);
if (space > 0) {
drv_HD_data(currController, data, len > space ? space : len, T_EXEC);
}
/* JLB - cusor was blinking */
drv_HD_command(allControllers, 0x0c, T_ONOFF);
}
Can anybody help on this?
Thanks
________________________________
From: Joao Bonina <bon...@ya...>
To: "lcd...@li..." <lcd...@li...>
Sent: Thursday, 1 December 2011, 2:07
Subject: Re: [lcd4linux] HD44780 20x2 only shows 8 characters
Can anybody give me some hints on how to to debug this?
________________________________
From: Joao Bonina <bon...@ya...>
To: "lcd...@li..." <lcd...@li...>
Sent: Tuesday, 29 November 2011, 22:46
Subject: [lcd4linux] HD44780 20x2 only shows 8 characters
Hello,
I'm trying a new lcd display, this time a CrystalFontz CFAH2002Y-PDI-ET (HD44780 compatible).
The problem is that it only shows 8 characters on line 1. If I send it more than 8 characters, nothing will show.
Also, can't get any widget to display on line 2.
the log and conf file are:
0# lcd4linux -Fvvq -f lcd4linux.conf
LCD4Linux 0.11.0-SVN-1092 starting
Dump of lcd4linux.conf:
Display 'HD44780-20x2'
Display:HD44780-20x2.Bits 8
Display:HD44780-20x2.Driver 'HD44780'
Display:HD44780-20x2.Model 'generic'
Display:HD44780-20x2.Port '/dev/parport0'
Display:HD44780-20x2.Size '20x2'
Display:HD44780-20x2.UseBusy 0
Display:HD44780-20x2.Wire.ENABLE 'STROBE'
Display:HD44780-20x2.Wire.ENABLE2 'GND'
Display:HD44780-20x2.Wire.GPO 'GND'
Display:HD44780-20x2.Wire.RS 'AUTOFD'
Display:HD44780-20x2.Wire.RW 'INIT'
Layout 'Default'
Layout:Default.Row1.Col1 'Make'
Layout:Default.Row2.Col1 'Make2'
Variables.counter 0
Variables.tick 2000
Widget:Make.align 'R'
Widget:Make.class 'Text'
Widget:Make.expression 'i1234567'
Widget:Make.update tick
Widget:Make.width 20
Widget:Make2.align 'R'
Widget:Make2.class 'Text'
Widget:Make2.expression 'i5867'
Widget:Make2.update tick
Widget:Make2.width 20
Widget:Time.active counter < 100
Widget:Time.class 'Timer'
Widget:Time.expression counter = counter+1
Widget:Time.update 2000
plugin_cfg.c: Variable counter = '0' (0)
plugin_cfg.c: Variable tick = '2000' (2000)
[DBus] Error connecting to the dbus session bus: /usr/bin/dbus-launch terminated abnormally without any error message
lcd4linux.c: initializing driver HD44780
HD44780: $Rev: 1066 $
HD44780: using model 'generic'
HD44780: using parallel port
HD44780: using 1 Controller(s)
HD44780: using 8 bit mode
udelay: using gettimeofday() delay loop
HD44780: using ppdev /dev/parport0
HD44780: wiring: DISPLAY:RS - PARPORT:AUTOFD (Pin
14)
HD44780: wiring: DISPLAY:RW - PARPORT:INIT (Pin 16)
HD44780: wiring: DISPLAY:ENABLE - PARPORT:STROBE (Pin 1)
HD44780: wiring: DISPLAY:ENABLE2 - PARPORT:GND
HD44780: wiring: DISPLAY:ENABLE3 - PARPORT:GND
HD44780: wiring: DISPLAY:ENABLE4 - PARPORT:GND
HD44780: wiring: DISPLAY:BACKLIGHT - PARPORT:GND
HD44780: wiring: DISPLAY:GPO - PARPORT:GND
HD44780: wiring: DISPLAY:GPI - PARPORT:GND
HD44780: wiring: DISPLAY:POWER - PARPORT:GND
HD44780: timing: CY = 1000 ns (default)
HD44780: timing: PW = 450 ns (default)
HD44780: timing: AS = 140 ns (default)
HD44780: timing: AH =
20 ns (default)
HD44780: timing: INIT1 = 4100 us (default)
HD44780: timing: INIT2 = 100 us (default)
HD44780: timing: EXEC = 80 us (default)
HD44780: timing: WRCG = 120 us (default)
HD44780: timing: CLEAR = 2250 us (default)
HD44780: timing: HOME = 2250 us (default)
HD44780: timing: ONOFF = 2250 us (default)
HD44780: not using busy-flag checking
HD44780: using 0 GPI's and 0 GPO's
initializing layout 'Default'
layout.c: Layout:Default: migrating 'row1.col1' to 'Layer:1.row1.col1'
layout.c: Layout:Default: migrating 'row2.col1' to 'Layer:1.row2.col1'
Creating new timer group (2000 ms)
widget 'Make': Class 'text', Parent '<root>', Layer 1, Row 0, Col 0 (to 0,20)
widget 'Make2': Class 'text', Parent '<root>', Layer 1, Row 1, Col 0 (to 1,20)
lcd4linux.c: starting
main loop
Conf file is:
Variables {
tick 2000
counter 0
}
Display HD44780-20x2 {
Driver 'HD44780'
Model 'generic'
UseBusy 0
Port '/dev/parport0'
Size '20x2'
Bits 8
Wire {
RW 'INIT'
RS 'AUTOFD'
ENABLE 'STROBE'
ENABLE2 'GND'
GPO 'GND'
}
}
Widget Make {
class
'Text'
expression 'i1234567'
width 20
align 'R'
update tick
}
Widget Make2 {
class 'Text'
expression 'i5867'
width 20
align 'R'
update tick
}
Widget Time {
class 'Timer'
expression counter = counter+1
active counter < 100
update 2000
}
Layout Default {
Row1 {
Col1 'Make'
}
Row2 {
Col1
'Make2'
}
Display 'HD44780-20x2'
Layout 'Default'
Will appreciate your help.
Kind regards,
Joao
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------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure
contains a definitive record of customers, application performance,
security threats, fraudulent activity, and more. Splunk takes this
data and makes sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-novd2d
_______________________________________________
Lcd4linux-users mailing list
Lcd...@li...
https://lists.sourceforge.net/lists/listinfo/lcd4linux-users |
