Talkback for article: 286, March2003

Linux USB LCD display with watchdog and buttons

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From: Andrew [ date: 2003-03-11 ]
I would like to point out that Cwlinux LCD is a graphical LCD which can also display 4x20 in a 5 1/4 drive bay. Besides, it comes with a mounting bracket and 6 keys keypad. If you add all these options up together, this solution is not as expensive as you think. FYI, usb cw12232 didn't change the original Product ID which is compatible with pl2303.
From: Mike Durller <mikedlt(at)> [ date: 2003-03-14 ]

This is a cool chip... 3M baud maximum speed?! I wonder if this would
be a good choice for a Amateur radio packet modem...

From: AUBRY Jean-MARC <aubry.jeanmarc(at)> [ date: 2003-03-24 ]
Another very very good article
From: Markus Ermert [ date: 2003-04-01 ]
Nice article, indeed.
FYI, if you don't have the means to produce the PCB yourself:
the electronic magazin Elektor has featured the same FTDI chip
in its recent german issue. They presented a small double sided board including a RS232 level converter. You could connect this board then
to your original RS232 LCD....
From: Inky [ date: 2003-04-29 ]
I bet Cwlinux has a cheaper version of USB LCD provided recently. It looks cool and cheap....
From: Adrian Freisinger <agfreisinger(at)> [ date: 2003-10-27 ]
Hi master
I can´t find the articule :Programming the AVR Microcontroller with GCC, March 2002 article, the link is broken.
From: guido [ date: 2003-10-27 ]
Hello Adrian Freisinger,
the article is not translated to spanish yet. Use
the English version.
From: Brian M. <morlenxus(at)> [ date: 2003-10-29 ]
Hi guido!

I got problems with the firmware. Installed the newes gcc and binutils for avr (everything works fine) but when i want to compile your linuxusblcd-1.0 i got errors:

1. I got errors about the includes, it says, i should bettter use avr/io.h then io.h, same on progmem... I patched all thoose includes, and he compiles, but then i got this error:

avr-gcc -mcall-prologues -Os -mmcu=at90s4433 -Wall -Wstrict-prototypes -c lcd.c
lcd.c: In function `lcd_write':
lcd.c:119: error: invalid lvalue in unary `&'
lcd.c:119: error: invalid lvalue in unary `&'
lcd.c:119: error: invalid lvalue in unary `&'
lcd.c:119: error: invalid lvalue in unary `&'
lcd.c:144: error: invalid lvalue in unary `&'
lcd.c:144: error: invalid lvalue in unary `&'
lcd.c:144: error: invalid lvalue in unary `&'
lcd.c:144: error: invalid lvalue in unary `&'

... a few more lines more...

Any help? Would be fine if you can mail me...


From: Avérous [ date: 2003-12-04 ]
I'm French man. This article is very good. I use an macintosh with OS X. This new OS is bases on an unix kernel. The gcc compiler is installed, then do you think that is possible to make an article for mac user ?

I know this place is an lunix's website, but we have the same kernel...

Thank you in advance.
From: evilgeek [ date: 2004-04-28 ]
OS X uses a BSD kernel which is no where close to a linux kernel!!!!
From: Daniel Serrano <Daniel_S_I(at)> [ date: 2004-06-21 ]
Can I use the "unused" pins? It is possible to add more buttons using there? How?
From: Daniel Serrano <Daniel_S_I(at)> [ date: 2004-06-25 ]
Para todos los lectores españoles:
Tanto el chip microcontrolador, como el FT232BM se pueden encontrar en, aunque en el momento de escribir esto no tienen existencias
From: jroh pikee <se_jroh(at)> [ date: 2004-11-18 ]
Hi,, it is interest page,, thank so much Guido Socher,,
anyway i would like to understand using usb for data acquisition,, could you help me about??


From: Egor <TzarEgor(at)> [ date: 2005-12-08 ]
Hello Guido !

I'm from Ukraine. I'm interesting in automation(home automation) and robots.
I have created my first device using your articles
and everything is working ok ! I like your articles because thay always are so simply to understand and have everything I need to try repeat your steps by myself.

Thanks a lot !


PS: If it is possible, could you please write the article about CAN and Avr microcontrollers in future?
What do you think about the home-automation in general ?
From: Niranjan <niranjan_one(at)> [ date: 2006-08-10 ]
hi all
when i am using gmake then i got this eeror and alo code where i got error error: invalid lvalue in unary '&'
error_code = atof_generic
(& const_cast<const char *>(input_line_pointer), ".", EXP_CHARS,
& generic_floating_point_number);
how to modify this code to solve this problem
can anyone help me ?
From: suisSteph [ date: 2006-10-19 ]
Hi Niranjan,

I have had the same error and I have solved it so:

error_code = atof_generic (input_line_pointer, ".", EXP_CHARS, & generic_floating_point_number);

Hope it help, you or others!


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