A Little surprise with PbP 2.50 ...

[Luciano]

Hi Alain,

I understand that you have a problem when you compile

LCDOUT $FE,$C0," ", SDEC2 Tair,"°C "

where the degree symbol is not correctly translated in
the corresponding LCD character.

Are you sure that during the source code parsing the compiler
gets the correct character? This is why I suggested to try on
a 100% English United States system.

Best regards,

Luciano

[Acetronics2]

Luciano,

There was no problem with 2.47 release

so, Understand that is not my problem ... but melabs' !!!

I've had a quick look to see if I could debug it by myself ... just found the problem occurs with > 127 ASCII input ( keyboard ) values.

I'm just a system user ... and my computer knowledge stops at the letters stamped on my keyboard !!!

Alain

[Bruce]

ASCII characters with the high bit set are extended ASCII codes. As far as I know, all
compilers that accept ASCII codes between the double quotes only work with standard
ASCII codes. Not extended codes.

I have tried your example with extended ASCII codes "°öµC" with versions 2.47 and 2.5
of PBP, another BASIC compiler, and two C compilers. They all output the same garbage
where each extended ASCII character is between the quotes. All non extended codes
print as expected.

PBP 2.50 seems to be the only compiler that shows the warning, but they all print junk
on my LCD where extended ASCII codes are located in the string, between the "".

Did you get PBP v2.47 to actually print these extended ASCII characters "as shown", in
between the " " on your LCD, or did it just not throw the warning?

I'm just curious because I get the same results with 5 different compilers.

[Acetronics2]

Hi, Bruce

... I've used a lot of DS1820 temp monitors without noticing anything for years.

BUT ... having a further look to those programs, I notice I've ever used the HEX value ( $DF ) ... instead of the " ° " Keyboard input ...

a try ( 2.47 and 2.50 ) gives not garbage ... but characters from the 128-256 code section of the characters map.

And now, we've a Warning !!!


One more notice to add to my poor old manual ... there might be a blank page between two command ones ... to add one's comments. LOL.


So, Let's keep in mind that Complementary table can only be accessed sending HEX Values ... like here:

Lcdout $fe, 1, DEC (temperature / 100), ".", DEC2 temperature, " ",$DF,"C"

Alain

PS : Pfouuuuu, I was not so far from the RTFM !!! ...

[Bruce]

Hi Alain,

It is a bit confusing I guess, but maybe this will help explain it.

When you place the degree symbol inside quotes like this "°" the value gets converted to
$B0.

If you send $B0 to a terminal program like this: HSEROUT [$B0] it will display the ° symbol.
If you try this with LCDOUT, the value of $B0 displays a - symbol. Which is what it should
be if you look at the LCD data sheet.

You can use extended ASCII characters like "°öµC" with no problem if sending it to an ASCII
terminal program, and it displays each character just fine. It's just no going to produce what
you might expect when formatting data like this for an LCD display. The compiler "assumes"
data is being formatted for an ASCII terminal.

HSEROUT ["º°A",13,10] ' prints º°A to an ASCII terminal. These were entered with ALT 167,
and ALT 248 on the numeric keypad.

LCDOUT $FE,$C0,"º°A" ' produces ]-A on an LCD, but LCDOUT $FE,$C0,"[]{}!@#$%^&*()_+"
prints everything as shown.

Why 2.5 throws the warning up I'm not sure, but it's probably something they should look
into. Or at least indicate in the manual that ASCII codes >127 aren't supported in quotes.

[Acetronics2]

Hi, Bruce,

thanks for your enlightments.

find here the answer from Melabs :

"
For special characters such as this, it is better to specify the
character using its numeric ASCII code. I believe this will work:

LCDOUT $FE,$C0," ", SDEC2 Tair, $B0, "C "

I believe you could ignore the warning and the display would be
correct, but it's always a good idea to resolve warnings as they come
up.

Charles Leo
microEngineering Labs, Inc. "

Solution confirmed ... and thanks to melabs.

Alain

[Bruce]

Assuming Tair = 32d;

Which version prints 32°C on your LCD?

LCDOUT $FE,$C0," ", SDEC2 Tair, $B0, "C "

or;

LCDOUT $FE,$C0," ", SDEC2 Tair, $DF, "C "

or;

LCDOUT $FE,$C0," ", SDEC2 Tair, 223, "C "

[MarioC]

Hi, Bruce,

thanks for your enlightments.

find here the answer from Melabs :

"
For special characters such as this, it is better to specify the
character using its numeric ASCII code. I believe this will work:

LCDOUT $FE,$C0," ", SDEC2 Tair, $B0, "C "

I believe you could ignore the warning and the display would be
correct, but it's always a good idea to resolve warnings as they come
up.

Charles Leo
microEngineering Labs, Inc. "

Solution confirmed ... and thanks to melabs.

Alain

Taking note.....