Re: [Sdcc-user] Setting up and sending serial messages

[Jean-Paul <tch...@fr...>]

Hi,

Your AT89C2051 works fine. So do your putchar routine and all that stuff.
In fact, it looks like you want to write on your serial LCD as you would =
=20
do on a terminal.
I suppose you have to send an address to your LCD: row and character =20
positions.
It could be that you need to do that with every character, or you can =20
configure you LCD to increment automatically the write position.
What is the type of your serial LCD, where can I find its manual or data =
=20
sheet?

Regards
Jean-Paul


On Fri, 17 Jun 2005 18:48:43 -0700 (PDT), J S <g1p...@ya...> wrot=
e:

> Hi All,
>
> I know this is prolly a very simple question for all
> you experts out there, but how do you setup serial
> communictaions with sdcc when using an AT89C2051
> controller?  I tried playing with some examples I
> have, but they are all for Keil and don't seem to be
> working.
>
> My basic goal is to send a "test" message to a serial
> LCD display that requires 9600 baud rate and a 8 bit
> data and 1 bit stop transmission with no parity.  I
> wrote this up to initialize the serial communication:
>
> SCON=3D0x50;
> TMOD=3D0x20;
> TH1=3D0xFD;
> TR1=3D1;
> T1=3D1;
>
> This combination seems to be ok, as I can send one
> letter to the display by:
>
> SBUF=3D'T';
>
> But, if I send another letter that way, it just erases
> the previous one.  I thought this might have something
> to do with the display so I then sent a specific
> command for it to shift the cursor over by one, but it
> still didn't help.
>
> Also, I did try to use printf_tiny but every time I
> use it, I get a link warning:
>
> ?ASlink-Warning-Undefined Global '_putchar' referenced
> by module 'printf_tiny'
>
> And if I tried programming the 2051 even with that
> warning, it won't work.
>
> Not sure what I'm doing wrong, so any help would be
> appreciated :-)
>
> Thanks,
> J Silverman
>
>
> 	=09
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