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

[J S <g1p...@ya...>]

Hi Peter

--- Peter <pl...@ac...> wrote:
> 
> Did you try to send data as I wrote, using TI checks
> ? 

Yes, this is the code I used for putchar:

void putchar(char ch)
{
    while(!T1) ;
    T1=0;
    SBUF=ch;
}

I had to change it a bit from what you wrote because
the header file from sdcc defined putchar as void with
a char input.

> According to the 
> datasheet if you did this then it should work. Try
> to send a 0x14 (shift 
> cursor right) between each character and see what
> happens. 

Yep, already tried it.  It didn't have any affect
though.

> Your serial 
> lcd could have a bug. When programming standard lcds
> then your problem 
> occurs if one does not set the lcd mode to
> auto-increment on write. That 
> would be a firmware bug in your case. Try to send
> 0x1b 0x43 (enable 
> scrolling) then send data bytes, see what happens.

Ok, just tried this, but now I'm not getting anything
on the screen except the cursor.

> There is one more way 
> to enable auto-increment on write, as a last resort:
> 0x11 0x18 0x11 0x04 
> . When you send these bytes, and in fact ANY bytes
> to SBUF, you wait for 
> TI between them as shown in my previous email, ok ?

Yup, I have the T1 check setup in putchar and similar
for any other time I use SBUF.  However, I think this
is where the problem is. I think it sends out the
first byte, then when it goes to the second byte, it
stays in the loop checking T1.  This can explain why I
only see the first character now.  Not sure why its
doing this.

Thanks,
J Silverman


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