Theo,
Peter's code is spot on but obviously there is a little bit involved with
the initialisation due to hardware differences, clock rate etc.
When I started with SDCC a few years ago, getting RS232 I/O was my first
task so that I could use the STDIO libraries and I am happy to help if you
are still having trouble. I've got software code in C for transmitting
serial data as well if you are not using the built-in serial port. Email me
direct - design [at] clinchcom.com
SDCC rocks!
Regards
Graham Clinch
----- Original Message -----
From: "Peter Van Epp" <van...@sfu.ca>
To: <sdcc-user@lists.sourceforge.net>
Sent: Wednesday, October 05, 2011 8:57 PM
Subject: [!! SPAM] Re: [Sdcc-user] SDCC Compiler Issue
> On Wed, Oct 05, 2011 at 01:16:26PM -0400, Theo Tijssen wrote:
>> Hello! I have a simple program in C language that I was hoping to compile
>> in
>> the SDCC compiler so I could download it onto my 8051 microcontroller.
>> The
>> code is:
>> *
>> /* Hello World program */
>>
>> #include<stdio.h>
>>
>> main()
>> {
>> printf("Hello World");
>>
>> }*
>>
>> The issue I am having is when I compile this in SDCC, the error reads:
>> *?ASlink-Warning-Undefined Global '_putchar' referenced by module
>> 'vprintf'*
>>
>> I tried putting in a general putchar code but that didn't work, it just
>> gave
>> me more errors in the compiler. Do you know how to fix this or what we
>> need
>> to add to our code in order for the compiler to properly compile it? Any
>> help and/or suggestions are appreciated.
>>
>> Thanks in advance!
>
> You neet to provide a putchar that will use a suitable output
> channel for your hardware. Assuming the UART is already initialized (and
> if
> not you would need to add the code to initialize it before this gets
> called
> but that is hardware specific to your hardware) something like this should
> work.
>
> void putchar (char c) {
>
> while (!TI)
> ;
> TI = 0;
> SBUF = c;
> }
>
> main()
> {
>
> /* code to initialize the UART and set the baud rate here! */
>
> printf("Hello World");
>
> }
>
> Peter Van Epp
>
> ------------------------------------------------------------------------------
> 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. Business sense. IT sense. Common sense.
> http://p.sf.net/sfu/splunk-d2dcopy1
> _______________________________________________
> Sdcc-user mailing list
> Sdcc-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/sdcc-user
------------------------------------------------------------------------------
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. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2dcopy1
_______________________________________________
Sdcc-user mailing list
Sdcc-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sdcc-user
