Rewriting putchar() on MSP430F149

I think, that only reasonable way to make terminal connection between
MSP430F149 <-> PC, is to rewrite low-level fuction putchar() to use
USART and let upper-level functions like printf() to make all the
conversions needed.
I'm using IAR and/or mspgcc. How do I replace putchar.o in library
files needed, and what are those lib-files in both systems?

ispe@luukku.com wrote:
> I think, that only reasonable way to make terminal connection between
> MSP430F149 <-> PC, is to rewrite low-level fuction putchar() to use
> USART and let upper-level functions like printf() to make all the
> conversions needed.
> I'm using IAR and/or mspgcc. How do I replace putchar.o in library
> files needed, and what are those lib-files in both systems?
> 


I use uprintf() which sends output one character at a time to a 
designated function. In my case the designated function is one I wrote 
myself and contains low level code to push characters out through the 
UART. I have this function in my program so it is not a library as such.

My print statements look like this:
uprintf(my_designated_function, "Hello world" );

Let me know if you would like more detail.

Regards
JC

ispe@luukku.com wrote:

> I think, that only reasonable way to make terminal connection
> between MSP430F149 <-> PC, is to rewrite low-level fuction putchar()
> to use USART and let upper-level functions like printf() to make all
> the conversions needed.
> I'm using IAR and/or mspgcc. How do I replace putchar.o in library
> files needed, and what are those lib-files in both systems?

With IAR putchar() calls some function _cantrember(), IIRC.
This function can be declared anywhere in your project.

It must be somewhere in the IAR help. I don't have IAR at home, but I
will look it up at work tomorrow (if I don't forget ;-)

/Jan-Hinnerk

It is quite easy, and documented in the configuration section of the C
compiler reference manual.  The putchar() function calls
__low_level_put() into which you put your serial transmit function
call.  In my case:

static void __low_level_put( int Character )
{
USART_0_TX_Char( (unsigned char) Character ) ;
}

IAR have an app note on the web site that covers the use of the serial
port quite comprehensively and includes the implementation of a
buffered, interrupt driven serial interface.

Ian