[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [avr-gcc-list] sprintf problem

From: Parthasaradhi Nayani
Subject: Re: [avr-gcc-list] sprintf problem
Date: Tue, 24 Jan 2006 08:20:03 -0800 (PST)

Hello all,
The problem resurfaced after little more code is added to my program. Optimisation is set to s. Sprintf behaves funny with %f. I am giving below sample code and the output

unsigned char buffer[100];

sprintf (buffer,"Hello %f hello\n\r", 34.56);
send_2_serial (buffer);

the output for the first two times is correct

Hello 34.56 hello

Before  every output some other reasonably large calculations are carried

Hello 34.56 hello

Hello  hello

The float converted string is missing.

Could anybody throw some light on why this is happening? Thanks in advance.

Nayani P

On 1/18/06, Parthasaradhi Nayani wrote:
> Hello all,
> In one of my projects (ATMega128 based) I am using floating point numbers
> and sprintf to write a formatted record to a buffer. Tthe buffer contents is
> then sent to a mini printer. The first two records print properly and
> thereafter I am getting garbage from sprintf!! The optimisation was set to
> 0. When I change the optimisation to s, then correct data is being printed!!
> Moreover there is a difference in the way _delay_loop_2 and _delay_loop_1
> delays are generated with different optimisations. I would like to know the
> reason why this is happening (specially with sprintf) to avoid any pitfalls
> in my coding. Thanks in advance.

Yahoo! Photos
Ring in the New Year with Photo Calendars. Add photos, events, holidays, whatever.
reply via email to

[Prev in Thread] Current Thread [Next in Thread]