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Date: Mon, 24 Oct 2011 21:41:42 +0200
Message-ID: <CAK7bL3ym8MsJ7wbHDC28a03A8Rkui0zbhvVCW6Qa05pAUgMfLQ@mail.gmail.com>
Subject: [gentoo-embedded] Atmega issue since reinstallation of cross-avr/gcc
From: Jean-Marc Beaune <jm.beaune@gmail.com>
To: gentoo-embedded@lists.gentoo.org
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Hi,
Not easy to explain but I'll gi ve a go.
I programed an atmega328p to read temperature and send it via USART. That
worked fine untill I changed my laptop.
After changing my computer (and therefore reinstalling cross-avr/gcc), then
a part of a function used to read the temperature doesn't work anymore, i.e.
it compiles fine but the atmega doesn't send anything via USART, the program
dumps.
I narrowed down the problem and it seems to be a problem when doing some
calculation in a function:
All variables below are declared as uint8_t
The return statement below causes the program to crash:
return (double) temp_LSB - 0.25 + (double)(count_per_c - count_remain) /
count_per_c;
The return statement below causes the program to crash also:
return (double) temp_LSB - 0.25;
The return statement below is OK:
return (double)(count_per_c - count_remain) / count_per_c;
Since it coincides with a change of computer used to compile the program I
wonder if it could be a missing flag/option for cross-avr/gcc?
Any advice appriciated,
Thank you
--
Jean-Marc
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Hi,<div><br></div><div>Not easy to explain but I'll gi ve a go.</div><d=
iv><br></div><div>I programed an atmega328p to read temperature and send it=
via USART. That worked fine untill I changed my laptop.</div><div><br></di=
v>
<div>After changing my computer (and therefore reinstalling cross-avr/gcc),=
then a part of a function used to read the temperature doesn't work an=
ymore, i.e. it compiles fine but the atmega doesn't send anything via U=
SART, the program dumps.</div>
<div><br></div><div>I narrowed down the problem and it seems to be a proble=
m when doing some calculation in a function:</div><div><br></div><div>All v=
ariables below are declared as uint8_t</div><div><br></div><div><div>The re=
turn statement below causes the program to crash:</div>
<div>return (double) temp_LSB - 0.25 + (double)(count_per_c - count_remain)=
/ count_per_c;</div><div><br></div><div>The return statement below causes =
the program to crash also:</div><div>return (double) temp_LSB - 0.25;</div>
<div><br></div><div>The return statement below is OK:</div><div>return =A0(=
double)(count_per_c - count_remain) / count_per_c;</div><div><br></div><div=
>Since it coincides with a change of computer used to compile the program I=
wonder if it could be a missing flag/option for cross-avr/gcc?</div>
<div><br></div><div>Any advice appriciated,</div><div>Thank you</div><div><=
br></div>-- <br>Jean-Marc<br>
</div>
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