C++ has never been officially supported by mspgcc, and this appears to
require a change to the compiler rather than simple header modification:
C++ apparently does something unexpected with attribute merges.
I've confirmed the behavior. Please enter this as a bug at
https://sourceforge.net/p/mspgcc/bugs/. If there is another mspgcc release
I'll may be able to fix it then.
Peter
On Mon, Sep 9, 2013 at 2:45 PM, Andrew Wygle awy...@berkeley.edu wrote:
After further investigation, I discovered that this code is actually being
compiled as C++. This explains the difference in our experience, but not
the error itself. A minimally reproducible example:
#include msp430.h
#include stdint.h
int main(int argc, char *argv[]) {
uint8_t addr = 0x02;
P4OUT |= addr;
return 0;
}
Compiled with:
msp430-g++ -mmcu=msp430fr5969 -c error.cpp -Os
On Fri, Sep 6, 2013 at 11:35 AM, Peter Bigot big...@acm.org wrote:
I'm unable to duplicate that with the following program using msp430-gcc
-Os -mmcu=msp430fr5969 -c x.c and similar variants.
The attributes are documented at
https://sourceforge.net/apps/mediawiki/mspgcc/index.php?title=Gcc47:20-Bit_Designbut
it should not be necessary for you to be aware of them for this sort of
code.
Peter
#include msp430.h
#include stdint.h
extern uint8_t v;
int doit ()
{
P4OUT |= v;
return 1;
}
On Fri, Sep 6, 2013 at 12:14 PM, Andrew Wygle awy...@berkeley.eduwrote:
Hello all,
I'm new to this list, I've been using mspgcc to develop for the new
MSP430FR5969 (the 64k FRAM MSP), and I recently ran into an error when
trying to assign to port 4 of that device.
The line of code is:
P4OUT |= var;
where var is an 8-bit unsigned integer less than 8 in this particular
case.
The reported error is:
error: merged types have inconsistent d16/d20 attributes.
This would seem to indicate some kind of data type width error. This is
born out by the fact that if I change var to be an unsigned 16-bit
integer,
the assignment works just fine. However, P4 should be an 8-bit (byte)
wide
port. I'd never seen the d16/d20 notation before, and I wasn't able to
find
any information on it through Google, so I'd like to hopefully understand
what I'm doing wrong and why I'm seeing this error.
Thanks for the assistance.
~Andrew Wygle
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