Build problem with #pragma vector in imported Energia sketch

John Wygonski

Intellectual 870 points

Other Parts Discussed in Thread: ENERGIA

I have the following interrupt definition in an Energia sketch imported into CCS:

#pragma vector=PORT3_VECTOR

__interrupt void PORT3_ISR_HOOK(void) {

...

}

I get a warning:

warning: malformed '#pragma vector' - ignored [-Wpragmas]

building with CCS 6.1.3 on two PCs, But no errors on at least 4 other PCs. The ISR doesn't fire on builds with this warning.

I have not been able to find out why this warning occurs on some machines and not others.

This post says not to use #pragma with GCC, but I followed the advice and used

void __attribute__((interrupt(PORT3_VECTOR))) PORT3_ISR_HOOK(void)

but got the error

error: 'PORT3_VECTOR' was not declared in this scope

over 10 years ago

0 John Wygonski over 10 years ago

Intellectual 870 points

Updating my post, I should have added that the warning does not appear with CCS 6.1.0. Same MSPGCC compiler GNU v4.6.3.

0 Clemens Ladisch over 10 years ago

Guru 327860 points

"pragma vector" is used only by the other compilers. When using gcc, you must use the interrupt attribute instead.

The PORT3_VECTOR symbol is defined in the header file for your MCU (<msp430.h>).

0 John Wygonski over 10 years ago in reply to Clemens Ladisch

Intellectual 870 points

Thanks, I saw your similar reply in the other post. But the "pragma vector" works when I build under CCS 6.1.0? I must be missing something obvious here. I realize I can use the interrupt attribute and simply fix the undefined symbol, but my client is wondering why the build works in some environments but not others with the same compiler being used.

0 Clemens Ladisch over 10 years ago in reply to John Wygonski

Guru 327860 points

Does it actually work? I'd guess that the warning is just suppressed by some compiler option.

0 John Wygonski over 10 years ago in reply to Clemens Ladisch

Intellectual 870 points

Good question--I'm told that the interrupt fires on the target hardware when the build doesn't flag that warning. Following up, I have seen the "#pragma vector=" in many other Energia code snippets.

The only obvious difference in compiler switches between two imported projects is "-DENERGIA=16" for the build that fails vs. "-DENERGIA=13" for the build that doesn't flag an error (Even though Energia v16 is installed on both PCs. Maybe this is a CCS import issue or an Energia issue?

0 John Wygonski over 10 years ago in reply to Clemens Ladisch

Intellectual 870 points

Clemens,
I was able to remove the warning about #pragma vector=PORT3_VECTOR
by moving the #includes for msp430.h and energia.h to thte top of the main ".ino" file.
I don't know why that worked, though.

0 John Wygonski over 10 years ago in reply to Clemens Ladisch

Intellectual 870 points

I do appreciate the recommendation to use the interrupt attribute. It was in doing this that I discovered that the order of #includes mattered.

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Build problem with #pragma vector in imported Energia sketch