Code size limit MSP430F6638

Krutarth Trivedi

Other Parts Discussed in Thread: MSP430F6638

I'm using the MSP430F6638 chip and a licensed version of CCS. I have a 63 KB main.c file. I just got an error in CCS while compiling telling me that the code size limit has been exceeded. It was working fine just a minute ago before I added a few lines of code. So I commented those lines of code out and re-compiled and the error is gone. So, it seems it seems the compiler is counting the lines of code to be executed and throwing an error if a threshold is exceeded. My code is just ~1800 lines or so (with comments). I checked the datasheet and the flash is 256 KB on this MCU. So...I'm wondering why I'm getting this error?

over 14 years ago

0 old_cow_yellow over 14 years ago

Guru 58965 points

They do not count the number of source code lines. They count the total number of object code bytes. This include the library functions you used (and they supplied). Things like printf(), floating-point, etc, are very big. Inefficient compilation also generates larger than necessary object code. All these add up and are counted against you. The "few lines of code" you added broke the camel's back.

0 Jens-Michael Gross over 14 years ago

Guru 227245 points

This error message usually comes when you use the free/trial version and you code exceeds the allowed maximum size. However, with 1800 lines of code, i don't think this is the case.

If the code is too large for the target device, you usually get a linker error about segment placement, but not about code size limit.

cyn you post the EXACT error message? And its surroundings?

Krutarth Trivedi said:
the flash is 256 KB on this MCU

And you're usign large cod emodel? If not, only the portion below 64k can be used, as all funciton calls are 16 bit addresses only (but the code is smaller and faster)