How to look at floating-point number calculation result with EWARM

Ken Inoue · ‎2017-11-09

Posted on November 09, 2017 at 10:11

Thank you for your patronage. I'm using STM32F3348-Discoverywhich has FPU and EWARM.

I made calculations like the picture below.

I'd like to check if floating point arithmetic is calculated correctly. So,I added z to EWARM live watch. Butz indicated an error.In case of integer operation, it is correctly displayed.How can I do it?

Best Regards,

Ken Inoue

Andrew Neil · ‎2017-11-09

Posted on November 09, 2017 at 10:39

Having paid the considerable licence fee for EWARM, don't you think you should be asking them about difficulties with their product ... ?!

https://www.iar.com/support/technical-support/

But, anyhow, what is the text following 'Error(...' in your screenshot?

General points - not specific to IAR:

Is z in-scope at the point you are trying to observe it?
Is the value of z ever used for anything non-trivial?
If not, the compiler may well have optimised it away...

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

View solution in original post

Andrew Neil · ‎2017-11-09

Posted on November 09, 2017 at 10:39

Having paid the considerable licence fee for EWARM, don't you think you should be asking them about difficulties with their product ... ?!

https://www.iar.com/support/technical-support/

But, anyhow, what is the text following 'Error(...' in your screenshot?

General points - not specific to IAR:

Is z in-scope at the point you are trying to observe it?
Is the value of z ever used for anything non-trivial?
If not, the compiler may well have optimised it away...

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Ken Inoue · ‎2017-11-09

174712CGIL2

Andrew Neil · ‎2017-11-09

Posted on November 09, 2017 at 12:10

Do you understand the concept of scope in the 'C' programming language?

A variable is not visible outside its scope - not even to a debugger ...

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Ken Inoue · ‎2017-11-09

Posted on November 09, 2017 at 12:37

I will study that.

Thanks.

Best Regards,

Ken Inoue