topic Re: Avoid one special routine optimization in S32K

Avoid one special routine optimization

fanziyu — Fri, 05 Jan 2024 00:54:59 GMT

S32K144

S32 Design for Arm 2.2

Optimization Level (-O1)

After the Hall signal A is detected by the input capture function, it waits for about 6us before going to collect Hall signal B. I used a FOR loop to produce this 6us, so how do I prevent the compiler from optimizing away this FOR loop?

for(i=0; i<65535;i++）

{...}

Re: Avoid one special routine optimization

fanziyu — Fri, 05 Jan 2024 02:05:39 GMT

This method works well in S32K144 S32DS, is it theoretically applicable?

Re: Avoid one special routine optimization

davidtosenovjan — Fri, 05 Jan 2024 09:23:58 GMT

Yes, I have found it in certain presentation used following way: