Kinetis Design StudioのトピックRe: KDS and Preprocessor

KDS and Preprocessor

beng_ — Tue, 29 May 2018 11:27:18 GMT

I'm having a problem with KDS and the pre-processor, I'm not sure if it's me mis-understanding the pre-proxcessor or a bug in the pre-processor

I have the following defines:

#define TIME_ON_POWER 20 // Value is in seconds

#define US_PER_S (US_PER_MS * MS_PER_S)

#define S_TO_US(s) (US_PER_S * s)

They're used in a function such as

uint32_t variable = S_TO_US( 60 - TIME_ON_POWER );

In my mind that should evaluate to 40,000,000 however when I look at it via the debugger it evalutles as 59,999,980

To solve this I just put an extra pair of brackets around 60 - TIME_ON_POWER, this means

uint32_t variable = S_TO_US( (60 - TIME_ON_POWER) );

evaulautes to 40,000,000.

Is this a problem with the KDS pre-processor or is my thinking/understanding flawed?

Re: KDS and Preprocessor

ZhangJennie — Thu, 31 May 2018 06:02:57 GMT

Hi Ben,

How do you define macro US_PER_MS and MS_PER_S?
Can you please upload your demo project here thus we can check it directly?
Besides, please also send me your KDS version.

Thanks.

Have a great day,
Jennie Zhang

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Re: KDS and Preprocessor

beng_ — Thu, 31 May 2018 10:52:11 GMT

Sorry - I missed those defines.

#define US_PER_MS 1000

#define MS_PER_S 1000

Re: KDS and Preprocessor

ZhangJennie — Tue, 05 Jun 2018 11:39:37 GMT

Hi Ben,

Thanks for your reply.

I reproduced this problem on my side.and will report it to developer.

For the moment, please use the workaround you already found.

I will let you know as soon as I get any update from developer.

Thank you for bringing the problem to our attention.

Have a great day,
Jennie Zhang

Re: KDS and Preprocessor

beng_ — Wed, 06 Jun 2018 13:42:59 GMT

Thanks

Re: KDS and Preprocessor

ZhangJennie — Thu, 07 Jun 2018 02:04:37 GMT

Ben,

You are welcome.

Jennie.