MCUXpresso IDEのトピックRe: How to print 64-bit data type (to UART console)?

How to print 64-bit data type (to UART console)?

jerrylian — Fri, 26 May 2017 15:43:56 GMT

In MCUXpresso-IDE, when I use CMSIS-DSP function: arm_dot_prod_q15() :

* I got a "q63_t" type data: result = 5 (I debug with break-point)

* But when I print with:

PRINTF("data: %X \r\n", result); ===> data: 430C0000 (It should be: data: 5)

So what is wrong, how to deal with "q63_t" data type?

Thanks!

Jerry

Re: How to print "q63_t" data type?

lpcxpresso_supp — Sun, 28 May 2017 19:59:21 GMT

Is your PRINTF being vectored onto the SDK DEBUGCONSOLE output (typically output via UART), or the C library's printf function (typically output via semihosting) ? See section 11.5 "Use of printf" of the MCUXpresso IDE v10.0.0 User Guide for more background on this.

Might be useful to see your actual project (use Quickstart Panel -> Export option), or at least see the content of your build console after doing a clean build.

Regards,

MCUXpresso IDE Support

Re: How to print "q63_t" data type?

jerrylian — Tue, 30 May 2017 14:58:54 GMT

I am somewhat confused by so many print functions.

But now I have more observations: (I am printing via UART, and just using templates from demo projects)

-----------------------------------------------------------------------------------------------------------

uint64_t v1=12;

uint32_t v2=34;

uint16_t v3=56;

PRINTF("values: %d %d %d \r\n", v2, v2, v3); ===> values: 34 34 56
PRINTF("values: %d %d %d \r\n", v1, v2, v3); ===> values: 536935956 12 0

-------------------------------------------------------------------------------------------------------------

So obviously (by the way, I am testing on board TWR-K60D100M):

* Printing 64-bit values messes up everything!

So how to fix this bug?

Re: How to print "q63_t" data type?

converse — Tue, 30 May 2017 15:57:43 GMT

The bug is in your code... %d is trying to print a 32 bit value only. To tell printf that is is a 64-bit value, you need to use %lld. Suggest you read about printf formatting codes.

Re: How to print "q63_t" data type?

jerrylian — Tue, 30 May 2017 16:12:25 GMT

Thanks, but I tried both "%ld" and "%lld", all seem to be wrong code, it just print:

PRINTF("values: %lld %d %d \r\n", v1, v2, v3); ===> values: lld 536935956 12

So what is the correct format code for 64-bit value?

Re: How to print 64-bit data type?

converse — Tue, 30 May 2017 20:20:38 GMT

What is PRINTF? what is wrong with using just printf?

Re: How to print 64-bit data type?

converse — Tue, 30 May 2017 20:30:24 GMT

I have just run this code

uint64_t v1=12;

uint32_t v2=34;

uint16_t v3=56;

printf("values: %lld %d %d \r\n", v1, v2, v3);

printf("values: %d %d %lld \r\n", v3, v2, v1);

which gives this output

values: 12 34 56

values: 56 34 12

i.e. it works as expected.

Re: How to print 64-bit data type?

jerrylian — Tue, 30 May 2017 20:51:23 GMT

* what IDE did you use?

* And did you print inside IDE? I use PRINTF to print to UART (SDK DEBUG CONSOLE).

(I guess PRINTF == printf if you print inside IDE. BUT it seems that printf can't print to UART!)

Re: How to print 64-bit data type (to UART console)?

converse — Wed, 31 May 2017 07:31:07 GMT

I used MCUXpresso IDE. Yes, I printed to the console. Suggest you try the same to track down the issue.

Your previous post was interesting. You said the output was

PRINTF("values: %lld %d %d \r\n", v1, v2, v3); ===> values: lld 536935956 12

i.e. the (underlying) printf you are using does not understand %lld formatting, which implies that it is incapable of printing 64 bit values. So, try using standard printf to print to the console, then gradually change other things until you find the issue.

Re: How to print "q63_t" data type?

jerrylian — Wed, 31 May 2017 16:05:41 GMT

Hi, LPCX support:

I export and upload my project (base on "demo hello world" project).

Please check why I can't print 64-bit values to UART console.

Thanks!

Jerry

Re: How to print 64-bit data type (to UART console)?

converse — Wed, 31 May 2017 17:20:39 GMT

Sorry, I am not going to debug your project for you.

Re: How to print 64-bit data type (to UART console)?

jerrylian — Wed, 31 May 2017 17:38:31 GMT

no worries. I am providing the project upon the request of the guy "LPCX support", he seems to be NXP staff.

Re: How to print 64-bit data type (to UART console)?

Ray_V — Thu, 01 Jun 2017 15:06:32 GMT

you need to define symbol

PRINTF_ADVANCED_ENABLE=1

in your build settings

Re: How to print 64-bit data type (to UART console)?

jerrylian — Fri, 02 Jun 2017 14:16:04 GMT

Thanks Raymundo,

Your answer works for me!