MQX Software Solutions中的主题 Re: How to print a float variable?

How to print a float variable?

d_vara — Fri, 03 Jul 2009 17:14:51 GMT

Hello.

In my program I want print or save in file some variables.

When I program this above,it does not work.

float i=1.234;

printf ("Variable= %f", i);

Then, I need to program this:

float i=1.234;

int j;

i=1.234*1000;

j=i/1000;

i=i-(j*1000); //the operator % does not work.

printf ("Variable= %d.%d",j,i); //It work!

This situation occurs in printf and sprintf.

Anyone can solve it?

Thank you.

EAI — Fri, 03 Jul 2009 19:37:38 GMT

Refer to page 128 of the MQX User's manual.

Add:

#define MQX_INCLUDE_FLOATING_POINT_IO 1

to user_config.h (make sure you add it to the correct file in the config directory, not in the lib directory).

Rebuild the PSP library. then rebuild the application.

Note: This will require additional stack space for the tasks calling printf.

d_vara — Fri, 03 Jul 2009 19:47:45 GMT

Ok,Monday I will probe it.

Very thanks.

d_vara — Fri, 03 Jul 2009 20:07:44 GMT

I have just to probe it.

I rebuild all libreries.

But when I recompile hvac_demoEVB for 52259, I can read thetwo next errors:

undefined _io_dtoe

undefined _io_dtof

both referenced from "io_do_print"

Thanks

EAI — Fri, 03 Jul 2009 20:17:27 GMT

You will need to add the file mqx\source\fio\io_fp.c to the psp project as well (it should have been there).

d_vara — Mon, 06 Jul 2009 14:40:19 GMT

Yes. It is the solution.

I use MQX 3.2 with codewarrior 7.1.2.

I make this changes, and now it is work.

Thank you.