[U-Boot-Users] printf

[U-Boot-Users] printf

[Rune Torgersen]

Hi

Does anybody know how to get printf (for 82xx CPU) to priont floting point
numbers?
I have tried %f %e and %g but all it prints on the console is f e and g...

I am using a workaround for now, by printing the number as two integers...

	float_num = some_float_operation;
	i = (int)float_num;
	r = ((int)float_num - i) * 100;

	printf("%d.%d", i, r);

But this is kind of bothersome for the long run.

I need this to print out the measured voltages in the system. (done by a
supervisor circuit).
And yes... The 8266 CPU (actually all the 82xx) has a working FPU unit.


Rune Torgersen
System Developer
Innovative Systems LLC
1000 Innovative Drive
Mitchell, SD 57301
Ph: 605-995-6120
www.innovsys.com

[U-Boot-Users] printf

[Wolfgang Denk]

In message <9F5558593173D21190EA0008C7B176987313E4@innsys1> you wrote:
> 
> Does anybody know how to get printf (for 82xx CPU) to priont floting point
> numbers?

U-Boot does not support floating point.

> I am using a workaround for now, by printing the number as two integers...

Good idea ;-)

> I need this to print out the measured voltages in the system. (done by a
> supervisor circuit).

You do not need this. See the existing code (like post/sysmon.c).

> And yes... The 8266 CPU (actually all the 82xx) has a working FPU unit.

But U-Boot does not use the FPU.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Experience is what causes a person to make new  mistakes  instead  of
old ones.