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temperature
Posted: Tue Nov 02, 2010 9:12 pm
by lazyprogramer
How can I read the DS temperature?
I know there are 2 sensors in the screens but what is the code for reading the temperature?
I found this in libnds/include/nds/arm7 touch:
Code: Select all
uint32 touchReadTemperature(int * t1, int * t2);
But what does it give me? What information?
Re: temperature
Posted: Fri Nov 05, 2010 4:08 am
by Xenon
like this:
Code: Select all
int t1,t2;
u32 temp=touchReadTemperature(&t1, &t2);
printf("%.2f\n",(double)temp/0x1000);
Of course in actual code you need to transfer temp to ARM9 using fifo or IPC.
Re: temperature
Posted: Sat Nov 06, 2010 2:21 pm
by lazyprogramer
Of course in actual code you need to transfer temp to ARM9 using fifo or IPC.
What did you mean? Can you explain me what I have to do if I want to include this code
Code: Select all
int t1,t2;
u32 temp=touchReadTemperature(&t1, &t2);
printf("%.2f\n",(double)temp/0x1000);
in my script?
Re: temperature
Posted: Sat Nov 06, 2010 11:08 pm
by zeromus
I just added an example of user fifo. And lucky you, I used temperature to demonstrate it.
http://devkitpro.svn.sourceforge.net/vi ... /userfifo/
Re: temperature
Posted: Sun Nov 07, 2010 1:37 pm
by lazyprogramer
thank you very much zermorus
But just one last question:
When I start your example on DS I get an endless list of nubers:
739 844 112842
...
And they change very fast... Is this the temperature? And how can I make it in °C and looks better?
Please help
Re: temperature
Posted: Sun Nov 07, 2010 10:53 pm
by zeromus
The temperature is fixed point 20.12 degrees celsius. If you can't figure out why there is an endless list of changing numbers then you've got the wrong hobby.
Re: temperature
Posted: Mon Nov 08, 2010 8:14 pm
by lazyprogramer
The temperature is fixed point 20.12 degrees celsius.
??
What did you mean with that?
And what does these numbers mean? They're are not given in degrees celsius/fahrenheit or Reaumur!
739 844 112842
Re: temperature
Posted: Mon Nov 08, 2010 9:22 pm
by elhobbs
I will give you a hint...
Code: Select all
int t1,t2;
u32 temp=touchReadTemperature(&t1, &t2);
then, look up "fixed point arithmetic"
Re: temperature
Posted: Tue Nov 09, 2010 6:51 pm
by lazyprogramer
The temperature is given in detail, but what are these numbers in degrees celsius? I mean
how can get these numbers in °C???
Re: temperature
Posted: Wed Nov 10, 2010 12:02 am
by elhobbs
Get ready here comes the baby spoon... temp is the temperature in degrees celcius in 20.12 fixed point - divide the number by 4096 (2 to the 12th power) to convert it to an integer.
Seriously though, asking for help and putting in no effort on your part is really annoying.