RF12 module need to convert some C to Basic

[Ioannis]

Here come the colon again!

Well, Dave, actually you are running the Oscillator of the PIC at 4MHz, but the core is running at 1MHz (/4).

If you want the pic running at 10MHz, then you should capitalize the define on top of the program as Skimask stated like this:

DEFINE OSC 10

After that, compiler will take care of the rest timing.

Ioannis

[davewanna]

Ioannis...

I had defined the osc to 10, the problem was that at startup, the RFM12 only puts out a 1Mhz clock signal, and at that speed, it would not initialize the RFM12... Not exactly sure why.. I did some mucking around last night, and have now got it to start on 1Mhz, write to the LCD first, then initialize the RFM12. I'm not sure why but it did not want to do this the other way around.

I'm glad I am now making progress..

[Ioannis]

Let me understand what you are doing. You are clocking the PIC from a 1MHz RFM12 output?

Ioannis

[davewanna]

on first turn-on, the RFM12 outputs a 1Mhz osc for the pic, which I am putting in on OSC1.
After I write the command ... dout = $C0F7 : gosub Writecmd ... this changes that osc freq from 1MHz to 10MHz... so my pic will run at 10MHz. I have figured out the problem to just be that my crystal setting was on XT, not HS.

I am onto the next part of converting C to Basic if anyone dare to assist....

void WriteFSKbyte( uchar DATA )
{
  uchar RGIT=0;
  uint temp=0xB800;
  temp|=DATA;
Loop: SCK = 0;
  nSEL=0;
  SDI=0;
  SCK=1;
  if(SDO)         //polling SDO
  {
    RGIT=1;
  }
  else
  {
    RGIT=0;
    WriteCMD(temp);
  }
}

So far I have...

WriteFSKbyte:
temp = $B800

Loop:
SCK = 0
nSEL = 0
SDI = 0
SCk = 1
if SDO = 1 then
  rgit = 1
else
  rgit = 0
endif
SCK = 0
SDI = 1
nSEL = 1
if rgit = 0 then
  goto loop
endif
rgit = 0
dout = temp
gosub writecmd
return

The part I am struggling with right now is...

  uchar RGIT=0;
  uint temp=0xB800;
  temp|=DATA;

Does this take bit 0 of DATA and stick it to temp somehow??

Someone with some C knowledge please help me!

Thanks!

[Ioannis]

Why are you compilcating things?

Just put a crystal or resonator on the pic and have it working on a precise time base. What you are doing now is screwing the timing of the commands and may be locks the pic at the time the freq. is changing. Also at 4MHz and lower the PIC should use XT settings and above that HS settings.

I strongly recommend the PIC using its own clock.

Ioannis

[davewanna]

This is mostly just an excercise for a project of mine. The way the module is toted, is that it can output a clock signal for the pic, so only the crystal on the module is needed, and not 2 seperate oscillators. The examples I have seen of this module being used in the real world have had the osc out line connected to the pic. I have now got this part working though, and it is not a problem.

Cheers

[dhouston]

Do you have to reset the registers each time the RF12 starts or are they non-volatile so that the clock frequency will always be 10MHz (or whatever) once set? In my experience, registers like these are usually non-volatile.