want to use PIC 16F887

[coderchick]

Hello!

I have a PCWH compiler version 3.245 and would really like to use the 16F887, however, my compiler does not have a *.h for that chip. Does anyone have an idea on if I can make one or where I could get one?

Thanks in advance.
_________________
KMoe

~We the willing, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little. We are now qualified to do anything with nothing -M. Theresa

[Ttelmah]

Do a search here on this type of question.
How to do this, has been described here several times.
The .h file, _does not add support for a particular processor to the compiler_. It is the least part of the work.
Since you have the WH compiler, you have device editor, which will allow you to add a chip to the core compiler operation. Copy the .h file for a similar chip, adding or removing the parts for extra peripherals.
The file for the 877A, is a good start (difference is the EUSART, rather than USART, and more ADC inputs).
Biggest changes are in the oscillator setups, and these need to be done in the device editor, not in the .h file.
How hard it'll be, will depend on what extra features you use (MCLR as input etc.).

Best Wishes

[coderchick]

Ok, well bummer, I was hoping it'd be a lot easier than that, but thanks, I'll try the search again.
_________________
KMoe

~We the willing, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little. We are now qualified to do anything with nothing -M. Theresa

[coderchick]

Alright, I was given the following link to use my device editor:

http://www.ccsinfo.com/forum/viewtopic.php?t=29362

Here's my problem, the thread is device specific, what I can't figure out is where he found the addresses he used! The Debugger Start Address and Size should be in the device data sheet, but I've been unsuccessful in finding them. Also, where does he find the Hardware Device ID and Hardware Mask? Again I've done searches in the data sheet for device id and mask and have come up fruitless. I understand that you can also ping the chip for this data using the ICD or similar programmer, but I do not have access to this chip yet. Anyone have any ideas?

Also, there are going to be more changes for my migration from the 16F877A to the 16F887, as Ttelmah mentioned, there are more ADC (which are fairly easy) the EUSART and oscillator (which I fear may be more complicated). Again, any help in walking through this would be greatly appreciated. Most of the other stuff I can do on my own, I'm just having a major issue with finding the addresses for my chip.

Help?
_________________
KMoe

~We the willing, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little. We are now qualified to do anything with nothing -M. Theresa

[PCM programmer]

[coderchick]

That helped a little bit. I was able to determine the HW Device ID, but the HW Mask, Debugger Start address and Size, and the Reserved ROM start and end I'm still unsure of. I think I can leave the Debugger Start Address, Size, ROM start and ROM end as they are, but again I don't know for certain.

As for the HW Mask, I can't figure that one out to save my life and I'm still worried about the oscillator and EUSART, though I haven't delved much into those ones yet. This is the first time I've done something like this, not to mention that I have a very small idea of what I'm doing, so I would really like to not screw it up. I'm going crazy here, it doesn't seem like it should be this hard, so what dots am I unable to connect here?
_________________
KMoe

~We the willing, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little. We are now qualified to do anything with nothing -M. Theresa

[PCM programmer]

I think HW Mask is a mask for the Device ID word. It's purpose is to
mask off the lower bits, which are used for the Silicon Revision number.
Those bits can be different, depending upon which date code you get
when you buy the PIC.

The 16F887 Programming Specification shows the bit layout as follows:

[dbotkin]

You can use the device editor and build your own .h file. I wasn't too keen on that approach myself. I spend enough time chasing down code bugs, I didn't want to spend more time chasing bugs in how I built the device description.

You could do it the lazy way like I did... buy a year of maintenance and finally upgrade your compiler. I've also had some success in emailing CCS tech support, explaining the problem and asking for their help. They've been really good to work with.

Dale