dsPIC33F set remapable pins

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Hi folks,

I got myself one of the newer 33F PICs (dsPIC33F12MC202) and it seems that many functions have to be mapped to a pin before being used.

I am trying to map the input compare peripheral to pin RB4/RP4 and have no idea how to do this. I am coding in ASM.

Can someone shed some light, please?
 

I suggest to review the "periperal pin select" chapters 11.6 and 11.7 in device datasheet.

It describes how to program I/O functions by writing to the PPS registers.
 

FvM said:
I suggest to review the "periperal pin select" chapters 11.6 and 11.7 in device datasheet.

It describes how to program I/O functions by writing to the PPS registers.
Click to expand...

No chapter 11.6 on the datasheet I have, can you post a link to the document you are using?

It might be usefull to state that I have a coding problem, since I never coded in ASM before
 

why not code in C ? the pin mapping would be along the lines of
Code: 
 #include "pps.h"
   iPPSInput (IN_FN_PPS_IC1, IN_PIN_PPS_RP4);       // Input Capture 1 (IC1) to RP4
you could always write time critial code in ASM
 

The part number mentioned in your post doesn't exist, I presume you are talking about dsPIC33FJ128MC202. It has a datasheet downloadable at microchip.com. I was referring to a previous revision D, but also recent revision G has a chapter 11.6 about peripheral pin select.

In any case you'll find a PPS chapter in any datasheet about a chip with respective functionality.

I also don't understand the assembly coding problem. Either if it's a good idea to program dsPIC processors in assembly language or not (I don't think it is), PPS registers aren't different from other special function registers, e.g. IO-ports. So if you are able to achieve any dsPIC activity by assembly language programs, you can also manipulate PPS registers.
 

horace1 said:
why not code in C ? the pin mapping would be along the lines of
Code: 
 #include "pps.h"
   iPPSInput (IN_FN_PPS_IC1, IN_PIN_PPS_RP4);       // Input Capture 1 (IC1) to RP4
you could always write time critial code in ASM
Click to expand...

The device code was already provided in ASM, hence I would have to port the whole thing to C

- - - Updated - - -


Check the answer above.

Apparently some instructions like multiplication are performed with the ASM commands. Even on C code microchip does add bits in assembler to make use of such instructions.



The device is a dsPIC32FJ. I missed a character
 
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