dsPIC33F set remapable pins

[cts_casemod]

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?

 

[FvM]

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.

 

[cts_casemod]

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.

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

 

[horace1]

why not code in C ? the pin mapping would be along the lines of

 #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

 

[FvM]

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.

 

[cts_casemod]

why not code in C ? the pin mapping would be along the lines of

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

- - - Updated - - -

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.

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