Pic 18f45k22 i2c assembler code

[Emanuele77]

Hi to all,
i need a simple assembler code to send/receive data with i2c module (in master mode) on pic18f45k22 .
I have see application note AN735 but is old and written for Pic16 (can be ported to a pic18c...).

Does any of you have a simple working example written in assembler to send and receive data in I2c?


Thx

 

[granddad]

Welcome to ETO Emanuele . I am wondering why assembler ? . PIC18 instruction set is optimised for C . The C code gets turned into asm and compiled to HEX . What you need is doable but I see no advantage ...

 

[atferrari]

Hi to all,
i need a simple assembler code to send/receive data with i2c module (in master mode) on pic18f45k22 .
I have see application note AN735 but is old and written for Pic16 (can be ported to a pic18c...).

Does any of you have a simple working example written in assembler to send and receive data in I2c?

Thx

Nigel Goodwin, member here, has published a series of tutorials. is precisely about I2C. It took me little time to implement two PICs linked through I2C.

Now that I think of it, IIRC, it is done bit-banging style. I think I did it with a 18F as well but not sure.

Sorry but my PC where all it is buried is defunct. No time to retrieve my data where my test is for the moment.

 

[MaxHeadRoom78]

There is also AN989 for the 18F series.
I did a version for the P18F2221 in assy.
Also check out the MAXIM MAX517/518/519 IC spec sheet.
Max.

 

[Emanuele77]

Thanks to all Max Atferrari Granddad ....this site is a precious resource for a designer,
now i will study on the basis of what you have suggested to me,
Hi Granddad you're right but i have to modify a program entirely written in assembler and I did not want to redo everything in c.

 

[granddad]

I see now... best of luck with that . I usually cannot fathom my own previous / old asm ....

 

[Emanuele77]

I design machines in esthetics field,
i tend to use the microcontrollers and the programming modes i already know, already tested even if in assembler.
I realize that it is wrong but many times there is little time for design and venturing with another processor or programming mode can be risky.
I am currently trying to learn stm32f429i-disk1 in C \ C ++ maybe i still need your help thanks to all.

 

[Emanuele77]

Thanks to everyone in particular to Max with the application note 989 i2c bus works correctly.