Pic 18f45k22 i2c assembler code

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Emanuele77

New Member

• Feb 24, 2018

• #1

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

Well-Known Member

Most Helpful Member

• Feb 25, 2018

• #2

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

Well-Known Member

Most Helpful Member

• Feb 25, 2018

• #3

Emanuele77 said:

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

Click to expand...

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

Well-Known Member

Most Helpful Member

• Feb 25, 2018

• #4

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.

 

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Emanuele77

New Member

• Feb 25, 2018

• #5

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

Well-Known Member

Most Helpful Member

• Feb 26, 2018

• #6

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

 

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Emanuele77

New Member

• Feb 26, 2018

• #7

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.

 

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Emanuele77

New Member

• Mar 10, 2018

• #8

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