[PicForth] ANN: libi2c.fs

[J.C. Wren]

David,

    That looks really good.  The one thing I noticed is there are no 
mechanisms for block reads and write.  Trivial block operations can, of 
course, be implemented as a loop, however, this results in the I2C 
address and 16 bit memory address being sent every byte written.  Writes 
also have the problem of taking up to 5ms per byte in most parts (worst 
case), which means writing a chunk of memory gets really slow.

    If you're interested in a block reads and writes that are fairly 
efficient, take a look at this: <URL: 
http://linux.private.com/embedded/Forth/PICForth/demo_i2c.fs >. 

    --jc

David McNab wrote:

> Hi,
>
> Just announcing a new module, libi2c.fs.
>
> Features:
>  - for accessing medium-to-large I2C serial EEPROMS
>    such as 24xx128, 24xx256, 24xx512
>  - 16-bit addresses
>  - PIC-as-I2C-master
>  - uses (requires) on-chip MSSP module, present on
>    some PICs (16F87x[A] etc), but not on others (eg 16F84)
>  - 3 simple words - i2c.init, i2c@ and i2c!
>
> Refer PicForth wiki - http://wiki.enst.fr/bin/view/Picforth/Libi2cfs
>