I used those app notes and the relevant datasheets for the micro and I2C
device to create my own C code to run I2C devices like the DS1307, it's not
particularly difficult.

As Olin is famous for saying, it's all in the datasheets.

I'd recommend getting a copy of the Phillips/NXP I2C documents as a guide
to the protocol too.

On Tue, 29 Oct 2019, 09:55 Alan Pearce - UKRI STFC, <
alan.b.pearce@stfc.ac.uk> wrote:

> > Have you considered just throwing away the driver and manipulating the
> i2c peripheral directly?
> >
> > The datasheet typically has enough data for one with modest coding skil=
ls
> > to write a serviceable chunk of code.   I've learned over the years tha=
t
> > often for comms and i/o it is better to just ignore the drivers and go
> after the device directly,
> >  as the driver often makes assumptions which are not relevant to your
> specific situation.
>
> Check out AN734 (Slave mode) and AN735 (Master mode) application notes
> from Microchip. I used these successfully with PIC16F876 devices to make =
an
> I2C system. They are in assembly, and IIRC the AN735 code has a bug, but =
I
> have the details if you wish to use it. The code as listed is downloadabl=
e
> with the app note.
>
> I successfully modified them to use interrupts, using an early version of
> Olins template system, and could find the code for you if needed.
>
> --
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>
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