I2C Mem_Write sends a repeated start

[JeremyGrosser]

See conversation on Gitter for details.

[hgrodriguez]

as requested by Jeremy I am attaching the pictures of the logic analyser

this is the Micro Python version, which works:

this is the current RP implementation, which does not work:

and here after my very dirty hack:

the hack (RP.I2C_Master.Mem_Write): declare My_Data : I2C_Data (0 .. Data'Last + 1); begin My_Data (0) := UInt8 (Mem_Addr); for Index in Data'Range loop My_Data (Index + 1) := Data (Index); end loop;

        This.No_Stop := False;
        This.Master_Transmit (Addr    => Addr,
                              Data    => My_Data,
                              Status  => Status,
                              Timeout => Timeout);
     end;

[hgrodriguez]

I am afraid, that maybe Mem_Read needs fixing, too.

[JeremyGrosser]

I changed Mem_Write to use a single Master_Transmit rather than a repeated start between address and data (5879969b90cb0890e3ab445f598431037e00973c).

Mem_Read needs the repeated start because it has to change the I2C address' LSB from write to read between sending the memory address and reading the data.