Arduino writing into Picaxe i2c Slave

[Hundred1906]

Would appreciate guidance from anyone who has code to write from an Arduino into a Picaxe 20x2 slave scratchpad memory.

Specifically I want to write a byte of data into Slave address 0. Using the Arduino Wire library I cannot see how the target address is specified. Must be missing something very simple.

 

[nick12ab]

On Arduino, the address is specified by the first byte you write to the slave after using Wire.beginTransmission() and then the bytes after that are the data bytes.

Example:

    [color=#CC6600]Wire[/color].[color=#CC6600]beginTransmission[/color](B1011000);              [color=#7E7E7E]//Initializes i2c transmission to PICAXE[/color]
    [color=#CC6600]Wire[/color].[color=#CC6600]write[/color](x);                                [color=#7E7E7E]//Sets address pointer in the PICAXE to x[/color]
    [color=#CC6600]Wire[/color].[color=#CC6600]write[/color](y);                       [color=#7E7E7E]//Writes y to the PICAXE (at location x)[/color]
    [color=#CC6600]Wire[/color].[color=#CC6600]write[/color](z);                       [color=#7E7E7E]//Writes z to the PICAXE (at location x+1)[/color]
    [color=#CC6600]Wire[/color].[color=#CC6600]endTransmission[/color]();

The number in the Wire.beginTransmission() command is the 7-bit slave address of the PICAXE.

 

[Hundred1906]

Thank you for such a prompt reply.

Crazy API library, but I guess it does the job.