Does the PICAXE support arbitration that would allow two masters to use the same I2C bus? If not, would it be possible to use an analog multiplexer to alternately hand over control of the bus to one PICAXE at a time? There would of course have to be an I/O line between the two controllers for synchronisation. Arbitration or multiplexing would enable a simple form of multitasking to be undertaken by using a number of PICAXE chips on the same system.
I2C arbitration
- Thread starter MFB
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It does not support arbitration, but you could, as you suggest use a third control line. It would not need to be analogue, it could just be open collector based with a pull up, as with the i2c data / clk lines. When the master is active it pulls the line low, other masters check for line high before taking control.