Master #46
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These changes make the usiTwiSlave library fully interrupt driven. The fundamental change is to explicitly determine when the I2C master is done sending data [ in a Wire.beginTransmission() / Wire.write() / Wire.endTransmission() set ] within the Interrupt Service Routine (ISR) and then calling the USI_RECEIVE_CALLBACK() function directly. The TinyWireS_Stress_Master and TinyWires_Stress_Slave examples have been modified. The most interesting change is that the slave program now sleeps the Tiny85 CPU which was not possible with the previous version of the usiTwiSlave library. The TinyWireS_stop_check() call is no longer necessary in the main loop because the receive callback routine is called directly from the ISR. The TinyWireS_stop_check() function is still in the TinyWireS library so that prior code that uses the library will still compile and function, however, the TinyWireS_stop_check() function is now empty. Similarly, the tws_delay() is no longer necessary because its main purpose was to call TinyWireS_stop_check() during a delay operation. Regular delay() calls can be used in the main loop. The tws_delay() function is still in the TinyWireS library so that prior code that uses the library will still compile and function. It is intact, but its call the TinyWireS_stop_check calls an empty function. The library changes and the TinyWireS_Stress_Master/_Slave programs have been tested on Uno R3, Mega 2560, Leonardo, and MonkeyBoard ESP8266 E12 boards.
Execute receive callback on repeated start in addition to doing so on a stop.
This reverses the change done in a503849. That change changed the API (even if it wasn't in a way visible through the methods) and failed to match the way the library was intended to be used. This once again makes it possible to send bodies larger than the buffer.
Execute request call for each byte requested
Interrupt driven request callback
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