Allow customization of transmit and receive buffer sizes for I2C 'Wire' and 'Wire1' objects. #148
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Use C++ static_cast operator instead of C cast operator. Use constexpr for TWI_CLOCK, RECV_TIMEOUT and XMIT_TIMEOUT.
Added example sketches for custom buffers. println() after having printed all received characters in master_reader.ino.
Repositioned constexpr.
Added exampoe slave_receiver_Wire1Wire_connected.
respectively GET_Wire_BUFFERS. Changed SET_WIRE1_BUFFERS and GET_WIRE1_BUFFERS tpo SET_Wire1_BUFFERS respectively GET_Wire1_BUFFERS.
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This pull request for the SAM architecture corresponds to pull request #588 for the AVR architecture.
When I had the need for a bigger Wire buffer, I came up with this implementation.
Existing sketches work like before, but just with one additional macro in the sketch, Wire will get smaller or larger buffers and will omit unnecessary buffers when possible. E.g. the receive buffer will be omitted when no receive is required. There are six example sketches available, that demonstrate how the macro works and give evidence about the customization of the buffer sizes.
Wire buffers are still allocated at compile time.
Both TwoWire objects Wire and Wire1 are supported.
There is also some refactoring done in regard to using C++ casts instead of C casts, making some functions inline for speed.