SBWire
Modified Arduino Wire library which implements basic timeout using loop counting. The default timeout is approximately 100 us and is calculated using F_CPU.
This library has been tested by holding SDA high, which blocks the standard Wire library, while SBWire
timesout and continues execution. When SDA is restored, I2C communication is not established until the slave
is rebooted.
Usage
Simply replace
#include <Wire.h>
With
#include <SBWire.h>
The API is exactly the same.
There is a basic C function to controlling the loop count, twi_setMaxLoops(uint16_t maxloops).
Timeout Behaviour
On timeout, twi_stop() is called followed by twi_init() in an attempt to restart the bus.