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Update I2CManager_NonBlocking.h
Add code to try and recover from stuck bus following a timeout.
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@ -213,10 +213,21 @@ void I2CManagerClass::checkForTimeout() {
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// Reset TWI interface so it is able to continue
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// Reset TWI interface so it is able to continue
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// Try close and init, not entirely satisfactory but sort of works...
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// Try close and init, not entirely satisfactory but sort of works...
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I2C_close(); // Shutdown and restart twi interface
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I2C_close(); // Shutdown and restart twi interface
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// If SDA is stuck low, issue up to 9 clock pulses to attempt to free it.
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pinMode(SCL, INPUT_PULLUP);
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pinMode(SDA, INPUT_PULLUP);
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for (int i=0; !digitalRead(SDA) && i<9; i++) {
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digitalWrite(SCL, 0);
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pinMode(SCL, OUTPUT); // Force clock low
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delayMicroseconds(10); // ... for 5us
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pinMode(SCL, INPUT_PULLUP); // ... then high
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delayMicroseconds(10); // ... for 5us (100kHz Clock)
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}
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// Whether that's succeeded or not, now try reinitialising.
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I2C_init();
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I2C_init();
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_setClock(_clockSpeed);
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_setClock(_clockSpeed);
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state = I2C_STATE_FREE;
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state = I2C_STATE_FREE;
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// I2C_sendStop(); // in case device is waiting for a stop condition
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// Initiate next queued request if any.
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// Initiate next queued request if any.
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startTransaction();
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startTransaction();
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