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i2c bus scan workaround #127

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Merged
merged 1 commit into from
Feb 26, 2016
Merged

i2c bus scan workaround #127

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8 changes: 3 additions & 5 deletions libraries/Wire/Wire.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -110,11 +110,9 @@ uint8_t TwoWire::endTransmission(uint8_t sendStop)
if (txBufferLength >= 1) {
err = i2c_writebytes(txBuffer, txBufferLength, !sendStop);
} else {
/* FIXME: A zero byte transmit is typically used to check for an
* ACK from the slave device. This is currently not supported by
* this library implementation
*/
return 4; // Other error
//Workaround: I2C bus scan is currently implemented by sending an extra byte of value 0
txBuffer[0] = 0;
err = i2c_writebytes(txBuffer, 1, !sendStop);
}
// empty buffer
txBufferLength = 0;
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