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Update I2CManager_Wire.h

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Add alternative multiplexer support for I2C Wire subsystem.
This commit is contained in:
Neil McKechnie 2023-02-25 11:43:36 +00:00
parent 8c8a913678
commit f56f5d9ebe
1 changed files with 9 additions and 1 deletions
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10
I2CManager_Wire.h
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@ -77,7 +77,15 @@ static uint8_t muxSelect(I2CAddress address) {
Wire.beginTransmission(I2C_MUX_BASE_ADDRESS+muxNo);
uint8_t data = (subBus == SubBus_All) ? 0xff :
(subBus == SubBus_None) ? 0x00 :
(1 << subBus);
#if defined(I2CMUX_PCA9547)
0x08 | subBus;
#elif defined(I2CMUX_PCA9542) || defined(I2CMUX_PCA9544)
0x04 | subBus; // NB Only 2 or 4 subbuses respectively
#else
// Default behaviour for most MUXs is to use a mask
// with a bit set for the subBus to be enabled
1 << subBus;
#endif
Wire.write(&data, 1);
return Wire.endTransmission(true); // have to release I2C bus for it to work
}