| .. | ||
| .github/workflows | ||
| documents | ||
| examples | ||
| test | ||
| .arduino-ci.yml | ||
| keywords.txt | ||
| library.json | ||
| library.properties | ||
| LICENSE | ||
| MAX14661.cpp | ||
| MAX14661.h | ||
| README.md | ||
MAX14661
Arduino library for MAX14661 multiplexer with I2C interface.
Description
The MAX14661 multiplexer is a 16x2 channel multiplexer. It has 2 lines A and B which can be connected up to 16 A lines and 16 B lines.
The device can be controlled by SPI or I2C. This library implements only an I2C interface
Interface
The library provides 3 kinds of interfaces. Mixing these interfaces is allowed but definitely not advised as especially the PAIR interface assumes that A and B selections are kept in sync.
So depending on your application choose the interface you want to use.
Constructor
- MAX14661(deviceAddress, TwoWire *wire = &Wire) Constructor with device address, and optional the Wire interface as parameter.
- bool begin() initializes the wire interface
- bool begin(sda, scl) idem, for the ESP32 where one can choose the I2C pins.
- bool isConnected() checks if the address is visable on the I2C bus
PAIR interface
The functions in this interface part all work symmetrical on the A and B line. They are managed as a PAIR. So this is ideal e.g. to multiplex an I2C bus.
The interface allows to have multiple lines A/B open in parallel.
// open ==> connect
- bool openChannel(uint8_t channel) connects A/B to output channel
- bool closeChannel(uint8_t channel) disconnects channel from A/B
- bool isOpenChannel(uint8_t channel) returns true if connected to A/B
- void openAllChannels() connects all channels
- void closeAllChannels() disconnects all channels
- void setChannels(uint16_t mask) connect multiple channels with a bit mask.
- uint16_t getChannels() returns a bit mask of the channels connected.
SHADOW interface
not implemented yet.
Allows to prepare which channels should be selected and set them all at once.
MUX interface
The MUX interface allows one channel to be open at a time.
- void MUXA(uint8_t channel) if channel < 16 only that channel will be selected. All other values will select no channel.
- uint8_t getMUXA() returns the selected channel. 255 means none selected.
- void MUXB(uint8_t channel) if channel < 16 only that channel will be selected. All other values will select no channel.
- uint8_t getMUXB() returns the selected channel. 255 means none selected.
FULL CONTROL interface
full control per channel, any combination is possible. Use with care as these can interfere e.g. with the PAIR interface. All functions return false if channel > 15.
- bool openA(uint8_t channel) idem
- bool openB(uint8_t channel) idem
- bool closeA(uint8_t channel) idem
- bool closeB(uint8_t channel) idem
LOW LEVEL CONTROL interface
Check datasheet for these values of the registers.
- uint8_t readRegister(uint8_t reg) read low level device register.
- int writeRegister(uint8_t reg, uint8_t value) write value to device register.
Misc
- lastError() returns the last error, limited to I2C for now.
Error codes
to be elaborated
TODO
- test test
- write unit tests.
- SHADOW interface
- error handling
- improve documentation
- initial value param for begin()?
Operation
See examples