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0.2.0 TCA9548
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Rob Tillaart
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@ -6,11 +6,17 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
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and this project adheres to [Semantic Versioning](http://semver.org/).
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## [0.2.0] - 2023-12-09
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- refactor API, begin()
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- update readme.md
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- add derived class PCA9548
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----
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## [0.1.6] - 2023-11-22
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- update readme.md
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- update keywords.txt
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## [0.1.5] - 2023-02-12
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- fix #8 ambiguity
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- update keywords.txt
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@ -32,6 +32,15 @@ The library caches the channels enabled, and if a channel is enabled,
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it will not be enabled again (low level) to optimize performance.
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#### 0.2.0 Breaking change
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Version 0.2.0 introduced a breaking change.
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You cannot set the pins in **begin()** any more.
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This reduces the dependency of processor dependent Wire implementations.
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The user has to call **Wire.begin()** and can optionally set the Wire pins
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before calling **begin()**.
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#### Compatible devices
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This library is expected to work for the PCA9548(a) too as the TCA is pin compatible newer version.
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@ -43,12 +52,22 @@ This library is expected to work for the PCA9548(a) too as the TCA is pin compat
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| PCA9548a | n |
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There are however small differences, check the data sheets to see the details.
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- [difference TCA PCA](https://e2e.ti.com/support/interface-group/interface/f/interface-forum/815758/faq-what-is-the-difference-between-an-i2c-device-with-the-family-name-pca-and-tca)
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- https://electronics.stackexchange.com/questions/209616/is-nxps-pca9548a-compatible-with-tis-tca9548a
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- https://www.nxp.com/docs/en/application-note/AN262.pdf
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#### Related
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- https://github.com/RobTillaart/HC4051 (1x8 mux)
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- https://github.com/RobTillaart/HC4052 (2x4 mux)
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- https://github.com/RobTillaart/HC4053 (3x2 mux)
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- https://github.com/RobTillaart/HC4067 (1x16 mux)
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## Interface
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```cpp
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@ -65,6 +84,12 @@ Set mask of channels to be enabled, default all disabled.
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- **bool isConnected()** returns true if address of the multiplexer is found on I2C bus.
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The derived class PCA9548 has same interface, except constructor.
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- **PCA9548(const uint8_t deviceAddress, TwoWire \*wire = &Wire)** Constructor.
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deviceAddress = 0x70 .. 0x77, wire = Wire or WireN.
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#### Find device
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- **bool isConnected(uint8_t address)** returns true if arbitrary address is found on I2C bus.
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@ -120,6 +145,27 @@ Not implemented yet, preparation for 0.2.0.
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## Future
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#### PCA954X family
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To investigate if these can be made in one derived class tree.
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| chip | address | channel | interrupt | reset | notes |
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|:---------:|:---------:|:---------:|:-----------:|:-------:|:-------:|
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| PCA9540 | - | 2 | | | address programmable
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| PCA9641 | 4 pins | 2 | | | master selector
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| PCA9542 | 3 pins | 2 | Y | |
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| PCA9543 | 2 pins | 2 | Y | Y |
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| PCA9544 | 3 pins | 4 | Y | |
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| PCA9545 | 2 pins | 4 | Y | Y |
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| PCA9546 | 3 pins | 4 | | Y |
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| PCA9548 | 3 pins | 8 | | Y | equals TCA9648
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- Most could work if a "channels" was defined and if internals are enough similar.
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- RESET pin is supported in TCA9548
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- INT is more a user code issue.
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- might need a **type()**?
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#### Must
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- improve documentation.
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@ -132,6 +178,7 @@ Not implemented yet, preparation for 0.2.0.
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- write unit test.
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- create derived classes for compatible devices (0.2.0).
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- see above PCA9548 and PCA9548a.
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- investigate support derived classes
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#### Could
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@ -1,7 +1,7 @@
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//
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// FILE: TCA9548.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.6
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// VERSION: 0.2.0
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// DATE: 2021-03-16
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// PURPOSE: Library for TCA9548 I2C multiplexer
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@ -9,7 +9,7 @@
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#include "TCA9548.h"
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TCA9548::TCA9548(const uint8_t deviceAddress, TwoWire *wire)
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TCA9548::TCA9548(uint8_t deviceAddress, TwoWire *wire)
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{
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_address = deviceAddress;
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_wire = wire;
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@ -17,25 +17,10 @@ TCA9548::TCA9548(const uint8_t deviceAddress, TwoWire *wire)
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_resetPin = -1;
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_forced = false;
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_error = TCA9548_OK;
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// _channels = 8;
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}
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#if defined (ESP8266) || defined(ESP32)
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bool TCA9548::begin(uint8_t dataPin, uint8_t clockPin, uint8_t mask)
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{
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if ((dataPin < 255) && (clockPin < 255))
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{
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_wire->begin(dataPin, clockPin);
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} else {
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_wire->begin();
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}
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if (! isConnected()) return false;
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setChannelMask(mask);
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return true;
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}
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#endif
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bool TCA9548::begin(uint8_t mask)
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{
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_wire->begin();
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@ -161,5 +146,14 @@ int TCA9548::getError()
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}
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/////////////////////////////////////////////////////////////
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//
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// DERIVED CLASS
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//
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PCA9548::PCA9548(uint8_t deviceAddress, TwoWire *wire) : TCA9548(deviceAddress, wire)
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{
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}
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// -- END OF FILE --
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@ -2,7 +2,7 @@
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//
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// FILE: TCA9548.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.6
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// VERSION: 0.2.0
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// DATE: 2021-03-16
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// PURPOSE: Library for TCA9548 I2C multiplexer
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// URL: https://github.com/RobTillaart/TCA9548
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@ -12,7 +12,7 @@
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#include "Wire.h"
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#define TCA9548_LIB_VERSION (F("0.1.6"))
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#define TCA9548_LIB_VERSION (F("0.2.0"))
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// ERROR CODES (to be elaborated)
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@ -26,11 +26,8 @@ class TCA9548
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{
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public:
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// deviceAddress = 0x70 .. 0x77
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TCA9548(const uint8_t deviceAddress, TwoWire *wire = &Wire);
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TCA9548(uint8_t deviceAddress, TwoWire *wire = &Wire);
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#if defined (ESP8266) || defined(ESP32)
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bool begin(uint8_t dataPin, uint8_t clockPin, uint8_t mask = 0x00); // default no channels enabled
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#endif
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bool begin(uint8_t mask = 0x00); // default no channels enabled
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bool isConnected(); // find multiplexer on I2C bus
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bool isConnected(uint8_t address); // find any address on I2C bus
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@ -58,13 +55,25 @@ public:
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int getError();
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private:
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protected:
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uint8_t _address;
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TwoWire* _wire;
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uint8_t _mask; // caching mask = status of channels
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uint8_t _resetPin; // default not set == -1 (255)
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bool _forced;
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int _error;
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// uint8_t _channels; // future PCA954x support.
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};
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/////////////////////////////////////////////////////////////
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//
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// DERIVED CLASS
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//
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class PCA9548 : public TCA9548
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{
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public:
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PCA9548(uint8_t deviceAddress, TwoWire *wire = &Wire);
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};
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@ -9,7 +9,8 @@
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TCA9548 MP(0x70);
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uint8_t searchAddress = 0x38; // dummy, adjust to your needs.
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// 0x38 is a dummy (in fact a PCF8574), adjust to your needs.
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uint8_t searchAddress = 0x38;
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void setup()
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@ -2,6 +2,7 @@
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# Data types (KEYWORD1)
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TCA9548 KEYWORD1
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PCA9548 KEYWORD1
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# Methods and Functions (KEYWORD2)
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@ -15,7 +15,7 @@
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"type": "git",
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"url": "https://github.com/RobTillaart/TCA9548"
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},
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"version": "0.1.6",
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"version": "0.2.0",
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"license": "MIT",
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"frameworks": "*",
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"platforms": "*",
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@ -1,5 +1,5 @@
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name=TCA9548
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version=0.1.6
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version=0.2.0
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author=Rob Tillaart <rob.tillaart@gmail.com>
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maintainer=Rob Tillaart <rob.tillaart@gmail.com>
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sentence=Arduino Library for TCA9548 I2C multiplexer.
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@ -69,14 +69,18 @@ unittest(test_constants)
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}
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unittest(test_begin)
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unittest(test_constructor)
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{
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TCA9548 tca(0x70);
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bool b = tca.begin();
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assertEqual(b, true);
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Wire.begin();
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assertTrue(tca.begin());
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assertTrue(tca.isConnected());
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PCA9548 pca(0x71);
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assertTrue(pca.begin());
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assertTrue(pca.isConnected());
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}
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@ -84,6 +88,8 @@ unittest(test_enable)
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{
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TCA9548 tca(0x70);
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Wire.begin();
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bool b = tca.begin();
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assertEqual(b, true);
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@ -103,6 +109,8 @@ unittest(test_select)
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{
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TCA9548 tca(0x70);
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Wire.begin();
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bool b = tca.begin();
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assertEqual(b, true);
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