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0.1.5 TCA9548
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rob tillaart
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@ -6,6 +6,15 @@ 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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## [0.1.5] - 2023-02-12
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- fix #8 ambiguity
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- update keywords.txt
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- add example **tca9548_search_device.ino**
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- update readme.md
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- prepare error handling (constants)
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- some minor edits.
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## [0.1.4] - 2023-01-23
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- update GitHub actions
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- update license 2023
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@ -15,7 +24,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
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- all channel functions return bool, true on success.
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- minor edits
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## [0.1.3] - 2022-11-26
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- Add RP2040 support to build-CI.
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- Add CHANGELOG.md
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@ -40,7 +40,7 @@ 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 datasheets to see the details.
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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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@ -100,32 +100,42 @@ Note that writes are only optimized if the channels are already set.
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- **void setForced(bool forced = false)** set forced write, slower but more robust.
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- forced == false == fast mode (default).
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- forced == true == robust mode.
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- forced == true == slower, robust mode.
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- **bool getForced()** returns set flag.
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## Error Codes
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Not implemented yet, preparation for 0.2.0.
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| name | value | description |
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|:------------------------|:-------:|:------------------------|
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| TCA9548_OK | 00 | no error |
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| TCA9548_ERROR_I2C | -10 | detected an I2C error |
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| TCA9548_ERROR_CHANNEL | -20 | channel out of range |
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## Future
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#### Must
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- improve documentation.
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- improve error handling
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- improve error handling.
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#### Should
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- add examples
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- test test and test
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- write unit test
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- create derived classes for compatible devices
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- add examples.
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- test test and test.
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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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- **bool isConnected(channel, address)** (0.2.0)
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- keep previous mask?
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#### Could
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- set an "always enabled" mask (have to investigate the consequences)
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- verify channel in range
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- e.g. **bool enableChannel(uint8_t channel)**, disable(), select()
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- set an "always enabled" mask.
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- investigate the consequences!
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#### Wont
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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: 0.1.4
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// VERSION: 0.1.5
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// DATE: 2021-03-16
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// PURPOSE: Library for TCA9548 I2C multiplexer
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@ -16,7 +16,7 @@ TCA9548::TCA9548(const uint8_t deviceAddress, TwoWire *wire)
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_mask = 0x00;
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_resetPin = -1;
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_forced = false;
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_error = 0;
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_error = TCA9548_OK;
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}
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@ -118,7 +118,7 @@ uint8_t TCA9548::getChannelMask()
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{
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if (_forced) // read from device.
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{
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_wire->requestFrom(_address, 1);
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_wire->requestFrom(_address, (uint8_t)1);
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_mask = _wire->read();
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}
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return _mask;
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@ -156,7 +156,7 @@ bool TCA9548::getForced()
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int TCA9548::getError()
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{
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int error = _error;
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_error = 0;
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_error = TCA9548_OK;
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return error;
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}
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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: 0.1.4
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// VERSION: 0.1.5
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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 +12,14 @@
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#include "Wire.h"
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#define TCA9548_LIB_VERSION (F("0.1.4"))
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#define TCA9548_LIB_VERSION (F("0.1.5"))
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// ERROR CODES (to be elaborated)
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#define TCA9548_OK 0
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#define TCA9548_ERROR_I2C -10 // not used yet
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#define TCA9548_ERROR_CHANNEL -20 // not used yet
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class TCA9548
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@ -0,0 +1,49 @@
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//
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// FILE: tca9548_search_device.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo TCA9548 I2C multiplexer
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// URL: https://github.com/RobTillaart/TCA9548
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#include "TCA9548.h"
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TCA9548 MP(0x70);
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uint8_t searchAddress = 0x38; // dummy, adjust to your needs.
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__);
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Serial.println();
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Wire.begin();
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if (MP.begin() == false)
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{
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Serial.println("Could not connect to TCA9548 multiplexer.");
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}
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Serial.println("\nScan the channels of the multiplexer for searchAddress.\n");
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for (int chan = 0; chan < 8; chan++)
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{
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MP.selectChannel(chan);
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bool b = MP.isConnected(searchAddress);
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Serial.print("CHAN: ");
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Serial.print(chan);
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Serial.print("\t");
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Serial.print( b ? "found!" : "x");
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}
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Serial.println();
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Serial.println("done...");
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}
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void loop()
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{
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}
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// -- END OF FILE --
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@ -12,6 +12,7 @@ enableChannel KEYWORD2
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disableChannel KEYWORD2
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selectChannel KEYWORD2
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isEnabled KEYWORD2
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disableAllChannels KEYWORD2
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setChannelMask KEYWORD2
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getChannelMask KEYWORD2
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@ -28,3 +29,4 @@ getError KEYWORD2
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# Constants (LITERAL1)
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TCA9548_LIB_VERSION LITERAL1
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TCA9548_OK LITERAL1
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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": "0.1.4",
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"version": "0.1.5",
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"license": "MIT",
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"frameworks": "arduino",
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"platforms": "*",
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@ -1,5 +1,5 @@
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name=TCA9548
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version=0.1.4
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version=0.1.5
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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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@ -61,6 +61,14 @@ unittest_teardown()
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}
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unittest(test_constants)
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{
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assertEqual(0, TCA9548_OK);
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assertEqual(-10, TCA9548_ERROR_I2C);
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assertEqual(-20, TCA9548_ERROR_CHANNEL);
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}
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unittest(test_begin)
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{
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TCA9548 tca(0x70);
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@ -69,7 +77,6 @@ unittest(test_begin)
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assertEqual(b, true);
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assertTrue(tca.isConnected());
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}
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@ -113,4 +120,6 @@ unittest(test_select)
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unittest_main()
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// -- END OF FILE --
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