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Changelog for the TeensyDMX Library

This document details the changes between each release.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

  • Provided an option to replace internal use of the Teensy library's IntervalTimer API with our own custom PeriodicTimer API (see v4.1.0-beta.2). This improves transmitted BREAK time accuracy (when using a timer and not serial parameters). Set the global TEENSYDMX_USE_PERIODICTIMER macro when building to use this timer API instead.
  • Added a way to set the inter-slot MARK time. See Sender::setInterSlotTime and Sender::interSlotTime().
  • Added a way to set the MARK before BREAK (MBB) time. See Sender::setMBBTime and Sender::mbbTime().
  • New RegenerateDMX example.
  • New FastLEDController example.
  • Added Sender::setPacketSizeAndData for atomically setting the packet size and data. This doesn't grab the lock if the new packet size is the same.
  • New TeensyDMX::serialNumber() function that returns the serial port number.

Changed

  • Changed relevant __disable_irq()/__enable_irq() pairs to ATOMIC_BLOCK(ATOMIC_RESTORESTATE) so that interrupts are not enabled inappropriately, for example if the calling program had disabled them.
  • Clarified some details about minimum packet size.
  • Improved MAB time measurement when using an RX watch pin by watching for the MAB fall time.
  • Made Sender and Receiver movable.

Fixed

  • Allow 2% smaller character time when determining a bad break. This fixes a problem where packets with a slightly faster, but within allowed tolerance, baud rate were being discarded.
  • Made Responder::~Responder() virtual.
  • Fixed send handler code paths that shouldn't have called setCompleting(). This change was introduced in commit a2ac5f0.
  • Fixed continuous TX interrupts in the transmitter (appears as a program freeze) when RX gets triggered. See: #20
  • Fixed missing disableRX() calls in the send handlers.
  • Changed receiver to only check for bad break at first byte. It wasn't technically accounting for inter-slot time, but that didn't actually matter; it still simplified the code.

[4.2.0]

Added

  • New Sender::fill function that fills a channel range with a value.
  • Added NULL checking for the values pointer in Sender::set and Sender::set16Bit.

Changed

  • No more volatile objects with weird copy constructors and assignment operators. Using atomic fences instead.
  • Improved use of public, protected, private, and volatile.
  • Sender::setPacketSize now disallows sizes of zero. The new allowed range is 1-513.
  • Timeout detection in Flasher, USBProWidget, and the README now compare using strictly less than the timeout value so that the timeout value itself can be used to manually trigger a timeout, instead of having to use an arbitrary value greater than the timeout value.
  • Changed uses of std::shared_ptr to regular pointers.

Fixed

  • Ensure the packet size can't be changed in the middle of sending a packet.
  • Improved lambda hygiene.

[4.1.1]

Added

  • Added a BREAK start timestamp to PacketStats, frameTimestamp. The value is in microseconds.
  • Added Receiver::rxWatchPin() for retrieving the RX watch pin number.
  • Added a note to the docs for Receiver::setRXWatchPin reminding the caller to configure the pin for input.

Changed

  • DMX TX and RX are now started with new startRx and startTx convenience functions in the USBProWidget example.
  • Updated comment layout in the examples to be <= 70 columns to help improve readability, for example for larger fonts.

Fixed

  • Fixed Chaser example to start the blink and packet correctly.
  • Fixed TextPacketHandler example to define one of the static members.
  • Fixed Sender to use double-buffering to guarantee atomic behaviour.

[4.1.0]

Added

  • USBProWidget example: Added received message error handling.
  • Added 7- and 9-bit format support when using serial parameters to accomplish BREAK and MAB timing.
  • Sender::breakTime() and mabTime() now return correct values if the sender is using serial parameters instead of a timer to generate the BREAK/MAB times.

Changed

  • USBProWidget example:
    • Moved DMX receive processing into the main loop.
    • Reduced the minimum returned BREAK time to 10.67us instead of 9*10.67us.
    • Updated uses of memcpy and memcmp to std::copy_n and std::equal, respectively.
  • BasicSend example: Now calling begin() after setting the channel contents.
  • Sender::setBreakSerialParams now checks for valid parameters and returns a Boolean indicating success.

Fixed

  • USBProWidget example:
    • More correct changed-DMX behaviour.
    • All commands except the appropriate ones now reset the program to input mode.
  • Fixed Sender::resumeFor to ensure the UART has been started before setting it to active.

[4.1.0-beta.2]

Added

  • Added a way to use either serial parameters or a timer to achieve the BREAK and MAB timings. Along with this, added the ability to change those serial parameters. New functions:
    • setBreakSerialParams
    • breakSerialBaud
    • breakSerialFormat
    • setBreakUseTimerNotSerial
    • isBreakUseTimerNotSerial
  • Added an "Examples" section (under "How to use") to the README.
  • Added a USBProWidget example.

Changed

  • Replaced use of the custom PeriodicTimer with the Teensy library's IntervalTimer. This helps compatibility with other libraries that use this API. This means that BREAK times are slightly less accurate (when using a timer and not serial parameters).
  • Changed the default way to generate BREAK and MAB timings to use serial parameters instead of a timer.
  • Updated the SendTestPackets example to use serial parameters for the BREAK and MAB times. Also changed the previous BREAK and MAB times to 88 and 8 (from 108 and 12), respectively, and commented that section out; it's present as an alternative.
  • Updated the Chaser example change interval to 50ms so that it's greater than the DMX packet time.

Fixed

  • Fixed the sender to handle parity correctly when using serial parameters to achieve the BREAK and MAB timings. Some of the control bits were being incorrectly overwritten (LPUART) or not saved (UART).

[4.1.0-beta.1]

Added

  • Added an error stat for packets that are too long.
  • README additions:
    • New table of contents
    • New "Error statistics" section
    • Added details about packets that are too long

Fixed

  • Fixed the status read inside LPUARTReceiveHandler::irqHandler to use uint32_t instead of the incorrect uint8_t. STAT is a 32-bit register.

[4.1.0-beta]

While the functionality stays the same, this is a major update because of the restructured code. Much of the #define-based code was replaced with something much more maintainable.

Added

  • Added Serial8 support for Teensy 4.1.
  • Added a Teensy 4.1 section to platform.ini.

Changed

  • Replaced much of the #define-based code with something much more maintainable.

[4.0.0]

Added

  • New section in the README: "A note on MAB timing" inside "Choosing BREAK and MAB times" in the "DMX transmit" section. This describes why the MAB times may be longer than specified.
  • New item in the README's TODO list: Better MAB timing.
  • New '?' command in the main example that prints all available sketches and stars the active one.

Changed

  • Updated the library description with some additional features.
  • Updated the main example program to use pre-allocation instead of dynamic allocation.

[4.0.0-beta]

Added

  • A TODO list to the README that describes features being considered for subsequent versions.
  • New SendADC example.

Fixed

  • Fixed IDLE detection for the case where a few characters are in the FIFO and an IDLE condition occurs. The IDLE in this case is now captured.

[4.0.0-alpha.8]

Added

  • Added an optional rangeError parameter to Receiver::get to match the same parameter in Receiver::get16Bit. Because the function returns a value, it provides a way to know whether a zero return value was because of an error.
  • New "Keep Short Packets" feature and associated PacketStats::isShort variable that allow callers to know when received packet data is part of a short packet, if kept. Also added new Receiver::setKeepShortPackets(bool) and Receiver::isKeepShortPackets() functions for setting and getting the feature state.

Changed

  • Changed util::IntervalTimer to accept std::functions for the trigger function.
  • Renamed util::IntervalTimer to util::PeriodicTimer.
  • Improved IDLE and timeout handling logic. It is the goal to be as accurate as possible.

Fixed

  • Fixed Receiver::packetStats() and Receiver::errorStats() to access the values atomically.
  • Changed Receiver::setRXWatchPin(int) to disable all interrupts instead of just the UART ones because the pin interrupt may have a different priority.

[4.0.0-alpha.7]

Added

  • Teensy 4 support.

Fixed

  • Fixed a case in the transmitter where if the MAB was zero, then it would be sent with the same duration as the BREAK.

[4.0.0-alpha.6]

Added

  • There's a new alternative implementation of IntervalTimer that's being used to generate BREAK and MAB timings. This version allows state to be passed to the trigger function. It also has a slightly different API that allows other ways to start and restart the timer.

Changed

  • README updates.

Fixed

  • Receiver::setRXWatchPin didn't allow negative arguments because the parameter was of type uint8_t; it's now an int.
  • When sending a responder-initiated BREAK from the receiver, the routine now properly waits for transmission of any previous characters to complete; it was checking the register containing FIFO capacity instead of the register that indicates idle.

[4.0.0-alpha.5]

Added

  • There are two new constants, kMinTXBreakTime and kMinTXMABTime, that hold the minimum BREAK and MAB times allowed by the specification for transmitters.
  • Added a new SendTestPackets example that sends standard test packets, as specified in section D3 of the DMX specification. This was enabled by the new ability to specify the transmitter BREAK and MAB times.
  • There's a new Sender::set16Bit function that can set a range of 16-bit channels.

Changed

  • Some improved documentation.
  • Changed Responder::breakLength(), a function that returns the number of 11-bit character times, to Responder::breakTime(), a function that returns a duration in microseconds. Also changed Responder::markAfterBreakTime() to Responder::mabTime().
  • Updated the SIPHandler example to remove the need for using const_cast by using std::copy_n instead of memcpy. Also replacing the checksum function with std::accumulate to be more modern.
  • All the set and action functions in Sender that previously did nothing or ignored the values on bad input now return a bool indicating success. These include in Sender: the two 8-bit set functions, set16Bit, setRefreshRate, the two resumeFor functions, and setPacketSize.

[4.0.0-alpha.4]

Added

  • BREAK and MAB times can be determined separately in the receiver, in addition to their sum, if the RX pin is monitored by connecting it to a digital I/O-capable pin and calling the new Receiver::setRXWatchPin function. This removes the limitations the receiver has when checking for packets having invalid timing, but only when using this feature.
  • The BREAK and MAB times in the transmitter can now be specified more accurately via new Sender::setBreakTime and Sender::setMABTime functions. The actual times will be close, but the MAB may be a little longer than specified.

Fixed

  • MAB and BREAK-plus-MAB time calculations have been fixed when bytes are received all at once from a FIFO.
  • Data is now discarded at all places a framing error is encountered.

[4.0.0-alpha.3]

Added

  • Added a way to set and retrieve 16-bit values using new Receiver::get16Bit and Sender::set16Bit functions.
  • Added the ability to enable and disable the transmitter in the receiver via a new Receiver::setTXEnabled function. This is useful when it is known that the receiver will be receive-only and it is not desired to drive the TX line.
  • New Receiver::packetStats() and Receiver::errorStats() functions with associated Receiver::PacketStats and Receiver::ErrorStats classes for examining the latest packet statistics and error counts.

Changed

  • In the sender, changed how the baud rate is set when switching between the BREAK baud rate and slots baud rate. The UART/LPUART parameters are set directly instead of calling begin on the serial port object. This avoids setting values where we don't need to and has the effect of shaving some microseconds off the Mark after BREAK (MAB) so that it is closer to the desired duration.
  • Receiver::begin() now resets all the packet statistics.
  • Error counts and packet statistics functions have been replaced with functions to retrieve Receiver::ErrorStats and Receiver::PacketStats, respectively: Receiver::errorStats() and Receiver::packetStats().
  • Receiver::readPacket has an additional but optional parameter that provides a place to store the packet statistics, a PacketStats*, allowing atomic retrieval with the packet data.

Removed

  • Receiver::packetTimeoutCount(), Receiver::framingErrorCount(), and Receiver::shortPacketCount() were replaced by Receiver::errorStats() and its associated Receiver::ErrorStats class.

[4.0.0-alpha.2]

Fixed

  • This release should really fix the test-first-stop-bit problem. It turns out that Teensy 3.5, 3.6, and LC all support a 2-stop-bit mode, and so it is never appropriate to test bit R8 for these platforms. Bit R8 is now only tested as the first stop bit if the board is not one of these types.

[4.0.0-alpha.1]

Fixed

  • Teensy LC wasn't able to receive DMX data because the framing check that examined the first stop bit in each byte was always returning false. For some reason, the R8 bit in UARTx_C3, which functions as the first stop bit, is always zero. The check was changed for the Teensy LC to always return true.

[4.0.0-alpha]

Added

  • Added a note to the BasicSend example that the transmit-enable pin may not be needed. The pin's existence was causing some confusion.

Changed

  • The main.cpp example program now uses a smart pointer for the current sketch, currSketch.
  • Responders are now passed as smart pointers instead of raw pointers to Receiver::setResponder.
  • Prep-work for Teensy 4 support. The library compiles but does not yet work on a Teensy 4.

Fixed

  • When a frame error was being recorded due to the first stop bit not being high, the input UART buffer was not being flushed. The buffer is now flushed when this happens. There were reports of DMX receive freezing the device; this should fix the problem.

[3.2.2]

This version is in a branch called fix-dmx-receive-in-v3.2.0.

Fixed

  • This release should really fix the test-first-stop-bit problem. It turns out that Teensy 3.5, 3.6, and LC all support a 2-stop-bit mode, and so it is never appropriate to test bit R8 for these platforms. Bit R8 is now only tested as the first stop bit if the board is not one of these types.

[3.2.1]

This version is in a branch called fix-dmx-receive-in-v3.2.0.

Fixed

  • When a frame error was being recorded due to the first stop bit not being high, the input UART buffer was not being flushed. The buffer is now flushed when this happens. There were reports of DMX receive freezing the device; this should fix the problem. [The fix does not work for Teensy LC.]
  • Teensy LC wasn't able to receive DMX data because the framing check that examined the first stop bit in each byte was always returning false. For some reason, the R8 bit in UARTx_C3, which functions as the first stop bit, is always zero. The check was changed for the Teensy LC to always return true.

[3.2.0]

Added

  • New Responder::preDataDelay() method that returns the time in microseconds to wait after the pre-BREAK or no-pre-BREAK delay times (preBreakDelay() or preNoBreakDelay()), and after the transmitter is turned on.

Changed

  • If a Responder is being used, Receiver now delays for preNoBreakDelay() before enabling the transmitter. After delaying for preBreakDelay() or preNoBreakDelay(), the transmitter is enabled, and then Receiver delays for preDataDelay() microseconds.
  • Improved framing error detection: the case where there's a short BREAK followed by a long MAB is now detected.

Fixed

  • Receiver now checks that the first stop bit of a received byte is logic 1. On the Kinetis chips, the first stop bit of two stop bits is implemented as the 9th bit of the 9-bit mode.

[3.1.1]

Added

  • New section in the README that describes how to connect DMX via a transceiver to a Teensy. See the new "Hardware connection" section under "Technical notes".

Changed

  • Updated library description.

Fixed

  • Added some missing literals to keywords.txt.

[3.1.0]

Added

  • New Sender::clear() method that sets all the channels to zero.
  • New Sender::breakTime() and Sender::mabTime() methods that return the BREAK and MARK after BREAK (MAB) times in microseconds, respectively.
  • Added a section to the README that describes when connection detection doesn't work and what to do about it.

Changed

  • Made the constructors explicit because they're single-argument.
  • There's now less protected data in the base TeensyDMX class.
  • Made Sender::set behave atomically.
  • Class documentation updates.
  • The packet count is now reset to zero when the receiver or transmitter is either started for the first time or restarted.

Fixed

  • Interrupts are now correctly not enabled if an instance of Sender or Receiver is stopped, i.e. never started or had its end() method called.
  • Receiver::setConnected wasn't actually changing the internal connected state. The state is now updated correctly so that Receiver::connected() returns the correct value.

[3.0.0]

Added

  • Two new examples, BasicSend and BasicReceive.

Changed

  • Updated keywords.txt.
  • The internal array that keeps track of responders in Receiver is now dynamically allocated; this saves about 1k of memory.
  • Changed Receiver::addResponder to Receiver::setResponder; also changed its behaviour so that setting a responder to nullptr removes any responder for the given start code.
  • Changed the behaviour of Sender::pause so that the caller must wait until transmission is complete before setting any values with one of the set functions. Instances of Sender are smaller by about 0.5k because there's no need to hold an internal "paused" array.

Fixed

  • It was technically possible to overwrite the contents of a packet in the process of being sent if pause->set->resume was done quickly. Requiring any set call to wait until transmission is complete removes having to manage the concurrency.
  • On small systems such as the Teensy LC, dynamic memory allocation in Receiver::setResponder may fail. This was fixed and the documentation in TeensyDMX.h and the README was updated. The caller can check the ENOMEM condition in errno to detect this condition.
  • The behaviour of Receiver::get was changed so that it always returns the last received value for a channel. It is no longer affected by a previous call to Receiver::readPacket for the same received packet, where the packet was reset to empty. This change makes the function behave closer to expected.

[3.0.0-beta]

Added

  • New document describing BREAK timing in relation to serial ports.

Changed

  • Unified the RX status and error ISRs because framing errors and data should have the same priority.
  • Refactored all the synchronous UART TX routines in Receiver to common #defines.
  • Minor documentation updates.
  • setRXNotTX concept renamed to setTXNotRX, in Receiver.
  • Small updates to the examples.
  • Some concurrency improvements.

Fixed

  • ISR-triggering status bits are now cleared properly for Teensy LC.

[3.0.0-alpha]

Added

  • Short packet detection. These are packets that are smaller than 1196us.
  • Ability to get the current transmitted packet size with Sender::packetSize().
  • The concept of being connected in Receiver. There is a polling function, connected(), and also a way to register a callback for when the state changes, via onConnectChange.
  • Associated with the concept of being connected in the receiver, and in addition to the improved BREAK plus MAB timing checks, Receiver now also checks for inter-slot and Mark before Break (MBB) IDLE times that are too long. Detecting these conditions will register as a change to the connected state.
  • Synchronous operation in Receiver. Using the new Responder class, it's now possible to intercept, and even respond to, each packet as it comes in.
  • Two examples that use the new Responder feature: SIPHandler and TextPacketHandler.

Changed

  • Renamed:
    • Sender::getRefreshRate() to Sender::refreshRate().
    • Sender::getResumedRemaining() to Sender::resumedRemaining().
  • The licence changed from BSD-3-Clause to BSD-3-Clause-Clear.

Fixed

  • Documentation fixes.
  • Improved packet timeout detection. It now detects when the BREAK plus MAB duration is too short, but not when they are individually too short.
  • Added a define around the contents of main.cpp so that the project can be used in an Arduino environment. This prevents the setup() and loop() definitions in main.cpp from interfering with the Arduino program.
  • Receiver::get now respects the current received packet size and behaves more similarly to Receiver::readPacket.

[2.5.0]

Added

  • The sender can now be paused and resumed. This allows implementations to send packets that must be adjacent to other packets, for example, System Information Packets (SIP) (see Annex D5 of ANSI E1.11). Essentially, the effect is being able to use the asynchronous transmitter synchronously.

    New Sender functions include:

    • pause()
    • isPaused()
    • resume()
    • resumeFor(int)
    • getResumedRemaining()
    • isTransmitting()
    • onDoneTransmitting

  • Two examples that show how to send SIP packets using synchronous transmission: SIPSenderAsync and SIPSenderSync.

Changed

  • The receiver no longer keeps packet data if it's followed by a framing error having non-zero data. Framing errors are used to detect BREAKs and must consist of all zeros in order for it to be considered a valid BREAK. This choice was made because the condition may indicate corrupt data.

    See: BREAK timing at the receiver

  • Reduced the amount of duplicated code in the UART transmit and receive ISRs via macros.

  • Internally, when Sender needs to disable interrupts, only the UART interrupts are disabled for the required duration. This change is similar to the change made in the previous release for Receiver::readPacket.

  • Updated keywords.txt.

  • Now allowing packet sizes less than 25 (i.e. less than 24 channels) in Sender::setPacketSize.

Fixed

  • UARTs 2 and above (Serial3 and above) were not correctly detecting BREAKs because the framing error detection appeared to be overidden by the other receive routines. This was fixed by increasing the priority of the framing error interrupts to one greater than the priority of the status interrupts.
  • Sending via UARTs having FIFOs now works correctly with transmission-complete timing. Sender::completePacket() is now called at the correct place.

[2.4.0]

Added

  • A basic main program so that it's easy to compile the project.
  • Support for Teensy 3.6's LPUART0 (Serial6).
  • Support for Teensy LC.
  • The ability to change the transmit refresh rate, via Sender::setRefreshRate.

Changed

  • Reading from a packet via Receiver::readPacket no longer disables all interrupts. Only the serial interrupts are disabled.
  • The TeensyDMX constructor and destructor are now protected.
  • BREAK/Mark-After-Break timing changed from 108us/12us to 180us/20us. This more closely matches the "typical" DMX BREAK timing specified in the DMX specification (ANSI E1.11).
  • Some function and README documentation updates.
  • Moved the kMaxDMXPacketTime constant into Receiver.

Fixed

  • Added some missing disable-interrupt cases to Sender::end().

[2.3.2]

Changed

  • Chaser.ino and Flasher.ino examples now properly wait for the serial monitor at program start. The baud was also changed to 115200.
  • Changed print interval in Flasher.ino to 1000ms.
  • Slightly optimized the Flasher.ino wave calculation.

[2.3.1]

Added

  • Added a CHANGELOG.

Changed

  • Updated the keywords.txt file.

[2.3.0]

Fixed

  • Better handling for packet boundaries and timeouts.

[2.2.0]

Added

  • Support for serial ports 4-6.

[2.1.0]

Added

  • A lastPacketTimestamp() function to retrieve the timestamp of the most recent packet received.

[2.0.0]

Initial public release.

Copyright (c) 2017-2023 Shawn Silverman