sml
tinyusb
sml | tinyusb | |
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23 | 48 | |
1,081 | 4,532 | |
2.3% | - | |
6.8 | 9.8 | |
about 1 month ago | 5 days ago | |
C++ | C | |
Boost Software License 1.0 | MIT License |
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sml
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Sharing Saturday #496
Anyway the need is not complicated, I need both entry and exit functions from every state, optionally allowing these functions to be coroutines (that's special sauce but for later), and an explicit state transition table which also have a way to say that a state can be accessed at any point. Also allow states to be state machines, optional FSM hierarchies. If you ignore the coroutine stuff it's pretty standard features these days, except that - Boost.MSM is quite archaic now (it was so novel when it was first released...) although it allows most of the features I talked about, I just think it will complicate my code unneecessarilly; - Boost-Ext.SML (not Boost) is almost perfect except it doesnt have entry/exit functions on states for some reason. Also last time we (as in in livestream) tried it in prototypes it didnt compile on msvc XD - Boost-Ext.SML2 is even better but still doesnt have entry/exit functions although it's in the plans.
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State machines with C++20 coroutines and Asio/Boost Async
Hello all. Being a huge fan of state machine and coroutines, I have been browsing around for examples of what other people do combine these two. I have been using boost-ext/sml for quite many projects and are quite happy about that. But when transitioning to code that relies on coroutines, I would like to write entry/exit/actions/guard methods that uses coroutines and where I can co_await on awaitables from Asio and more recently "Boost Async".
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Looking for well written, modern C++ (17/20) example projects for microcontrollers
boost-ext/sml: quite modern way of doing state machines using a DSL
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When Debug Symbols Get Large
I recently was troubleshooting a crash that backtraced through the boost::sml library [0]. The crash didn't actually have anything to do with the library, but it was used as the core event loop.
The backtrace -- as in, just the output from running `bt` in GDB -- was over a thousand wrapped lines long. There were ~5 stack frames that took up 200 lines of console each to print just the function name. That product's debug builds recently hit the 2GB line, which is enough that old versions of binutils complain.
I don't know what the solution is. There's some really neat stuff you can do with template metaprogramming, and in stripped release builds it compiles down extremely tiny. Plus the code is very clean to read. But it does feel like there isn't any kind of central vision for the C++ debugging experience, and bad interactions between highly-complex modern C++ typing, the compiler, and the debugger are probably only going to get worse unless somebody (the ISO committee? Vendors?) thinks really hard about debugging support.
[0]: https://github.com/boost-ext/sml
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[Boost::MSM] Huge Memory Usage Issue During Compilation
I'm a big fan of MSM but what you're experiencing is pretty normal for template-heavy libraries built on C++03 machinery (emulation of variadic templates is the usual culprit). It's probably not the answer you're hoping for, but the real solution is to switch to a library with more modern foundations. (I've been happily using [Boost::ext].SML for a few years but I'm reluctant to strongly recommend anything in particular since I haven't re-explored the problem space since I found it.)
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State machine suggestion?
The Boost one that you mention, seems to be one that it's kinda old. A "successor" of sorts is Boost SML. I've not used it yet, but certainly the first impressions are very good.
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Specifications for an open source finite state machine library
Or Boost.Sml
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Facts about State Machines
At our company, we rely a lot on https://github.com/boost-ext/sml
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What are some cool modern libraries you enjoy using?
I'm a big fan of boost::sml for representing state machines.
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[C++20] New way of meta-programming?
https://github.com/boost-ext/sml (State Machine DSL and backend for perfomance)
tinyusb
- An open source cross-platform USB stack for embedded system
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Bluetooth to USB Audio bridge
Implementing the required USB host interface is another hurdle, but tinyusb seems to have sorted most of that out, except that UAC2 is implemented as a device while you need a host.
- So I started porting braids to the PI PICO and ended with a generative drum machine
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USB CDC: Multiple Virtual COM Ports
Have a look at TinyUSB. It supports the STM32WB and demo programs for the Nucleo-WB55RG. It even offers an example for dual CDC ports, so very close to what you're looking for.
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Looking for well written, modern C++ (17/20) example projects for microcontrollers
Second: Distrust, misunderstanding, and out of date opinions of C++ in embedded spaces. I often see "compatibilty" thrown around as a goal for using C and not C++, but for most modern embedded systems, C++ compilers exist and are (usually) well tuned. Arm is a shining example here*. C++ is more optimizable than C as the intent can be clearer to the compiler. C++ constexpr and templates are a godsend for embedded systems, and I used both heavily in my recent arduino and pico testing. I combined both of them for a really cool experimental USB interface descriptor builder that runs at compile time and avoids the need to count byte sizes, but I gave up on it when the maintainer said C only, despite the fact that C can't do that. I was similarly disappointed when the pico "C++" was C only, as there was no backwards compatibility necessary.
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Pico + CH559 = USB Midi host?
I looked at this but the fork seems to have had a lot of problems from looking at the PR: https://github.com/hathach/tinyusb/pull/1219
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Badger 2040: tiny kit ereader
I think a better solution might be to use a USB flash drive in the usbc port. Unfortunately micropython and circuitpython don't support this (yet), so you'd have to use c++ https://github.com/hathach/tinyusb
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ESP32-S3 Update via USB?
It's possible to make the s3 be a mass storage device via TinyUSB. https://github.com/hathach/tinyusb/tree/master/examples/device/cdc_msc_freertos
- Microcontroller that can read voltage?
- how do emulate a keyboard over usb? wherever I look I only see libraries and tutorials on how to use the eps32 as a Bluetooth keyboard not a wired one
What are some alternatives?
hsm - Finite state machine library based on the boost hana meta programming library. It follows the principles of the boost msm and boost sml libraries, but tries to reduce own complex meta programming code to a minimum.
esp32-s2-usb-host-cdc
stm32plus - The C++ library for the STM32 F0, F100, F103, F107 and F4 microcontrollers
libusb - A cross-platform library to access USB devices
hana - Your standard library for metaprogramming
lufa - LUFA - the Lightweight USB Framework for AVRs.
HFSM2 - High-Performance Hierarchical Finite State Machine Framework
hid-remapper - USB input remapping dongle
Experimental Boost.DI - C++14 Dependency Injection Library
rt-thread - RT-Thread is an open source IoT real-time operating system (RTOS).
Boost.Beast - HTTP and WebSocket built on Boost.Asio in C++11
Adafruit_TinyUSB_Arduino - Arduino library for TinyUSB