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Normal TX handler for IN non-0 endpoints is called during outgoing transfer or just after it was finished. It may need to fill TX fifo with same data if TX_DONE is present but ACK_STAT is not. It may need to fill more data when called during transfer. But it may also be called when STALL was sent. In this case TX_DONE is set ACK_STAT is not, just like for packets that were sent but no ACK was received. Code was trying to send something again. There was nothing to send so empty ZLP was scheduled for stalled endpoint. This ZLP was later send to host where valid response was required. This change checks if notification was for STALL endpoint and does not try to fill TX FIFO in that case.
.. figure:: docs/assets/logo.svg :alt: TinyUSB |Build Status| |Documentation Status| |License| TinyUSB is an open-source cross-platform USB Host/Device stack for embedded system, designed to be memory-safe with no dynamic allocation and thread-safe with all interrupt events are deferred then handled in the non-ISR task function. Please take a look at the online `documentation <https://docs.tinyusb.org/>`__. .. figure:: docs/assets/stack.svg :width: 500px :alt: stackup :: . ├── docs # Documentation ├── examples # Sample with Makefile build support ├── hw │ ├── bsp # Supported boards source files │ └── mcu # Low level mcu core & peripheral drivers ├── lib # Sources from 3rd party such as freeRTOS, fatfs ... ├── src # All sources files for TinyUSB stack itself. ├── test # Unit tests for the stack └── tools # Files used internally Supported MCUs ============== The stack supports the following MCUs: - **Dialog:** DA1469x - **Espressif:** ESP32-S2, ESP32-S3 - **MicroChip:** SAMD11, SAMD21, SAMD51, SAME5x, SAMG55, SAML21, SAML22, SAME7x - **NordicSemi:** nRF52833, nRF52840 - **Nuvoton:** NUC120, NUC121/NUC125, NUC126, NUC505 - **NXP:** - iMX RT Series: RT1011, RT1015, RT1021, RT1052, RT1062, RT1064 - Kinetis: KL25, K32L2Bxx - LPC Series: 11u, 13, 15, 17, 18, 40, 43, 51u, 54, 55 - **Raspberry Pi:** RP2040 - **Renesas:** RX63N, RX65N - **Silabs:** EFM32GG12 - **Sony:** CXD56 - **ST:** STM32 series: L0, L1, F0, F1, F2, F3, F4, F7, H7 both FullSpeed and HighSpeed - **TI:** MSP430 - **ValentyUSB:** eptri Here is the list of `Supported Devices`_ that can be used with provided examples. Device Stack ============ Supports multiple device configurations by dynamically changing USB descriptors, low power functions such like suspend, resume, and remote wakeup. The following device classes are supported: - Audio Class 2.0 (UAC2) - Bluetooth Host Controller Interface (BTH HCI) - Communication Device Class (CDC) - Device Firmware Update (DFU): DFU mode (WIP) and Runtinme - Human Interface Device (HID): Generic (In & Out), Keyboard, Mouse, Gamepad etc ... - Mass Storage Class (MSC): with multiple LUNs - Musical Instrument Digital Interface (MIDI) - Network with RNDIS, Ethernet Control Model (ECM), Network Control Model (NCM) - Test and Measurement Class (USBTMC) - Video class 1.5 (UVC): work in progress - Vendor-specific class support with generic In & Out endpoints. Can be used with MS OS 2.0 compatible descriptor to load winUSB driver without INF file. - `WebUSB <https://github.com/WICG/webusb>`__ with vendor-specific class If you have a special requirement, `usbd_app_driver_get_cb()` can be used to write your own class driver without modifying the stack. Here is how the RPi team added their reset interface [raspberrypi/pico-sdk#197](https://github.com/raspberrypi/pico-sdk/pull/197) Host Stack ========== - Human Interface Device (HID): Keyboard, Mouse, Generic - Mass Storage Class (MSC) - Hub currently only supports 1 level of hub (due to my laziness) OS Abstraction layer ==================== TinyUSB is completely thread-safe by pushing all Interrupt Service Request (ISR) events into a central queue, then processing them later in the non-ISR context task function. It also uses semaphore/mutex to access shared resources such as Communication Device Class (CDC) FIFO. Therefore the stack needs to use some of the OS's basic APIs. Following OSes are already supported out of the box. - **No OS** - **FreeRTOS** - **Mynewt** Due to the newt package build system, Mynewt examples are better to be on its [own repo](https://github.com/hathach/mynewt-tinyusb-example) Local Docs ========== - Info - `Uses`_ - `Changelog`_ - `Contributors`_ - `Reference`_ - `Supported Devices`_ - `Getting Started`_ - `Concurrency`_ - `Contributing`_ - `Code of Conduct`_ - `Structure`_ - `Porting`_ License ======= All TinyUSB sources in the ``src`` folder are licensed under MIT license, the `Full license is here <LICENSE>`__. However, each file can be individually licensed especially those in ``lib`` and ``hw/mcu`` folder. Please make sure you understand all the license term for files you use in your project. .. |Build Status| image:: https://github.com/hathach/tinyusb/workflows/Build/badge.svg :target: https://github.com/hathach/tinyusb/actions .. |Documentation Status| image:: https://readthedocs.org/projects/tinyusb/badge/?version=latest :target: https://docs.tinyusb.org/en/latest/?badge=latest .. |License| image:: https://img.shields.io/badge/license-MIT-brightgreen.svg :target: https://opensource.org/licenses/MIT .. _Uses: docs/info/uses.rst .. _Changelog: docs/info/changelog.rst .. _Contributors: CONTRIBUTORS.rst .. _Reference: docs/reference/index.rst .. _Supported Devices: docs/reference/supported.rst .. _Getting Started: docs/reference/getting_started.rst .. _Concurrency: docs/reference/concurrency.rst .. _Contributing: docs/contributing/index.rst .. _Code of Conduct: CODE_OF_CONDUCT.rst .. _Structure: docs/contributing/structure.rst .. _Porting: docs/contributing/porting.rst