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e2ceb2b1f7
chunks_exact() can be handled by the compiler more efficiently. Previous code was making a memcpy call for each 4 byte chunk slice. Hoisting the fifo out of the loop avoids recalculating the pointer each time. In my benchmark I see a jump from ~13 megabyte/sec to ~25MB/sec after this change (opt-level=3). opt-level = "z" goes 9MB/s to 18MB/s. The benchmark was on a stm32h7s3l8, 600mhz clock, 512 byte bulk writes, data in DTCM. The benchmark isn't just USB writes, also has some unrelated memcpys for packet construction.
Embassy USB driver for the Synopsys USB OTG core
This crate implements embassy-usb-driver for Synopsys USB OTG devices.
It contains the "core" of the driver that is common across all chips using the Synopsys OTG IP, but it doesn't contain chip-specific initialization such as clock setup and GPIO muxing. You most likely don't want to use this crate directly, but use it through a HAL that does the initialization for you.
List of HALs integrating this driver:
embassy-stm32, for STMicroelectronics STM32 chips.esp-hal, for Espressif ESP32 chips.
If you wish to integrate this crate into your device's HAL, you will need to add the device-specific initialization. See the above crates for examples on how to do it.