de6bf09f40
This commit fixes how the USB Host HCD handles sudden disconnections. Bugs: - HW channels remain active when the port suddenly disconnects, and previously the channel would be disabled by setting the disabled bit, then waiting for a disabled interrupt. However, ISOC channels do not generate the disabled interrupt when the port is invalid, thus leading to tasks getting indefinitely blocked in hcd_pipe_command(). Fix: On a sudden disconnection, forcibly treat all channels as halted even if their HCCHAR.ChEna bit is still set. We do a soft reset after a port error anyways, so the channels will eventually be reset. Closes https://github.com/espressif/esp-idf/issues/7505
HAL Layer Readme
The HAL layer is designed to be used by the drivers. We don't guarantee the stability and back-compatibility among versions. The HAL layer may update very frequently with the driver. Please don't use them in the applications or treat them as stable APIs.
The HAL layer consists of two layers: HAL (upper) and Lowlevel(bottom). The HAL layer defines the steps and data required by the peripheral. The lowlevel is a translation layer converting general conceptions to register configurations.
Lowlevel
This layer should be all static inline. The first argument of LL functions is usually a pointer to the beginning address of the peripheral register. Each chip should have its own LL layer. The functions in this layer should be atomic and independent from each other so that the upper layer can change/perform one of the options/operation without touching the others.
HAL
This layer should depend on the operating system as little as possible. It's a wrapping of LL functions, so that the upper layer can combine basic steps into different working ways (polling, non-polling, interrupt, etc.). Without using queues/locks/delay/loop/etc., this layer can be easily port to other os or simulation systems.
To get better performance and better porting ability, contexts are used to hold sustainable data and pass the parameters.
To develop your own driver, it is suggested to copy the HAL layer to your own code and keep them until manual update.