2b7681ec4f
There used to be dummy phase before out phase in common command transactions. This corrupts the data. The code before never actually operate (clear) the QE bit, once it finds the QE bit is set. It's hard to check whether the QE set/disable functions work well. This commit: 1. Cancel the dummy phase 2. Set and clear the QE bit according to chip settings, allowing tests for QE bits. However for some chips (Winbond for example), it's not forced to clear the QE bit if not able to. 3. Also refactor to allow chip_generic and other chips to share the same code to read and write qe bit; let common command and read command share configure_host_io_mode. 4. Rename read mode to io mode since maybe we will write data with quad mode one day. |
||
|---|---|---|
| .. | ||
| esp_flash_err.h | ||
| hal_defs.h | ||
| readme.md | ||
| spi_flash_hal.h | ||
| spi_flash_types.h | ||
| spi_hal.h | ||
| spi_ll.h | ||
| spi_slave_hal.h | ||
| spi_types.h | ||
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.