SDIO Device Drivers

• include/nuttx/sdio.h. All structures and APIs needed to work with SDIO drivers are provided in this header file.

• struct sdio_dev_s. Each SDIO device driver must implement an instance of struct sdio_dev_s. That structure defines a call table with the following methods:

  Mutual exclusion:

  Initialization/setup:

  Command/Status/Data Transfer:

  Event/Callback support:

  DMA support:

• Binding SDIO Drivers. SDIO drivers are not normally directly accessed by user code, but are usually bound to another, higher level device driver. In general, the binding sequence is:

  1. Get an instance of struct sdio_dev_s from the hardware-specific SDIO device driver, and

  2. Provide that instance to the initialization method of the higher level device driver.

• Examples: arch/arm/src/stm32/stm32_sdio.c and drivers/mmcsd/mmcsd_sdio.c