FLASH device API

This section describes the API between the FLASH IO library the FLASH device drivers.

The FLASH device Structure

This structure keeps all the information about a single driver.

struct cyg_flash_dev {
  const struct cyg_flash_dev_funs *funs;            // Function pointers
  cyg_uint32                      flags;            // Device characteristics
  cyg_flashaddr_t                 start;            // First address
  cyg_flashaddr_t                 end;              // Last address
  cyg_uint32                      num_block_infos;  // Number of entries
  const cyg_flash_block_info_t    *block_info;      // Info about one block size

  const void                      *priv;            // Devices private data

  // The following are only written to by the FLASH IO layer.
  cyg_flash_printf                *pf;              // Pointer to diagnostic printf
  bool                            init;             // Device has been initialised
#ifdef CYGPKG_KERNEL
  cyg_mutex_t                     mutex;            // Mutex for thread safeness
#endif
#if (CYGHWR_IO_FLASH_DEVICE > 1)    
  struct cyg_flash_dev            *next;            // Pointer to next device
#endif    
};

struct cyg_flash_dev_funs {
  int     (*flash_init) (struct cyg_flash_dev *dev);
  size_t  (*flash_query) (struct cyg_flash_dev *dev, void * data, size_t len);
  int     (*flash_erase_block) (struct cyg_flash_dev *dev, cyg_flashaddr_t block_base);
  int     (*flash_program) (struct cyg_flash_dev *dev, cyg_flashaddr_t base, const void* data, size_t len);
  int     (*flash_read) (struct cyg_flash_dev *dev, const cyg_flashaddr_t base, void* data, size_t len);
#ifdef CYGHWR_IO_FLASH_BLOCK_LOCKING    
  int     (*flash_block_lock) (struct cyg_flash_dev *dev, const cyg_flashaddr_t block_base);
  int     (*flash_block_unlock) (struct cyg_flash_dev *dev, const cyg_flashaddr_t block_base);
#endif    
};

The FLASH IO layer will only pass requests for operations on a single block.

2017-02-09
Documentation license for this page: Open Publication License