mirror of
https://github.com/elua/elua.git
synced 2025-01-25 01:02:54 +08:00
e7702bb0e2
- FAT changed to support the new opendir/readdir/closedir mechanism, and to use lseek directly instead of ioctl (also fixed a bug in FAT's lseek that always returned 0 instead of file position). - ET-STM32 console moved to UART2@19200bps (to allow RFS to run on UART0). If UART0 is needee for console, remember to disable RFS. - freed 700+ bytes of RAM by changing the devman implementation to keep pointers instead of actual DM_DEVICE structures - other minor code changes and fixes
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
// Device manager interface for Newlib (stubs and additional IOCTL implementation)
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#ifndef __DEVMAN_H__
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#define __DEVMAN_H__
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#include "type.h"
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#include <reent.h>
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#include <unistd.h>
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// Maximum number of devices in the system
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#define DM_MAX_DEVICES 16
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#define DM_MAX_DEVICES_BITS 4
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// Maximum number of a device name
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#define DM_MAX_DEV_NAME 12
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// GLOBAL maximum file length (on ALL supported filesystem)
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#define DM_MAX_FNAME_LENGTH 30
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// Pack/unpack descriptions
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// Even if a file descriptor is an 'int', newlib treats it as a short, so we need to stuff
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// everything into 16 bits. Actually 15, since negative fd's are actually error indications
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#define DM_MAKE_DESC( devid, fd ) ( ( ( devid ) << ( 15 - DM_MAX_DEVICES_BITS ) ) | ( fd ) )
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#define DM_GET_DEVID( desc ) ( ( desc ) >> ( 15 - DM_MAX_DEVICES_BITS ) )
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#define DM_GET_FD( desc ) ( ( desc ) & ( ( 1 << ( 15 - DM_MAX_DEVICES_BITS ) ) - 1 ) )
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// STDIO file number
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#define DM_STDIN_NUM 0
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#define DM_STDOUT_NUM 1
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#define DM_STDERR_NUM 2
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// Our platform independent "dirent" structure (for opendir/readdir)
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struct dm_dirent {
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u32 fsize;
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const char *fname;
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u32 ftime;
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};
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typedef struct {
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u8 devid;
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void *userdata;
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} DM_DIR;
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// A device structure with pointers to all the device functions
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typedef struct
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{
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char name[ DM_MAX_DEV_NAME + 1 ];
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int ( *p_open_r )( struct _reent *r, const char *path, int flags, int mode );
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int ( *p_close_r )( struct _reent *r, int fd );
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_ssize_t ( *p_write_r ) ( struct _reent *r, int fd, const void *ptr, size_t len );
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_ssize_t ( *p_read_r )( struct _reent *r, int fd, void *ptr, size_t len );
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off_t ( *p_lseek_r )( struct _reent *r, int fd, off_t off, int whence );
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void* ( *p_opendir_r )( struct _reent *r, const char* name );
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struct dm_dirent* ( *p_readdir_r )( struct _reent *r, void *dir );
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int ( *p_closedir_r )( struct _reent *r, void* dir );
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} DM_DEVICE;
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// Errors
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#define DM_ERR_ALREADY_REGISTERED (-1)
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#define DM_ERR_NOT_REGISTERED (-2)
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#define DM_ERR_NO_SPACE (-3)
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#define DM_ERR_INVALID_NAME (-4)
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#define DM_ERR_NO_DEVICE (-5)
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#define DM_OK (0)
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// Add a device
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int dm_register( const DM_DEVICE *pdev );
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// Unregister a device
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int dm_unregister( const char* name );
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// Get a device entry
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const DM_DEVICE* dm_get_device_at( int idx );
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// Returns the number of registered devices
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int dm_get_num_devices();
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// Initialize device manager
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int dm_init();
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// DM specific functions (uniform over all the installed filesystems)
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DM_DIR *dm_opendir( const char* dirname );
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struct dm_dirent* dm_readdir( DM_DIR *d );
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int dm_closedir( DM_DIR *d );
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#endif
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