random.h File Reference

#include <zrtos/cast.h>
#include <zrtos/vfs_plugin.h>
#include <zrtos/vfs_file.h>

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Functions
zrtos_error_t	zrtos_vfs_module_random__on_open (zrtos_vfs_file_t *thiz)
zrtos_error_t	zrtos_vfs_module_random__on_read (zrtos_vfs_file_t *thiz, char *path, void *buf, size_t len, zrtos_vfs_offset_t offset, size_t *ret)
	ZRTOS_VFS_PLUGIN__INIT (random, ZRTOS_VFS_PLUGIN__0_ON_OPEN(zrtos_vfs_module_random__on_open) ZRTOS_VFS_PLUGIN__1_ON_CLOSE_DEFAULT() ZRTOS_VFS_PLUGIN__2_ON_MOUNT_DEFAULT() ZRTOS_VFS_PLUGIN__3_ON_UMOUNT_DEFAULT() ZRTOS_VFS_PLUGIN__4_ON_READ(zrtos_vfs_module_random__on_read) ZRTOS_VFS_PLUGIN__5_ON_WRITE_DEFAULT() ZRTOS_VFS_PLUGIN__6_ON_CAN_READ_DEFAULT() ZRTOS_VFS_PLUGIN__7_ON_CAN_WRITE_DEFAULT() ZRTOS_VFS_PLUGIN__8_ON_SEEK_DEFAULT() ZRTOS_VFS_PLUGIN__9_ON_IOCTL_DEFAULT())

Function Documentation

zrtos_vfs_module_random__on_open()

zrtos_error_t zrtos_vfs_module_random__on_open

(

zrtos_vfs_file_t *

thiz

)

Definition at line 19 of file random.h.

 {
    zrtos_vfs_file__set_offset(
         thiz
        ,(zrtos_vfs_offset_t)0xACE1
    );

    return ZRTOS_ERROR__SUCCESS;
}

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zrtos_vfs_module_random__on_read()

zrtos_error_t zrtos_vfs_module_random__on_read	(	zrtos_vfs_file_t *	thiz,
		char *	path,
		void *	buf,
		size_t	len,
		zrtos_vfs_offset_t	offset,
		size_t *	ret
	)

Definition at line 30 of file random.h.

 {
    uint16_t lfsr = (uint16_t)zrtos_vfs_file__get_offset(thiz);
    uint8_t  *buffer = ZRTOS_CAST(uint8_t*,buf);

    *ret = len;

    while(len--){
        lfsr ^= lfsr >> 7;
        lfsr ^= lfsr << 9;
        lfsr ^= lfsr >> 13;

        *buffer++ = (lfsr >> 4);
    }

    zrtos_vfs_file__set_offset(
         thiz
        ,(zrtos_vfs_offset_t)lfsr
    );

    return ZRTOS_ERROR__SUCCESS;
}

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ZRTOS_VFS_PLUGIN__INIT()

ZRTOS_VFS_PLUGIN__INIT	(	random	,
		ZRTOS_VFS_PLUGIN__0_ON_OPEN(zrtos_vfs_module_random__on_open) ZRTOS_VFS_PLUGIN__1_ON_CLOSE_DEFAULT() ZRTOS_VFS_PLUGIN__2_ON_MOUNT_DEFAULT() ZRTOS_VFS_PLUGIN__3_ON_UMOUNT_DEFAULT() ZRTOS_VFS_PLUGIN__4_ON_READ(zrtos_vfs_module_random__on_read) ZRTOS_VFS_PLUGIN__5_ON_WRITE_DEFAULT() ZRTOS_VFS_PLUGIN__6_ON_CAN_READ_DEFAULT() ZRTOS_VFS_PLUGIN__7_ON_CAN_WRITE_DEFAULT() ZRTOS_VFS_PLUGIN__8_ON_SEEK_DEFAULT() ZRTOS_VFS_PLUGIN__9_ON_IOCTL_DEFAULT()
	)

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