usb_msc_bounds.h File Reference

#include <stdint.h>
#include <stdbool.h>

Go to the source code of this file.

Functions
static bool	usb_msc_range_ok (uint64_t total_bytes, uint16_t block_size, uint32_t lba, uint32_t offset, uint32_t len, bool is_write)
	Validates an MSC block access against the volume geometry.
static bool	usb_msc_should_remount (bool prev, bool cur)
	Whether a host-active transition should trigger a badge remount.

Function Documentation

usb_msc_range_ok()

bool usb_msc_range_ok ( uint64_t total_bytes, uint16_t block_size, uint32_t lba, uint32_t offset, uint32_t len, bool is_write )

inlinestatic

Validates an MSC block access against the volume geometry.

Reads may use any offset/length within bounds. Writes must be sector-aligned (offset 0 and length a whole number of blocks), matching the erase-then-write wear-levelling semantics.

Parameters

total_bytes	Total accessible volume size.
block_size	Logical block (sector) size.
lba	Logical block address.
offset	Byte offset inside the block.
len	Access length in bytes.
is_write	True for a write access (stricter alignment).

Returns

true when the access is in range and (for writes) aligned.

Definition at line 26 of file usb_msc_bounds.h.

Referenced by cdc::plugin_manager::PluginStorage::blockRead(), and cdc::plugin_manager::PluginStorage::blockWrite().

usb_msc_should_remount()

bool usb_msc_should_remount ( bool prev, bool cur )

inlinestatic

Whether a host-active transition should trigger a badge remount.

Only the active->inactive edge (host detached) refreshes the FATFS view so host-written files become visible.

Parameters

prev	Previous host-active state.
cur	New host-active state.

Returns

true when the volume should be remounted.

Definition at line 45 of file usb_msc_bounds.h.

Referenced by cdc::plugin_manager::PluginStorage::setHostActive().