usb_msc.h

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// USB Mass Storage (MSC) block-device glue.
//
// usb_badge owns the TinyUSB MSC class callbacks but stays free of any storage
// dependency: a module (mod_msc) wires the LUN to the vfat wear-levelling
// volume by installing this backend. With no backend installed the LUN reports
// "not ready" and the host sees no usable medium.
 
#pragma once
 
#include <stdbool.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    bool     (*read)(uint32_t lba, uint32_t offset, void* buf, uint32_t len);
    bool     (*write)(uint32_t lba, uint32_t offset, const void* buf, uint32_t len);
    uint64_t (*total_bytes)(void);
    uint16_t (*block_size)(void);
    void     (*set_host_active)(bool active);
} usb_msc_backend_t;

void usb_msc_set_backend(const usb_msc_backend_t* backend);
 
#ifdef __cplusplus
}
#endif