adamksmith
a911b9e4cb
ESPHome external_component that presents a synthetic 64 KB FAT12 disk over the ESP32-S3's native USB-OTG, containing a one-byte switch_position file and a switch_position_grub.cfg snippet. The disk's volume serial is fixed at 0x55AA6922 to stay drop-in compatible with the upstream /etc/grub.d hook. Components: - fat12 / msc_disk: portable FAT12 sector synthesiser ported from reference/src/fat.c and the boot-sector / FAT / dir-entry generation in reference/src/usb.c. - usb_descriptors / tusb_glue: TinyUSB MSC class with our own callbacks delegating to MscDisk::read_lba (linker --allow-multiple-definition picks ours over esp_tinyusb's storage-backed defaults). - grub_boot_switch: top-level Component, NVS persistence on target changes, exposes targets table to sub-platforms. - select: HA-facing select platform reading parent's targets map. Validated end-to-end on an ESP32-S3-DevKitC-1: USB enumerates as 26ba:8003, /dev/sdb mounts FAT12, mtype reads back the live target, and POST /select/boot_target/set?option=Windows updates both files on the next host read.
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#pragma once
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#include <stdint.h>
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#include <stddef.h>
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namespace esphome {
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namespace grub_boot_switch {
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#define WBVAL(x) ((x) & 0xFF), (((x) >> 8) & 0xFF)
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#define QBVAL(x) ((x) & 0xFF), (((x) >> 8) & 0xFF), (((x) >> 16) & 0xFF), (((x) >> 24) & 0xFF)
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constexpr uint8_t FAT_MEDIA_FIXED_DISK = 0xF8;
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constexpr uint8_t FAT_NAME_LEN = 8;
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constexpr uint8_t FAT_EXT_LEN = 3;
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enum FatFileAttributes : uint8_t {
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kFatAttr_ReadOnly = 0x01,
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kFatAttr_Hidden = 0x02,
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kFatAttr_System = 0x04,
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kFatAttr_VolumeLabel = 0x08,
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kFatAttr_Subdirectory = 0x10,
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kFatAttr_Archive = 0x20,
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kFatAttr_LongFileName = 0x0F,
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};
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enum FatOrdinalFlags : uint8_t {
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kFat_LastLFN = 0x40,
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kFat_DeletedLFN = 0x80,
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};
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struct FatDirEntry {
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char name[FAT_NAME_LEN];
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char ext[FAT_EXT_LEN];
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uint8_t attrs;
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uint8_t type;
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uint8_t ctime_ms;
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uint16_t ctime;
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uint16_t cdate;
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uint16_t adate;
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uint16_t ea_index;
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uint16_t mtime;
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uint16_t mdate;
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uint16_t start;
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uint32_t size;
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} __attribute__((packed));
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uint8_t fat_write_lfn(const char *name, const FatDirEntry *direntry, uint8_t *output);
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uint8_t fat_write_dir(const FatDirEntry *direntry, uint8_t *output);
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uint16_t fat_date(uint16_t year, uint8_t month, uint8_t day);
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} // namespace grub_boot_switch
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} // namespace esphome
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