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.
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
#include "boot_target_select.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace grub_boot_switch {
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static const char *const TAG = "grub_boot_switch.select";
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void BootTargetSelect::setup() {
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// Publish the current state from the parent so HA reflects whatever was
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// restored from NVS / set_initial_target.
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if (parent_ != nullptr) {
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auto label = parent_->label_for_digit(parent_->get_target());
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if (!label.empty())
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this->publish_state(label);
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// Mirror future external set_target() calls (REST/automation/MQTT) into
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// the select's reported state.
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parent_->add_on_target_change([this](uint8_t digit) {
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auto l = this->parent_->label_for_digit(digit);
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if (!l.empty())
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this->publish_state(l);
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});
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}
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}
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void BootTargetSelect::control(const std::string &value) {
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if (parent_ == nullptr)
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return;
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uint8_t digit = 0;
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if (!parent_->digit_for_label(value, &digit)) {
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ESP_LOGW(TAG, "control: unknown option '%s'", value.c_str());
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return;
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}
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parent_->set_target(digit);
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// The parent will fire add_on_target_change → publish_state, but if the
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// target was already at this digit no callback fires; publish anyway so
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// HA's optimistic state stays in sync.
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this->publish_state(value);
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}
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} // namespace grub_boot_switch
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} // namespace esphome
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