From 868a0562be3ed398bed21643866f288e4ef09a4a Mon Sep 17 00:00:00 2001
From: shylie <shylie@shylie.info>
Date: Tue, 24 Feb 2026 20:16:18 -0500
Subject: [PATCH] Allow for resetting to USB bootsel via vendor-specific
 protocol

---
 CMakeLists.txt | 4 ++++
 src/main.cpp   | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 395b907..f633e01 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,4 +39,8 @@ target_link_libraries(mtgcard PUBLIC
   pico_unique_id
 )
 
+target_compile_definitions(mtgcard PRIVATE
+  PICO_ENTER_USB_BOOT_ON_EXIT=1
+)
+
 pico_add_extra_outputs(mtgcard)
diff --git a/src/main.cpp b/src/main.cpp
index 733ec79..7f1e192 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,6 +6,7 @@
 
 #include <hardware/clocks.h>
 #include <pico/binary_info.h>
+#include <pico/bootrom.h>
 #include <pico/stdlib.h>
 #include <tusb.h>
 
@@ -185,6 +186,12 @@ void tud_vendor_rx_cb(uint8_t itf, const uint8_t* buffer, uint16_t bufsize)
         return;
       }
 
+      // special command to reset to bootsel
+      if (buffer[0] == 0x99)
+      {
+        rom_reset_usb_boot(0, 0);
+      }
+
       rx.state = RX::GETTING_CMC;
 
       rx.card_index = CardSlot::get_unused(flash);