Add persistent USB output mode selection

tests/mode_native_stubs/hardware/structs/watchdog.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdint.h>
+
+struct watchdog_hw_t {
+    uint32_t scratch[8];
+};
+
+extern watchdog_hw_t* watchdog_hw;

tests/mode_native_stubs/hardware/watchdog.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <stdint.h>
+
+void watchdog_reboot(uint32_t pc, uint32_t sp, uint32_t delay_ms);

tests/mode_native_stubs/pico/time.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef int32_t alarm_id_t;
+typedef uint64_t absolute_time_t;
+typedef int64_t (*alarm_callback_t)(alarm_id_t alarm_id, void* user_data);
+
+absolute_time_t get_absolute_time();
+uint64_t to_ms_since_boot(absolute_time_t time);
+alarm_id_t add_alarm_in_ms(int64_t delay_ms, alarm_callback_t callback,
+                           void* user_data, bool fire_if_past);

tests/mode_native_stubs/tusb.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+enum {
+    CONTROL_STAGE_SETUP = 0,
+    CONTROL_STAGE_DATA = 1,
+    CONTROL_STAGE_ACK = 2,
+    TUSB_REQ_RCPT_DEVICE = 0,
+    TUSB_DIR_OUT = 0,
+    TUSB_REQ_TYPE_VENDOR = 2,
+    TUSB_DIR_IN = 1,
+};
+
+struct tusb_request_type_bits_t {
+    uint8_t recipient;
+    uint8_t type;
+    uint8_t direction;
+};
+
+struct tusb_control_request_t {
+    tusb_request_type_bits_t bmRequestType_bit;
+    uint8_t bRequest;
+    uint16_t wValue;
+    uint16_t wIndex;
+    uint16_t wLength;
+};
+void tusb_init();
+
+bool tud_control_xfer(uint8_t rhport,
+                      const tusb_control_request_t* request,
+                      void* buffer, uint16_t length);