add circuitpython code

1 files changed, 57 insertions, 0 deletions

diff --git a/circuitpython/ports/raspberrypi/supervisor/usb.c b/circuitpython/ports/raspberrypi/supervisor/usb.c
new file mode 100644
index 0000000..d0e9b2e
--- /dev/null
+++ b/circuitpython/ports/raspberrypi/supervisor/usb.c
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "lib/tinyusb/src/device/usbd.h"
+#include "supervisor/background_callback.h"
+#include "supervisor/usb.h"
+#include "src/rp2_common/hardware_irq/include/hardware/irq.h"
+#include "src/rp2_common/pico_platform/include/pico/platform.h"
+#include "src/rp2040/hardware_regs/include/hardware/regs/intctrl.h"
+
+void init_usb_hardware(void) {
+}
+
+STATIC void _usb_irq_wrapper(void) {
+    usb_irq_handler(0);
+}
+
+void post_usb_init(void) {
+    irq_set_enabled(USBCTRL_IRQ, false);
+
+    irq_handler_t usb_handler = irq_get_exclusive_handler(USBCTRL_IRQ);
+    if (usb_handler) {
+        irq_remove_handler(USBCTRL_IRQ, usb_handler);
+    }
+    irq_set_exclusive_handler(USBCTRL_IRQ, _usb_irq_wrapper);
+
+    irq_set_enabled(USBCTRL_IRQ, true);
+
+    // There is a small window where the USB interrupt may be handled by the
+    // pico-sdk instead of CircuitPython. If that is the case, then we'll have
+    // USB events to process that we didn't queue up a background task for. So,
+    // queue one up here even if we might not have anything to do.
+    usb_background_schedule();
+}