From cec0c36c6bade2106fba5e4bb1ea0180b1aef6a6 Mon Sep 17 00:00:00 2001
From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Mon, 17 Jun 2019 21:51:36 +0200
Subject: [PATCH] common: Implement USB_DeviceIsrEnable() and
 USB_DeviceClockInit().

These functions are required by the C implementation.
---
 src/common/usb_serial.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/common/usb_serial.rs b/src/common/usb_serial.rs
index f08f679..c9de0d4 100644
--- a/src/common/usb_serial.rs
+++ b/src/common/usb_serial.rs
@@ -21,6 +21,9 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+use nvic;
+use clock;
+
 extern {
     fn USB_VcomInit();
 }
@@ -28,3 +31,21 @@ extern {
 pub unsafe fn init() {
     USB_VcomInit();
 }
+
+#[no_mangle]
+#[allow(non_snake_case)]
+pub unsafe extern fn USB_DeviceIsrEnable()
+{
+    let irq_number = 24; // USB0
+    let irq_prio = 3; // Stolen from NXP example.
+
+    nvic::set_priority(irq_number, irq_prio);
+    nvic::enable_irq(irq_number);
+}
+
+#[no_mangle]
+#[allow(non_snake_case)]
+pub unsafe extern fn USB_DeviceClockInit()
+{
+    clock::configure_usb();
+}
-- 
2.30.2