lpc176x: Initial support for serial over usb

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/generic/usb_cdc.h

@@ -0,0 +1,35 @@
+#ifndef __GENERIC_USB_CDC_H
+#define __GENERIC_USB_CDC_H
+
+#include <stdint.h> // uint_fast8_t
+
+enum {
+    USB_CDC_EP0_SIZE = 16,
+
+    // XXX - endpoint ids may need to changed per-board
+    USB_CDC_EP_ACM = 1,
+    USB_CDC_EP_ACM_SIZE = 8,
+
+    USB_CDC_EP_BULK_OUT = 2,
+    USB_CDC_EP_BULK_OUT_SIZE = 64,
+
+    USB_CDC_EP_BULK_IN = 5,
+    USB_CDC_EP_BULK_IN_SIZE = 64,
+};
+
+// callbacks provided by board specific code
+int_fast8_t usb_read_bulk_out(void *data, uint_fast8_t max_len);
+int_fast8_t usb_send_bulk_in(void *data, uint_fast8_t len);
+int_fast8_t usb_read_setup(void *data, uint_fast8_t max_len);
+int_fast8_t usb_send_setup(const void *data, uint_fast8_t len);
+void usb_send_pgm_setup(void *data, uint_fast8_t len);
+void usb_set_stall(void);
+void usb_set_address(uint_fast8_t addr);
+void usb_set_configure(void);
+
+// usb_cdc.c
+void usb_notify_bulk_in(void);
+void usb_notify_bulk_out(void);
+void usb_notify_setup(void);
+
+#endif // usb_cdc.h