+#define AO_USB_CONTROL_EP 0
+#define AO_USB_INT_EP 1
+#define AO_USB_OUT_EP 4
+#define AO_USB_IN_EP 5
+#define AO_USB_CONTROL_SIZE 32
+/*
+ * Double buffer IN and OUT EPs, so each
+ * gets half of the available space
+ *
+ * Ah, but USB bulk packets can only come in 8, 16, 32 and 64
+ * byte sizes, so we'll use 64 for everything
+ */
+#define AO_USB_IN_SIZE 64
+#define AO_USB_OUT_SIZE 64
+
+#define AO_USB_EP0_IDLE 0
+#define AO_USB_EP0_DATA_IN 1
+#define AO_USB_EP0_DATA_OUT 2
+
+#define LE_WORD(x) ((x)&0xFF),((uint8_t) (((uint16_t) (x))>>8))
+
+/* CDC definitions */
+#define CS_INTERFACE 0x24
+#define CS_ENDPOINT 0x25
+
+#define SET_LINE_CODING 0x20
+#define GET_LINE_CODING 0x21
+#define SET_CONTROL_LINE_STATE 0x22
+
+/* Data structure for GET_LINE_CODING / SET_LINE_CODING class requests */
+struct ao_usb_line_coding {
+ uint32_t rate;
+ uint8_t char_format;
+ uint8_t parity;
+ uint8_t data_bits;
+} ;
+