--- /dev/null
+#ifndef usb_serial_h__
+#define usb_serial_h__
+
+#include <stdint.h>
+
+void usb_init(void); // initialize everything
+uint8_t usb_configured(void); // is the USB port configured
+
+int8_t usb_keyboard_press(uint8_t key, uint8_t modifier);
+int8_t usb_keyboard_send(void);
+extern uint8_t keyboard_modifier_keys;
+extern uint8_t keyboard_keys[6];
+extern volatile uint8_t keyboard_leds;
+
+// This file does not include the HID debug functions, so these empty
+// macros replace them with nothing, so users can compile code that
+// has calls to these functions.
+#define usb_debug_putchar(c)
+#define usb_debug_flush_output()
+
+
+#define KEY_CTRL 0x01
+#define KEY_SHIFT 0x02
+#define KEY_ALT 0x04
+#define KEY_GUI 0x08
+#define KEY_LEFT_CTRL 0x01
+#define KEY_LEFT_SHIFT 0x02
+#define KEY_LEFT_ALT 0x04
+#define KEY_LEFT_GUI 0x08
+#define KEY_RIGHT_CTRL 0x10
+#define KEY_RIGHT_SHIFT 0x20
+#define KEY_RIGHT_ALT 0x40
+#define KEY_RIGHT_GUI 0x80
+
+#define KEY_A 4
+#define KEY_B 5
+#define KEY_C 6
+#define KEY_D 7
+#define KEY_E 8
+#define KEY_F 9
+#define KEY_G 10
+#define KEY_H 11
+#define KEY_I 12
+#define KEY_J 13
+#define KEY_K 14
+#define KEY_L 15
+#define KEY_M 16
+#define KEY_N 17
+#define KEY_O 18
+#define KEY_P 19
+#define KEY_Q 20
+#define KEY_R 21
+#define KEY_S 22
+#define KEY_T 23
+#define KEY_U 24
+#define KEY_V 25
+#define KEY_W 26
+#define KEY_X 27
+#define KEY_Y 28
+#define KEY_Z 29
+#define KEY_1 30
+#define KEY_2 31
+#define KEY_3 32
+#define KEY_4 33
+#define KEY_5 34
+#define KEY_6 35
+#define KEY_7 36
+#define KEY_8 37
+#define KEY_9 38
+#define KEY_0 39
+#define KEY_ENTER 40
+#define KEY_ESC 41
+#define KEY_BACKSPACE 42
+#define KEY_TAB 43
+#define KEY_SPACE 44
+#define KEY_MINUS 45
+#define KEY_EQUAL 46
+#define KEY_LEFT_BRACE 47
+#define KEY_RIGHT_BRACE 48
+#define KEY_BACKSLASH 49
+#define KEY_NUMBER 50
+#define KEY_SEMICOLON 51
+#define KEY_QUOTE 52
+#define KEY_TILDE 53
+#define KEY_COMMA 54
+#define KEY_PERIOD 55
+#define KEY_SLASH 56
+#define KEY_CAPS_LOCK 57
+#define KEY_F1 58
+#define KEY_F2 59
+#define KEY_F3 60
+#define KEY_F4 61
+#define KEY_F5 62
+#define KEY_F6 63
+#define KEY_F7 64
+#define KEY_F8 65
+#define KEY_F9 66
+#define KEY_F10 67
+#define KEY_F11 68
+#define KEY_F12 69
+#define KEY_PRINTSCREEN 70
+#define KEY_SCROLL_LOCK 71
+#define KEY_PAUSE 72
+#define KEY_INSERT 73
+#define KEY_HOME 74
+#define KEY_PAGE_UP 75
+#define KEY_DELETE 76
+#define KEY_END 77
+#define KEY_PAGE_DOWN 78
+#define KEY_RIGHT 79
+#define KEY_LEFT 80
+#define KEY_DOWN 81
+#define KEY_UP 82
+#define KEY_NUM_LOCK 83
+#define KEYPAD_SLASH 84
+#define KEYPAD_ASTERIX 85
+#define KEYPAD_MINUS 86
+#define KEYPAD_PLUS 87
+#define KEYPAD_ENTER 88
+#define KEYPAD_1 89
+#define KEYPAD_2 90
+#define KEYPAD_3 91
+#define KEYPAD_4 92
+#define KEYPAD_5 93
+#define KEYPAD_6 94
+#define KEYPAD_7 95
+#define KEYPAD_8 96
+#define KEYPAD_9 97
+#define KEYPAD_0 98
+#define KEYPAD_PERIOD 99
+
+
+
+
+// Everything below this point is only intended for usb_serial.c
+#ifdef USB_SERIAL_PRIVATE_INCLUDE
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+
+#define EP_TYPE_CONTROL 0x00
+#define EP_TYPE_BULK_IN 0x81
+#define EP_TYPE_BULK_OUT 0x80
+#define EP_TYPE_INTERRUPT_IN 0xC1
+#define EP_TYPE_INTERRUPT_OUT 0xC0
+#define EP_TYPE_ISOCHRONOUS_IN 0x41
+#define EP_TYPE_ISOCHRONOUS_OUT 0x40
+
+#define EP_SINGLE_BUFFER 0x02
+#define EP_DOUBLE_BUFFER 0x06
+
+#define EP_SIZE(s) ((s) == 64 ? 0x30 : \
+ ((s) == 32 ? 0x20 : \
+ ((s) == 16 ? 0x10 : \
+ 0x00)))
+
+#define MAX_ENDPOINT 4
+
+#define LSB(n) (n & 255)
+#define MSB(n) ((n >> 8) & 255)
+
+#if defined(__AVR_AT90USB162__)
+#define HW_CONFIG()
+#define PLL_CONFIG() (PLLCSR = ((1<<PLLE)|(1<<PLLP0)))
+#define USB_CONFIG() (USBCON = (1<<USBE))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#elif defined(__AVR_ATmega32U4__)
+#define HW_CONFIG() (UHWCON = 0x01)
+#define PLL_CONFIG() (PLLCSR = 0x12)
+#define USB_CONFIG() (USBCON = ((1<<USBE)|(1<<OTGPADE)))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#elif defined(__AVR_AT90USB646__)
+#define HW_CONFIG() (UHWCON = 0x81)
+#define PLL_CONFIG() (PLLCSR = 0x1A)
+#define USB_CONFIG() (USBCON = ((1<<USBE)|(1<<OTGPADE)))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#elif defined(__AVR_AT90USB1286__)
+#define HW_CONFIG() (UHWCON = 0x81)
+#define PLL_CONFIG() (PLLCSR = 0x16)
+#define USB_CONFIG() (USBCON = ((1<<USBE)|(1<<OTGPADE)))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#endif
+
+// standard control endpoint request types
+#define GET_STATUS 0
+#define CLEAR_FEATURE 1
+#define SET_FEATURE 3
+#define SET_ADDRESS 5
+#define GET_DESCRIPTOR 6
+#define GET_CONFIGURATION 8
+#define SET_CONFIGURATION 9
+#define GET_INTERFACE 10
+#define SET_INTERFACE 11
+// HID (human interface device)
+#define HID_GET_REPORT 1
+#define HID_GET_IDLE 2
+#define HID_GET_PROTOCOL 3
+#define HID_SET_REPORT 9
+#define HID_SET_IDLE 10
+#define HID_SET_PROTOCOL 11
+// CDC (communication class device)
+#define CDC_SET_LINE_CODING 0x20
+#define CDC_GET_LINE_CODING 0x21
+#define CDC_SET_CONTROL_LINE_STATE 0x22
+#endif
+#endif
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