usb_serial.h

#ifndef usb_serial_h__
#define usb_serial_h__

#include <stdint.h>

// setup
void usb_init(void);                    // initialize everything
uint8_t usb_configured(void);           // is the USB port configured
void usb_detach(void);                          // Detach USB interface

// receiving data
int16_t usb_serial_getchar(void);       // receive a character (-1 if timeout/error)
uint8_t usb_serial_available(void);     // number of bytes in receive buffer
void usb_serial_flush_input(void);      // discard any buffered input

// transmitting data
int8_t usb_serial_putchar(uint8_t c);   // transmit a character
int8_t usb_serial_putchar_nowait(uint8_t c);  // transmit a character, do not wait
int8_t usb_serial_write(const uint8_t *buffer, uint16_t size); // transmit a buffer
void usb_serial_flush_output(void);     // immediately transmit any buffered output

// serial parameters
uint32_t usb_serial_get_baud(void);     // get the baud rate
uint8_t usb_serial_get_stopbits(void);  // get the number of stop bits
uint8_t usb_serial_get_paritytype(void);// get the parity type
uint8_t usb_serial_get_numbits(void);   // get the number of data bits
uint8_t usb_serial_get_control(void);   // get the RTS and DTR signal state
int8_t usb_serial_set_control(uint8_t signals); // set DSR, DCD, RI, etc

// constants corresponding to the various serial parameters
#define USB_SERIAL_DTR                  0x01
#define USB_SERIAL_RTS                  0x02
#define USB_SERIAL_1_STOP               0
#define USB_SERIAL_1_5_STOP             1
#define USB_SERIAL_2_STOP               2
#define USB_SERIAL_PARITY_NONE          0
#define USB_SERIAL_PARITY_ODD           1
#define USB_SERIAL_PARITY_EVEN          2
#define USB_SERIAL_PARITY_MARK          3
#define USB_SERIAL_PARITY_SPACE         4
#define USB_SERIAL_DCD                  0x01
#define USB_SERIAL_DSR                  0x02
#define USB_SERIAL_BREAK                0x04
#define USB_SERIAL_RI                   0x08
#define USB_SERIAL_FRAME_ERR            0x10
#define USB_SERIAL_PARITY_ERR           0x20
#define USB_SERIAL_OVERRUN_ERR          0x40

// 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()



// 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_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