usb_serial.h

/* Teensyduino Core Library
 * http://www.pjrc.com/teensy/
 * Copyright (c) 2013 PJRC.COM, LLC.
 *
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 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * 1. The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 *
 * 2. If the Software is incorporated into a build system that allows 
 * selection among a list of target devices, then similar target
 * devices manufactured by PJRC.COM must be included in the list of
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 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 */

#ifndef USBserial_h_
#define USBserial_h_

#if defined(USB_SERIAL) || defined(USB_SERIAL_HID)

#include <inttypes.h>

// C language implementation
#ifdef __cplusplus
extern "C" {
#endif
int usb_serial_getchar(void);
int usb_serial_peekchar(void);
int usb_serial_available(void);
int usb_serial_read(void *buffer, uint32_t size);
void usb_serial_flush_input(void);
int usb_serial_putchar(uint8_t c);
int usb_serial_write(const void *buffer, uint32_t size);
void usb_serial_flush_output(void);
extern uint32_t usb_cdc_line_coding[2];
extern volatile uint8_t usb_cdc_line_rtsdtr;
extern volatile uint8_t usb_cdc_transmit_flush_timer;
extern volatile uint8_t usb_configuration;
#ifdef __cplusplus
}
#endif

#define USB_SERIAL_DTR  0x01
#define USB_SERIAL_RTS  0x02


// C++ interface
#ifdef __cplusplus
#include "Stream.h"
class usb_serial_class : public Stream
{
public:
        void begin(long) { /* TODO: call a function that tries to wait for enumeration */ };
        void end() { /* TODO: flush output and shut down USB port */ };
        virtual int available() { return usb_serial_available(); }
        virtual int read() { return usb_serial_getchar(); }
        virtual int peek() { return usb_serial_peekchar(); }
        virtual void flush() { usb_serial_flush_output(); }  // TODO: actually wait for data to leave USB...
        virtual size_t write(uint8_t c) { return usb_serial_putchar(c); }
        virtual size_t write(const uint8_t *buffer, size_t size) { return usb_serial_write(buffer, size); }
	size_t write(unsigned long n) { return write((uint8_t)n); }
	size_t write(long n) { return write((uint8_t)n); }
	size_t write(unsigned int n) { return write((uint8_t)n); }
	size_t write(int n) { return write((uint8_t)n); }
	using Print::write;
        void send_now(void) { usb_serial_flush_output(); }
        uint32_t baud(void) { return usb_cdc_line_coding[0]; }
        uint8_t stopbits(void) { uint8_t b = usb_cdc_line_coding[1]; if (!b) b = 1; return b; }
        uint8_t paritytype(void) { return usb_cdc_line_coding[1] >> 8; } // 0=none, 1=odd, 2=even
        uint8_t numbits(void) { return usb_cdc_line_coding[1] >> 16; }
        uint8_t dtr(void) { return (usb_cdc_line_rtsdtr & USB_SERIAL_DTR) ? 1 : 0; }
        uint8_t rts(void) { return (usb_cdc_line_rtsdtr & USB_SERIAL_RTS) ? 1 : 0; }
        operator bool() { return usb_configuration && (usb_cdc_line_rtsdtr & (USB_SERIAL_DTR | USB_SERIAL_RTS)); }
	size_t readBytes(char *buffer, size_t length) {
		size_t count=0;
		unsigned long startMillis = millis();
		do {
			count += usb_serial_read(buffer + count, length - count);
			if (count >= length) return count;
		} while(millis() - startMillis < _timeout);
		setReadError();
		return count;
	}

};

extern usb_serial_class Serial;

#endif // __cplusplus

#endif // USB_SERIAL || USB_SERIAL_HID
#endif // USBserial_h_