USB Input / Output

Functions for USB input / output. More...

Defines
#define	USB_BAUD   115200
	the USB baud rate
Functions
void	usb_init (void)
	Initialize the USB.
int	usb_putc (char c)
	Print a character to USB.
int	usb_getc (void)
	Read a character from USB.
int	usb_getc_nb (char *c)
	Read a character from USB without blocking.
int	usb_puts (char *s)
	Print a string to USB.
int	usb_puti (int value)
	Print an integer to USB.

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Detailed Description

Functions for USB input / output.

Low level functions for USB input and output.

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Function Documentation

int usb_getc

(

void

)

Read a character from USB.

Returns the first character in the buffer received from USB. This function blocks execution until a character has been received. xbee_init must be called before this function may be used.

Returns:

the first character in the usb buffer

See also:

usb_init, usb_getc_nb

int usb_getc_nb

(

char *

c

)

Read a character from USB without blocking.

Non blocking version of usb_getc. If a character is present in the buffer, it is returned, otherwise -1 is returned immediately. usb_init must be called before this function can be used.

Parameters:

c

the received character. This will be set if a character has been received.

Returns:

-1 if no character is available, 0 otherwise

See also:

usb_init, usb_getc

void usb_init

(

void

)

Initialize the USB.

Initializes communication over the USB serial port. This must be called before any other usb function may be used.

int usb_putc

(

char

c

)

Print a character to USB.

Sends a character over USB.

Parameters:

c

the character to send

Returns:

0 for success, nonzero for failure

int usb_puti

(

int

value

)

Print an integer to USB.

Prints an integer, converted to ASCII, to usb. usb_init must be called before this function can be used.

Parameters:

value

the integer to print

Returns:

0 if successful, nonzero otherwise

See also:

usb_init, usb_putc

int usb_puts

(

char *

s

)

Print a string to USB.

Sends a sequence of characters over USB.

Parameters:

s

the string to send

Returns:

0 for success, nonzero for failure

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