USART2 Namespace Reference

This namespace bundles a high-level buffered interface to the USART2 hardware. It provides logical cohesion and prevents namespace collisions. More...

Functions
void	start (unsigned long baudRate, UsartSerialConfiguration config=kSerial_8N1)
	Initialize USART2 for buffered, asynchronous serial communications using interrupts. More...
void	stop ()
	Stops buffered serial communications using interrupts on USART2. More...
size_t	write (char c)
	Write a single byte to the transmit buffer. More...
size_t	write (const char *c)
	Write a null-terminated string to the transmit buffer. More...
size_t	write (const char *c, size_t n)
	Write a character array of given size to the transmit buffer. More...
size_t	write (const uint8_t *c, size_t n)
	Write a byte array of given size to the transmit buffer. More...
void	flush ()
	Flush transmit buffer. More...
int	peek ()
	Examine the next character in the receive buffer without removing it from the buffer. More...
int	read ()
	Return the next character in the receive buffer, removing it from the buffer. More...
bool	available ()
	Determine if there is data in the receive buffer.. More...

Detailed Description

This namespace bundles a high-level buffered interface to the USART2 hardware. It provides logical cohesion and prevents namespace collisions.

Function Documentation

available()

bool USART2::available

(

)

Determine if there is data in the receive buffer..

Returns

if the receive buffer contains data, it returns TRUE; if the receive buffer is empty, it returns FALSE;

flush()

void USART2::flush

(

)

Flush transmit buffer.

This function blocks until the transmit buffer is empty and the last byte has been transmitted by USART2. flush() doesn't actually do anything to make the transmit happen; it simply waits for the transmission to complete.

peek()

int USART2::peek

(

)

Examine the next character in the receive buffer without removing it from the buffer.

Returns

if there is a value in the receive buffer, it returns the value (a number between 0 and 255); if the receive buffer is empty, it returns -1;

read()

int USART2::read

(

)

Return the next character in the receive buffer, removing it from the buffer.

Returns

if there is a value in the receive buffer, it returns the value (a number between 0 and 255) and removes the value from the receive buffer; if the receive buffer is empty, it returns -1;

start()

void USART2::start	(	unsigned long	baudRate,
		UsartSerialConfiguration	config = kSerial_8N1
	)

Initialize USART2 for buffered, asynchronous serial communications using interrupts.

You must call this function before using any of the other USART2 functions.

• baudRate the baud rate for the communications, usually one of the following values: 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200 (although other values below can be specified).

• config sets the configuration in term of data bits, parity, and stop bits. If omitted, the default is 8 data bits, no parity, and 1 stop bit.

stop()

void USART2::stop

(

)

Stops buffered serial communications using interrupts on USART2.

After calling this function, Arduino pins 0 and 1 are released and available for use as ordinary digital pins.

If you want to use USART2 again for buffered, asynchronous serial communications, you must again call start().

write() [1/4]

size_t USART2::write

(

char

c

)

Write a single byte to the transmit buffer.

This function attempts to queue the data into the transmit buffer. If there is room in the transmit buffer, the function returns immediately. If not, the function blocks waiting for room to become available in the transmit buffer.

The data is transmitted asynchronously via USART2-related interrupts.

• c the char (byte) to write into the transmit buffer

Returns

the number of bytes written into the output buffer.

write() [2/4]

size_t USART2::write

(

const char *

c

)

Write a null-terminated string to the transmit buffer.

This function attempts to queue the data into the transmit buffer. If there is room in the transmit buffer, the function returns immediately. If not, the function blocks waiting for room to become available in the transmit buffer.

The data is transmitted asynchronously via USART2-related interrupts.

• c the null-terminated string to write into the transmit buffer.

Returns

the number of bytes written into the output buffer.

write() [3/4]

size_t USART2::write	(	const char *	c,
		size_t	n
	)

Write a character array of given size to the transmit buffer.

This function attempts to queue the data into the transmit buffer. If there is room in the transmit buffer, the function returns immediately. If not, the function blocks waiting for room to become available in the transmit buffer.

The data is transmitted asynchronously via USART2-related interrupts

• c the character array to write into the transmit buffer.

• n the number of elements from the array to write into the transmit buffer.

Returns

the number of characters written into the output buffer.

write() [4/4]

size_t USART2::write	(	const uint8_t *	c,
		size_t	n
	)

Write a byte array of given size to the transmit buffer.

This function attempts to queue the data into the transmit buffer. If there is room in the transmit buffer, the function returns immediately. If not, the function blocks waiting for room to become available in the transmit buffer.

The data is transmitted asynchronously via USART2-related interrupts

• c the byte array to write into the transmit buffer.

• n the number of elements from the array to write into the transmit buffer.

Returns

the number of bytes written into the output buffer.