USB Device Interface (UDI) for Communication Class Device (CDC)

Common APIs used by high level application to use this USB class.

These routines are used to transfer and control data to/from USB CDC endpoint.

See Quick start guide for USB device Communication Class Device module (UDI CDC).

Modules
	Related Project(s)
	In this section you can find all the projects related to the USB Device Interface (UDI) for Communication Class Device (CDC).
	Quick Start Guide(s)
	In this section you can find a list of all Quick Start guides related to the USB Device Interface (UDI) for Communication Class Device (CDC).
	Interface with USB Device Core (UDC)
	Structures and functions required by UDC.
	Implementation of UDI CDC
	Class internal implementation.
	USB interface descriptors
	The following structures provide predefined USB interface descriptors.

Interface for application with single CDC interface support
void	udi_cdc_ctrl_signal_dcd (bool b_set)
	Notify a state change of DCD signal. More...
void	udi_cdc_ctrl_signal_dsr (bool b_set)
	Notify a state change of DSR signal. More...
void	udi_cdc_signal_framing_error (void)
	Notify a framing error. More...
void	udi_cdc_signal_parity_error (void)
	Notify a parity error. More...
void	udi_cdc_signal_overrun (void)
	Notify a overrun. More...
iram_size_t	udi_cdc_get_nb_received_data (void)
	Gets the number of byte received. More...
bool	udi_cdc_is_rx_ready (void)
	This function checks if a character has been received on the CDC line. More...
int	udi_cdc_getc (void)
	Waits and gets a value on CDC line. More...
iram_size_t	udi_cdc_read_buf (void *buf, iram_size_t size)
	Reads a RAM buffer on CDC line. More...
iram_size_t	udi_cdc_multi_read_no_polling (uint8_t port, void *buf, iram_size_t size)
	Non polling reads of a up to 'size' data from CDC line. More...
iram_size_t	udi_cdc_read_no_polling (void *buf, iram_size_t size)
	Non polling reads of a up to 'size' data from CDC line. More...
iram_size_t	udi_cdc_get_free_tx_buffer (void)
	Gets the number of free byte in TX buffer. More...
bool	udi_cdc_is_tx_ready (void)
	This function checks if a new character sent is possible The type int is used to support scanf redirection from compiler LIB. More...
int	udi_cdc_putc (int value)
	Puts a byte on CDC line The type int is used to support printf redirection from compiler LIB. More...
iram_size_t	udi_cdc_write_buf (const void *buf, iram_size_t size)
	Writes a RAM buffer on CDC line. More...

Interface for application with multi CDC interfaces support
void	udi_cdc_multi_ctrl_signal_dcd (uint8_t port, bool b_set)
	Notify a state change of DCD signal. More...
void	udi_cdc_multi_ctrl_signal_dsr (uint8_t port, bool b_set)
	Notify a state change of DSR signal. More...
void	udi_cdc_multi_signal_framing_error (uint8_t port)
	Notify a framing error. More...
void	udi_cdc_multi_signal_parity_error (uint8_t port)
	Notify a parity error. More...
void	udi_cdc_multi_signal_overrun (uint8_t port)
	Notify a overrun. More...
iram_size_t	udi_cdc_multi_get_nb_received_data (uint8_t port)
	Gets the number of byte received. More...
bool	udi_cdc_multi_is_rx_ready (uint8_t port)
	This function checks if a character has been received on the CDC line. More...
int	udi_cdc_multi_getc (uint8_t port)
	Waits and gets a value on CDC line. More...
iram_size_t	udi_cdc_multi_read_buf (uint8_t port, void *buf, iram_size_t size)
	Reads a RAM buffer on CDC line. More...
iram_size_t	udi_cdc_multi_get_free_tx_buffer (uint8_t port)
	Gets the number of free byte in TX buffer. More...
bool	udi_cdc_multi_is_tx_ready (uint8_t port)
	This function checks if a new character sent is possible The type int is used to support scanf redirection from compiler LIB. More...
int	udi_cdc_multi_putc (uint8_t port, int value)
	Puts a byte on CDC line The type int is used to support printf redirection from compiler LIB. More...
iram_size_t	udi_cdc_multi_write_buf (uint8_t port, const void *buf, iram_size_t size)
	Writes a RAM buffer on CDC line. More...

void udi_cdc_ctrl_signal_dcd

(

bool

b_set

)

Notify a state change of DCD signal.

Parameters

b_set

DCD is enabled if true, else disabled

References CDC_SERIAL_STATE_DCD, and udi_cdc_ctrl_state_change().

void udi_cdc_ctrl_signal_dsr

(

bool

b_set

)

Notify a state change of DSR signal.

Parameters

b_set

DSR is enabled if true, else disabled

References CDC_SERIAL_STATE_DSR, and udi_cdc_ctrl_state_change().

iram_size_t udi_cdc_get_free_tx_buffer

(

void

)

Gets the number of free byte in TX buffer.

Returns

the number of free byte in TX buffer

References udi_cdc_multi_get_free_tx_buffer().

iram_size_t udi_cdc_get_nb_received_data

(

void

)

Gets the number of byte received.

Returns

the number of data available

References udi_cdc_multi_get_nb_received_data().

int udi_cdc_getc

(

void

)

Waits and gets a value on CDC line.

Returns

value read on CDC line

References udi_cdc_multi_getc().

Referenced by stdio_usb_getchar(), uart_rx_notify(), and usart_tx_callback().

bool udi_cdc_is_rx_ready

(

void

)

This function checks if a character has been received on the CDC line.

Returns

1 if a byte is ready to be read.

References udi_cdc_multi_is_rx_ready().

Referenced by usart_tx_callback().

bool udi_cdc_is_tx_ready

(

void

)

This function checks if a new character sent is possible The type int is used to support scanf redirection from compiler LIB.

Returns

1 if a new character can be sent

References udi_cdc_multi_is_tx_ready().

Referenced by usart_rx_callback().

void udi_cdc_multi_ctrl_signal_dcd	(	uint8_t	port,
		bool	b_set
	)

Notify a state change of DCD signal.

Parameters

port	Communication port number to manage
b_set	DCD is enabled if true, else disabled

References CDC_SERIAL_STATE_DCD, and udi_cdc_ctrl_state_change().

void udi_cdc_multi_ctrl_signal_dsr	(	uint8_t	port,
		bool	b_set
	)

Notify a state change of DSR signal.

Parameters

port	Communication port number to manage
b_set	DSR is enabled if true, else disabled

References CDC_SERIAL_STATE_DSR, and udi_cdc_ctrl_state_change().

iram_size_t udi_cdc_multi_get_free_tx_buffer

(

uint8_t

port

)

Gets the number of free byte in TX buffer.

Parameters

port	Communication port number to manage

Returns

the number of free byte in TX buffer

References cpu_irq_restore(), cpu_irq_save(), udi_cdc_tx_both_buf_to_send, udi_cdc_tx_buf_nb, udi_cdc_tx_buf_sel, UDI_CDC_TX_BUFFERS, and udi_cdc_tx_trans_ongoing.

Referenced by udi_cdc_get_free_tx_buffer(), and udi_cdc_multi_is_tx_ready().

iram_size_t udi_cdc_multi_get_nb_received_data

(

uint8_t

port

)

Gets the number of byte received.

Parameters

port	Communication port number to manage

Returns

the number of data available

References cpu_irq_restore(), cpu_irq_save(), udi_cdc_rx_buf_nb, udi_cdc_rx_buf_sel, and udi_cdc_rx_pos.

Referenced by udi_cdc_get_nb_received_data(), and udi_cdc_multi_is_rx_ready().

int udi_cdc_multi_getc

(

uint8_t

port

)

Waits and gets a value on CDC line.

Parameters

port	Communication port number to manage

Returns

value read on CDC line

References usb_cdc_line_coding_t::bDataBits, cpu_irq_restore(), cpu_irq_save(), rx_data, udi_cdc_data_running, udi_cdc_rx_buf, udi_cdc_rx_buf_nb, udi_cdc_rx_buf_sel, udi_cdc_rx_pos, and udi_cdc_rx_start().

Referenced by udi_cdc_getc().

bool udi_cdc_multi_is_rx_ready

(

uint8_t

port

)

This function checks if a character has been received on the CDC line.

Parameters

port	Communication port number to manage

Returns

1 if a byte is ready to be read.

References udi_cdc_multi_get_nb_received_data().

Referenced by udi_cdc_is_rx_ready(), and udi_cdc_rx_start().

bool udi_cdc_multi_is_tx_ready

(

uint8_t

port

)

This function checks if a new character sent is possible The type int is used to support scanf redirection from compiler LIB.

Parameters

port	Communication port number to manage

Returns

1 if a new character can be sent

References udi_cdc_multi_get_free_tx_buffer().

Referenced by udi_cdc_is_tx_ready(), udi_cdc_multi_putc(), and udi_cdc_multi_write_buf().

int udi_cdc_multi_putc	(	uint8_t	port,
		int	value
	)

Puts a byte on CDC line The type int is used to support printf redirection from compiler LIB.

Parameters

port	Communication port number to manage
value	Value to put

Returns

1 if function was successfully done, otherwise 0.

References usb_cdc_line_coding_t::bDataBits, cpu_irq_restore(), cpu_irq_save(), udi_cdc_data_running, udi_cdc_multi_is_tx_ready(), udi_cdc_tx_buf, udi_cdc_tx_buf_nb, and udi_cdc_tx_buf_sel.

Referenced by udi_cdc_putc().

iram_size_t udi_cdc_multi_read_buf	(	uint8_t	port,
		void *	buf,
		iram_size_t	size
	)

Reads a RAM buffer on CDC line.

Parameters

port	Communication port number to manage
buf	Values read
size	Number of values read

Returns

the number of data remaining

References cpu_irq_restore(), cpu_irq_save(), udi_cdc_data_running, udi_cdc_rx_buf, udi_cdc_rx_buf_nb, udi_cdc_rx_buf_sel, udi_cdc_rx_pos, and udi_cdc_rx_start().

Referenced by udi_cdc_read_buf().

iram_size_t udi_cdc_multi_read_no_polling	(	uint8_t	port,
		void *	buf,
		iram_size_t	size
	)

Non polling reads of a up to 'size' data from CDC line.

Parameters

port	Communication port number to manage
buf	Buffer where to store read data
size	Maximum number of data to read (size of buffer)

Returns

the number of data effectively read

References cpu_irq_restore(), cpu_irq_save(), udi_cdc_data_running, udi_cdc_rx_buf, udi_cdc_rx_buf_nb, udi_cdc_rx_buf_sel, udi_cdc_rx_pos, and udi_cdc_rx_start().

Referenced by udi_cdc_read_no_polling().

void udi_cdc_multi_signal_framing_error

(

uint8_t

port

)

Notify a framing error.

Parameters

port	Communication port number to manage

References CDC_SERIAL_STATE_FRAMING, and udi_cdc_ctrl_state_change().

void udi_cdc_multi_signal_overrun

(

uint8_t

port

)

Notify a overrun.

Parameters

port	Communication port number to manage

References CDC_SERIAL_STATE_OVERRUN, and udi_cdc_ctrl_state_change().

void udi_cdc_multi_signal_parity_error

(

uint8_t

port

)

Notify a parity error.

Parameters

port	Communication port number to manage

References CDC_SERIAL_STATE_PARITY, and udi_cdc_ctrl_state_change().

iram_size_t udi_cdc_multi_write_buf	(	uint8_t	port,
		const void *	buf,
		iram_size_t	size
	)

Writes a RAM buffer on CDC line.

Parameters

port	Communication port number to manage
buf	Values to write
size	Number of value to write

Returns

the number of data remaining

References cpu_irq_restore(), cpu_irq_save(), udi_cdc_data_running, udi_cdc_multi_is_tx_ready(), udi_cdc_tx_buf, udi_cdc_tx_buf_nb, udi_cdc_tx_buf_sel, and UDI_CDC_TX_BUFFERS.

Referenced by udi_cdc_write_buf().

int udi_cdc_putc

(

int

value

)

Puts a byte on CDC line The type int is used to support printf redirection from compiler LIB.

Parameters

value

Value to put

Returns

1 if function was successfully done, otherwise 0.

References udi_cdc_multi_putc().

Referenced by stdio_usb_putchar(), and usart_rx_callback().

iram_size_t udi_cdc_read_buf	(	void *	buf,
		iram_size_t	size
	)

Reads a RAM buffer on CDC line.

Parameters

buf	Values read
size	Number of value read

Returns

the number of data remaining

References udi_cdc_multi_read_buf().

iram_size_t udi_cdc_read_no_polling	(	void *	buf,
		iram_size_t	size
	)

Non polling reads of a up to 'size' data from CDC line.

Parameters

buf	Buffer where to store read data
size	Maximum number of data to read (size of buffer)

Returns

the number of data effectively read

References udi_cdc_multi_read_no_polling().

void udi_cdc_signal_framing_error

(

void

)

Notify a framing error.

References CDC_SERIAL_STATE_FRAMING, and udi_cdc_ctrl_state_change().

void udi_cdc_signal_overrun

(

void

)

Notify a overrun.

References CDC_SERIAL_STATE_OVERRUN, and udi_cdc_ctrl_state_change().

Referenced by usart_rx_callback().

void udi_cdc_signal_parity_error

(

void

)

Notify a parity error.

References CDC_SERIAL_STATE_PARITY, and udi_cdc_ctrl_state_change().

iram_size_t udi_cdc_write_buf	(	const void *	buf,
		iram_size_t	size
	)

Writes a RAM buffer on CDC line.

Parameters

buf	Values to write
size	Number of value to write

Returns

the number of data remaining

References udi_cdc_multi_write_buf().