AHDLC Driver. More...

Collaboration diagram for AHDLC:

Defines
#define	IN_ACC_MAP(c, m) (( ((uint8_t) (c)) < 0x20) && ((m) & (1UL << (c))) != 0)
#define	NUT_THREAD_AHDLCRXSTACK 2048
Functions
int	AhdlcOutput (NUTDEVICE dev, NETBUF nb)
	Send HDLC frame.
int	AhdlcAt91IOCtl (NUTDEVICE dev, int req, void conf)
	Perform on-chip UART control functions.
int	AhdlcAt91Init (NUTDEVICE *dev)
	Initialize asynchronous HDLC device.
int	AhdlcAt91Read (NUTFILE fp, void buffer, int size)
	Read from the asynchronous HDLC device.
int	AhdlcAt91Put (NUTDEVICE dev, const void buffer, int len, int pflg)
	Write to the asynchronous HDLC device.
int	AhdlcAt91Write (NUTFILE fp, const void buffer, int len)
	Write to the asynchronous HDLC device.
int	AhdlcAt91Write_P (NUTFILE *fp, PGM_P buffer, int len)
	Write to the asynchronous HDLC device.
NUTFILE *	AhdlcAt91Open (NUTDEVICE dev, const char name, int mode, int acc)
	Open the asynchronous HDLC device.
int	AhdlcAt91Close (NUTFILE *fp)
	Close the asynchronous HDLC device.
Variables
NUTDEVICE	devAhdlc1
	Device information structure.
NUTDEVICE	devAhdlc0
	Device information structure.
NUTDEVICE	devAhdlc1
	Device information structure.
UART1 RTS Handshake Control
UART1_RTS_BIT must be defined in arch/avr.h
void	AhdlcRx (void *arg)
	Asynchronous HDLC receiver thread.
int	AhdlcAvrIOCtl (NUTDEVICE dev, int req, void conf)
	Perform on-chip UART control functions.
int	AhdlcAvrInit (NUTDEVICE *dev)
	Initialize asynchronous HDLC device.
int	AhdlcAvrRead (NUTFILE fp, void buffer, int size)
	Read from the asynchronous HDLC device.
int	AhdlcAvrPut (NUTDEVICE dev, const void buffer, int len, int pflg)
	Write to the asynchronous HDLC device.
int	AhdlcAvrWrite (NUTFILE fp, const void buffer, int len)
	Write to the asynchronous HDLC device.
int	AhdlcAvrWrite_P (NUTFILE *fp, PGM_P buffer, int len)
	Write to the asynchronous HDLC device.
NUTFILE *	AhdlcAvrOpen (NUTDEVICE dev, const char name, int mode, int acc)
	Open the asynchronous HDLC device.
int	AhdlcAvrClose (NUTFILE *fp)
	Close the asynchronous HDLC device.
#define	IN_ACC_MAP(c, m) in_acc_map(c, &(m))
#define	NUT_THREAD_AHDLCRXSTACK 512

Detailed Description

AHDLC Driver.

This code contains a modified UART driver with some speed optimizations for PPP, like table driven FCS calculation. It also implements simple modem handshaking (RTS, CTS and DTR).

Define Documentation

#define IN_ACC_MAP	(	c,
		m
	)	(( ((uint8_t) (c)) < 0x20) && ((m) & (1UL << (c))) != 0)

Checks the 32-bit ACCM to see if the byte needs un-escaping

#define NUT_THREAD_AHDLCRXSTACK 2048

Referenced by AhdlcAt91Init().

#define IN_ACC_MAP	(	c,
		m
	)	in_acc_map(c, &(m))

Checks the 32-bit ACCM to see if the byte needs un-escaping

#define NUT_THREAD_AHDLCRXSTACK 512

Referenced by AhdlcAvrInit().

Function Documentation

int AhdlcOutput	(	NUTDEVICE *	dev,
		NETBUF *	nb
	)

Send HDLC frame.

Parameters:

dev	Identifies the device to use.
nb	Network buffer structure containing the packet to be sent. The structure must have been allocated by a previous call NutNetBufAlloc().

Returns:: 0 on success, -1 in case of any errors.

References AHDLC_FLAG, AHDLC_INITFCS, _AHDLCDCB::dcb_modeflags, _AHDLCDCB::dcb_tx_mru, _NUTDEVICE::dev_dcb, _NETBUF::nb_ap, _NETBUF::nb_dl, _NETBUF::nb_nw, _NETBUF::nb_tp, _NBDATA::sz, UART_MF_RAWMODE, and _NBDATA::vp.

Referenced by AhdlcRx().

void AhdlcRx ( void * arg )

Asynchronous HDLC receiver thread.

Running at high priority.

References AHDLC_ESCAPE, AHDLC_FLAG, AHDLC_GOODFCS, AHDLC_INITFCS, AHDLC_TRANS, AhdlcOutput(), _AHDLCDCB::dcb_mf_evt, _AHDLCDCB::dcb_modeflags, _AHDLCDCB::dcb_rd_idx, _AHDLCDCB::dcb_rtimeout, _AHDLCDCB::dcb_rx_buf, _AHDLCDCB::dcb_rx_idx, _AHDLCDCB::dcb_rx_mru, _AHDLCDCB::dcb_rx_rdy, _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, _NUTDEVICE::dev_ioctl, ifnet::if_recv, ifnet::if_send, LCP_LOWERDOWN, LCP_LOWERUP, memcpy(), _NETBUF::nb_dl, NBAF_DATALINK, NutEventWait(), NutHeapAlloc, NutHeapFree, NutNetBufAlloc(), NutSleep(), NutThreadSetPriority(), PRG_RDB, UART_MF_RAWMODE, and _NBDATA::vp.

Referenced by AhdlcAt91Init(), and AhdlcAvrInit().

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int AhdlcAt91IOCtl	(	NUTDEVICE *	dev,
		int	req,
		void *	conf
	)

Perform on-chip UART control functions.

Parameters:

dev	Identifies the device that receives the device-control function.
req	Requested control function. May be set to one of the following constants: UART_SETSPEED, conf points to an uint32_t value containing the baudrate. UART_GETSPEED, conf points to an uint32_t value receiving the current baudrate. UART_SETSTATUS, conf points to an uint32_t value containing the changes for the control lines. UART_GETSTATUS, conf points to an uint32_t value receiving the state of the control lines and the device. UART_SETREADTIMEOUT, conf points to an uint32_t value containing the read timeout. UART_GETREADTIMEOUT, conf points to an uint32_t value receiving the read timeout. UART_SETWRITETIMEOUT, conf points to an uint32_t value containing the write timeout. UART_GETWRITETIMEOUT, conf points to an uint32_t value receiving the write timeout. UART_SETLOCALECHO, conf points to an uint32_t value containing 0 (off) or 1 (on). UART_GETLOCALECHO, conf points to an uint32_t value receiving 0 (off) or 1 (on). UART_SETFLOWCONTROL, conf points to an uint32_t value containing combined UART_FCTL_ values. UART_GETFLOWCONTROL, conf points to an uint32_t value containing receiving UART_FCTL_ values. UART_SETCOOKEDMODE, conf points to an uint32_t value containing 0 (off) or 1 (on). UART_GETCOOKEDMODE, conf points to an uint32_t value receiving 0 (off) or 1 (on). UART_SETRAWMODE, conf points to an uint32_t value containing 0 (off) or 1 (on). UART_GETRAWMODE, conf points to an uint32_t value receiving 0 (off) or 1 (on). HDLC_SETIFNET, conf points to a pointer containing the address of the network device's NUTDEVICE structure. HDLC_GETIFNET, conf points to a pointer receiving the address of the network device's NUTDEVICE structure.
conf	Points to a buffer that contains any data required for the given control function or receives data from that function.

Returns:: 0 on success, -1 otherwise.

Warning:: Timeout values are given in milliseconds and are limited to the granularity of the system timer.

Note:: For ATmega103, only 8 data bits, 1 stop bit and no parity are allowed.

References _AHDLCDCB::dcb_base, _AHDLCDCB::dcb_mf_evt, _AHDLCDCB::dcb_modeflags, _AHDLCDCB::dcb_rtimeout, _AHDLCDCB::dcb_rx_rdy, _AHDLCDCB::dcb_wtimeout, _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, _NUTDEVICE::dev_type, devUsartAt910, HDLC_GETIFNET, HDLC_SETIFNET, IFTYP_CHAR, IFTYP_NET, inr, NutEventPost(), NutGetCpuClock(), outr, rc, UART_GETFLOWCONTROL, UART_GETLOCALECHO, UART_GETRAWMODE, UART_GETREADTIMEOUT, UART_GETSPEED, UART_GETSTATUS, UART_GETWRITETIMEOUT, UART_MF_LOCALECHO, UART_MF_RAWMODE, UART_SETFLOWCONTROL, UART_SETLOCALECHO, UART_SETRAWMODE, UART_SETREADTIMEOUT, UART_SETSPEED, UART_SETSTATUS, UART_SETWRITETIMEOUT, US_BRGR_OFF, US_CLKS, US_CLKS_MCK, US_CLKS_MCK8, US_MR_OFF, and USART1_BASE.

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int AhdlcAt91Init ( NUTDEVICE * dev )

Initialize asynchronous HDLC device.

This function will be called during device registration. It initializes the hardware, registers all required interrupt handlers and initializes all internal data structures used by this driver.

Parameters:

dev	Identifies the device to initialize.

Returns:: 0 on success, -1 otherwise.

References _BV, AhdlcRx(), _AHDLCDCB::dcb_base, _AHDLCDCB::dcb_rx_buf, _AHDLCDCB::dcb_rx_mru, _AHDLCDCB::dcb_tx_accm, _AHDLCDCB::dcb_tx_buf, _AHDLCDCB::dcb_tx_mru, _NUTDEVICE::dev_base, _NUTDEVICE::dev_dcb, memset(), NUT_AHDLC_RECV_DMA_SIZE, NUT_THREAD_AHDLCRXSTACK, NUT_THREAD_STACK_ADD, NUT_THREAD_STACK_MULT, NutGetCpuClock(), NutHeapAlloc, NutHeapFree, NutRegisterIrqHandler(), NutThreadCreate(), outr, PDC_RXTDIS, PERIPH_PTCR_OFF, PERIPH_RCR_OFF, PERIPH_RNCR_OFF, PERIPH_RNPR_OFF, PERIPH_RPR_OFF, PMC_PCER, rc, SIG_UART, US1_BRGR, US1_CR, US1_ID, US1_IDR, US1_MR, US_CHMODE_NORMAL, US_CHRL_8, US_GPIO_PINS, US_NBSTOP_1, US_PAR_NO, US_RSTRX, US_RSTTX, US_RXDIS, US_TXDIS, and USART1_BASE.

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int AhdlcAt91Read	(	NUTFILE *	fp,
		void *	buffer,
		int	size
	)

Read from the asynchronous HDLC device.

This function is called by the low level input routines of the C runtime library, using the _NUTDEVICE::dev_read entry.

The function may block the calling thread until at least one character has been received or a timeout occurs.

It is recommended to set a proper read timeout with software handshake. In this case a timeout may occur, if the communication peer lost our last XON character. The application may then use ioctl() to disable the receiver and do the read again. This will send out another XON.

Parameters:

fp	Pointer to a _NUTFILE structure, obtained by a previous call to AhdlcOpen().
buffer	Pointer to the buffer that receives the data. If zero, then all characters in the input buffer will be removed.
size	Maximum number of bytes to read.

Returns:: The number of bytes read, which may be less than the number of bytes specified. A return value of -1 indicates an error, while zero is returned in case of a timeout.

References _AHDLCDCB::dcb_rd_idx, _AHDLCDCB::dcb_rtimeout, _AHDLCDCB::dcb_rx_buf, _AHDLCDCB::dcb_rx_idx, _AHDLCDCB::dcb_rx_rdy, _NUTDEVICE::dev_dcb, _NUTFILE::nf_dev, NutEventWait(), and rc.

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int AhdlcAt91Put	(	NUTDEVICE *	dev,
		const void *	buffer,
		int	len,
		int	pflg
	)

Write to the asynchronous HDLC device.

Parameters:

dev	Pointer to a previously registered NUTDEVICE structure.
buffer	Pointer the data to write.
len	Number of data bytes to write.
pflg	If this flag is set, then the buffer is located in program space.

Returns:: The number of bytes written. In case of a write timeout, this may be less than the specified length.

References _NUTDEVICE::dev_dcb, NutEnterCritical, NutExitCritical, outr, PRG_RDB, rc, US1_IER, and US_TXRDY.

Referenced by AhdlcAt91Write(), and AhdlcAt91Write_P().

int AhdlcAt91Write	(	NUTFILE *	fp,
		const void *	buffer,
		int	len
	)

Write to the asynchronous HDLC device.

This function is called by the low level output routines of the C runtime library, using the _NUTDEVICE::dev_write entry.

The function may block the calling thread.

Parameters:

fp	Pointer to a _NUTFILE structure, obtained by a previous call to AhldcOpen().
buffer	Pointer to the data to be written. If zero, then the output buffer will be flushed.
len	Number of bytes to write.

Returns:: The number of bytes written, which may be less than the number of bytes specified if a timeout occured. A return value of -1 indicates an error.

References AhdlcAt91Put(), and _NUTFILE::nf_dev.

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int AhdlcAt91Write_P	(	NUTFILE *	fp,
		PGM_P	buffer,
		int	len
	)

Write to the asynchronous HDLC device.

Similar to AhdlcWrite() except that the data is located in program memory.

This function is called by the low level output routines of the C runtime library, using the _NUTDEVICE::dev_write_P entry.

The function may block the calling thread.

Parameters:

fp	Pointer to a NUTFILE structure, obtained by a previous call to AhdlcOpen().
buffer	Pointer to the data in program space to be written.
len	Number of bytes to write.

Returns:: The number of bytes written, which may be less than the number of bytes specified if a timeout occured. A return value of -1 indicates an error.

References AhdlcAt91Put(), and _NUTFILE::nf_dev.

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NUTFILE* AhdlcAt91Open	(	NUTDEVICE *	dev,
		const char *	name,
		int	mode,
		int	acc
	)

Open the asynchronous HDLC device.

This function is called by the low level open routine of the C runtime library, using the _NUTDEVICE::dev_open entry.

Parameters:

dev	Pointer to the NUTDEVICE structure.
name	Ignored, should point to an empty string.
mode	Operation mode. Any of the following values may be or-ed: _O_BINARY _O_RDONLY _O_WRONLY
acc	Ignored, should be zero.

Returns:: Pointer to a NUTFILE structure if successful or NUTFILE_EOF otherwise.

References _NUTFILE::nf_dev, _NUTFILE::nf_fcb, _NUTFILE::nf_next, NutEnterCritical, NutExitCritical, NUTFILE_EOF, NutHeapAlloc, NutIrqEnable(), outr, PDC_RXTEN, PERIPH_PTCR_OFF, SIG_UART, UART_RECEIVER_TIMEOUT, US1_CR, US1_IER, US1_RTOR, US_ENDRX, US_RXBUFF, US_RXEN, US_STTTO, US_TIMEOUT, US_TXEN, and USART1_BASE.

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int AhdlcAt91Close ( NUTFILE * fp )

Close the asynchronous HDLC device.

This function is called by the low level close routine of the C runtime library, using the _NUTDEVICE::dev_close entry.

Parameters:

fp	Pointer to a _NUTFILE structure, obtained by a previous call to UsartOpen().

Returns:: 0 on success or -1 otherwise.

Todo:: We may support shared open and use dev_irq as an open counter.

References NUTFILE_EOF, and NutHeapFree.

int AhdlcAvrIOCtl	(	NUTDEVICE *	dev,
		int	req,
		void *	conf
	)

Perform on-chip UART control functions.

Parameters:

dev	Identifies the device that receives the device-control function.
req	Requested control function. May be set to one of the following constants: UART_SETSPEED, conf points to an uint32_t value containing the baudrate. UART_GETSPEED, conf points to an uint32_t value receiving the current baudrate. UART_SETDATABITS, conf points to an uint32_t value containing the number of data bits, 5, 6, 7 or 8. UART_GETDATABITS, conf points to an uint32_t value receiving the number of data bits, 5, 6, 7 or 8. UART_SETPARITY, conf points to an uint32_t value containing the parity, 0 (no), 1 (odd) or 2 (even). UART_GETPARITY, conf points to an uint32_t value receiving the parity, 0 (no), 1 (odd) or 2 (even). UART_SETSTOPBITS, conf points to an uint32_t value containing the number of stop bits 1 or 2. UART_GETSTOPBITS, conf points to an uint32_t value receiving the number of stop bits 1 or 2. UART_SETSTATUS, conf points to an uint32_t value containing the changes for the control lines. UART_GETSTATUS, conf points to an uint32_t value receiving the state of the control lines and the device. UART_SETREADTIMEOUT, conf points to an uint32_t value containing the read timeout. UART_GETREADTIMEOUT, conf points to an uint32_t value receiving the read timeout. UART_SETWRITETIMEOUT, conf points to an uint32_t value containing the write timeout. UART_GETWRITETIMEOUT, conf points to an uint32_t value receiving the write timeout. UART_SETLOCALECHO, conf points to an uint32_t value containing 0 (off) or 1 (on). UART_GETLOCALECHO, conf points to an uint32_t value receiving 0 (off) or 1 (on). UART_SETFLOWCONTROL, conf points to an uint32_t value containing combined UART_FCTL_ values. UART_GETFLOWCONTROL, conf points to an uint32_t value containing receiving UART_FCTL_ values. UART_SETCOOKEDMODE, conf points to an uint32_t value containing 0 (off) or 1 (on). UART_GETCOOKEDMODE, conf points to an uint32_t value receiving 0 (off) or 1 (on). UART_SETRAWMODE, conf points to an uint32_t value containing 0 (off) or 1 (on). UART_GETRAWMODE, conf points to an uint32_t value receiving 0 (off) or 1 (on). HDLC_SETIFNET, conf points to a pointer containing the address of the network device's NUTDEVICE structure. HDLC_GETIFNET, conf points to a pointer receiving the address of the network device's NUTDEVICE structure. HDLC_SETTXACCM, conf points to an uint32_t value containing the ACC Map in host endian. HDLC_GETTXACCM, conf points to an uint32_t value receiving the ACC Map in host endian.
conf	Points to a buffer that contains any data required for the given control function or receives data from that function.

Returns:: 0 on success, -1 otherwise.

Warning:: Timeout values are given in milliseconds and are limited to the granularity of the system timer.

Note:: For ATmega103, only 8 data bits, 1 stop bit and no parity are allowed.

References _AHDLCDCB::dcb_mf_evt, _AHDLCDCB::dcb_modeflags, _AHDLCDCB::dcb_rtimeout, _AHDLCDCB::dcb_rx_mru, _AHDLCDCB::dcb_rx_rdy, _AHDLCDCB::dcb_tx_accm, _AHDLCDCB::dcb_tx_mru, _AHDLCDCB::dcb_wtimeout, _NUTDEVICE::dev_base, _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, _NUTDEVICE::dev_type, devUart0, HDLC_GETIFNET, HDLC_GETTXACCM, HDLC_SETIFNET, HDLC_SETTXACCM, IFTYP_CHAR, IFTYP_NET, inb, NutEventPost(), NutGetCpuClock(), outb, rc, UART_GETDATABITS, UART_GETFLOWCONTROL, UART_GETLOCALECHO, UART_GETPARITY, UART_GETRAWMODE, UART_GETREADTIMEOUT, UART_GETSPEED, UART_GETSTATUS, UART_GETSTOPBITS, UART_GETWRITETIMEOUT, UART_MF_LOCALECHO, UART_MF_RAWMODE, UART_SETDATABITS, UART_SETFLOWCONTROL, UART_SETLOCALECHO, UART_SETPARITY, UART_SETRAWMODE, UART_SETREADTIMEOUT, UART_SETSPEED, UART_SETSTATUS, UART_SETSTOPBITS, UART_SETWRITETIMEOUT, and UBRR.

Referenced by AhdlcAvrInit().

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int AhdlcAvrInit ( NUTDEVICE * dev )

Initialize asynchronous HDLC device.

This function will be called during device registration. It initializes the hardware, registers all required interrupt handlers and initializes all internal data structures used by this driver.

Parameters:

dev	Identifies the device to initialize.

Returns:: 0 on success, -1 otherwise.

References AhdlcAvrIOCtl(), AhdlcRx(), cbi, _AHDLCDCB::dcb_base, _AHDLCDCB::dcb_rx_buf, _AHDLCDCB::dcb_rx_mru, _AHDLCDCB::dcb_tx_accm, _AHDLCDCB::dcb_tx_buf, _AHDLCDCB::dcb_tx_mru, _NUTDEVICE::dev_base, _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, EICR, memset(), NUT_THREAD_AHDLCRXSTACK, NUT_THREAD_STACK_ADD, NUT_THREAD_STACK_MULT, NutHeapAlloc, NutHeapFree, NutRegisterIrqHandler(), NutThreadCreate(), rc, sbi, sig_UART0_DATA, sig_UART0_RECV, sig_UART1_DATA, sig_UART1_RECV, and UART_SETSPEED.

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int AhdlcAvrRead	(	NUTFILE *	fp,
		void *	buffer,
		int	size
	)

Read from the asynchronous HDLC device.

This function is called by the low level input routines of the C runtime library, using the _NUTDEVICE::dev_read entry.

The function may block the calling thread until at least one character has been received or a timeout occurs.

It is recommended to set a proper read timeout with software handshake. In this case a timeout may occur, if the communication peer lost our last XON character. The application may then use ioctl() to disable the receiver and do the read again. This will send out another XON.

Parameters:

fp	Pointer to a _NUTFILE structure, obtained by a previous call to AhdlcOpen().
buffer	Pointer to the buffer that receives the data. If zero, then all characters in the input buffer will be removed.
size	Maximum number of bytes to read.

Returns:: The number of bytes read, which may be less than the number of bytes specified. A return value of -1 indicates an error, while zero is returned in case of a timeout.

References _AHDLCDCB::dcb_rd_idx, _AHDLCDCB::dcb_rtimeout, _AHDLCDCB::dcb_rx_buf, _AHDLCDCB::dcb_rx_idx, _AHDLCDCB::dcb_rx_rdy, _NUTDEVICE::dev_dcb, _NUTFILE::nf_dev, NutEventWait(), and rc.

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int AhdlcAvrPut	(	NUTDEVICE *	dev,
		const void *	buffer,
		int	len,
		int	pflg
	)

Write to the asynchronous HDLC device.

Parameters:

dev	Pointer to a previously registered NUTDEVICE structure.
buffer	Pointer the data to write.
len	Number of data bytes to write.
pflg	If this flag is set, then the buffer is located in program space.

Returns:: The number of bytes written. In case of a write timeout, this may be less than the specified length.

References _NUTDEVICE::dev_base, _NUTDEVICE::dev_dcb, PRG_RDB, rc, sbi, UCR, and UDRIE.

Referenced by AhdlcAvrWrite(), and AhdlcAvrWrite_P().

int AhdlcAvrWrite	(	NUTFILE *	fp,
		const void *	buffer,
		int	len
	)

Write to the asynchronous HDLC device.

This function is called by the low level output routines of the C runtime library, using the _NUTDEVICE::dev_write entry.

The function may block the calling thread.

Parameters:

fp	Pointer to a _NUTFILE structure, obtained by a previous call to AhldcOpen().
buffer	Pointer to the data to be written. If zero, then the output buffer will be flushed.
len	Number of bytes to write.

Returns:: The number of bytes written, which may be less than the number of bytes specified if a timeout occured. A return value of -1 indicates an error.

References AhdlcAvrPut(), and _NUTFILE::nf_dev.

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int AhdlcAvrWrite_P	(	NUTFILE *	fp,
		PGM_P	buffer,
		int	len
	)

Write to the asynchronous HDLC device.

Similar to AhdlcWrite() except that the data is located in program memory.

This function is called by the low level output routines of the C runtime library, using the _NUTDEVICE::dev_write_P entry.

The function may block the calling thread.

Parameters:

fp	Pointer to a NUTFILE structure, obtained by a previous call to AhdlcOpen().
buffer	Pointer to the data in program space to be written.
len	Number of bytes to write.

Returns:: The number of bytes written, which may be less than the number of bytes specified if a timeout occured. A return value of -1 indicates an error.

References AhdlcAvrPut(), and _NUTFILE::nf_dev.

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NUTFILE* AhdlcAvrOpen	(	NUTDEVICE *	dev,
		const char *	name,
		int	mode,
		int	acc
	)

Open the asynchronous HDLC device.

This function is called by the low level open routine of the C runtime library, using the _NUTDEVICE::dev_open entry.

Parameters:

dev	Pointer to the NUTDEVICE structure.
name	Ignored, should point to an empty string.
mode	Operation mode. Any of the following values may be or-ed: _O_BINARY _O_RDONLY _O_WRONLY
acc	Ignored, should be zero.

Returns:: Pointer to a NUTFILE structure if successful or NUTFILE_EOF otherwise.

References cbi, _NUTDEVICE::dev_base, _NUTFILE::nf_dev, _NUTFILE::nf_fcb, _NUTFILE::nf_next, NUTFILE_EOF, and NutHeapAlloc.

int AhdlcAvrClose ( NUTFILE * fp )

Close the asynchronous HDLC device.

This function is called by the low level close routine of the C runtime library, using the _NUTDEVICE::dev_close entry.

Parameters:

fp	Pointer to a _NUTFILE structure, obtained by a previous call to UsartOpen().

Returns:: 0 on success or -1 otherwise.

Todo:: We may support shared open and use dev_irq as an open counter.

References _NUTDEVICE::dev_base, _NUTFILE::nf_dev, NUTFILE_EOF, NutHeapFree, and sbi.

Variable Documentation

NUTDEVICE devAhdlc1

Initial value:

 {
    0,                          
    {'u', 'a', 'r', 't', '1', 0, 0, 0, 0},      
    IFTYP_CHAR,                 
    1,                          
    0,                          
    0,                          
    &dcb_ahdlc,                 
    AhdlcAt91Init,              
    AhdlcAt91IOCtl,             
    AhdlcAt91Read,              
    AhdlcAt91Write,             
    AhdlcAt91Open,              
    AhdlcAt91Close,             
    0                           
}

Device information structure.

A pointer to this structure must be passed to NutRegisterDevice() to bind this device driver to the Nut/OS kernel.

NUTDEVICE devAhdlc0

Initial value:

 {
    0,                          
    {'u', 'a', 'r', 't', '0', 0, 0, 0, 0},      
    IFTYP_CHAR,                 
    0,                          
    0,                          
    0,                          
    &dcb_ahdlc,                 
    AhdlcAvrInit,               
    AhdlcAvrIOCtl,              
    AhdlcAvrRead,               
    AhdlcAvrWrite,              
    AhdlcAvrWrite_P,            
    AhdlcAvrOpen,               
    AhdlcAvrClose,              
    0                           
}

Device information structure.

A pointer to this structure must be passed to NutRegisterDevice() to bind this device driver to the Nut/OS kernel.

NUTDEVICE devAhdlc1

Initial value:

 {
    0,                          
    {'u', 'a', 'r', 't', '1', 0, 0, 0, 0},      
    IFTYP_CHAR,                 
    1,                          
    0,                          
    0,                          
    &dcb_ahdlc,                 
    AhdlcAvrInit,               
    AhdlcAvrIOCtl,              
    AhdlcAvrRead,               
    AhdlcAvrWrite,              
    AhdlcAvrWrite_P,            
    AhdlcAvrOpen,               
    AhdlcAvrClose,              
    0                           
}

Device information structure.

A pointer to this structure must be passed to NutRegisterDevice() to bind this device driver to the Nut/OS kernel.

Defines

Functions

Variables

UART1 RTS Handshake Control

Detailed Description

Define Documentation

Function Documentation

Variable Documentation