#include <wg_eeprom.h>

Public Member Functions
bool	readEepromPage (EthercatCom com, WGMailbox mbx, unsigned page, void *data, unsigned length)
	Read data from single eeprom page. More...

	WGEeprom ()

bool	writeEepromPage (EthercatCom com, WGMailbox mbx, unsigned page, const void *data, unsigned length)
	Write data to single eeprom page. More...

Protected Member Functions
bool	readEepromStatusReg (EthercatCom com, WGMailbox mbx, EepromStatusReg &reg)
	Reads EEPROM status register. More...

bool	readSpiEepromCmd (EthercatCom com, WGMailbox mbx, WG0XSpiEepromCmd &cmd)
	Reads SPI state machine command register. More...

bool	sendSpiEepromCmd (EthercatCom com, WGMailbox mbx, const WG0XSpiEepromCmd &cmd)
	Sends command to SPI EEPROM state machine. More...

bool	waitForEepromReady (EthercatCom com, WGMailbox mbx)
	Waits for EEPROM to become ready. More...

bool	waitForSpiEepromReady (EthercatCom com, WGMailbox mbx)
	Waits for SPI eeprom state machine to be idle. More...

Protected Attributes
boost::mutex	mutex_
	Only one eeprom transaction can occur at a time. More...

Static Protected Attributes
static const unsigned	MAX_EEPROM_PAGE_SIZE = 264

static const unsigned	NUM_EEPROM_PAGES = 4096

Detailed Description

Definition at line 48 of file wg_eeprom.h.

Constructor & Destructor Documentation

ethercat_hardware::WGEeprom::WGEeprom ( )

Definition at line 107 of file wg_eeprom.cpp.

Member Function Documentation

bool ethercat_hardware::WGEeprom::readEepromPage	(	EthercatCom *	com,
		WGMailbox *	mbx,
		unsigned	page,
		void *	data,
		unsigned	length
	)

Read data from single eeprom page.

Data should be less than 264 bytes. Note that some eeproms only support 256 byte pages. If 264 bytes of data are read from a 256 byte eeprom, then last 8 bytes of data will be zeros. Function may block for extended periods of time (is not realtime safe).

Parameters

com	EtherCAT communication class used for communicating with device
mbx	Mailbox for used communication with device
page	EEPROM page number to read from. Should be 0 to 4095.
data	pointer to data buffer
length	length of data in buffer

Returns: true if there is success, false if there is an error

Definition at line 223 of file wg_eeprom.cpp.

bool ethercat_hardware::WGEeprom::readEepromStatusReg	(	EthercatCom *	com,
		WGMailbox *	mbx,
		EepromStatusReg &	reg
	)

protected

Reads EEPROM status register.

Amoung other things, eeprom status register provide information about whether eeprom is busy performing a write.

Parameters

com	EtherCAT communication class used for communicating with device
reg	reference to EepromStatusReg struct where eeprom status will be stored

Returns: true if there is success, false if there is an error

Definition at line 401 of file wg_eeprom.cpp.

bool ethercat_hardware::WGEeprom::readSpiEepromCmd	(	EthercatCom *	com,
		WGMailbox *	mbx,
		WG0XSpiEepromCmd &	cmd
	)

protected

Reads SPI state machine command register.

For communicating with EEPROM, there is a simple state machine that transfers data to/from FPGA buffer over SPI. When any type of comunication is done with EEPROM:

Write command or write data into FPGA buffer.
Have state machine start transfer bytes from buffer to EEPROM, and write data from EEPROM into buffer
Wait for state machine to complete (by reading its status)
Read EEPROM response from FPGA buffer.

Parameters

com	EtherCAT communication class used for communicating with device
reg	reference to WG0XSpiEepromCmd struct where read data will be stored

Returns: true if there is success, false if there is an error

Definition at line 456 of file wg_eeprom.cpp.

bool ethercat_hardware::WGEeprom::sendSpiEepromCmd	(	EthercatCom *	com,
		WGMailbox *	mbx,
		const WG0XSpiEepromCmd &	cmd
	)

protected

Sends command to SPI EEPROM state machine.

This function makes sure SPI EEPROM state machine is idle before sending new command. It also waits for state machine to be idle before returning.

Parameters

com	EtherCAT communication class used for communicating with device

Returns: true if command was send, false if there is an error

Definition at line 158 of file wg_eeprom.cpp.

bool ethercat_hardware::WGEeprom::waitForEepromReady	(	EthercatCom *	com,
		WGMailbox *	mbx
	)

protected

Waits for EEPROM to become ready.

Certain eeprom operations (such as page reads), are complete immediately after data is trasferred. Other operations (such as page writes) take some amount of time after data is trasfered to complete. This polls the EEPROM status register until the 'ready' bit is set.

Parameters

com	EtherCAT communication class used for communicating with device

Returns: true if there is success, false if there is an error or wait takes too long

Definition at line 359 of file wg_eeprom.cpp.

bool ethercat_hardware::WGEeprom::waitForSpiEepromReady	(	EthercatCom *	com,
		WGMailbox *	mbx
	)

protected

Waits for SPI eeprom state machine to be idle.

Polls busy SPI bit of SPI state machine.

Parameters

com	EtherCAT communication class used for communicating with device

Returns: true if state machine is free, false if there is an error, or we timed out waiting

Definition at line 121 of file wg_eeprom.cpp.

bool ethercat_hardware::WGEeprom::writeEepromPage	(	EthercatCom *	com,
		WGMailbox *	mbx,
		unsigned	page,
		const void *	data,
		unsigned	length
	)

Write data to single eeprom page.

Data should be less than 264 bytes. If data size is less than 264 bytes, then the page will be padded with 0xFF. Note that some eeproms only support 256 byte pages. With 256 byte eeproms, the eeprom FW with ingore last 8 bytes of requested write. Function may block for extended periods of time (is not realtime safe).

Parameters

com	EtherCAT communication class used for communicating with device
page	EEPROM page number to write to. Should be 0 to 4095.
data	pointer to data buffer
length	length of data in buffer. If length < 264, eeprom page will be padded out to 264 bytes.

Returns: true if there is success, false if there is an error

Definition at line 289 of file wg_eeprom.cpp.

Member Data Documentation

const unsigned ethercat_hardware::WGEeprom::MAX_EEPROM_PAGE_SIZE = 264

staticprotected

Definition at line 57 of file wg_eeprom.h.

boost::mutex ethercat_hardware::WGEeprom::mutex_

protected

Only one eeprom transaction can occur at a time.

Definition at line 69 of file wg_eeprom.h.

const unsigned ethercat_hardware::WGEeprom::NUM_EEPROM_PAGES = 4096

staticprotected

Definition at line 56 of file wg_eeprom.h.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Member Functions

Protected Attributes

Static Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation