Calibre UK ICA93LV user manual Sendaddress, Sendstop, Restart

	Setnack 1 for no acknowledge 0 for acknowledge.
Parameters returned	I2Cdata, the data read, if a time-out occurs the ErrCode 8005H is
	returned.
Prerequisites	Adapter must be configured using setup, start and read address sent by
	sendaddress.
Functional Description	If setnack is 1 the function writes 40H to the control register to establish
	the correct acknowledge procedure. The data is read from the adapter.
	IMPORTANT: SETNACK MUST = 1 WHEN READING THE LAST AND
	THE LAST BUT ONE BYTES IN A SEQUENCE OF BYTES
	SETNACK MUST = 0 FOR ALL OTHER READS. IF THIS FORMAT IS
	NOT STRICTLY FOLLOWED THEN THE ADAPTER AND BUS WILL
	NOT OPERATE CORRECTLY.
	WHEN READING ANOTHER I2C DEVICE THE FIRST BYTE READ
	USING THE READBYTE FUNCTION IS ALWAYS THE SLAVE
	ADDRESS OF THAT DEVICE. THIS MUST BE READ AND
	DISCARDED BEFORE THE REAL DATA CAN BE READ. DO NOT
	COUNT THIS EXTRA READ WHEN CONSIDERING WHETHER OR
	NOT TO ACKNOWLEDGE.
	Should a time-out occur then an error code 8005H is returned, otherwise
	the data is returned. Readbyte is compatible with both master read and
	slave read modes.
sendstop
Function specification	Int sendstop ( )
Parameters returned	ErrCode. If the transfer time out occurs error code 8002H is returned
	otherwise the status is returned.
Prerequisites	Adapter must be configured using setup. Should normally only be used
	at the end of transmission. Correct acknowledge sequence must have
	been applied if the transmission was a read.
Functional description	Instruct the adapter to send a stop code and wait for it to be sent. Should
	a time-out occur during the sending of a stop then an error code 8002H
	is returned, otherwise the status is returned.
restart
Function specification	Int restart (int slaveaddress, int setnack)
	Slaveaddress is the address to be accessed via the I2C, e.g. A1H
	Setnack 1 for no acknowledge 0 for acknowledge – see Functional
	Description.
Parameters returned	ErrCode. If the transfer time out occurs error code 8003H is returned
	otherwise the status is returned.
Prerequisites	Adapter must be configures using setup. A start and slave address must
	have previously been sent using sendaddress. Usually a data pointer
	would already have been written using writebyte.
Functional description	Sends a start code and the slave address specified and presets the
	acknowledge status depending on the value of setnack. The
	acknowledge is set ready for the data transfer after the address and
	hence in read mode (odd address being sent) if only one byte is to be
	read the setnack parameter must equal 1. If more than one byte is to be
	read or if in write mode (even address being sent) then setnack must
	equal 0.
	The function waits for the address to be sent. Should a time-out occur
	during the sending of an address then an error code 8003H is returned,
	otherwise the status is returned.
Revision 1.7	Page 17 of 27
09/12/1999