Calibre UK PICA93LV user manual Sendaddress, Int I2CData

CALIBRE

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Parameters returned		int ErrCode.
		If the transfer time out occurs error code 8004H is returned otherwise the
		status is returned.
Prerequisites		Adapter must be configured using setup, start and write address sent by
		sendaddress.
Functional description		The function writes the data to the adapter and then waits for it to be sent.
		Should a time-out occur during the sending of the data then error code 8004H
		is returned, otherwise the status is returned.
		Writebyte is compatible with both master write and slave write modes.
4.4.7.	readbyte
Function specification		Int readbyte(int setnack)
Parameters are:		int setnack
		This controls whether the Parallel I2C Communications Adapter transmits an
		Acknowledge down the I2C Bus on reception of a byte. The last byte received
		during a transfer must not be acknowledged, in all other cases acknowledge
		must be enabled. If setnack = 0 then acknowledge is enabled, if setnack = 1
		then acknowledge is disabled. Therefore, if a read (odd numbered) address is
		being sent AND only 1 Byte is to be read, setnack should be set to = 1; in all
		other cases it must be clear = 0.
Parameters returned		int 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.
		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.
4.4.8.	sendstop
Function specification		Int sendstop( )
Parameters are:		None.
Parameters returned		int 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 a 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.

Issue 1.3 Page 22

22/07/99