In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Alessandro wrote:

This is my MAIN (the rest of VP in not changed appart for the slaveid and the isr_period)

I need to Send the byte in this order (1° slaveid, address of memory, $03, and then i need to read the result of a distance misure by Lego Ultrasonic Sensor.

Can anybody help? or send me the routin in SXB?



main		_bank	I2CM
		mov	I2CM_address,#slave_adr		; set address of slave to read. 
		_bank	VARS				; clear read and write pointers
		clr	read_adr			
		clr	write_ptr
		mov	read_adr,#$42

I2C_read	
                                _bank	VARS
		mov	w,read_adr
		_bank	I2CM
 		mov	I2CM_data_0,w			; load send register with data address		
		call	@I2CM_wait_not_busy		; wait for I2CM state machine to enter idle state
		call	@I2CM_send_byte			; send 'want to read' and bank addess to i2c slave
		call	@I2CM_wait_not_busy		; wait for I2CM state machine to enter idle state
		call	@I2CM_get_byte			; Gets the byte from slave and returns it in w
		snb	I2CM_NACK			
		jmp	got_NACK			; indicate no NACK by entering never ending loop
		test	w				; check for null character read
		;jz	main				; null char, end of string...restart
		;mov	recv_char,w			; save received character
		;cjne	recv_char,#'S',bad_data	; used to confirm valid recieved matches stored data


Thanks a lot.

Alessandro (Italy)

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=261473#m261674

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)