Set and read a DS1307 real time clock

Example of how to use DS1307 Time Clock (i2c device) Note the data is sent/received in BCD format.

Code Example:

symbol seconds = b0
symbol mins = b1
symbol hour = b2
symbol day = b3
symbol date = b4
symbol month = b5
symbol year = b6
symbol control = b7

	; set DS1307 slave address
	
	i2cslave %11010000, i2cslow, i2cbyte

	; Initialise the clock - "Thu 2003-12-25 11:59:00" 

	let day     = $03	; 03 Note all BCD format
	let year    = $03	; 03 Note all BCD format
	let month   = $12	; 12 Note all BCD format
	let date    = $25	; 25 Note all BCD format
	let hour    = $11	; 11 Note all BCD format
	let mins    = $59	; 59 Note all BCD format
	let seconds = $00	; 00 Note all BCD format
 	let control = %00010000 ; Enable output at 1Hz

	writei2c 0,(seconds,mins,hour,day,date,month,year,control)
main:
	; Read the clock time

	readi2c 0,(seconds,mins,hour,day,date,month,year)
	
	; Report time read

	debug

	pause 500
	goto main

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