AXE091 board and DS1307

T

Tony P

Member
Page 8 of the AXE091 manual reads:

"A 3V lithium backup cell may be optionally
connected to the DS1307 RTC chip. This can be
achieved in either of two ways:
- by soldering a BAT004H-SM socket to
the bottom of the board...."

How? Where?

Please help
 
T

Tony P

Member
Ahhhh all becomes clear. I have been sold the wrong battery holder by Techsupplies even though I bought the parts as a 'kit'

Many thanks
 
T

Tony P

Member
My next question is:

How do I use the DS1307 on the project board? There is not much info in the manual (not that I can understand anyway!!)
 
T

Tony P

Member
Having hooked up the SDA/SCL connections that are shared between the DS1307 and the EEPROM to the i2c pins on your PICAXE, read the i2c tutorial.
Click to expand...
I have followed all instructions to the letter but if I try to display the time on my AXE033 LCD all I get is 255:255:255 as the time
 
Bill.b

Bill.b

Senior Member
Hi Tony

Could you post your code for comment.

and may be a picture of you connections.

Bill
 
T

Tony P

Member
I have the the SCL output connected to pin 7 and the SDA output connected to pin 10 of my 18M2


Code: 
#PICAXE 18M2
	hi2csetup i2cmaster, %11010000, i2cslow, i2cbyte
	

MAIN:
	PAUSE 2000
	hi2cin 0,(B0,B1,B2)
	DEBUG 
	serout B.7,N2400, (254, 1)
	pause 500			
	serout B.7,N2400, (254,128)
	serout B.7,N2400, (#B0,":",#B1,":",#B2)
	GOTO MAIN
 
T

Tony P

Member
Sorry that is the way I have it wired. Been a long night!!

I am now getting 128:0:0 as the display and I have done nothing different
 
T

Tony P

Member
I also realised that I posted the wrong code. Here is the correct one

Code: 
#PICAXE 18M2
	 i2cslave %11010000, i2cslow, i2cbyte


MAIN:
	PAUSE 2000
	hi2cin 0,(B0,B1,B2)
	DEBUG 
	serout B.7,N2400, (254, 1)
	pause 500			
	serout B.7,N2400, (254,128)
	serout B.7,N2400, (#B0,":",#B1,":",#B2)
	GOTO MAIN
 
W

westaust55

Moderator
The reason you are seeing values like 128 is that the values you read in from the DS1307 are in BCD format.

Your will need to use the BCDTOASCII command for the seconds, minutes and hours to generate separate tens and units digits and then send these to the display.
To save on having to use many variables, use the BCDTOASCII with the hours first and send that to the display, then do the minutes and finally the hours.

Try this:

Code: 
#PICAXE 18M2
	 i2cslave %11010000, i2cslow, i2cbyte


MAIN:
	PAUSE 2000
	hi2cin 0,(b0,b1,b2)
	DEBUG 
	serout B.7,N2400, (254, 1)
	pause 500			
	serout B.7,N2400, (254,128)
	b4 = b2 : GOSUB Convert : SEROUT B.7, N2400, (":")
	b4 = b1 : GOSUB Convert : SEROUT B.7, N2400, (":")
	b4 = b0 : GOSUB Convert 	
		GOTO MAIN
	
Convert:
	BCDTOASCII b4,b5,b6
	SEROUT B.7, N2400, (b5,b6)
	RETUR
 
T

Tony P

Member
Thankyou Thankyou Thankyou!! westaust55

Why are things like this not written in the manuals and the example codes?
 
N

nick12ab

Senior Member
Tony P said:
Why are things like this not written in the manuals and the example codes?
Click to expand...
Yes it is - from i2c tutorial: "All the time/date data is in BCD (binary-coded-decimal) format"

To be fair, the i2c tutorial does not contain a good example for displaying the time, and the example here is not very good at all.
 
Bill.b

Bill.b

Senior Member
This code will display in 12 hour format. This is only part of complete clock program.

Code: 
symbol TempHour 		= b24		'Tempory store - Hours
symbol OLED		= b.7		'Serial output to display
symbol Baud		= N2400	'Set serial output baud rate
symbol seconds 		= b7		'DS1307 seconds
symbol mins 		= b8		'DS1307 minutes
symbol hour 		= b9		'DS1307 Hour
symbol day 		= b10		'DS1307 day
symbol date 		= b11		'DS1307 Date
symbol month 		= b12		'DS1307 Month
symbol year 		= b13		'DS1307 Year
symbol control 		= b14		'DS1307 Control
symbol AsciiData1 	= b17		'Ascii data for display on LCD
symbol AsciiData2 	= b16		'Ascii data for display on LCD
symbol AsciiData3 	= b20		'Ascii data for display on LCD
symbol AsciiData4 	= b19		'Ascii data for display on LCD
symbol AsciiData5 	= b23		'Ascii data for display on LCD
symbol AsciiData6 	= b22		'Ascii data for display on LCD
symbol AsciiData7 	= b25		'Ascii data for display on LCD



	pause 2000
	serout OLED,Baud,(254,1)			'Clear Display

main:
	gosub TimeDate12
	goto main
TimeDate12:

	gosub readtime			'get current time form DS1307
	serout OLED,Baud,(254,128)    'calculate 12 hour display from 24h data
	Temphour = hour
	if hour >9 then
		Temphour = hour - 6
	endif
	if hour >18 then
		 Temphour = hour - 18
	endif
	if hour >25 then
		 Temphour = hour - 24
	endif
	if hour =0 then
		Temphour = 12 
	endif
	bintoascii Temphour,AsciiData7,AsciiData2,AsciiData1	'Convert Time  To ASCII for display
	bcdtoascii mins,AsciiData4,AsciiData3
	bcdtoascii seconds,AsciiData6,AsciiData5
	if AsciiData2 = 48 then					'remove leading 0
		serout OLED,Baud,("    ",AsciiData1,":",AsciiData4,AsciiData3,":",AsciiData6,AsciiData5)
	else
		serout OLED,Baud,("    ",AsciiData2,AsciiData1,":",AsciiData4,AsciiData3,":",AsciiData6,AsciiData5)
	endif
				'display am or pm 
	if hour > 17 then
		serout OLED,Baud,(" pm    ")
	else
		serout OLED,Baud,(" am    ")
	endif
	serout OLED,Baud,(254,192)
	return
	
	
readTime:
	hi2csetup i2cmaster, %11010000, i2cslow, i2cbyte    	' set DS1307 slave address
	hi2cin 0,(seconds,mins,hour,day,date,month,year)  	'Read date and Time
	return

Bill
 
Hemi345

Hemi345

Senior Member
Tony P said:
Why are things like this not written in the manuals and the example codes?
Click to expand...
Because it seems they don't want to give all the answers, just enough information to either push you in the general direction or frustrate the hell out of you. This topic has been asked so many times, you would think they would just put a working example on the website in the Circuit Creator section or even a link to the I2C tutorial in the Commands section of the website or Manual 2. I eventually found the I2C tutorial a few months back in the datasheets section but still looking for the elusive one-wire tutorial.
 
W

westaust55

Moderator
Such information is also given in the DS1307 Datasheet.

It really is worth downloading (readily available - just google) the relevant Datasheet for any new IC/chip that you are going to use.
 
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