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Forum Index : Microcontroller and PC projects : Internal RTC
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heppy36 Regular Member  Joined: 29/07/2011 Location: AustraliaPosts: 54 |
When say disconnect battery,will removing the jumper do,or should I un solder it? it seems to write ok but when I read,also if i just write then turn off it forgets Heppy |
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| seco61 Senior Member  Joined: 15/06/2011 Location: AustraliaPosts: 205 |
Hi. I do not have one of these eBay RTC devices, so I am not certain if the battery is permanently in circuit or not. When you disconnect power and remove the jumper is there any voltage on pin 8 of the PCF8563 IC (measure from ground to pin 8)? Either way, looking at the datasheet the control registers can be set to default values by writing them. Replacing the following line in the code will also update the control registers: 725 I2CSEND i2caddr, 0, 10, 0, 0, 0, seconds, minutes, hours, day, rtcwday, month, year regards Gerard (vk3cg/vk3grs) Regards Gerard (vk3cg/vk3grs) |
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jman Guru  Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Removing the jumper dissconnects the battery For normal use move the jumper to the batt position Thanks for code update Gerard i set my 8563 registers previous to using wr8563 :) I can confirm this line fixs the register setup problem 725 I2CSEND i2caddr, 0, 10, 0, 0, 0, seconds, minutes, hours, day, rtcwday, month, year Regards John |
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| heppy36 Regular Member Joined: 29/07/2011 Location: AustraliaPosts: 54 |
Thanks Gerard,but its still the sames as the Pic I sent,I think my ebay unit was probley a friday one,I will order another as other people seem to be working fine. I was going to get 2 (should off) Thanks again for all your help,realy is a appreciated Martin Heppy |
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| seco61 Senior Member Joined: 15/06/2011 Location: AustraliaPosts: 205 |
Hi. While it may be a dodgy unit, if you would like to send the unit to me I will put the logic analyser on it and check what is being sent and received from the unit. I will send it back with the results of the test. If this is of interest send me a private message (PM). I have also ordered a couple of units to test with. regards Gerard (vk3cg/vk3grs) Regards Gerard (vk3cg/vk3grs) |
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| jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi I have tried the below code (with Gerard's fix) on a never before used chip and it works To set the time and date 600 ' Get time from time$ and date$ 610 tempdec = VAL(LEFT$(TIME$, 2)) 615 GOSUB 1100 617 hours = hex 620 tempdec = VAL(MID$(TIME$, 4, 2)) 625 GOSUB 1100 627 minutes = hex 630 tempdec = VAL(RIGHT$(TIME$, 2)) 635 GOSUB 1100 637 seconds = hex 640 tempdec = VAL(LEFT$(DATE$, 2)) 645 GOSUB 1100 647 day = hex 650 tempdec = VAL(MID$(DATE$, 4, 2)) 655 GOSUB 1100 657 month = hex 660 tempdec = (VAL(RIGHT$(DATE$, 4)) - 2000) 665 GOSUB 1100 667 year = hex 670 ' rtcctrl = &h10 680 rtcwday= &h1 690 ' Write Time to RTC 700 i2caddr = &h51 ' PCF8563 I2C address 710 I2CEN 100,100 ' Enable I2C 725 I2CSEND i2caddr, 0, 10, 0, 0, 0, seconds, minutes, hours, day, rtcwday, month, year 730 I2CDIS 770 ? "0=ok 1=nack 2=timeout"; MM.I2C 780 END 1100 ' Convert to Hex 1110 hex = FIX(tempdec / 10) * 16 1120 hex = hex OR ((tempdec / 10) - (FIX(tempdec / 10))) * 10 1140 RETURN To read the time and date 100 ' I2C RTC based On PCF8563 Secs,Mins,Hours,Day,Date,Month,Year 200 DIM RTCbuff(255) 220 i2caddr = &h51 ' PCF8563 I2C address 250 I2CEN 100,100 ' Enable I2C 260 I2CRCV i2caddr, 0, 7, RTCbuff(0), 1, 2 265 I2CDIS 270 BCDTEMP = RTCBuff(0) AND &H7F ' Mask unwanted bits 280 GOSUB 1000 290 sec$ = STR$(decimal) 295 BCDTEMP = RTCBuff(1) AND &H7F ' Mask unwanted bits 300 GOSUB 1000 305 min$ = STR$(decimal) 310 BCDTEMP = RTCBuff(2) AND &H3f ' Mask unwanted bits 315 GOSUB 1000 320 hours$ = STR$(decimal) 325 BCDTEMP = RTCBuff(3) AND &H3f ' Mask unwanted bits 330 GOSUB 1000 340 day$ = STR$(decimal) 350 BCDTEMP = RTCBuff(5) AND &h1F ' Mask unwanted bits 360 GOSUB 1000 370 month$ = STR$(decimal) 380 bcdtemp = rtcbuff(6) 390 GOSUB 1000 400 year$ = STR$(decimal + 2000 ) 440 t$ = hours$+":"+min$+":"+sec$ 442 D$ = day$+"/"+month$+"/"+year$ 445 TIME$ = T$ 446 DATE$ = D$ 450 ? "Time has been set to ";T$ 460 ?"Date has been set to ";D$ 500 END 1000 ' Convert to Decimal 1010 Decimal = FIX(BCDTemp / 16) * 10 1020 Decimal = Decimal + (BCDTEMP AND &hF) 1030 RETURN Hope this helps Jman |
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| heppy36 Regular Member Joined: 29/07/2011 Location: AustraliaPosts: 54 |
Thanks I gave it try ,but still no luck. Gerard if you message me your details I will send it to you,see if you can see if it me or it!! Thanks again Martin Heppy |
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| seco61 Senior Member Joined: 15/06/2011 Location: AustraliaPosts: 205 |
Hi Martin. I received your RTC module today and have connected it to one of my maximite's, as well as to the logic analyser. It is working beautifully! It is keeping time and all the I2C data communications are correct. I am running it off the internal battery. I also connected a scope and frequency meter to the external clock out pin (along with a 30K pullup resistor) and it is showing a nice square wave at 32.76892kHz (which is a little fast - it will gain time at around 1 second every 10 hours). I will send it back to you tomorrow. Regards Gerard (vk3cg/vk3grs) |
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pcaffalldavis Senior Member Joined: 17/10/2011 Location: United StatesPosts: 187 |
Hello everyone. Newbie here from Alaska. I read this thread and the other RTC one and was hoping for a summary as I seem to have gotten confused. The PFC8653 is still available on ebay, though it looks a bit different. Link here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250846999 759&category=4661&_trksid=p5197.c0.m619 What I want to know or find is a complete set of installation instructions to put it on a SD1 DonTronics Maximite. I could use a list of basic coding to set it's date and time. One person on this thread seems to have had lots of troubles getting it going. Have others had it work straight away? And if there is a need to modify the PCB by cutting two connection points did everyone need to do this? Is it true, that once it is working that any time the Maximite is turned on or powered up the date$ and time$ will reflect the current time or is there some additional program lines that need to be added to whatever autorun.bas program the Maximite is set to run by default? Just a bit of overview please if that is possible. Sorry to be a newbie, but that is what I am. I've been writing Basic code for decades, but this type of project is new to me. Thank you all. Pete in Hyder Alaska We're all here 'cause we're not all there. |
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| jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Pete This should do the trick http://www.ebay.com/itm/PCF8563-RTC-Board-PCF8563-I2C-interf ace-3-3V-battery-/250846999759?pt=LH_DefaultDomain_0&hash=it em3a67a574cf This device use's the I2C interface you can moount it inside the case if you use the program header pins to mount the board you will need to make the PCB modifactions. The program I use is posted in this thread. Load it via autorun and your Maximite will allways start with the correct date and time Regards John |
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| pcaffalldavis Senior Member Joined: 17/10/2011 Location: United StatesPosts: 187 |
Thanks John. I just ordered up three of the PCF8563's for my three Dontronic SD1 Maximites. I'm still not sure where exactly to connect the wires, but that is because I don't know the difference between the I2C and the 26 pin connector. I'm guessing what you are saying is that the I2C connection points are somewhere in the middle of the PCB, not on the 26 pin connector. Like I said, I'm new to this. Maybe the I2C appears different on the Dontronic's boards? If so, I wonder if that means I must cut the connections in different places too? Just wondering. I will get your basic programs next. I saw two in one of the postings. Is that the post you are referring to? Thanks again, Pete in Hyder We're all here 'cause we're not all there. |
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| jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Pete This device is connected just like any other I2C device Pin 12 maps to MCU pin 43 (SDA1) and pin 6 on the I/O connector (revised schematic) or pin 21 (original schematic). Pin 13 maps to MCU pin 44 (SCL1) and pin 8 on the I/O connector (revised schematic) or pin 19 (original schematic). The PCF8563 has built in pullup resistors to the VCC line so no need for those You can get +5V from I/O connector pin 23 (revised schematic) or pin 3 (original schematic). A ground will also have to be run to the I2C device (I/O connector pins 1,2,25,26). This device will also run from 3.3V in that case pin 24 (revised schematic) or pin 4 (original schematic) So the short answer is yes the I2C signals are avaiable on the 26 pin connector John |
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| pcaffalldavis Senior Member Joined: 17/10/2011 Location: United StatesPosts: 187 |
Okay John. Thank you. I think I understand. So if I choose to permanently wire it in inside to MCU pins 43 & 44 is that the reason folks cut the PCB after these connections? To prevent any other connections to these same two I/O connectors since they have been permanently used for the clock? Pete We're all here 'cause we're not all there. |
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| Keith W. Senior Member Joined: 09/10/2011 Location: AustraliaPosts: 118 |
Hi Are RTC’s in the news again? I have built a small printed circuit using the Lazer Toner method for a M41T11 Real Time Chip purchased from Rockby Electronics, On-Special at 5 for $5. Crystals at 76c each, stock number 26005. The chips pin out and registers and I2C address are almost exactly as the DS1307 but this chip enables more precise calibration via the control register. I have not tried this yet. A suggested method requires running the clock for a month and then determining the correction required. My time-read program is built upon the work of others but I have added day of the week display, see below. Note that the string containing day names must have 9 characters for each day as Wednesday has 9 characters. I think no changes are required to run this program with a DS1307 RTC. I have added to the SETTIME program to ask for the day (1 to 7) and then set the day byte in the message to the RTC. The control byte for M41T11 is different to the DS1307. Set rtcctrl to &H40 to enable the frequency test output pin. If used output pin requires an external pull-up and 150 Hz output only. 10 ' Read I2C RTC (M41T11) for Secs,Mins,Hours,Day,Date,Month,Year,Control 20 ' 30 DIM RTCBuff(64) ' Allows for RTC's 56 byte ram also, but ram not used here 40 DIM Regs$(8) 'Save strings created from RTC's 8 registers here 50 ' 60 i2caddr = &h68 ' M41T11 I2C address = &B1101000X shifted 1 bit right 70 I2CEN 100,100 ' Enable I2C @ 100 KHz and 100 Ms timeout 80 I2CRCV I2CADDR, 0, 8, RTCBuff(0), 1, 0 ' Read 8 bytes from RTC chip 90 I2CDIS ' Disable I2C 100 ' 110 FOR i = 0 TO 7 ' Convert 8 Hex bytes to 8 strings in Regs$ array 120 Decimal = FIX(RTCBuff(i) / 16) * 10 ' Most sig nibble 130 Regs$(i) = STR$(Decimal + (RTCBuff(i) AND &H0F)) ' + least sig nibble 140 NEXT i 150 ' 160 Regs$(6) = STR$(VAL(Regs$(6)) + 2000 ) 'Add 2000 to RTC Year 170 ' 180 TIME$ = Regs$(2) + ":" + Regs$(1) + ":" + Regs$(0) ' Set the Maximite Time 190 DATE$ = Regs$(4) + "/" + Regs$(5) + "/" + Regs$(6) ' and Date 200 ' 210 PRINT : PRINT " ....Maximite Clock set from RTC...." : PRINT 220 PRINT "Maximite Time has been set to " ; TIME$ : PRINT ' From Maximite 230 ' 240 Days$ = "Sunday Monday Tuesday WednesdayThursday Friday Saturday " 250 dayoffset = ((RTCBuff(3) - 1) * 9) + 1 ' Multiply day of week * 9 + 1 260 Today$ = MID$(Days$,dayoffset,9) ' take required 9 characters from Days$ 270 ' 280 PRINT " Today is " + Today$ + ".. Date " ; DATE$ 290 END Keith W. |
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| roleyrev Newbie  Joined: 13/10/2011 Location: New ZealandPosts: 8 |
I like this idea, Is there a kit of parts for this? or will I have to do a mouser special Cheers Roleyrev |
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| Greg Fordyce Senior Member Joined: 16/09/2011 Location: United KingdomPosts: 153 |
My understanding is that the SM1 rtc circuit isn't supported by the current firmware. I would wait for 2.7 and see if this changes. |
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| jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
8563 files in a zip as requested John 2011-11-01_170454_8563.zip |
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VK6MRG Guru Joined: 08/06/2011 Location: AustraliaPosts: 347 |
I've got my setup described in this thread. <<HERE>> Hope it helps to spell it out a bit better. Its easier to ask forgiveness than to seek permission! ............VK6MRG.............VK3MGR............ |
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centrex Guru Joined: 13/11/2011 Location: AustraliaPosts: 320 |
Can someone tell me how you determine the i2caddr from the rtc data sheets. ie i2cadr = &H68 thanks centrex Cliff |
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crackerjack Senior Member Joined: 11/07/2011 Location: AustraliaPosts: 164 |
Look for the Data Read/ Write Slave address. See figures 4,5,6 in the Maxim datasheet. The address is given in binary: 1101000 which is &h68. This is for a DS1307. But the idea is to look for the Slave Address in the datasheets. |
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