Pcf8563p Rtc Trouble

[inse]

Hello Dan,

I had started a project using the PCF8563 a bout a year ago (not yet finished).
Without deeper analysing your code, I noticed, that you are using different addresses for read and write.
PBP handles this for you, read/write always to the address $A2.
You could also shorten your code by using multiple reads/writes like
I2CRead data_pin,clk_pin,rtc_read,reg_seconds,[seconds, minutes, hours...]

Regards,

Ingo

[-Dan-]

Hello Dan,

I had started a project using the PCF8563 a bout a year ago (not yet finished).
Without deeper analysing your code, I noticed, that you are using different addresses for read and write.
PBP handles this for you, read/write always to the address $A2.
You could also shorten your code by using multiple reads/writes like
I2CRead data_pin,clk_pin,rtc_read,reg_seconds,[seconds, minutes, hours...]

Regards,

Ingo

hi

did you get the pcf8563 to work then ?

in the datasheet it had different addresses for writing and reading so i just used them both in my code to be safe, ive changed a few things now i get 08:08:08 displayed i don't no we re those values come from, because there not the ones i'm writing to the registers

confuuuuusion!

[-Dan-]

anyone have any idea's then

one thing i forgot to do was add pull up resistors on the data and clock lines so i added 10k resistors to them and i get the values 16 for hours minutes and seconds, whether connected to the rtc or not.

with the data line being bi directional i don't no what to do in means of setting it as an input or an ouput, or do i just not define it as either.

Thanks

Dan

[Jerson]

- Dan -

I don't have exactly what you want, but I have worked on a PCF8583 from Philips. Perhaps they are similar. You figure it out. Use it as a guideline if you may. Part of init is to set the SDA and SCL lines as outputs via the TRIS command.

'================================================================================
' I2C   RTC PCF8583  CODE  using I2C_read and I2C_write routines of compiler
'================================================================================
' RTC registers are defined
' 0       -       Command / Status register
'   .0  timer flag
'   .1  alarm flag
'   .2  alarm enable 1 -  enabled
'   .3  mask flag
'   .54  function 00 clock 32.768KHz/01 clock 50Hz/10 evt counter/11 test
'   .6  hold last count flag
'   .7  stop counting, reset divider
' 1       -       1/10 s | 1/100s
' 2       -       10s    | 1s       seconds
' 3       -       10m    | 1m       minutes
' 4       -       10h    | 1h       hours
'   .3..0 unit hours BCD
'   .54   10s hours 0..2 binary
'   .6    1 PM
'   .7    1 12 hour format
' 5       -       10d    | 1day     Day & Year
'   .3..0 unit days BCD
'   .54   ten days 0..3 binary
'   .76   year 0..3 binary (read 0 if mask)
' 6       -       10mo   | 1month   month
'   .3..0 unit months BCD
'   .4    ten months
'   .7..5 weekdays 0..6 binary (read 0 if masked)
' 
' 0x10 to 0xff  RAM

' If RTC is not running, start it
TimerOff:
    I2CWRITE SDA, SCL, $A2, ControlReg, [0]
    return
    
' Read the time in BCD format
RTC_GetTime:
    I2Cread SDA, SCL, $A2, SecondsReg+0, [Time[2],Time[1],Time[0]]
    return

' Set time in BCD format
RTC_SetTime:
    I2Cwrite  SDA, SCL, $A2, SecondsReg+0, [Time[2],Time[1],Time[0]]
    goto  TimerOff

[inse]

Hi Dan,

i hope you got ahead with your code in the meantime.
My project is a clock (who could guess it?) with electromechanic seven segment displays.
The clock is running (1/2 hour behind by now) but the code for setting the time is still missing - as well as the buttons to be used for it.

You don't have to initialize the pins you use for I2C, it is done by the i2cread/i2cwrite commands.

I don't see what is causing the communication problems in your code - so i propose you check your hardware wiring.

Best wishes,

Ingo

[-Dan-]

Hi Dan,

i hope you got ahead with your code in the meantime.
My project is a clock (who could guess it?) with electromechanic seven segment displays.
The clock is running (1/2 hour behind by now) but the code for setting the time is still missing - as well as the buttons to be used for it.

You don't have to initialize the pins you use for I2C, it is done by the i2cread/i2cwrite commands.

I don't see what is causing the communication problems in your code - so i propose you check your hardware wiring.

Best wishes,

Ingo

hey

yer i got it working in the end, it turned out to be the 32.768 crystal i had, any way i swapped it out and it works ok now, apart from when it gets to say 9 seconds it skips to 16 but thats probably because i have no bcd conversions in my code?

Dan