what am I doing wrong

[MBB]

I'm using this RTC https://www.adafruit.com/product/3028 module.
This is the data sheet https://datasheets.maximintegrated.com/en/ds/DS3231.pdf for the IC.

On page 11 of the data sheet it shows the register set up. I'm having trouble with register 02h which sets up the hours. The minutes, seconds, day, and date portions are working

I wrote this code to trouble shoot the hours portion:

;Chip Settings
    #chip 18F4550,48
        #config PLLDIV=1, CPUDIV=OSC1_PLL2, OSC=HSPLL_HS, LVP=OFF, MCLRE=ON

       ;Defines (Constants)
        #define LCD_IO 2
            #define LCD_CB PORTE.1
                #define LCD_DB PORTE.0

Dim HourSTR, Time_HourSTR, Hour_12_24_PM_AM_STR as String

Do_Again:
' The below 2 commands should produce b01100011 which = 99 in decimal OR 3 PM in 12 hour mode
  Hour_12_24_PM_AM_STR = "011" ;Bit 7 = 0,  Bit 6 is 12 Hour = 1 & 24 Hour = 0, Bit 5 is PM = 1 & Am = 0
    Hour = 3 ; 1 - 9

      Hour = DecToBcd_GCB(Hour) ;Per Data sheet the time portion must be in BCD format

        Time_HourSTR = Hour_12_24_PM_AM_STR + Right(ByteToBin(Hour), 5)
          locate 0, 0
            print Time_HourSTR ;Should print out 01100011 and it does

              Time_Hour = Val(Time_HourSTR) ;This is NOT WORKING
                locate 1, 0
                  print Time_Hour ;This prints out 235. It should print 99.

wait 1 s
cls
goto Do_Again

I thought the line Time_Hour = Val(Time_HourSTR)
would convert 01100011 to 99. It doesn't. I get 235..

Any ideas?

[Anobium]

Why not start with the DS3231 library? See http://gcbasic.sourceforge.net/help/_libraries_overview.html

And, the demos in your installation? See C:\GCB@Syn\GreatCowBasic\Demos\real_time_clock_solutions. There are many demos for the DS3231 and the documentation is in the directory C:\GCB@Syn\GreatCowBasic\Demos\real_time_clock_solutions\clocks

[MBB]

Thanks! I'll try these.

[MBB]

I'm still curious why the code I wrote did not work. Any idea?

[Anobium]

Starting with the string.... the binary string of 01100011 is a numeric value of 1100011. So, know this we need to figure out what is going on.

This is caused by lots of little errors.

Use Option Explicit. This will start to reveal the issues. As you are NOT using Option explicit everything is assummed to by a Byte.

When Time_Hour as Long. As the string 1100011 is a lomg number, using the VAL32 method you get the correct result.

Str  :01100011
Val32: 1100011

So, I would not be using a string to handle binary byte values.....

My proof code.

    #chip 18F47K42
    #option Explicit

    'USART settings
    #define USART_BAUD_RATE 9600
    #define USART_TX_BLOCKING

    'Generated by PIC PPS Tool for Great Cow Basic
    'PPS Tool version: 0.0.5.26
    'PinManager data: v1.76
    'Generated for 18F47K42
    '
    'Template comment at the start of the config file
    '
    #startup InitPPS, 85
    #define PPSToolPart 18F47K42

    Sub InitPPS

            'Module: UART pin directions
            Dir PORTC.6 Out    ' Make TX1 pin an output
            'Module: UART1
            RC6PPS = 0x0013    'TX1 > RC6

    End Sub
    'Template comment at the end of the config file


    Dim HourSTR, Time_HourSTR, Hour_12_24_PM_AM_STR as String
    Dim Hour  as word
    Dim Time_Hour as long

    do
        ' The below 2 commands should produce b01100011 which = 99 in decimal OR 3 PM in 12 hour mode
        Hour_12_24_PM_AM_STR = "011" ;Bit 7 = 0,  Bit 6 is 12 Hour = 1 & 24 Hour = 0, Bit 5 is PM = 1 & Am = 0
        Hour = 3 ; 1 - 9

        Hour = DecToBcd_GCB(Hour) ;Per Data sheet the time portion must be in BCD format

        Time_HourSTR = Hour_12_24_PM_AM_STR + Right(ByteToBin(Hour), 5)
        HSerPrint "Str  :"
        hserprint Time_HourSTR ;Should print out 01100011 and it does
        HSerPrintCRLF

        HSerPrint "Val32: "
        Time_Hour = Val32(Time_HourSTR)
        hserprint Time_Hour
        HSerPrintCRLF

        wait 1 s

    loop