B4R Tutorial Reading & Writing Time of DS1307 With ESP32 Using rWire

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 600
#End Region
'Ctrl+Click to open the C code folder: ide://run?File=%WINDIR%\System32\explorer.exe&Args=%PROJECT%\Objects\Src

Sub Process_Globals
    Public Serial1 As Serial
    Private Wire As WireMaster
    Dim Sec,Minute,Hour As Byte
    Private Timer1 As Timer
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)  'GPIO 22--SDA GPIO 21-SCL
    Log("AppStart")              'Tested ok on 01/06/23
    Wire.Initialize               'Tiny RTC Module
    Delay(10)                     'DS1307 address-0x68
    Timer1.Initialize("Timer1_Tick",1000)
    Timer1.Enabled=True            'only time is show here
End Sub

Sub Timer1_Tick
    Log("tmr running")
    Read_RTC
End Sub

Sub Read_RTC
    'Log("read rtc sub")
    Dim B(7) As Byte
    Wire.WriteTo2(0x68,True,Array As Byte(0))'ds1307 set register pointer to zero
    B=Wire.RequestFrom(0x68,7) 'read first seven register contain sec,min,day,hour,date,month,year
    Log("secinBCD=",B(0))
    Log("mininBCD=",B(1))
    Log("hourinBCD=",B(2))
    Sec=BCD_2_decimal(B(0))
    Minute=BCD_2_decimal(B(1))
    Hour=BCD_2_decimal(B(2))
    Log("Time ",Hour,":",Minute,":",Sec)
    Log("stackBufferUse=",StackBufferUsage)
    'Read_RTC
End Sub

Sub BCD_2_decimal(value As Byte) As Byte
    Dim MSB,LSB,DecValue As Byte
    MSB=value/16
    LSB=value Mod 16
    DecValue=(MSB*10)+LSB
    Return DecValue
End Sub

'----------------------------------------------------------------- Set time to DS1307 ------------------------------------------------------------------

Sub Set_Time_DS1307
    Dim mySEC,myMin,myHour,myDay,myDATE,myMONTH,myYear As Byte
    Dim data(8) As Byte
    mySEC=00
    myMin=03
    myHour=23
    myDay=4
    myDATE=1
    myMONTH=6
    myYear=23
    data(0)=0
    
    data(1)=Decimal_2_BCD(mySEC)
    data(2)=Decimal_2_BCD(myMin)
    data(3)=Decimal_2_BCD(myHour)
    data(4)=Decimal_2_BCD(myDay)
    data(5)=Decimal_2_BCD(myDATE)
    data(6)=Decimal_2_BCD(myMONTH)
    data(7)=Decimal_2_BCD(myYear)
    wire.WriteTo2(0x68,True,data)
    Log(" DS1307 bcd write complete")
End Sub

Sub Decimal_2_BCD(value As Byte)As Byte
    Dim MSB,LSB,bcdValue As Byte
    MSB=value/10
    LSB=value Mod 10
    bcdValue=(MSB*16)+LSB
    Return bcdValue
End Sub