IOIOlib 3.2 Tested and is good for I2C
:sign0060:
IOIOlib 3.2 Tested and is good for I2C with DS1307. pin25 & 26 used.
code:
Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.
   Dim period As Int
   Dim TimerLoop As Timer
   Dim btnSend As Button
   Dim btnSetUp As Button
   Dim Label1 As Label
   Dim Label10 As Label
   Dim Label3 As Label
   Dim Label4 As Label
   Dim Label5 As Label
   Dim Label6 As Label
   Dim Label7 As Label
   Dim Label8 As Label
   Dim Label9 As Label
   Dim rbtn_loop As RadioButton
   Dim rbtn_Single As RadioButton
   Dim spn_TWIRate As Spinner
   Dim spn_Twimode As Spinner
   Dim spn_Addbit As Spinner
   Dim txt_Readbytelength As EditText
   Dim txt_Writebytelength As EditText
   Dim spn_Period As Spinner
   Dim txtRX As EditText
   Dim txtAddress As EditText
   Dim PeriodMap As Map
   Dim p_uart As Panel
   Dim lbStatus As Label
   
   Dim YOYO As IOIO
   Dim led As DigitalOutput
   Dim go As Boolean
   Dim TPeriod As Int
   Dim looped As Boolean
   Dim LedFlag As Boolean
      
   Dim TWI As TwiMaster
   Dim chk_SMBUS As CheckBox
   Dim smBUS As Boolean
   Dim TWIMODE As Int
   Dim TWIRATE 
   Dim WriteByteLength As Int
   Dim ReadByteLength As Int
   Dim tenbitadd As Boolean
   Dim TWIaddress As Int
   'Dim TWI As TwiMaster
   
End Sub
Sub Activity_Create(FirstTime As Boolean)
   Activity.LoadLayout("aI2C")
   activity.Title="IOIO I2C TEST READ DS1307"
If FirstTime Then
   activity.AddMenuItem("UART","aUART")
   activity.AddMenuItem("I2C","aI2C")
   activity.AddMenuItem("SPI","aSPI")
   activity.AddMenuItem("IO","aIO")
   activity.AddMenuItem("ADC","aADC")   
   SetSpinner
   'default mode0,DA=4, CL=5, rate=100KH)
   spn_Twimode.SelectedIndex=2
   spn_TWIRate.SelectedIndex=0
   spn_Period.SelectedIndex=4
   spn_Addbit.SelectedIndex=0
   txt_WriteByteLength.text=1
   txt_ReadByteLength.text=7
   txtAddress.Text="104"
   TimerLoop.Initialize("TimerLoop",1000)
   
   go=False
   looped=False
   rbtn_Single.Checked=True   
   
   YOYO.Initialize
   YOYO.WaitForConnect()
   led = YOYO.OpenDigitalOutput(0,led.OP_NORMAL ,True) ' Enable LED_PIN for output
   getSetUPValue
   TWI=yoy

penTwiMaster(2,Twi.RATE_100KHz,False)
   Dim i As Int
   Dim wBuffer(2) As Byte
   Dim rBuffer(7) As Byte
   Dim Rs() As Boolean
   Dim suc As Boolean
   Dim tmp As String
   For i=1 To 5
      wBuffer(0)=0
      If twi.IsInitialized=True Then
         result=TWI.WriteRead(0x68,False,wbuffer,1,rBuffer,0) 
         result=TWI.WriteRead(0x68,False,wbuffer,0,rBuffer,7) 
         If result=True Then
            lbStatus.Text="Read " & 7 & " bytes. @ " & DateTime.Time(DateTime.Now)
             txtRX.Text= Bit.ToHexString(rbuffer(6)) & "/" & _ 'sec
                  Bit.ToHexString(rbuffer(5)) & "/" & _ 'min
                  Bit.ToHexString(rbuffer(4)) & " " & _ 'hour
                  Bit.ToHexString(rbuffer(2)) & ":" & _ 'day
                  Bit.ToHexString(rbuffer(1)) & ":" & _ 'month
                  Bit.ToHexString(rbuffer(0))           'year
         End If
      Else
         Msgbox("NOT ready","")
      End If
      waitms(1000)      
   Next
   
End If
   
End Sub
Project will be posted later.
Best,
Eric