Instructions

301 C-Control Pro IDE

End If

OneWire_Write(0xcc) ' skip ROM cmd

OneWire_Write(0x44) ' start temperature measure cmd

AbsDelay(3000)

OneWire_Reset(7) ' PortA.7

OneWire_Write(0xcc) ' skip ROM cmd

OneWire_Write(0xbe) ' read scratch_pad cmd

For i = 0 To 9 ' read whole scratchpad

scratch_pad(i)= OneWire_Read()

Msg_WriteHex(scratch_pad(i))

Msg_WriteChar(13)

Text = "Temperature: "

Msg_WriteText(Text)

temp = scratch_pad(1) * 256 + scratch_pad(0)

Msg_WriteFloat(temp * 0.5)

Msg_WriteChar(99)

Msg_WriteChar(13)

Lab Ende

End Sub

5.18 Port

Atmel Mega

The Atmel Mega 32 provides 4 input/output ports at 8 bits each. The Atmel Mega 128 provides 6 in-

put/output ports at 8 bits each and one input/output port at 5 bits. Each bit of the individual ports can

be configured as input or output. Since however the number of pins in the Mega 32 Risc CPU is lim-

ited, additional functions are assigned to individual ports. A pin assignment table for M32 and M128

can be found in the documentation.

It is important to study the pin assignment prior to programming since important functions of the

program design (e. g. the USB Interface of the Application Board) are assigned to specific ports. If

these ports are programmed differently or the corresponding jumpers on the Application Board are no

longer set it may happen that the design interface is no longer able to transfer programs to the C-

Control Pro.

The direction of data flow (input/output) can be determined with function Port_DataDir or

Port_DataDirBit. If a pin is configured as input then this pin can either be operated high resistive

("floating") or with an internal pull-up resistor. If with Port_Write or Port_WriteBit a "1" is written to an