Set I2C dataPort, clockPort

The Set I2C command sets the data port (SDA) and clock port (SCL), for I2C communication. Once this command is executed, both ports' I/O modes become output, and their outputs become logic high. For I2C communication please use ports capable of both input and output and 4.7K resistors as shown below.

It may also help to add 100 Ohm damping resistors to the I2C lines, to dampen signal reflections or other sources of noise.

I2C communication requires ports capable of both input and output, but some ports are only capable of either input or output. Please check the port specifications in the data sheet for the model you are using

Const Device = CB220
Dim adr As Integer
Dim data As Byte
Dim a As Byte
data = &ha6
adr = &h3
Set I2C 7,6
Do
  I2CStart
  If I2CWrite(&b10100000)= 1 Then Goto err_proc
  a=I2CWrite(adr.byte1)
  a=I2CWrite(adr.lowbyte)
  a=I2CWrite(data)
  I2CStop
  Delay 1000
  I2CStart
  a=I2CWrite(&b10100000)
  a=I2CWrite(adr.byte1)
  a=I2CWrite(adr.lowbyte)
  I2CStart
  a=I2CWrite(&b10100001)
  a=I2CRread(0)
  I2CStop
  Debug Hex a,cr
  ADR = ADR + 1
  DATA = DATA + 1
Loop
 
err_proc:
  Debug "Error !"
  Do
  Loop

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