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Forum Index : Microcontroller and PC projects : I2C Scan Utility

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crackerjack

Senior Member

Joined: 11/07/2011
Location: Australia
Posts: 164

Posted: 10:38am 19 Mar 2012

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Ever get baffled by I2C addressing? Sometime unsure if your I2C device is present on the bus?

Here is a little utility I wrote to help with those I2C address issues which sometimes arise. If there is an earlier, better solution, please let us all know. If there are issues with the code (or it doesn't work for you), post the fix! Even better still, if you use 10-bit addressing and can enhance the scanner - well, you know what to do...

I'd be happy to hear if this helps anybody out.

[code]
' I2CScan Utility - crackerjack, March 2012
' Function: Scans the full 7-bit I2C Address range
' and reports addresses where device
' responds to an "i2csend".
' Addresses are shown as "raw" and
' 7-bit (W/R). Use 7-Bit addressing
' with MMBasic's I2C implementation.
' ------------------------------------------------------------ ------------
Cls

I2CEN 100, 100 ' Enable I2C at 100kHz, Timeout 100 mS

? "Searching I2C 7-bit address space..." Chr$(10)
? "Found device(s) at:" Chr$(10)

' Raw Write Raw Read
' ---- ------ ---- ------
' 0xA0(0x50 W) 0xA1(0x50 R)

For i=&h8 To &h77 ' Valid 7-bit I2C address range
I2CSEND i, 0, 1, 0 ' Send a single-byte to the address
If MM.I2C = 0 Then ' An ACK was received, device @ this address
' Left-shift address for "raw" display value
? "0x" Hex$(i*2) "(0x" Hex$(i) "W) 0x" Hex$(i*2+1) "(0x" Hex$(i) "R)"
EndIf
Next i

? Chr$(10)
I2CDIS ' Disable I2C

' ------------------------------------------------------------ ------------
[/code]

Enjoy...

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