Re: programming i2c device with TINIs400

thanks for your help... I am new with I2C...

this is my test code :
 I2CPort port = new I2CPort();
 //port.setStretchCycles(I2CPort.STRETCH0);
 port.setClockDelay((byte)2);
 port.slaveAddress = (byte)0x70;  //the SAA 1064 is at 0x70 (write) 0x71
(read) is slave adress ok (see below...)
 while(i<500) {
     System.out.println("i2ctest read V0.1.0 "+i++);         
len=port.read(b,0,1);
     if (len>0) System.out.println("i2c read "+new String(b,0,len));
//tini prints nothing
     try {Thread.sleep(50);}catch(Exception e){}
 }

I get a scope, I do not see any acknoledge from slave...
-----_----------_______-----------_------- ---    SDA

------_--_--_--_--_--_--_--_--_--_-----------   SCL   T#10µs

I will try with another hardware (I have now an I2C eval. board from
Philipps...)

BTW, from i2ctest.java (tini1.12/examples) I think that the choice of
slave adress is erroneous  according comment on previous line ? // Set
I2C slave we want to talk to.  0x90 in this case. //should be 0x48
     port.slaveAddress = (byte)0x48;   //or should be 0x90 ???


Gerry Dubois wrote:
I've just got my I2C running on a similar HW configuration (TINITs400 with
5V I2C bus). This is the code I used (straight from the demo app )
port = new I2CPort();
port.setClockDelay((byte)2);
Works great. I'm controlling PCF8574 8-bit I/O expanders.
Unfortunately with the limited information provided it's impossible to tell
if you have a hardware or software problem. Can you post the pertinent code
fragments?


RP


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