Hi

I want find ack signal in EZUSB_i2c function. 

But i have not oscilloscope so i need to find way without oscilloscope to find ack status . 

And i want find status ack signal in read or write in i2c. 

So, is there any way how to find ack signal ?

I found me a logic analizer to check my I²C connection and it worked like a charm, not only showing ACK/NAK but the address and data transferred as well. Depending on where you are located, you'll use a different manufacturer, I bought mine from here : http://www.ikalogic.com/

Bob

 Thanks. But it is not what i want answer. 

 Hi

You can check the ACK flag  after writing the I2C data and report 1 or 0 on EP0 endpoint and check what value you are receiving on the EP0.

For Eg check the following code:

BYTE y;

y=0;

while (I2CS & bmSTOP);

// set the START bit and write the address

I2CS = bmSTART;

I2DAT = SETUPDAT[5];

while (!(I2CS & bmDONE));

while (!(I2CS & bmACK));

// write at requested address

I2DAT = SETUPDAT[3];

while (!(I2CS & bmDONE));

while (!(I2CS & bmACK));

I2DAT = SETUPDAT[2];

while (!(I2CS & bmDONE));

while (!(I2CS & bmACK));

// write at requested byte

I2DAT = SETUPDAT[4];

while (!(I2CS & bmDONE));

while (!(I2CS & bmACK));

I2CS = bmSTOP;

y=1;

EP0BUF[0]=0xFF;

EP0BCH=0;

EP0BCL=1;

In the above code snippet, for IN transfer you will receive 0xFF on EP0 if all the I2C tranfers complete otherwise the program will get stuck in loop:  while (!(I2CS & bmACK));

and the IN transfer would fail.

I hope this post answers your question.

Thanks

Nikhil