I2C 5720

[lgitlitz]

The I2CInit function has overloaded parameters. You should just be able to call I2CInit(); and the speed divide parameter will be set to 0x16. This is just under 100KHz. The slave device on the bus should be able to slow the clock down if needed so I doubt this would be a problem. You definitely need to call the init function, you have it commented out in your code.

A good first step in debugging would also be to scan through all the addresses on the bus. There was a recent post where code was posted showing how to do this: http://forum.embeddedethernet.com/viewt ... ?f=5&t=730. You should copy the code that scans through all I2C addresses and see if your device is detected.

-Larry

[bobturner5791]

Larry,

I implemented the code to scan through all my address. I did not find my address. I have just bread boarded a LM75 and have attached it to my net burner programing board. So I should have seen 0x47 or 78 respond back. I have attached my scope and I can see the data and the clock. But I am still getting error number 4.

I did changed my code to I2CMaster, because all my device are slaves.

#ifdef _I2CMASTER_H
address = 0x1001111;

float i;

for( int x =0; x<128; x++)
{
if( I2CStart( x, I2C_START_READ ) < I2C_TIMEOUT )
iprintf("We have a %X on the bus\r\n", x );
I2CStop();
}



/* I2CInit( address ); */

I2CStat = ( I2CReadBuf(address, buffer, 3));


if( I2CStat == I2C_OK )
{
printf("Master RX: %x, %x\r\n", buffer[0], buffer[1]);
printf( "Receive successfully\r\n" );
}
else
iprintf( "Failed to read due to error: %d\r\n", I2CStat);
#endif

Here is my out put.

Failed to read due to error: 4
Waiting 2sec to start 'A' to abort
Configured IP = 192.168.1.75
Configured Mask = 0.0.0.0
MAC Address= 00:03:f4:03:fb:c2
Failed to read due to error: 4
Waiting 2sec to start 'A' to abort
Configured IP = 192.168.1.75
Configured Mask = 0.0.0.0
MAC Address= 00:03:f4:03:fb:c2
Failed to read due to error: 4
Waiting 2sec to start 'A' to abort
Configured IP = 192.168.1.75
Configured Mask = 0.0.0.0
MAC Address= 00:03:f4:03:fb:c2
Failed to read due to error: 4
Waiting 2sec to start 'A' to abort
Configured IP = 192.168.1.75
Configured Mask = 0.0.0.0
MAC Address= 00:03:f4:03:fb:c2
Value of X 0
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Failed to read due to error: 4


Bob

[seulater]

There is something wrong with the code, your device is resetting.
show all your code.

[bturner5791]

That is my code except where I do my includes.
Larry, I just spoke with a friend and I was not using the correct pins on the 5270 module. when I saw data. When I am conecetd to J2 pins 39 and 42 I do not see any data on the buss. All I have connected is my lm75 on a bread board where A0 A1 A2 are tied to vcc which is 3.3v. Pin 1 and 2 SCL and SDA both tied to there own 10k resistor to vcc. An I do not see any thing on the out put.
Here are my questions.
1. If I disconnect my LM75 from the module and run the loop Larry recommended I should see at least device 8 respond correct?
2. Do I have to initialize the I2C Port?

Sorry for asking such basic questions

Bob

[seulater]

you still have not commented out the I2CInit( );
you need that for it to work.

[bturner5791]

So you need to inable the buss with I2CInit( );
Bob

[seulater]

yup