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ACK or not ACK??this is the question.
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John Ilicitean

Joined: 07 Jul 2005
Posts: 27
Location: Rotova

Posted: Thu Feb 02, 2006 10:41 am

Hi everyone!!!

rwyoung wrote:

Quote:

And your PIC code timing EXACTLY matches that of the PC program's?

The timings of the PC program's is more slow.For example :
Tstart=120usg ------------------in the PC program
Tstart=4usg-------------------in my PIC system(slow mode)

This way all times are more slow, but in all cases the timing constraints are fulfilled .
The sequence of READ of PC program's is the same to that I use. But in my program don't send the ACK.

Humberto wrote:

Quote:

The Control byte of the ADS1100 is made up of 7 bits where you can preset (bits 3 thru 1),
leaving bit 0 alone (set to zero) as the I2C routine will use this bit depending if it is
a read or write operation... so the control byte would look like this...

1001yyy0

In your code you are addressing:

i2c_write(0x95); // ADC address, then read

wich is wrong because the bit 0 is SET.

If you have the variant AD5 as I guess, the address should be 0x9A

John Ilicitean wrote:

Quote:

When the PIC send the ADS1100 address(my device is AD2=1001010X) , the ADS1100 not send me the bit acknowledged.

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