C example code for ADS1146

Bob,

thanks for your reply, it will help to find our problem.

Uwe

Bob,

we are able to read out the ADS1146 but we have still the problem that we are not able to send any command to the ADS1146.

Do you have any idea?

Here our handling:

1st     STARDAD =1  and RESET =0
2nd    Wait 20ms
3rd     STARDAD=1 and Reset = 1
4th     Wait auf first DRDY

5th     CS=0
6th     Send command 0x17 (SDATC)
7th     CS= 1
8th     Wait 20ms
9th     CS=0
10th   Send command 0x42
11th   Send 0x01
12th   Send 0x00
13th   Send 0x08
14th  CS = 1
15th  Wait 20us
16th  CS = 0
17th  Send command 0x22
18th  Send 0x01
19th  Send 0xff (Read from ADS)
20th  Send 0xff (Read from ADS)
21st  CS = 1
22nd Wait 20us
23rd  CS = 0
24th  Send commad 0x14 (RDATAC)
25th  CS = 1

SPICLK = 1MHz

Something wrong?

UWE

Uwe,

When you send the SDATAC command, it does not take effect until the next DRDY.  I believe the problem you are having is that the conversion data is being placed in the output register at the same time you are trying to write registers, and this may be causing a conflict.  Make sure you wait for the next DRDY after the SDATAC command before you actually write the register data.

Best regards,

Bob B

Hello Bob,

I have also wait 300ms after sending SDATAC without any success.
On the oscilloscope you can see the right wave form for the command WREG and  RREG but there is no reaction or answer from the ADS1146.

I am still not able to write any command to the ADS1146, because the DRDY is still every 200ms.

Do you have any idea or comment to get the ADS1146 running, or do you have a proposal for another type of A/D-converter which is easier to get working.

By the way, after the bad experience with the ADS1146 I have tried to make the start up for the D/A-converter (Its coming from Maxim) and its running at once without any problem, therefore I am sure the signals MOSI and MISO are correct.

Desperate greetings

Uwe      

Uwe,

It appears that the SDATAC command is not working, and this may be a result of the timing.  Try reading back the data completely first, then send the SDATAC command.  It would be helpful if you would send me some screen shots of the actual commands you are sending so that I can verify the timing of that as well.

Best regards,

Bob B

Hello Bob,

I try to make some screenshots tomorrow.

Best regards
Uwe

Hello Bob,

today I have done some more measuring and found no problem in our software.
Therefore I have replaced the ADS1146 and now everything is working.

Thank you for your assistance and merry Christmas.

Uwe