Nucleo interfaced with ADS1293

[tejasharma13]

Hello Community,
I'm trying to interface STM32 P-NUCLEO-WB55 with ADS1293 via SPI communication protocol, But there is a issue I'm unable to read data, to verify the SPI I tried to print "Reg10 = %d\r\n" but it is returning zero as value. I'm attaching the connections diagram and ioc diagram and code file, Can anyone please help me with where I'm getting wrong..
Thank you

[Peter BENSCH]

Welcome @tejasharma13, to the community!

I’m afraid there won’t be much we can do to help you here. A similar question was already asked here, and it was explained to the person asking that the question would probably be better suited to TI.

Hope that helps?

Regards
/Peter

[tejasharma13]

Hey Peter, Thanks for the reply
The reply on that question says that it would be appropriate to inquire in TI, but I have used the same breakout board with Arduino Nano and achieved results. However, when I attempted to connect it with Nucleo, the values did not appear.

[Andrew Neil]

So have you done as advised in that other thread:

1. Use an oscilloscope to verify that the signals are clean, with good edges, at the correct levels, etc;
2. Use a logic analyser to verify the SPI activity. 

 

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@tejasharma13 wrote:

 I have used the same breakout board with Arduino Nano and achieved results. .

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So use your  logic analyser to capture traces of both the Arduino and Nucleo cases.

Compare and contrast ...

[mfgkw]

Are you sure you can send commands like "REG0=..\r\n" directly to the chip?

I assume you have to send something like a command in one byte and some data (like reg number) in another byte and send this via SPI. Maybe on Arduino you used some lib which translates a text command to the format required by the chip?

I found a description at https://www.ti.com/lit/ds/symlink/ads1293.pdf?ts=1776946446158&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252Fde-de%252FADS1293

If it describes your chip I see nothing like your command "REG...=...".

[tejasharma13]

Hey thanks for reply,

You're right....ADS1293 does not accept commands like  "REG...=..." .

It uses SPI with a binary protocol as described in the datasheet. In my implementation, I’m sending register address and data as raw bytes, I’ve written a function that formats the SPI transaction based on the datasheet.

ADS1293_ReadReg(reg) sends reg 0x80, dummy and reads back the value

This matches the SPI communication format specified in the datasheet and also I have used " https://github.com/Protocentral/protocentral-ads1293-arduino " this library for Arduino.

Can you please go through the code text file which I have attached for details....

[Pavel A.]

How about ground? Is the GND connected between the boards?

[tejasharma13]

Yes :)

[Pavel A.]

Great. Get a simple logic analyzer, connect to MOSI and SCK, see if these signals go out on the wires at all. Please don't tell us that you cannot find a simple logic analyzer :)