ADS1293EVM: ADS1293EVM interface to the MSP430 failure

Hi Daniel,

Thanks for your post!

I haven't been able to find anything on the forum for this specific error.
What operating system are you using?
Can you show the device enumerating in device manager?

This post should help for debug questions; e2e.ti.com/.../2689021

Hello Alexander,

I am using Windows 8.1. Yes, I had some troubles with the drivers but I solved it with disabling driver signature. The board was working properly after that. Then, as I wrote, I was trying to launch the demo with SPI interface to the MSP430. And there is the problem. In IAR everything seems it works, even after debugging there is no error but the ADS1293 is disconnected after that.

Required screens:

In my opinion driver works properly. There is error somewhere in the demo launching or in settings of registers.

Thank you,

Daniel

Hi Daniel,

Thanks for the screenshots. It does look like the EVM is enumerating correctly.

We're not entirely sure how or when these demos were written, but our team has continued to provide them "as-is". We can try to reproduce the issue you are seeing later this week, but in the meantime, my suggestion would be to use the stock EVM GUI and configure the registers and measurements manually as you need to for your evaluation, starting with the device's default settings. If there's anything specific you're looking to test and need assistance, please let us know and we can help with that.

Do all of the applications demos show this kind of error, or just Demo 1? Also, can you confirm that you're using the ADS1293EVM hardware in the default configuration?

Best regards,

Hello,

Yes, I tried all of the demos. I was using hardware in the default configuration as well. 

If you have any other guides or advice to manage SPI connection between ADS1293 and MSP430, I will be grateful.

I have also another question. I am dealing with the single lead ECG on this board. I found that is necessery to add AC coupling in the inputs of RA, LA. It is consists of two capacitors about 1uF. Then I found that is good to add two 10 Mohm resistors. The first one from RA to RLDOUT and the second one from LA to RLDOUT. Is that correct? Do you have any other advice about that?

Thank you,

Daniel

Hi Daniel,

Did you update the driver as shown in section 2.2 of the UG?: www.ti.com/.../snau138b.pdf

Can you provide a schematic showing your SPI connections and single lead ECG signal chain?

Hello Alexander,

I thought I updated it but tomorrow I will make it again for assurement. I have not got a board by myself now.

Regarding my project. I would like to manage a single lead ECG which uses only one channel. Then I would like to get these data through SPI in MSP430 in real time. I have to admit I do not have any schematic about SPI.

Today I was trying single lead ECG with this connection on non-soldering board using classic ECG electrodes:

I also turned off RLD amplifier in the software of ADS1293. But it did not work. There was still a lot of noise so I could not recognize any ECG signal. 

Thank you,

Daniel

Hello Alexander,

I am sorry for being late with the reply. Yes, driver was updated and properly installed.

I tried the demos again and there is still that same problem. So regarding SPI there is no update. 

Thank you for any help with this.

Regards,

Daniel

Hi Daniel,

Can you list your SPI connections/schematic for me?
Is the device functional? After power up does /DRDY toggle? You can probe the pin with an oscilloscope.