STM32CubeMonitor - validate SPI Rx buffer

[DGran.3]

I am receiving 32bit samples from an external ADC via SPI (DMA) on the STM32U5 (NUCLEO board) at a rate of 51200 samples/sec.

Does the ST-Link v3e provide an interface that should allow me to reliably stream these to my PC for further anlayis/validation?

I've tried using UART over VCP but the error rate was too high.

I've been trying to use STM32CubeMonitor - in direct mode I only managed 18600 samples/sec or 595kbps, and I haven't been able to get snapshot mode working at all.

The v3e debugger is USB HS, correct? I'm just not sure how to actually achieve anywhere close to that speed.

[stephane.legargeant]

Hello

If you need to dump all samples, it would imply 1.6Mbits/s bandwidth.

This is far too much to SWD protocol used by STM32cubeMonitor because the computer is polling the data through ST-Link and it will not be fast enough, even with snapshot.

One option could be to use a serial USB converter supporting very high speed, or putting another board to buffer the data received on UART and send it through USB VCP. But you need also a software to ingest the data, and I think that CubeMonitor will not manage this high flow for a long time.

I would suggest to check if you really need to send all samples : if you could reduce the amount of data by compressing, or sending only some specific values, it would be easier.

Best regards

[victagayun · Accepted solution]

Nowadays, UART speed can go higher than 5Mbps, in your case U5 Nucleo (assuming NUCLEO-U575ZI-Q) can reach 10Mbps. If data are sent as raw binary data, you may need to write your own protocol.