SPI Protocol Analyzer: Large Number of Bytes

[edwardjs]

Hello,

I am using WaveForms to log SPI data from a USB host to SPI master IC (VNC2 from FTDI). I am testing out a card reader but the only card I have that works with the card reader is a gift card that contains around 100 bytes of data. So, the IC is going to send the 100 bytes that it receives from the card reader out over the SPI bus in a single transfer. Is there a way to capture this large of a single transfer with the SPI analyzer? I switched to the fourth configuration in the device manager but I can still only set the bits up to 32. How do I increase the buffer size after choosing the fourth configuration?

[attila]

Hi @edwardjs

If you are using the Logic Analyzer:
- If you are using Digital Discovery you can capture up to 256M samples at up to 800MHz
- With Analog Discovery you could record 100M samples at up to about 1MHz or using compression for burst at higher rate.
With the Protocol tool SPI/Spy you can log data at similar rates.

[ajsb85]

Hi, @attila

I want to buy the Digital Discovery: Portable USB Logic Analyzer and Digital Pattern Generator

This equipment supports SPI master/slave 20MHz?

Thanks in advance.

[attila]

Hi @ajsb85

SPI master and spy/analyzer is supported.

See the following post:

 

[ajsb85]

 

Hi, thanks about the reply.

Yes, it is ok for master and spy/analyzer.

And what's about the speed.

I have a solenoid driver that support 20MHz and an ARM MCU that support 50 and 25 MHz.

Cheers

[attila]

Hi @ajsb85

Rates up to 50MHz are supported but at such frequency it starts to be important the cabling, like shorter, shielded or twisted wires, termination... these to reduce crosstalk and ringing.