Communication PYNQ Z2 to PC via USB (UART IP)

[cathalmccabe]

Check the part in my original reply

@cathalmccabe

If you wanted to stream values from a counter; i.e. read a stream of 16 bit values from your counter then you would need some type of DMA to transfer the data back to PS memory. There are some DMA tutorials in the link about, and one that shows you how to do this from HLS without a separate DMA, but again these are more advanced.

https://discuss.pynq.io/t/tutorial-pynq-dma-part-1-hardware-design/3133

Streaming would allow you to keep up with the data and transfer a number of samples. You can transfer a block of data at a time (limited to 8MB).

You need to connect your data source to the AXI stream interface of the DMA. You really need to have VALID and READY handshaking signals to do this. Do you understand the AXI stream interface protocol? If not, you many need to learn about this.

Cathal