XCore Exchange

Hello:

If p_in is an input buffered port, does a "p_in :> x;" statement inside a while(1) loop block the loop execution until the next time the buffered port is full?

If not, what happens each time the statement is encountered?

Thanks,
Bill

https://www.xmos.com/published/xc-port-buffering

Thanks for the response. Reading the linked material prompted another question.

The summary states that "An input removes data from a port’s FIFO. The processor waits only if the FIFO is empty." What happens if I use a buffered port that is larger than the size of the input pin specification, for example "in buffered port :32 p_in = XS1_PORT_8A ;"?

Can the "p_in :> x;" statement pull partial data from the FIFO in a non-blocking manner, or will the processor wait until all 4 8-bit portions are in the FIFO?

Thanks,
Bill

There's the partin, partout and some related library functions to do that.

https://www.xmos.com/download/private/I ... 283%29.pdf

Should be valid too for XS2.

Thanks for the further references. I'm wondering, what is the default value? That is, what happens if I use a buffered port that is larger than the size of the input pin specification, for example "in buffered port :32 p_in = XS1_PORT_8A ;"? Will "p_in :> x;" block or pull out partial results or something else?

What should I do if I want the "p_in :> x;" statement to wait until the FIFO is full?

By default the full buffer width is used

Does that mean that for "in buffered port :32 p_in = XS1_PORT_8A ;" the default mode for "p_in :> x;" is to block?

Yes it will block until 32 bits have been clocked in.

Thanks for the help!

sincerely,
Bill