It looks to me like you're immediately disabling the UART without
waiting for the data you wrote to get transmitted (which will take a
*LONG* time, at least from the PRU's 5 ns/clk perspective). Try either
not shutting down the UART, or polling the UART to make sure the Tx side
is idle before disabling it.
On 7/18/2017 4:09 PM, [email protected] wrote:
HI,
I'm learning how to use the BBB's PRU's, and I'm writing some assembly to
utilize the PRU's integrated UART. I read through the PRU reference manual and
used it to write my assembly code, but after running the code in a debugger, I'm
getting almost no output. The only reaction from the PRU I could see with my
logic analyzer is a small spike when the PRU writes a value to the UART output
address, but it is not a valid UART communication.
Here's my assembly code
<https://gist.github.com/winter-muted/4e4b113fb5767ea31fdae92f334af46a > and
cape manager overlay
<https://gist.github.com/winter-muted/6aea7bb9d05636a5304c93c202fbbf67>
Any thoughts as to what might be going on?
Thanks!
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Charles Steinkuehler
[email protected]
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