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Multiple port serial driver - Page 2 — Parallax Forums

Multiple port serial driver

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  • Cluso99Cluso99 Posts: 18,066
    excellent feedback Jason. Pleased you have it working :)
  • Here's another pass through the code for the no-flow version 2.1.
    -- inverted mode is now handled in the pasm rather than in spin. (faster)
    -- open/inverted mode now works correctly and needs a pulldown to Vss, which is the stop bit state. (This rarely used mode was messed up, never noticed before.)
    -- correct stop bit state is determined by code patch rather than by run-time mode test.
    -- spin methods tx() and packet() now correctly inhibit adding data to a tx buffer that has not been opened. (Otherwise adding data to a closed buffer can lock up a program execution while waiting for space in the tx buffer.)
    -- Now allows opening a single port for tx or rx, only one coroutine enabled.
    (This is needed due to elimination of unused coroutines. A coroutine cannot jmpret to itself, which amounts to modifying an instruction and executing it immediately without a buffer instruction in-between. Now if only a single port rx or tx is enabled, a bridging jmpret is added in the flow)
    -- cleaned up comments.

    Also a demo that is set up as a loopback, to send chars from a terminal through all 4 port and back to the terminal. The ports can be set up to use different modes.



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