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serialdata/ref/README@c146d19101a3

serialdata/ref/README

Mon, 09 Nov 2020 23:05:24 +0100

author

David Douard <david.douard@sdf3.org>

date

Mon, 09 Nov 2020 23:05:24 +0100

changeset 49

c146d19101a3

parent 43

c850674a3101

permissions

-rw-r--r--

Refactor HPSerial to get rid of packet collision misbehavior

completely split the key sending code from the irq-based receiveing logic.
When sending keycodes, disable the RxIrq callback and handle send and recv
of bytes synchronously.

The keycode sending routine rus in a dedicated thread.

Sessions of UART capture of the reference HP34970A unit.

In these capture frames:
- RX: FP -> CPU
- TX: CPU -> FP

Example extraction of data:

  sigrok-cli -i startup-no-key -P uart:baudrate=187500:parity=even:rx=RX:tx=TX \
             --channels RX,TX  -A uart=rx-data:tx-data:rx-start

Start-bit: following code is a RX, so generated by the FP.