You might want to look at the Winkeyer by Hamcrafters.? This can
take a string of characters from a host system, read them into an
internal buffer, and handle correct output timing.
Gerry Sherman
On 2025-03-31 01:11, Ron, N6YWU via
groups.io wrote:
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If the current source code posted is up-to-date, I don't
think an external keyer will help. ?
?
The pin connected to the key input is being polled within a
GUI process by code in sbitx_gtk.c .
?Normal processes running on a loaded non-real-time Linux
kernel on a single-core Raspberry Pi can have maybe up to 20
milliseconds or more latency when polled without interrupt
handlers or kernel mods. ?This is a bit too long for decent CW
keying at common WPM speeds. ?The key input handling could
perhaps better be done in an interrupt routine, or using
pigpio time-stamps to de-jitter the timing. ?Or possibly with
some real-time kernel modifications to the standard Raspberry
Pi Linux distribution.
?
73, Ron,
N6YWU
