FreeCalypso > hg > freecalypso-tools
view rvinterf/doc/rvinterf.usage @ 407:19e5a3e2f9c0
fcup-settime: moved time() retrieval a little closer to the output
A fundamental problem with all simple time transfer tools is that there is
always some delay between the time retrieval on the source system and that
transmitted time being set on the destination, and the resulting time
on the destination system is off by that delay amount. This delay cannot
be fully eliminated when working in a simple environment like ours,
but we should make our best effort to minimize it. In the present case,
moving the atinterf_init() call before the time() retrieval should make
a teensy-tiny improvement.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 11 Aug 2018 21:52:17 +0000 |
parents | e7502631a0f9 |
children |
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Rvinterf (the specific program by this name) is an extended version of rvtdump (see rvtdump.usage) that decodes and dumps and/or logs any and all output generated by the firmware running on the target just like rvtdump, but also creates a local UNIX domain socket on the host machine to which "client" programs can connect. "Client" programs connecting to rvinterf via this local socket interface can: 1. Receive copies of selected RVTMUX packets coming from the target; 2. Send arbitrary RVTMUX packets toward the target. Rvinterf is invoked just like rvtdump: rvinterf [options] /dev/ttyXXX The following options have the same meaning as in rvtdump, see rvtdump.usage for the details: -b, -B, -d and -l. The only difference is that -b without -l is potentially useful and thus allowed. Additional rvinterf options which don't exist in rvtdump are: -n Suppress the output on stdout like -b, but don't fork into background. This option is passed by "client" programs when they invoke rvinterf behind the scenes instead of connecting to an already-running rvinterf instance. -s pathname_for_socket By default the local UNIX domain socket created by rvinterf is bound to /tmp/rvinterf_socket; this option allows any other pathname to be specified. -S <file descriptor number> This option is not meant for direct use by human users. It is passed by "client" programs when they invoke rvinterf behind the scenes with an unnamed and unbound socket pair instead of conecting to an already- running rvinterf instance. -w number_in_seconds It has been discovered experimentally that if an RVTMUX packet is sent to a target when the latter is in the "deep sleep" state, the target wakes up, but the packet that was sent is not received correctly. TI's reference fw seems to wait for 10 s after last serial activity before falling into deep sleep (provided that all other conditions for that sleep mode are satisfied), hence the following workaround has been implemented in rvinterf: if a packet is to be sent to the target and more than a set time has elapsed since the last transmitted packet, the packet is preceded by a "wake-up shot" of 64 0 bytes (outside of a packet, ignored by the fw) and a 100 ms pause. This hack is not pretty, but it appears to do its job of making RVTMUX communication with target firmwares reliable. The -w option changes the elapsed time threshold at which the "wake-up shot" is sent; the default is 7 s. Specify -w 0 to disable this hack altogether.