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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents 5c75d84ffa81
children
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5c75d84ffa81 rvinterf/doc: started documenting the usage of rvinterf tools
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1 Rvinterf (the specific program by this name) is an extended version of rvtdump
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2 (see rvtdump.usage) that decodes and dumps and/or logs any and all output
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3 generated by the firmware running on the target just like rvtdump, but also
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4 creates a local UNIX domain socket on the host machine to which "client"
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5 programs can connect. "Client" programs connecting to rvinterf via this local
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6 socket interface can:
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7
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8 1. Receive copies of selected RVTMUX packets coming from the target;
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9
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10 2. Send arbitrary RVTMUX packets toward the target.
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11
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12 Rvinterf is invoked just like rvtdump:
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14 rvinterf [options] /dev/ttyXXX
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16 The following options have the same meaning as in rvtdump, see rvtdump.usage
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17 for the details: -b, -B, -d and -l. The only difference is that -b without -l
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18 is potentially useful and thus allowed.
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20 Additional rvinterf options which don't exist in rvtdump are:
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21
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22 -n
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23
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24 Suppress the output on stdout like -b, but don't fork into background.
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25 This option is passed by "client" programs when they invoke rvinterf
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26 behind the scenes instead of connecting to an already-running rvinterf
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27 instance.
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29 -s pathname_for_socket
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31 By default the local UNIX domain socket created by rvinterf is bound to
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32 /tmp/rvinterf_socket; this option allows any other pathname to be
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33 specified.
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34
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35 -S <file descriptor number>
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36
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37 This option is not meant for direct use by human users. It is passed
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38 by "client" programs when they invoke rvinterf behind the scenes with
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39 an unnamed and unbound socket pair instead of conecting to an already-
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40 running rvinterf instance.
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41
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42 -w number_in_seconds
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43
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44 It has been discovered experimentally that if an RVTMUX packet is sent
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45 to a target when the latter is in the "deep sleep" state, the target
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46 wakes up, but the packet that was sent is not received correctly. TI's
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47 reference fw seems to wait for 10 s after last serial activity before
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48 falling into deep sleep (provided that all other conditions for that
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49 sleep mode are satisfied), hence the following workaround has been
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50 implemented in rvinterf: if a packet is to be sent to the target and
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51 more than a set time has elapsed since the last transmitted packet, the
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52 packet is preceded by a "wake-up shot" of 64 0 bytes (outside of a
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53 packet, ignored by the fw) and a 100 ms pause. This hack is not pretty,
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54 but it appears to do its job of making RVTMUX communication with target
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55 firmwares reliable.
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56
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57 The -w option changes the elapsed time threshold at which the "wake-up
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58 shot" is sent; the default is 7 s. Specify -w 0 to disable this hack
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59 altogether.