kopia lustrzana https://github.com/F5OEO/rpitx
43 wiersze
1.5 KiB
Markdown
43 wiersze
1.5 KiB
Markdown
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# SendOOK
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`sendook` allow you to send On Off Keying packend with librpitx.
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## Usage
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Run the program in SUDO, even if using the "dry run" switch. It is because of the DMA things of librpitx.
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```
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usage : sendook [options] "binary code"
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Options:
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-h : this help
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-v : verbose (-vv : more verbose)
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-d : dry run : do not send anything
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-f freq : frequency in Hz (default : 433.92MHz)
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-0 nb : duration in microsecond of 0 bit (by default : 500us). Use integer only.
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-1 nb : duration in microsecond of 1 bit (by default : 250us)
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-r nb : repeat nb times the message (default : 3)
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-p nb : pause between each message (default : 1000us=1ms)
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"binary code":
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a serie of 0 or 1 char (space allowed and ignored)
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Examples:
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sendook -f 868.3M -0 500 -1 250 -r 3 1010101001010101
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send 0xaa55 three times (with the default pause of 1ms) on 868.3MHz. A 0 is a gap of 500us, a 1 is a pulse of 250us
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```
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The program return 0 if message send.
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### Known limitation
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- a gap or a pulse can not be shorter than 10us (options `-0` or `-1`).
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- the pulse is not really a pulse : it is not modulated (you cant have a pulse of 7Khz for ex.)
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- but the signal is not really a square signal too, because librpitx, for an unkown reason, modulate the generated signal globally :
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-- for example, the command `sendook -f 868.3M -0 500 -1 250 -r 3 101010` should generate :
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```
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| .... .... ....
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| : : : : : :
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+-+--+----+--+----+--+----------------------->
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```
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-- but if record the I/Q of the signal, you will see :
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