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B-Netz: Work on pilot signal generation

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The pilot signal to switch to channel 19 can be:
 * a tone
 * a tone that is turned off (notone)
 * positive amplitude
 * negative amplitude
This commit is contained in:
Andreas Eversberg
2016-10-03 14:46:25 +02:00
committed by Andreas Eversberg
parent e029a6a858
commit b205cfcf03
8 changed files with 55 additions and 27 deletions
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5
src/bnetz/main.c
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@@ -55,11 +55,12 @@ void print_help(const char *arg0)
printf(" Set to 19 in order to make the phone transmit at 100 mW instead of\n");
printf(" full 15 Watts. If supported, the phone uses the channel with low power\n");
printf(" (Kanal kleiner Leistung).\n");
printf(" -P --pilot tone | positive | negative | <file>=<on>:<off>\n");
printf(" -P --pilot tone | notone | positive | negative | <file>=<on>:<off>\n");
printf(" Send a tone, give a signal or write to a file when switching to\n");
printf(" channel 19. (paging the phone).\n");
printf(" 'tone', 'positive', 'negative' is sent on second audio channel.\n");
printf(" 'tone' sends a tone whenever channel 19 is switchted.\n");
printf(" 'tone' sends a tone whenever channel 19 is switched.\n");
printf(" 'notone' sends a tone whenever channel 19 is NOT switched.\n");
printf(" 'positive' sends a positive signal for channel 19, else negative.\n");
printf(" 'negative' sends a negative signal for channel 19, else positive.\n");
printf(" Example: /sys/class/gpio/gpio17/value=1:0 writes a '1' to\n");