Messages in this thread | | | From | "jdow" <> | Subject | Re: [PATCH -ac] Panicking in morse code | Date | Thu, 25 Jul 2002 21:52:03 -0700 |
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From: "Daniel Phillips" <phillips@arcor.de>
> On Thursday 25 July 2002 14:51, Bill Davidsen wrote: > > On Fri, 19 Jul 2002, Alan Cox wrote: > > > > > > +static const char * morse[] = { > > > > + ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", /* A-H */ > > > > + "..", ".---.", "-.-", ".-..", "--", "-.", "---", ".--.", /* I-P */ > > > > + "--.-", ".-.", "...", "-", "..-", "...-", ".--", "-..-", /* Q-X */ > > > > + "-.--", "--..", /* Y-Z */ > > > > + "-----", ".----", "..---", "...--", "....-", /* 0-4 */ > > > > + ".....", "-....", "--...", "---..", "----." /* 5-9 */ > > > > > > How about using bitmasks here. Say top five bits being the length, lower > > > 5 bits being 1 for dash 0 for dit ? > > > > ??? If the length is 1..5 I suspect you could use the top two bits and fit > > the whole thing in a byte. But since bytes work well, use the top three > > bits for length without the one bit offset. Still a big win over strings, > > although a LOT harder to get right by eye. > > Please read back through the thread and see how 255 different 7 bit codes > complete with lengths can be packed into 8 bits.
It appears someone is under the misapprehension that Morse characters are all 5 elements or less. "SK" is an example of a six element meta-character, one of a set that needs caring for, "...-.-".
(Gawd I wish I could forget that silly communications mode. <sigh>)
{^_^} W6MKU (Color me a spread-spectrum maven.)
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