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added an example in the comment

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wybren1971
2021-05-06 14:17:37 +02:00
parent 333f2aba54
commit 20f18755ed
1 changed files with 12 additions and 1 deletions
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13
lib/decoders/fmmfm.cc
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@@ -1,12 +1,18 @@
#include "globals.h" #include "globals.h"
#include "decoders/decoders.h" #include "decoders/decoders.h"
#include "arch/ibm/ibm.h"
#include <iostream> //debug
#include <fstream> //debug
#include "fmt/format.h" //debug
#define HIGH_VALUE 0xFF
Bytes decodeFmMfm( Bytes decodeFmMfm(
std::vector<bool>::const_iterator ii, std::vector<bool>::const_iterator end) std::vector<bool>::const_iterator ii, std::vector<bool>::const_iterator end)
{ {
/* /*
* FM is dumb as rocks, consisting on regular clock pulses with data pulses in * FM is dumb as rocks, consisting on regular clock pulses with data pulses in
* the gaps. 0x00 is: * the gaps. 0x00 is: The basic encoding rule for FM is that all clock bits are 1: zeros are encoded as 10, ones are encoded as 11.
* *
* X-X-X-X-X-X-X-X- * X-X-X-X-X-X-X-X-
* *
@@ -20,6 +26,11 @@ Bytes decodeFmMfm(
* pair can be either 0 or 1... but the second bit is always the data bit, * pair can be either 0 or 1... but the second bit is always the data bit,
* and at this point we simply don't care what the first bit is, so * and at this point we simply don't care what the first bit is, so
* decoding MFM uses just the same code! * decoding MFM uses just the same code!
*
* Data: 0 0 0 1 1 0 1 1 ...
* FM encoded: 10101011111011111...
* MFM clock: ? 1 1 0 0 0 0 0 0...
* FM encoded: ?0101001010001010...
*/ */
Bytes bytes; Bytes bytes;