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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
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commit 033c4e9a5b
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125
firmware/common/lfsr_random.cpp
View file

@ -21,86 +21,67 @@
#include "lfsr_random.hpp"
static void lfsr_iterate_internal(lfsr_word_t& v)
{
/*
Generated with lfsr-generator:
http://lfsr-generator.sourceforge.net
=============================================
config : fibonacci
length : 31
taps : (31, 18)
shift-amounts : (12, 12, 8)
shift-direction : left
*/
enum {
length = 31,
tap_0 = 31,
tap_1 = 18,
shift_amount_0 = 12,
shift_amount_1 = 12,
shift_amount_2 = 8
};
static void lfsr_iterate_internal(lfsr_word_t& v) {
/*
Generated with lfsr-generator:
http://lfsr-generator.sourceforge.net
=============================================
config : fibonacci
length : 31
taps : (31, 18)
shift-amounts : (12, 12, 8)
shift-direction : left
*/
enum {
length = 31,
tap_0 = 31,
tap_1 = 18,
shift_amount_0 = 12,
shift_amount_1 = 12,
shift_amount_2 = 8
};
const lfsr_word_t zero = 0;
v = (
(
v << shift_amount_0
) | (
(
(v >> (tap_0 - shift_amount_0)) ^
(v >> (tap_1 - shift_amount_0))
) & (
~(~zero << shift_amount_0)
)
)
);
v = (
(
v << shift_amount_1
) | (
(
(v >> (tap_0 - shift_amount_1)) ^
(v >> (tap_1 - shift_amount_1))
) & (
~(~zero << shift_amount_1)
)
)
);
v = (
(
v << shift_amount_2
) | (
(
(v >> (tap_0 - shift_amount_2)) ^
(v >> (tap_1 - shift_amount_2))
) & (
~(~zero << shift_amount_2)
)
)
);
const lfsr_word_t zero = 0;
v = ((
v << shift_amount_0) |
((
(v >> (tap_0 - shift_amount_0)) ^
(v >> (tap_1 - shift_amount_0))) &
(~(~zero << shift_amount_0))));
v = ((
v << shift_amount_1) |
((
(v >> (tap_0 - shift_amount_1)) ^
(v >> (tap_1 - shift_amount_1))) &
(~(~zero << shift_amount_1))));
v = ((
v << shift_amount_2) |
((
(v >> (tap_0 - shift_amount_2)) ^
(v >> (tap_1 - shift_amount_2))) &
(~(~zero << shift_amount_2))));
}
lfsr_word_t lfsr_iterate(lfsr_word_t v) {
lfsr_iterate_internal(v);
return v;
lfsr_iterate_internal(v);
return v;
}
void lfsr_fill(lfsr_word_t& v, lfsr_word_t* buffer, size_t word_count) {
while( word_count != 0 ) {
lfsr_iterate_internal(v);
*(buffer++) = v;
word_count--;
}
while (word_count != 0) {
lfsr_iterate_internal(v);
*(buffer++) = v;
word_count--;
}
}
bool lfsr_compare(lfsr_word_t& v, const lfsr_word_t* buffer, size_t word_count) {
while( word_count != 0 ) {
lfsr_iterate_internal(v);
if( *(buffer++) != v ) {
return false;
}
word_count--;
}
return true;
while (word_count != 0) {
lfsr_iterate_internal(v);
if (*(buffer++) != v) {
return false;
}
word_count--;
}
return true;
}