diff options
Diffstat (limited to 'fw/8b10b.c')
| -rw-r--r-- | fw/8b10b.c | 138 |
1 files changed, 89 insertions, 49 deletions
@@ -1,39 +1,42 @@ +#include <assert.h> +#include <stdio.h> + #include "8b10b.h" -static const struct entry_5b6b map_5b6b[32] = { - {0b100111, 0b011000}, /* D.00 */ - {0b011101, 0b100010}, /* D.01 */ - {0b101101, 0b010010}, /* D.02 */ - {0b110001, 0b110001}, /* D.03 */ - {0b110101, 0b001010}, /* D.04 */ - {0b101001, 0b101001}, /* D.05 */ - {0b011001, 0b011001}, /* D.06 */ - {0b111000, 0b000111}, /* D.07 */ - {0b111001, 0b000110}, /* D.08 */ - {0b100101, 0b100101}, /* D.09 */ - {0b010101, 0b010101}, /* D.10 */ - {0b110100, 0b110100}, /* D.11 */ - {0b001101, 0b001101}, /* D.12 */ - {0b101100, 0b101100}, /* D.13 */ - {0b011100, 0b011100}, /* D.14 */ - {0b010111, 0b101000}, /* D.15 */ - {0b011011, 0b100100}, /* D.16 */ - {0b100011, 0b100011}, /* D.17 */ - {0b010011, 0b010011}, /* D.18 */ - {0b110010, 0b110010}, /* D.19 */ - {0b001011, 0b001011}, /* D.20 */ - {0b101010, 0b101010}, /* D.21 */ - {0b011010, 0b011010}, /* D.22 */ - {0b111010, 0b000101}, /* D.23 */ - {0b110011, 0b001100}, /* D.24 */ - {0b100110, 0b100110}, /* D.25 */ - {0b010110, 0b010110}, /* D.26 */ - {0b110110, 0b001001}, /* D.27 */ - {0b001110, 0b001110}, /* D.28 */ - {0b101110, 0b010001}, /* D.29 */ - {0b011110, 0b100001}, /* D.30 */ - {0b101011, 0b010100} /* D.31 */ +static const struct entry map_5b6b[32] = { + {0b100111, 0b011000, 2}, /* D.00 */ + {0b011101, 0b100010, 2}, /* D.01 */ + {0b101101, 0b010010, 2}, /* D.02 */ + {0b110001, 0b110001, 0}, /* D.03 */ + {0b110101, 0b001010, 2}, /* D.04 */ + {0b101001, 0b101001, 0}, /* D.05 */ + {0b011001, 0b011001, 0}, /* D.06 */ + {0b111000, 0b000111, 0}, /* D.07 */ + {0b111001, 0b000110, 2}, /* D.08 */ + {0b100101, 0b100101, 0}, /* D.09 */ + {0b010101, 0b010101, 0}, /* D.10 */ + {0b110100, 0b110100, 0}, /* D.11 */ + {0b001101, 0b001101, 0}, /* D.12 */ + {0b101100, 0b101100, 0}, /* D.13 */ + {0b011100, 0b011100, 0}, /* D.14 */ + {0b010111, 0b101000, 2}, /* D.15 */ + {0b011011, 0b100100, 2}, /* D.16 */ + {0b100011, 0b100011, 0}, /* D.17 */ + {0b010011, 0b010011, 0}, /* D.18 */ + {0b110010, 0b110010, 0}, /* D.19 */ + {0b001011, 0b001011, 0}, /* D.20 */ + {0b101010, 0b101010, 0}, /* D.21 */ + {0b011010, 0b011010, 0}, /* D.22 */ + {0b111010, 0b000101, 2}, /* D.23 */ + {0b110011, 0b001100, 2}, /* D.24 */ + {0b100110, 0b100110, 0}, /* D.25 */ + {0b010110, 0b010110, 0}, /* D.26 */ + {0b110110, 0b001001, 2}, /* D.27 */ + {0b001110, 0b001110, 0}, /* D.28 */ + {0b101110, 0b010001, 2}, /* D.29 */ + {0b011110, 0b100001, 2}, /* D.30 */ + {0b101011, 0b010100, 2} /* D.31 */ }; static const int8_t map_6b5b[64] = { @@ -87,22 +90,22 @@ static const int8_t map_6b5b[64] = { [0b111010] = 23 /* rd = -1 */ }; -static const struct entry_5b6b K28 = {0b001111, 0b110000}; - -static const struct entry_3b4b map_d_3b4b[7] = { - {0b1011, 0b0100}, /* D.x.0 */ - {0b1001, 0b1001}, /* D.x.1 */ - {0b0101, 0b0101}, /* D.x.2 */ - {0b1100, 0b0011}, /* D.x.3 */ - {0b1101, 0b0010}, /* D.x.4 */ - {0b1010, 0b1010}, /* D.x.5 */ - {0b0110, 0b0110} /* D.x.6 */ +static const struct entry K28 = {0b001111, 0b110000}; + +static const struct entry map_3b4b_d[8] = { + {0b1011, 0b0100, 2}, /* D.x.0 */ + {0b1001, 0b1001, 0}, /* D.x.1 */ + {0b0101, 0b0101, 0}, /* D.x.2 */ + {0b1100, 0b0011, 0}, /* D.x.3 */ + {0b1101, 0b0010, 2}, /* D.x.4 */ + {0b1010, 0b1010, 0}, /* D.x.5 */ + {0b0110, 0b0110, 0}, /* D.x.6 */ + {0b1110, 0b0001, 2} /* D.x.P7 */ }; -static const struct entry_3b4b Dx_P7 = {0b1110, 0b0001}, - Dx_A7 = {0b0111, 0b1000}; +static const struct entry Dx_A7 = {0b0111, 0b1000, 2}; -static const struct entry_3b4b map_3b4b_k[8] = { +static const struct entry map_3b4b_k[8] = { {0b1011, 0b0100}, /* K.x.0 */ {0b0110, 0b1001}, /* K.x.1 */ {0b1010, 0b0101}, /* K.x.2 */ @@ -147,12 +150,12 @@ static const uint16_t k_sym_map[K_CODES_LAST] = { [K30_7] = 0b0111101000 }; -void xfr_8b10b_reset(struct state_8b10b *st) { +void xfr_8b10b_reset(struct state_8b10b_dec *st) { st->rx = 0; st->bit_ctr = 0; /* unsynchronized */ } -int xfr_8b10b_feed_bit(struct state_8b10b *st, int bit) { +int xfr_8b10b_feed_bit(struct state_8b10b_dec *st, int bit) { uint32_t pattern = st->rx = (st->rx<<1 | !!bit) & 0x3ff; uint16_t comma = k_sym_map[K28_1]; if (pattern == comma || pattern == ((~comma)&0x3ff)) { @@ -184,7 +187,44 @@ int xfr_8b10b_feed_bit(struct state_8b10b *st, int bit) { return -DECODING_IN_PROGRESS; } -bool xfr_8b10b_has_sync(struct state_8b10b *st) { +bool xfr_8b10b_has_sync(struct state_8b10b_dec *st) { return st->bit_ctr != 0; } +void xfr_8b10b_encode_reset(struct state_8b10b_enc *st) { + st->rd = -1; +} + +int xfr_8b10b_encode(struct state_8b10b_enc *st, int data) { + if (data < 0) { + if (-data >= sizeof(k_sym_map)/sizeof(k_sym_map[0])) + return -EINVAL; + + return k_sym_map[-data]; + } + + if (data > 255) + return -EINVAL; + + int p5b = data&0x1f, p3b = data>>5; + //fprintf(stderr, "\nrd %d data %x p5b %d p3b %d\n", st->rd, data, p5b, p3b); + + int x5b = (st->rd == -1) ? map_5b6b[p5b].rd_neg : map_5b6b[p5b].rd_pos; + st->rd -= map_5b6b[p5b].disp * st->rd; + //fprintf(stderr, "\nnow: rd %d data %x p5b %d p3b %d\n", st->rd, data, p5b, p3b); + assert(st->rd == -1 || st->rd == 1); + + int x3b = (st->rd == -1) ? map_3b4b_d[p3b].rd_neg : map_3b4b_d[p3b].rd_pos; + if (p3b == 7) { + if ( (st->rd == -1 && (p5b == 17 || p5b == 18 || p5b == 20)) + || (st->rd == 1 && (p5b == 11 || p5b == 13 || p5b == 14))) { + //fprintf(stderr, "A7 override\n"); + x3b = (st->rd == -1) ? Dx_A7.rd_neg : Dx_A7.rd_pos; + } + } + st->rd -= map_3b4b_d[p3b].disp * st->rd; /* D.x.A7 and D.x.P7 both have parity 2 */ + assert(st->rd == -1 || st->rd == 1); + + return x5b<<4 | x3b; +} + |