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29ea5bbf
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henryk
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/* ISO14443A Manchester encoder for OpenPICC
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* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
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202b56a4
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henryk
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* (C) 2007 by Henryk Plötz <henryk@ploetzli.ch>
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29ea5bbf
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henryk
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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* Definitions for 106kBps, at sampling clock 1695kHz
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*
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* bit sample pattern for one bit cycle
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* MSB first LSB first hex LSB first
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* Sequence D 1010101000000000 0000000001010101 0x0055
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* Sequence E 0000000010101010 0101010100000000 0x5500
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16d42d5f
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henryk
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* Sequence F 0000000000000000 0000000000000000 0x0000
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henryk
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*
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* Logic 1 Sequence D
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* Logic 0 Sequence E
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* SOF Sequence D
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* EOF Sequence F
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*
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* 212/424/848kBps: BPSK.
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*
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* SOF: 32 subcarrier clocks + bit '0'
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*
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* SOF: hex LSB first: 0x55555555 55555555 + bit '0'
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*
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* EOF: even parity of last byte (!)
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*
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*/
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#define MANCHESTER_SEQ_D 0x0055
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#define MANCHESTER_SEQ_E 0x5500
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henryk
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#define MANCHESTER_SEQ_F 0x0000
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#include <errno.h>
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#include <string.h>
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#include "openpicc.h"
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16d42d5f
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henryk
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#include "iso14443_layer3a.h"
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#include "iso14443a_manchester.h"
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29ea5bbf
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henryk
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henryk
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enum parity {
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PARITY_NONE, /* Don't add a parity bit */
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ODD_PARITY, EVEN_PARITY, /* Calculate parity */
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PARITY_0, PARITY_1 /* Set fixed parity */
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henryk
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};
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9cde1dd0
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henryk
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static inline void manchester_enc_byte(u_int16_t **s16, const u_int8_t data, const enum parity parity)
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henryk
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{
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int i;
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u_int8_t sum_1 = 0;
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u_int16_t *samples16 = *s16;
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henryk
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/* append 8 sample blobs, one for each bit */
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for (i = 0; i < 8; i++) {
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if (data & (1 << i)) {
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henryk
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*(samples16) = MANCHESTER_SEQ_D;
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henryk
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sum_1++;
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} else {
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16d42d5f
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*(samples16) = MANCHESTER_SEQ_E;
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}
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samples16++;
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}
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if(parity != PARITY_NONE) {
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/* Append parity */
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u_int8_t par=0;
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switch(parity) {
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case PARITY_NONE: break;
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case PARITY_0: par = 0; break;
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case PARITY_1: par = 1; break;
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case ODD_PARITY: par = (sum_1 & 0x1) ? 0 : 1; break;
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case EVEN_PARITY: par = (sum_1 & 0x1) ? 1 : 0; break;
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}
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if (par)
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*(samples16) = MANCHESTER_SEQ_D;
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else
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*(samples16) = MANCHESTER_SEQ_E;
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samples16++;
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}
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*s16 = samples16;
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}
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henryk
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int manchester_encode(u_int8_t *sample_buf, u_int16_t sample_buf_len,
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const iso14443_frame *frame)
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{
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unsigned int i, enc_size;
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u_int16_t *samples16;
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if(frame->type != TYPE_A) return -EINVAL;
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if(frame->parameters.a.format != STANDARD_FRAME) return -EINVAL; /* AC not implemented yet */
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/* One bit data is 16 bit is 2 byte modulation data */
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enc_size = 1 /* SOF */
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+ frame->numbytes * ((frame->parameters.a.parity != NO_PARITY) ? 9 : 8) /* bits per byte */
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+ 1 /* EOF */;
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enc_size = enc_size /* in bits */ * 2 /* bytes modulation data per bit raw data*/;
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henryk
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if (sample_buf_len < enc_size)
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return -EINVAL;
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henryk
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memset(sample_buf, 0, enc_size);
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samples16 = (u_int16_t*)sample_buf;
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/* SOF */
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*(samples16++) = MANCHESTER_SEQ_D;
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if(frame->parameters.a.parity == NO_PARITY)
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for (i = 0; i < frame->numbytes; i++)
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manchester_enc_byte(&samples16, frame->data[i], PARITY_NONE);
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else if(frame->parameters.a.parity == GIVEN_PARITY)
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for (i = 0; i < frame->numbytes; i++)
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manchester_enc_byte(&samples16, frame->data[i],
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(frame->parity[i/8]&(1<<(i%8))) ?PARITY_1:PARITY_0);
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else if(frame->parameters.a.parity == PARITY)
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for (i = 0; i < frame->numbytes; i++)
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manchester_enc_byte(&samples16, frame->data[i], ODD_PARITY);
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henryk
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/* EOF */
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*(samples16++) = MANCHESTER_SEQ_F;
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henryk
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return enc_size;
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}
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henryk
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henryk
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#if 0
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/* Broken? */
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#define BPSK_SPEED_212
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static u_int32_t bpsk_sample_size(u_int8_t frame_bytelen);
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int bpsk_encode(char *sample_buf, u_int16_t sample_buf_len,
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const char *data, u_int8_t data_len)
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{
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/* burst of 32 sub carrier cycles */
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memset(sample_buf, 0x55, 8);
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}
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#endif
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