mirror of
https://github.com/RfidResearchGroup/ChameleonMini.git
synced 2026-05-12 11:20:37 -07:00
Federico Cerutti
ebd6ab5842
ISO15693 CRC calculation is slow and it delayed too much transmission of long frames. Some readers marked transmission as unsuccesfull and ignored data. Moving CRC calculation inside the codec allows to start modulating the field while the CRC is not yet ready but, by the time it has to be trasmitted, calculation will be done. This fixes https://github.com/emsec/ChameleonMini/issues/262 In EM4233, there still are issues with Read Multiple command when block locking status is requested for more than 0x1F blocks Implemented a check in ISO15693 codec to avoid out of bound CRC writes.
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/*
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* ISO15693.c
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*
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* Created on: 01-03-2017
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* Author: Phillip Nash
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*
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* TODO:
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* - ISO15693AddressedLegacy should be replaced with ISO15693Addressed and appropriate check
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* should be performed (see TITagitstandard.c) - ceres-c
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*/
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#include "Vicinity.h"
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#include "../Codec/ISO15693.h"
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#include "../Memory.h"
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#include "Crypto1.h"
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#include "../Random.h"
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#include "ISO15693-A.h"
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#define MEM_UID_ADDRESS 0x00
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static enum {
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STATE_READY,
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STATE_SELECTED,
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STATE_QUIET
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} State;
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void VicinityAppInit(void) {
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State = STATE_READY;
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}
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void VicinityAppReset(void) {
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State = STATE_READY;
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}
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void VicinityAppTask(void) {
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}
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void VicinityAppTick(void) {
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}
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uint16_t VicinityAppProcess(uint8_t *FrameBuf, uint16_t FrameBytes) {
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if (FrameBytes >= ISO15693_MIN_FRAME_SIZE) {
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if (ISO15693CheckCRC(FrameBuf, FrameBytes - ISO15693_CRC16_SIZE)) {
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// At this point, we have a valid ISO15693 frame
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uint8_t Command = FrameBuf[1];
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uint16_t ResponseByteCount = ISO15693_APP_NO_RESPONSE;
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uint8_t Uid[8];
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MemoryReadBlock(Uid, MEM_UID_ADDRESS, ActiveConfiguration.UidSize);
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switch (State) {
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case STATE_READY:
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if (Command == ISO15693_CMD_INVENTORY) {
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FrameBuf[0] = 0x00; /* Flags */
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FrameBuf[1] = 0x00; /* DSFID */
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ISO15693CopyUid(&FrameBuf[2], Uid);
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ResponseByteCount = 10;
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} else if (Command == ISO15693_CMD_STAY_QUIET) {
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if (ISO15693AddressedLegacy(FrameBuf, Uid)) {
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State = STATE_QUIET;
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}
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} else if (Command == ISO15693_CMD_GET_SYS_INFO) {
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if (ISO15693AddressedLegacy(FrameBuf, Uid)) {
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FrameBuf[0] = 0; /* Flags */
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FrameBuf[1] = 0; /* InfoFlags */
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ISO15693CopyUid(&FrameBuf[2], Uid);
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ResponseByteCount = 10;
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}
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}
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break;
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case STATE_SELECTED:
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break;
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case STATE_QUIET:
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if (Command == ISO15693_CMD_RESET_TO_READY) {
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MemoryReadBlock(Uid, MEM_UID_ADDRESS, ActiveConfiguration.UidSize);
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if (ISO15693AddressedLegacy(FrameBuf, Uid)) {
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FrameBuf[0] = 0;
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ResponseByteCount = 1;
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State = STATE_READY;
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}
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}
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break;
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default:
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break;
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}
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return ResponseByteCount;
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} else { // Invalid CRC
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return ISO15693_APP_NO_RESPONSE;
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}
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} else { // Min frame size not met
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return ISO15693_APP_NO_RESPONSE;
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}
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}
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void VicinityGetUid(ConfigurationUidType Uid) {
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MemoryReadBlock(&Uid[0], MEM_UID_ADDRESS, ActiveConfiguration.UidSize);
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}
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void VicinitySetUid(ConfigurationUidType Uid) {
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MemoryWriteBlock(Uid, MEM_UID_ADDRESS, ActiveConfiguration.UidSize);
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}
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