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Tasmota/tasmota/xsns_82_wiegand.ino

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/*
xsns_82_wiegand.ino - Support for Wiegand Interface 125kHz NFC Tag Reader for Tasmota
Copyright (C) 2021 Sigurd Leuther and Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_WIEGAND
/*********************************************************************************************\
* Wiegand 24, 26, 32, 34 bit Rfid reader 125 kHz
*
* Wire connections:
* Red Vdc
* Black Gnd
* Green D0
* White D1
* Yellow Buzzer
* Blue Led
* Grey 34-bit if connected to Gnd
*
* MQTT:
* %prefix%/%topic%/SENSOR = {"Time":"2021-01-13T12:30:38","Wiegand":{"UID":"rfid tag"}}
\*********************************************************************************************/
#warning **** Wiegand interface enabled ****
#define XSNS_82 82
#define WIEGAND_BIT_TIMEOUT 25 //time to be wait after last bit detected.
// Use only a randomly generate RFID for testing. using #define will save some space in the final code
// DEV_WIEGAND_TEST_MODE 1 : testing with random rfid without hardware connected, but GPIOs set correctly
// DEV_WIEGAND_TEST_MODE 2 : testing with hardware corretly connected.
#define DEV_WIEGAND_TEST_MODE 0
#ifdef DEV_WIEGAND_TEST_MODE
#if (DEV_WIEGAND_TEST_MODE==0)
#elif (DEV_WIEGAND_TEST_MODE==1)
#warning "Wiegand Interface compiled with 'DEV_WIEGAND_TEST_MODE' 1 (Random RFID)"
#elif (DEV_WIEGAND_TEST_MODE==2)
#warning "Wiegand Interface compiled with 'DEV_WIEGAND_TEST_MODE' 2 (Hardware connected)"
#else
#warning "Wiegand Interface compiled with unknown mode"
#endif
#endif
class Wiegand {
public:
Wiegand(void);
void Init(void);
void ScanForTag(void);
#ifdef USE_WEBSERVER
void Show(void);
#endif
private:
uint64_t HexStringToDec(uint64_t);
uint64_t CheckAndConvertRfid(uint64_t,uint16_t);
char translateEnterEscapeKeyPress(char);
uint8_t CalculateParities(uint64_t, int);
bool WiegandConversion (void);
static void handleD0Interrupt(void);
static void handleD1Interrupt(void);
uint64_t rfid;
uint8_t tagSize;
static volatile uint64_t rfidBuffer;
static volatile uint16_t bitCount;
static volatile uint32_t lastFoundTime;
static volatile uint8_t timeOut;
bool isInit = false;
#if (DEV_WIEGAND_TEST_MODE)==1
uint64_t GetRandomRfid(uint8_t);
#endif
};
Wiegand* oWiegand = new Wiegand();
uint8_t scanDelay;
volatile uint64_t Wiegand::rfidBuffer;
volatile uint16_t Wiegand::bitCount;
volatile uint32_t Wiegand::lastFoundTime;
volatile uint8_t Wiegand::timeOut;
Wiegand::Wiegand() {
rfid = 0;
lastFoundTime = 0;
tagSize = 0;
rfidBuffer = 0;
bitCount = 0 ;
timeOut = 0;
isInit = false;
}
#if (DEV_WIEGAND_TEST_MODE)==1
uint64_t Wiegand::GetRandomRfid(uint8_t tag_size=34) {
// Todo add support for 4 and 8 bit keyboard "tags"
uint64_t result = (uint32_t)HwRandom();
uint8_t parities = 0;
bitCount = tag_size;
timeOut = millis() - WIEGAND_BIT_TIMEOUT;
result = result << 32;
result += HwRandom();
switch (tag_size){
case 24:
result = (result & 0x7FFFFE) >>1;
break;
case 26:
result = (result & 0x1FFFFFE) >>1;
break;
case 32:
result = (result & 0x7FFFFFFE) >>1;
break;
case 34:
result = (result & 0x3FFFFFFFE) >>1;
break;
default:
break;
}
parities = CalculateParities(result, tag_size);
result = (result << 1) | (parities & 0x01); // Set LSB parity
if (parities & 0x80) { // MSB parity is 1
switch (tag_size) {
case 24:
result |= 0x800000;
break;
case 26:
result |= 0x2000000;
break;
case 32:
result |= 0x80000000;
break;
case 34:
result |= 0x400000000;
break;
default:
break;
}
}
return result;
}
#endif
void ICACHE_RAM_ATTR Wiegand::handleD1Interrupt() { // Receive a 1 bit. (D0=high & D1=low)
rfidBuffer = (rfidBuffer << 1) | 1; // Leftshift + 1 bit
bitCount++; // Increment the counter
lastFoundTime = millis(); // Last time bit found
}
void ICACHE_RAM_ATTR Wiegand::handleD0Interrupt() { // Receive a 0 bit. (D0=low & D1=high)
rfidBuffer = rfidBuffer << 1; // Leftshift the 0 bit is now at the end of rfidBuffer
bitCount++; // Increment the counter
lastFoundTime = millis(); // Last time bit found
}
void Wiegand::Init() {
isInit = false;
if (PinUsed(GPIO_WIEGAND_D0) && PinUsed(GPIO_WIEGAND_D1)) { // Only start, if the Wiegang pins are
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: Init()"));
#endif
pinMode(Pin(GPIO_WIEGAND_D0), INPUT_PULLUP);
pinMode(Pin(GPIO_WIEGAND_D1), INPUT_PULLUP);
attachInterrupt(Pin(GPIO_WIEGAND_D0), handleD0Interrupt, FALLING);
attachInterrupt(Pin(GPIO_WIEGAND_D1), handleD1Interrupt, FALLING);
isInit = true; // Helps to run only if correctly setup
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: Testmode")); // For tests without reader attaiched
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: D0:%u"),Pin(GPIO_WIEGAND_D0));
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: D1:%u"),Pin(GPIO_WIEGAND_D1));
#else
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: D0=%u, D1=%u"),Pin(GPIO_WIEGAND_D0), Pin(GPIO_WIEGAND_D1));
#endif
}
#if (DEV_WIEGAND_TEST_MODE)>0
else {
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: no GPIOs."));
}
#endif
}
uint64_t Wiegand::CheckAndConvertRfid(uint64_t rfidIn, uint16_t bitcount) {
uint8_t evenParityBit = 0;
uint8_t oddParityBit = (uint8_t) (rfidIn & 0x1); // Last bit = odd parity
uint8_t calcParity = 0;
switch (bitcount) {
case 24:
evenParityBit = (rfidIn & 0x800000) ? 0x80 : 0;
rfidIn = (rfidIn & 0x7FFFFE) >>1;
break;
case 26:
evenParityBit = (rfidIn & 0x2000000) ? 0x80 : 0;
rfidIn = (rfidIn & 0x1FFFFFE) >>1;
break;
case 32:
evenParityBit = (rfidIn & 0x80000000) ? 0x80 : 0;
rfidIn = (rfidIn & 0x7FFFFFFE) >>1;
break;
case 34:
evenParityBit = (rfidIn & 0x400000000) ? 0x80 : 0;
rfidIn = (rfidIn & 0x3FFFFFFFE) >>1;
break;
default:
break;
}
calcParity = CalculateParities(rfidIn, bitCount); // check result on http://www.ccdesignworks.com/wiegand_calc.htm with raw tag as input
if (calcParity != (evenParityBit | oddParityBit)) { // Paritybit is wrong
rfidIn=0;
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: %llu parity error"), rfidIn);
}
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: even (left) parity: %u "), (evenParityBit>>7));
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: even (calc) parity: %u "), (calcParity & 0x80)>>7);
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: odd (right) parity: %u "), oddParityBit);
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: odd (calc) parity: %u "), (calcParity & 0x01));
#endif
return rfidIn;
}
uint8_t Wiegand::CalculateParities(uint64_t tagWithoutParities, int tag_size=26) {
// tag_size is the size of the final tag including the 2 parity bits
// So length if the tagWithoutParities should be (tag_size-2) !! That will be not profed and
// lead to wrong results if the input value is larger!
// Calculated start parity (even) will be returned as bit 8
// calculated end parity (odd) will be returned as bit 1
uint8_t retValue=0;
tag_size -= 2;
if (tag_size <= 0) { return retValue; } // Prohibit div zero exception and other wrong inputs
uint8_t parity = 1; // Check for odd parity on LSB
for (uint8_t i = 0; i < (tag_size / 2); i++) {
parity ^= (tagWithoutParities & 1);
tagWithoutParities >>= 1;
}
retValue |= parity;
parity = 0; // Check for even parity on MSB
while (tagWithoutParities) {
parity ^= (tagWithoutParities & 1);
tagWithoutParities >>= 1;
}
retValue |= (parity << 7);
return retValue;
}
char Wiegand::translateEnterEscapeKeyPress(char oKeyPressed) {
switch(oKeyPressed) {
case 0x0b: // 11 or * key
return 0x0d; // 13 or ASCII ENTER
case 0x0a: // 10 or # key
return 0x1b; // 27 or ASCII ESCAPE
default:
return oKeyPressed;
}
}
bool Wiegand::WiegandConversion () {
bool bRet = false;
unsigned long nowTick = millis();
// Add a maximum wait time for new bits
unsigned long diffTicks = nowTick - lastFoundTime;
if ((diffTicks > WIEGAND_BIT_TIMEOUT) && (diffTicks >= 5000 )) { // Max. 5 secs between 2 bits comming in
bitCount = 0;
rfidBuffer = 0;
lastFoundTime = nowTick;
return bRet;
}
if (diffTicks > WIEGAND_BIT_TIMEOUT) { // Last bit found is WIEGAND_BIT_TIMEOUT ms ago
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: Raw tag %llu, Bit count %u"), rfidBuffer, bitCount);
#endif
if ((24 == bitCount) || (26 == bitCount) || (32 == bitCount) || (34 == bitCount)) {
// 24, 26, 32, 34-bit Wiegand codes
rfid = CheckAndConvertRfid( rfidBuffer, bitCount);
tagSize = bitCount;
bitCount = 0;
rfidBuffer = 0;
bRet = true;
}
else if (4 == bitCount) {
// 4-bit Wiegand codes for keypads
rfid = (int)translateEnterEscapeKeyPress(rfidBuffer & 0x0000000F);
tagSize = bitCount;
bitCount = 0;
rfidBuffer = 0;
bRet = true;
}
else if (8 == bitCount) {
// 8-bit Wiegand codes for keypads with integrity
// 8-bit Wiegand keyboard data, high nibble is the "NOT" of low nibble
// eg if key 1 pressed, data=E1 in binary 11100001 , high nibble=1110 , low nibble = 0001
char highNibble = (rfidBuffer & 0xf0) >>4;
char lowNibble = (rfidBuffer & 0x0f);
if (lowNibble == (~highNibble & 0x0f)) { // Check if low nibble matches the "NOT" of high nibble.
rfid = (int)translateEnterEscapeKeyPress(lowNibble);
bRet = true;
} else {
lastFoundTime = nowTick;
bRet = false;
}
tagSize = bitCount;
bitCount = 0;
rfidBuffer = 0;
} else {
// Time reached but unknown bitCount, clear and start again
lastFoundTime = nowTick;
bitCount = 0;
rfidBuffer = 0;
bRet = false;
}
} else {
bRet = false; // watching time not finished
}
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: tag out %llu, tag size %u "), rfid, tagSize);
#endif
return bRet;
}
void Wiegand::ScanForTag() {
if (!isInit) { return;}
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: ScanForTag()."));
#if (DEV_WIEGAND_TEST_MODE==1)
switch (millis() %4) {
case 0:
rfidBuffer = GetRandomRfid(24);
break;
case 1:
rfidBuffer = GetRandomRfid(26);
break;
case 2:
rfidBuffer = GetRandomRfid(32);
break;
case 3:
rfidBuffer = GetRandomRfid(34);
break;
default:
rfidBuffer = GetRandomRfid(34);
break;
}
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: raw generated: %lX"), rfidBuffer); // for tests without reader attaiched
#endif
#endif
if (bitCount > 0) {
uint64_t oldTag = rfid;
bool validKey = WiegandConversion();
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: previous tag: %llu"), oldTag);
#endif
// only in case of valid key do action. Issue#10585
if (validKey) {
if (oldTag != rfid) { AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: new= %llu"), rfid); }
else { AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: prev= %llu"), rfid); }
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: bits= %u"), tagSize);
ResponseTime_P(PSTR(",\"Wiegand\":{\"UID\":\"%0llu\"}}"), rfid);
MqttPublishTeleSensor();
}
}
}
#ifdef USE_WEBSERVER
void Wiegand::Show(void) {
if (!isInit) { return; }
WSContentSend_PD(PSTR("{s}Wiegand UID{m}%llu {e}"), rfid);
#if (DEV_WIEGAND_TEST_MODE)>0
AddLog_P(LOG_LEVEL_INFO,PSTR("WIE: Tag: %llu"), rfid);
AddLog_P(LOG_LEVEL_INFO, PSTR("WIE: %u bits"), bitCount);
#endif
}
#endif // USE_WEBSERVER
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns82(byte function) {
bool result = false;
switch (function) {
case FUNC_INIT:
oWiegand->Init();
scanDelay = 1;
break;
case FUNC_EVERY_250_MSECOND: // Some tags need more time, don't try shorter period
#if (DEV_WIEGAND_TEST_MODE)==1
if (scanDelay >= 4) // Give a second because of the log entries to be send.
#else
if (scanDelay >= 2) // Only run every (delay * 250 ms) (every 250ms is too fast for some tags)
#endif
{
oWiegand->ScanForTag();
scanDelay = 1;
} else {
scanDelay++;
}
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
oWiegand->Show();
break;
#endif // USE_WEBSERVER
}
return result;
}
#endif // USE_WIEGAND
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