mirror of https://github.com/arendst/Tasmota.git
137 lines
4.4 KiB
C++
137 lines
4.4 KiB
C++
/*
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xsns_80_mfrc522.ino - Support for MFRC522 (SPI) NFC Tag Reader on Tasmota
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Copyright (C) 2020 Theo Arends
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_RC522
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/*********************************************************************************************\
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* MFRC522 - 13.56 MHz RFID reader
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\*********************************************************************************************/
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#define XSNS_80 80
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#define USE_RC522_DATA_FUNCTION
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#include <MFRC522.h>
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MFRC522 *Mfrc522;
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struct RC522 {
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bool present = false;
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uint8_t scantimer = 0;
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} Rc522;
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void RC522ScanForTag(void) {
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// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle. And if present, select one.
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if (!Mfrc522->PICC_IsNewCardPresent() || !Mfrc522->PICC_ReadCardSerial()) { return; }
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MFRC522::PICC_Type piccType = Mfrc522->PICC_GetType(Mfrc522->uid.sak);
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AddLog_P(LOG_LEVEL_DEBUG, PSTR("MFR: Type %s"), Mfrc522->PICC_GetTypeName(piccType));
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char uids[21]; // Number of bytes in the UID. 4, 7 or 10
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ToHex_P((unsigned char*)Mfrc522->uid.uidByte, Mfrc522->uid.size, uids, sizeof(uids));
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#ifdef USE_RC522_DATA_FUNCTION
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bool didit = false;
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if ( piccType == MFRC522::PICC_TYPE_MIFARE_MINI
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|| piccType == MFRC522::PICC_TYPE_MIFARE_1K
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|| piccType == MFRC522::PICC_TYPE_MIFARE_4K) {
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uint8_t trailerBlock = 7;
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MFRC522::MIFARE_Key key;
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for (uint32_t i = 0; i < 6; i++) {
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key.keyByte[i] = 0xFF;
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}
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MFRC522::StatusCode status = Mfrc522->PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(Mfrc522->uid));
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if (status == MFRC522::STATUS_OK) {
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uint8_t buffer[18]; // The buffer must be at least 18 bytes because a CRC_A is also returned
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uint8_t size = sizeof(buffer);
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status = (MFRC522::StatusCode) Mfrc522->MIFARE_Read(1, buffer, &size);
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if (status == MFRC522::STATUS_OK) {
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char card_datas[34];
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for (uint32_t i = 0; i < size -2; i++) {
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if ((isalpha(buffer[i])) || ((isdigit(buffer[i])))) {
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card_datas[i] = char(buffer[i]);
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} else {
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card_datas[i] = '\0';
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}
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}
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didit = true;
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ResponseTime_P(PSTR(",\"MFRC522\":{\"UID\":\"%s\",\"" D_JSON_DATA "\":\"%s\"}}"), uids, card_datas);
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}
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}
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}
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if (!didit) {
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ResponseTime_P(PSTR(",\"MFRC522\":{\"UID\":\"%s\"}}"), uids);
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}
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#else
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ResponseTime_P(PSTR(",\"MFRC522\":{\"UID\":\"%s\"}}"), uids);
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#endif
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MqttPublishTeleSensor();
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// Halt PICC
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Mfrc522->PICC_HaltA();
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Rc522.scantimer = 7; // Ignore tags found for two seconds
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}
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void RC522Init(void) {
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if (PinUsed(GPIO_SPI_CS) && PinUsed(GPIO_RC522_RST)) {
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Mfrc522 = new MFRC522(Pin(GPIO_SPI_CS), Pin(GPIO_RC522_RST));
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SPI.begin();
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Mfrc522->PCD_Init();
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if (Mfrc522->PCD_PerformSelfTest()) {
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uint8_t v = Mfrc522->PCD_ReadRegister(Mfrc522->VersionReg);
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char ver[8] = { 0 };
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switch (v) {
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case 0x92: strcpy_P(ver, PSTR("v2.0")); break;
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case 0x91: strcpy_P(ver, PSTR("v1.0")); break;
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case 0x88: strcpy_P(ver, PSTR("clone")); break;
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case 0x00: case 0xFF: strcpy_P(ver, PSTR("fail")); break;
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}
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AddLog_P(LOG_LEVEL_INFO, PSTR("MFR: MFRC522 Rfid reader %s"), ver);
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Rc522.present = true;
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns80(uint8_t function)
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{
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bool result = false;
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if (FUNC_INIT == function) {
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RC522Init();
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}
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else if (Rc522.present) {
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switch (function) {
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case FUNC_EVERY_250_MSECOND:
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if (Rc522.scantimer) {
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Rc522.scantimer--;
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} else {
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RC522ScanForTag();
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}
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break;
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}
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}
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return result;
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}
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#endif // USE_RC522
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