mirror of https://github.com/arendst/Tasmota.git
138 lines
4.4 KiB
C++
138 lines
4.4 KiB
C++
/**
|
|
* ----------------------------------------------------------------------------
|
|
* This is a MFRC522 library example; see https://github.com/miguelbalboa/rfid
|
|
* for further details and other examples.
|
|
*
|
|
* NOTE: The library file MFRC522.h has a lot of useful info. Please read it.
|
|
*
|
|
* Released into the public domain.
|
|
* ----------------------------------------------------------------------------
|
|
* Minimal example how to use the interrupts to read the UID of a MIFARE Classic PICC
|
|
* (= card/tag).
|
|
*
|
|
*
|
|
* Typical pin layout used:
|
|
* -----------------------------------------------------------------------------------------
|
|
* MFRC522 Arduino Arduino Arduino Arduino Arduino
|
|
* Reader/PCD Uno/101 Mega Nano v3 Leonardo/Micro Pro Micro
|
|
* Signal Pin Pin Pin Pin Pin Pin
|
|
* -----------------------------------------------------------------------------------------
|
|
* RST/Reset RST 9 5 D9 RESET/ICSP-5 RST
|
|
* SPI SS SDA(SS) 10 53 D10 3 10
|
|
* IRQ ? ? ? ? 2 10
|
|
* SPI MOSI MOSI 11 / ICSP-4 51 D11 ICSP-4 16
|
|
* SPI MISO MISO 12 / ICSP-1 50 D12 ICSP-1 14
|
|
* SPI SCK SCK 13 / ICSP-3 52 D13 ICSP-3 15
|
|
*
|
|
*/
|
|
|
|
#include <SPI.h>
|
|
#include <MFRC522.h>
|
|
|
|
#define RST_PIN 9 // Configurable, see typical pin layout above
|
|
#define SS_PIN 3 // Configurable, see typical pin layout above
|
|
#define IRQ_PIN 2 // Configurable, depends on hardware
|
|
|
|
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
|
|
|
|
MFRC522::MIFARE_Key key;
|
|
|
|
volatile bool bNewInt = false;
|
|
byte regVal = 0x7F;
|
|
void activateRec(MFRC522 mfrc522);
|
|
void clearInt(MFRC522 mfrc522);
|
|
|
|
/**
|
|
* Initialize.
|
|
*/
|
|
void setup() {
|
|
Serial.begin(115200); // Initialize serial communications with the PC
|
|
while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
|
|
SPI.begin(); // Init SPI bus
|
|
|
|
mfrc522.PCD_Init(); // Init MFRC522 card
|
|
|
|
/* read and printout the MFRC522 version (valid values 0x91 & 0x92)*/
|
|
Serial.print(F("Ver: 0x"));
|
|
byte readReg = mfrc522.PCD_ReadRegister(mfrc522.VersionReg);
|
|
Serial.println(readReg, HEX);
|
|
|
|
/* setup the IRQ pin*/
|
|
pinMode(IRQ_PIN, INPUT_PULLUP);
|
|
|
|
/*
|
|
* Allow the ... irq to be propagated to the IRQ pin
|
|
* For test purposes propagate the IdleIrq and loAlert
|
|
*/
|
|
regVal = 0xA0; //rx irq
|
|
mfrc522.PCD_WriteRegister(mfrc522.ComIEnReg, regVal);
|
|
|
|
bNewInt = false; //interrupt flag
|
|
|
|
/*Activate the interrupt*/
|
|
attachInterrupt(digitalPinToInterrupt(IRQ_PIN), readCard, FALLING);
|
|
|
|
do { //clear a spourious interrupt at start
|
|
;
|
|
} while (!bNewInt);
|
|
bNewInt = false;
|
|
|
|
Serial.println(F("End setup"));
|
|
}
|
|
|
|
/**
|
|
* Main loop.
|
|
*/
|
|
void loop() {
|
|
if (bNewInt) { //new read interrupt
|
|
Serial.print(F("Interrupt. "));
|
|
mfrc522.PICC_ReadCardSerial(); //read the tag data
|
|
// Show some details of the PICC (that is: the tag/card)
|
|
Serial.print(F("Card UID:"));
|
|
dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
|
|
Serial.println();
|
|
|
|
clearInt(mfrc522);
|
|
mfrc522.PICC_HaltA();
|
|
bNewInt = false;
|
|
}
|
|
|
|
// The receiving block needs regular retriggering (tell the tag it should transmit??)
|
|
// (mfrc522.PCD_WriteRegister(mfrc522.FIFODataReg,mfrc522.PICC_CMD_REQA);)
|
|
activateRec(mfrc522);
|
|
delay(100);
|
|
} //loop()
|
|
|
|
/**
|
|
* Helper routine to dump a byte array as hex values to Serial.
|
|
*/
|
|
void dump_byte_array(byte *buffer, byte bufferSize) {
|
|
for (byte i = 0; i < bufferSize; i++) {
|
|
Serial.print(buffer[i] < 0x10 ? " 0" : " ");
|
|
Serial.print(buffer[i], HEX);
|
|
}
|
|
}
|
|
/**
|
|
* MFRC522 interrupt serving routine
|
|
*/
|
|
void readCard() {
|
|
bNewInt = true;
|
|
}
|
|
|
|
/*
|
|
* The function sending to the MFRC522 the needed commands to activate the reception
|
|
*/
|
|
void activateRec(MFRC522 mfrc522) {
|
|
mfrc522.PCD_WriteRegister(mfrc522.FIFODataReg, mfrc522.PICC_CMD_REQA);
|
|
mfrc522.PCD_WriteRegister(mfrc522.CommandReg, mfrc522.PCD_Transceive);
|
|
mfrc522.PCD_WriteRegister(mfrc522.BitFramingReg, 0x87);
|
|
}
|
|
|
|
/*
|
|
* The function to clear the pending interrupt bits after interrupt serving routine
|
|
*/
|
|
void clearInt(MFRC522 mfrc522) {
|
|
mfrc522.PCD_WriteRegister(mfrc522.ComIrqReg, 0x7F);
|
|
}
|
|
|