feat: added RFID code, update BOM

FW/m5stack_audio/src/rfid.cpp

@@ -0,0 +1,82 @@
+#include "rfid.h"
+
+
+/*
+   --------------------------------------------------------------------------------------------------------------------
+   Example sketch/program showing how to read data from a PICC to serial.
+   --------------------------------------------------------------------------------------------------------------------
+   This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
+
+   Example sketch/program showing how to read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID
+   Reader on the Arduino SPI interface.
+
+   When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE
+   then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When
+   you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output
+   will show the ID/UID, type and any data blocks it can read. Note: you may see "Timeout in communication" messages
+   when removing the PICC from reading distance too early.
+
+   @license Released into the public domain.
+
+   Typical pin layout used:
+   -----------------------------------------------------------------------------------------
+               MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
+               Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro   Due/Mega2560
+   Signal      Pin          Pin           Pin       Pin        Pin              Pin
+   -----------------------------------------------------------------------------------------
+   RST/Reset   RST          9             5         D9         RESET/ICSP-5     23         9
+   scl	       CLK	    5		  5 		      3                                     22
+   sda         SC 	    4		  4           2                                     21
+
+*/
+
+constexpr uint8_t RST_PIN = 2;          // Configurable, see typical pin layout above
+
+// The default address of the MFRC522 is 0X3C -- specify it here if you
+// have it configured differently (pull up/down pins on the chip).
+//
+// MFRC522_I2C mfrc522(RST_PIN, 0x28 /*, chipAddr */);  		// Create MFRC522 instance
+
+TwoWire i2cBus = TwoWire(0);
+MFRC522_I2C dev = MFRC522_I2C(RST_PIN, 0x28, i2cBus);
+MFRC522 mfrc522 = MFRC522((MFRC522_BUS_DEVICE)dev);
+
+void initRfid() {
+
+  i2cBus.begin(5, 4, 400000); 
+  mfrc522.PCD_Init();		// Init MFRC522
+  mfrc522.PCD_DumpVersionToSerial();	// Show details of PCD - MFRC522 Card Reader details
+  
+  Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
+}
+
+void handleRfid() {
+  // Look for new cards
+  if ( ! mfrc522.PICC_IsNewCardPresent()) {
+    return; // no card in sight.
+  }
+
+  // Select one of the cards
+  if ( ! mfrc522.PICC_ReadCardSerial()) {
+    Serial.println("Bad read (was card removed too quickly?)");
+    return;
+  };
+  
+  if ( mfrc522.uid.size == 0) {
+    Serial.println("Bad card read (size = 0)");
+    return;
+  }
+
+  char buff[sizeof(mfrc522.uid.uidByte)* 5] = { 0 };
+  for (int i = 0; i < mfrc522.uid.size; i++) {
+    char tag[5]; // 3 digits, dash and \0.
+    snprintf(buff, sizeof(buff), "%s%d", i ? "-" : "", mfrc522.uid.uidByte[i]);
+    strncat(buff, tag, sizeof(tag));
+  };
+  Serial.println("Good scan: ");
+  Serial.println(buff);
+
+  // disengage with the card.
+  //
+  mfrc522.PICC_HaltA();
+}

FW/m5stack_audio/src/rfid.h

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+#pragma once
+
+#include <MFRC522.h>
+
+void initRfid(void);
+void handleRfid(void);