RFID

README.md

@@ -27,6 +27,64 @@ CLK -> 18 (D5)
 MISO -> 19 (D6)
 ```
 
+### RFID Reader
+
+```
+
+```
+
+#### Registers
+
+```
+Writing 0x7F to the "ComIEnReg" means the following:
+
+    Bit 7: IRqInv=0 - Interrupts are active high
+    Bit 6: TxIEn=1 - Transmitter interrupt is enabled
+    Bit 5: RxIEn=1 - Receive interrupt is enabled
+    Bit 4: IdleIEn=1 - Idle interrupt is enabled
+    Bit 3: HiAlertIEn=1 - "High Alert" interrupt is enabled
+    Bit 2: LoAlertIEn=1 - "Low Alert" interrupt is enabled
+    Bit 1: ErrIEn=1 - Error interrupt is enabled
+    Bit 0: TimerIEn=1 - Timer interrupt is enabled
+
+The bits in the register "ComIrqReg" have the following meaning:
+
+    Bit 7: Set1 - when written as 1, a bit value of 1 in bits 6-0 of the byte written set the corresponding register bit; when written as 0, bits 6-0 clear the corresponding register bit
+    Bit 6: TxIRq - Set when the last bit of Tx data has been sent
+    Bit 5: RxIRq - Set when the receiver detects the end of a valid data stream
+    Bit 4: IdleIRq - Set when the CommandReg changes the command field to the idle command
+    Bit 3: HiAlertIRq - Set when the Status1 register HiAlert bit is set
+    Bit 2: LoAlertIRq - Set when the Status1 register LoAlert bit is set
+    Bit 1: ErrIRq - Set when any bit in ErrorReg gets set
+    Bit 0: TimerIRq - Set when the TCounterValReg decrements to zero
+
+Writing 0x14 to the "DivIEnReg" has the following meaning:
+
+    Bit 7: IRQPushPull=0 - IRQ is an open-drain output pin
+    Bit 6: reserved=0 - no known effect
+    Bit 5: reserved=0 - effect unknown
+    Bit 4: MfinActEn=1 - Allow the MFIN active interrupt request to trigger IRQ
+    Bit 3: reserved=0 - boundedly undefined
+    Bit 2: CRCIEn=1 - Permit the "DivIrqReg" bit CRCIRq to trigger IRQ
+    Bit 1: reserved=0 - do not set to 1 on pain of nothing
+    Bit 0: reserved=0 - has no purpose other than to confuse
+
+The register "DivIrqReg" corresponds to "DivIrqEn", and has the following bit definitions:
+
+    Bit 7: Set2 - when written as 1, a bit value of 1 in bits 6-0 of the byte written set the corresponding register bit; when written as 0, bits 6-0 clear the corresponding register bit
+    Bit 6: reserved - don't ask
+    Bit 5: reserved - don't tell
+    Bit 4: MfinActIRq - MFIN is active
+    Bit 3: reserved - just leave it at zero and back away slowly
+    Bit 2: CRCIRq - when 1, the CalcCRC command is active and all data is processed
+    Bit 1: reserved - nothing to see here
+    Bit 0: reserved - are you feeling lucky, punk?
+```
+Interrupt method was not working because it seems reading a card does not trigger one.
+
+See https://arduino.stackexchange.com/a/76285 and https://github.com/miguelbalboa/rfid/blob/master/examples/MinimalInterrupt/MinimalInterrupt.ino
+
+
 ## Buttons
 
 ```

src/globals.h

@@ -5,11 +5,31 @@ void stop();
 
 void start();
 
+void loop2(void* parameter);
+
 boolean buttonPressed(const uint8_t pin);
 
+/**
+ * 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);
+    }
+}
+
+String getRFIDString(byte uidByte[10])
+{
+    String uidString = String(uidByte[0]) + " " + String(uidByte[1]) + " " +
+                       String(uidByte[2]) + " " + String(uidByte[3]);
+    return uidString;
+}
+
 unsigned long lastStart = 0;
 
 const int startDelay = 250;
 
-
 #endif

src/helper.h

@@ -1,95 +0,0 @@
-#ifndef HELPER_H_
-#define HELPER_H_
-
-#include <SD.h>
-#include "globals.h"
-
-
-struct DirectoryNode {
-  String name;
-  std::vector<DirectoryNode*> subdirectories;
-  std::vector<String> mp3Files;
-  String* currentPlaying;
-};
-
-
-
-
-
-void buildDirectoryTree(DirectoryNode* currentNode, const char* currentPath) {
-  File root = SD.open(currentPath);
-  while (true) {
-    File entry = root.openNextFile();
-    if (!entry) {
-      break;
-    }
-    if (entry.isDirectory()) {
-      DirectoryNode* newNode = new DirectoryNode;
-      newNode->name = String(currentPath) + entry.name();
-      currentNode->subdirectories.push_back(newNode);
-      buildDirectoryTree(newNode, (String(currentPath) + entry.name()).c_str());
-    } else if (String(entry.name()).endsWith(".mp3")) {
-      currentNode->mp3Files.push_back(entry.name());
-    }
-    entry.close();
-  }
-  root.close();
-}
-
-void printDirectoryTree(DirectoryNode* currentNode, int level = 0) {
-  for (int i = 0; i < level; i++) {
-    Serial.print("  ");
-  }
-  Serial.println(currentNode->name);
-  
-  for (const String& mp3File : currentNode->mp3Files) {
-    for (int i = 0; i <= level; i++) {
-      Serial.print("  ");
-    }
-    Serial.println(mp3File);
-  }
-  
-  for (DirectoryNode* childNode : currentNode->subdirectories) {
-    printDirectoryTree(childNode, level + 1);
-  }
-}
-
-void advanceToNextMP3(DirectoryNode* currentNode) {
-  if (currentNode->currentPlaying != nullptr) {
-    for (size_t i = 0; i < currentNode->mp3Files.size(); i++) {
-      if (*currentNode->currentPlaying == currentNode->mp3Files[i]) {
-        // Found the current playing MP3 file
-        if (i < currentNode->mp3Files.size() - 1) {
-          // Advance to the next MP3 file in the same directory
-          currentNode->currentPlaying = &currentNode->mp3Files[i + 1];
-          return;
-        }
-        // Reached the end of the MP3 files in the directory
-        break;
-      }
-    }
-  }
-  // If not playing or reached the end, set the first MP3 file as the current playing
-  if (!currentNode->mp3Files.empty()) {
-    currentNode->currentPlaying = &currentNode->mp3Files[0];
-  }
-}
-
-DirectoryNode* findFirstMP3Node(DirectoryNode* currentNode) {
-  if (!currentNode->mp3Files.empty()) {
-    return currentNode;
-  }
-
-  for (DirectoryNode* subdirectory : currentNode->subdirectories) {
-    DirectoryNode* tempNode = findFirstMP3Node(subdirectory);
-    if (!tempNode->mp3Files.empty()) {
-      return tempNode;
-    }
-  }
-
-  return NULL;
-}
-
-
-
-#endif /* HELPER_H_ */

src/main.cpp

@@ -9,15 +9,12 @@
 
 #include "Audio.h"
 
-
-
-
 #include <SPI.h>
 #include <SD.h>
-#include <MFRC522.h>//RFID Reader
+#include <MFRC522.h> //RFID Reader
 
 // define pins for RFID
-#define CS_RFID 32// SIC, tried 4 and 32 but only this worked!
+#define CS_RFID 32 // SIC, tried 4 and 32 but only this worked!
 #define RST_RFID 33
 #define IRQ_RFID 34
 
@@ -30,20 +27,20 @@
 
 #define CS_SDCARD 22
 
+#define RFID_LOOP_INTERVAL 10
 
 #include "globals.h"
 #include "WebContent.h"
 #include "DirectoryNode.h"
 
-
 File root;
 File mp3File;
 
-
-
 Audio audio;
 
-uint volume = 18;
+uint volume = 12;
+
+uint rfid_loop = RFID_LOOP_INTERVAL;
 
 AsyncWebServer server(80);
 DNSServer dns;
@@ -55,23 +52,27 @@ boolean blockState = false;
 
 volatile bool newRfidInt = false;
 
+MFRC522 rfid(CS_RFID, RST_RFID); // instatiate a MFRC522 reader object.
 
-MFRC522 rfid(CS_RFID, RST_RFID);  // instatiate a MFRC522 reader object.
+TaskHandle_t RfidTask;
 
-
-void activateSD() {
+void activateSD()
+{
   digitalWrite(CS_SDCARD, LOW);
 }
 
-void deactivateSD() {
+void deactivateSD()
+{
   digitalWrite(CS_SDCARD, HIGH);
 }
 
-void activateRFID() {
+void activateRFID()
+{
   digitalWrite(CS_RFID, LOW);
 }
 
-void deactivateRFID() {
+void deactivateRFID()
+{
   digitalWrite(CS_RFID, HIGH);
 }
 
@@ -95,8 +96,10 @@ void playNextMp3()
   String mp3File = currentNode->getCurrentPlayingFilePath();
   Serial.println(mp3File.c_str());
   deactivateRFID();
+  activateSD();
   audio.connecttoSD(mp3File.c_str());
   activateRFID();
+  deactivateSD();
   blockState = false;
 }
 
@@ -105,15 +108,18 @@ void audio_info(const char *info)
   // Serial.print("info        "); Serial.println(info);
 }
 
-void mute() {
-  if (audio.getVolume()!=0) {
+void mute()
+{
+  if (audio.getVolume() != 0)
+  {
     volume = audio.getVolume();
   }
-  
+
   audio.setVolume(0);
 }
 
-void unmute() {
+void unmute()
+{
   audio.setVolume(volume);
 }
 
@@ -121,7 +127,8 @@ String getState()
 {
   String state = String();
 
-  if (blockState) {
+  if (blockState)
+  {
     return state;
   }
   blockState = true;
@@ -133,7 +140,6 @@ String getState()
     state += " / ";
     state += audio.getAudioFileDuration();
     state += " ";
-
   }
   else
   {
@@ -172,40 +178,40 @@ void stop()
 
 void start()
 {
-  if (currentNode!=NULL) {
+  if (currentNode != NULL)
+  {
     currentNode->setCurrentPlaying(NULL);
     currentNode = NULL;
   }
-  
+
   playNextMp3();
 }
 
 void next()
-{ 
+{
   playNextMp3();
 }
 
-void audio_eof_mp3(const char *info) {
+void audio_eof_mp3(const char *info)
+{
   Serial.println("audio file ended.");
   playNextMp3();
 }
 
-void readRFID() {
+/* not working, FIXME remove me! */
+void IRAM_ATTR rfid_interrupt()
+{
+  newRfidInt = true;
+}
+
+void readRFID()
+{
   rfid.PICC_ReadCardSerial();
   Serial.print("Tag UID: ");
-  String uidString = String(rfid.uid.uidByte[0]) + " " + String(rfid.uid.uidByte[1]) + " " + 
-    String(rfid.uid.uidByte[2]) + " " + String(rfid.uid.uidByte[3]);
+  String uidString = getRFIDString(rfid.uid.uidByte);
   Serial.println(uidString);
 }
 
-void clearInt(MFRC522 mfrc522) {
-  mfrc522.PCD_WriteRegister(mfrc522.ComIrqReg, 0x7F);
-}
-
-void IRAM_ATTR rfid_interrupt() {
-  newRfidInt = true;
-}
-
 void setup()
 {
   // put your setup code here, to run once:
@@ -213,24 +219,20 @@ void setup()
 
   pinMode(BTN_START_STOP, INPUT_PULLUP);
 
-/* setup the IRQ pin*/
+  /* setup the IRQ pin*/
   pinMode(IRQ_RFID, INPUT_PULLUP);
 
-  pinMode(CS_RFID,OUTPUT);
-  pinMode(CS_SDCARD,OUTPUT);
-
+  pinMode(CS_RFID, OUTPUT);
+  pinMode(CS_SDCARD, OUTPUT);
 
   deactivateRFID();
-
-
+  activateSD();
 
   // first parameter is name of access point, second is the password
   AsyncWiFiManager wifiManager(&server, &dns);
 
   wifiManager.autoConnect("HannaBox");
 
-
-
   Serial.print("Initializing SD card...");
 
   if (!SD.begin(CS_SDCARD))
@@ -244,30 +246,21 @@ void setup()
   rootNode.buildDirectoryTree("/");
   rootNode.printDirectoryTree();
 
-
   deactivateSD();
   activateRFID();
   Serial.println("RFID");
 
-    // Init MFRC522 
-    // Init SPI bus
-  SPI.begin(-1,-1,-1,CS_RFID);
+  // Init MFRC522
+  // Init SPI bus
+  SPI.begin(-1, -1, -1, CS_RFID);
   rfid.PCD_Init(CS_RFID, RST_RFID);
-  if (rfid.PCD_PerformSelfTest()) {
-    Serial.println("RFID OK");
-    
-       /*
-      * Allow the ... irq to be propagated to the IRQ pin
-      * For test purposes propagate the IdleIrq and loAlert
-      */
-      //rfid.PCD_WriteRegister(rfid.ComIEnReg, 0xA0);
-      attachInterrupt(IRQ_RFID, rfid_interrupt, FALLING);
 
-      do { //clear a spourious interrupt at start
-        ;
-      } while (!newRfidInt);
-      newRfidInt = false; //interrupt flag
-  } else {
+  if (rfid.PCD_PerformSelfTest())
+  {
+    Serial.println("RFID OK");
+  }
+  else
+  {
     Serial.println("RFID Self Test failed!");
   }
 
@@ -276,7 +269,6 @@ void setup()
 
   Serial.println("Audio initialized.");
 
-
   server.on("/", HTTP_GET, [](AsyncWebServerRequest *request)
             { request->send_P(200, "text/html", index_html, processor); });
 
@@ -304,55 +296,75 @@ void setup()
                   next(); });
 
   server.begin();
+
+  xTaskCreatePinnedToCore(
+      loop2,      /* Function to implement the task */
+      "RFIDTask", /* Name of the task */
+      10000,      /* Stack size in words */
+      NULL,       /* Task input parameter */
+      0,          /* Priority of the task */
+      &RfidTask,  /* Task handle. */
+      0);         /* Core where the task should run */
+
   Serial.println("initialization done.");
 }
 
-
-
 void loop()
 {
-
-  deactivateRFID();
-  audio.loop();
-  activateRFID();
-
-  if (newRfidInt) {
-      Serial.println("Interrupt.");
-      if(rfid.PICC_IsNewCardPresent()) {        
-        readRFID();
-        stop();
-      }
-  
-      
-      clearInt(rfid);
-      newRfidInt = false;
-      
+  if (audio.isRunning())
+  {
+    deactivateRFID();
+    activateSD();
+    audio.loop();
+    deactivateSD();
+    activateRFID();
   }
 
-  
-
-  if (buttonPressed(BTN_START_STOP)) {
-    if (audio.isRunning()) {
+  rfid_loop--;
+  if (rfid_loop == 0)
+  {
+    rfid_loop = RFID_LOOP_INTERVAL;
+    deactivateSD();
+    activateRFID();
+    if (rfid.PICC_IsNewCardPresent())
+    {
       stop();
-    } else {
-      start();
+      readRFID();
     }
   }
 
-
+  if (buttonPressed(BTN_START_STOP))
+  {
+    if (audio.isRunning())
+    {
+      stop();
+    }
+    else
+    {
+      start();
+    }
+  }
+  delay(5);
 }
 
-boolean buttonPressed(const uint8_t pin) {
+void loop2(void *parameter)
+{
+  for (;;)
+  {
+  }
+}
+
+boolean buttonPressed(const uint8_t pin)
+{
   if (digitalRead(pin) == LOW)
   {
     unsigned long now = millis();
     if (now - lastStart > startDelay)
     {
-      
+
       lastStart = now;
       return true;
     }
   }
   return false;
 }
-