receiver.h

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#pragma once
 
#include <Arduino.h>
#include "protocol.h"
#include "csprng.h"
#include <ChaChaPoly.h>
 
const uint8_t RX_BUZZER_PIN        = 9;    
const uint8_t ENTROPY_RING_OSC_PIN = 2;    
const uint8_t RX_LCD_ADDR          = 0x3E; 
const uint8_t RX_LCD_COLS          = 16;   
const uint8_t RX_LCD_ROWS          = 2;    
 
const uint8_t NOTE_DICT_SIZE = 21;
 
enum class RxState : uint8_t {
  WAITING_SYNC_1,   
  WAITING_SYNC_2,   
  WAITING_FOR_TYPE, 
  READING_HELLO,    
  READING_DATA,     
  GOT_HELLO,        
  GOT_DATA,         
  EXECUTING_ACTION  
};
 
void rx_setup();
 
void rx_loop();
 
void processReceivedByte(uint8_t inByte);
 
void processHelloBody();
 
void authenticateAndPlay(const DataPacket* pkt);
 
void processFinPacket(const DataPacket* pkt);
 
void resetParser();
 
void startNote(uint16_t frequencyHz, uint16_t durationMs);
 
void stopNote();
 
void updateRxDisplay(RxState state, uint16_t seqNum, bool macOk);
 
void generateEntropyPool(uint8_t* outputSeed);