#include <SI4844.h>
#include <Wire.h>

// Arduino Pin (tested on pro mini)
#define INTERRUPT_PIN 2
#define RESET_PIN 12


#define DEFAULT_BAND 4

SI4844 si4844; 

void setup() {

    // Initiate and connect the device ATDD (SI4844) to Arduino
    si4844.setup(RESET_PIN, INTERRUPT_PIN, DEFAULT_BAND);

}

void loop() {


  // if something changed on ATDD (SI4844), do something  
  if (si4844.hasStatusChanged())
  {
    Serial.print("Band Index: ");
    Serial.print(si4844.getStatusBandIndex());
    Serial.print(" - ");
    Serial.print(si4844.getBandMode());
    Serial.print(" - Frequency: ");    
    Serial.print(si4844.getFrequency(),0);
    Serial.print(" KHz");
    Serial.print(" - Stereo ");
    Serial.println(si4844.getStereoIndicator());
  }

}

/* 
 * The structure below represents the four bytes response got by command ATDD_GET_STATUS
 * See Si48XX ATDD PROGRAMMING GUIDE, pages 14 and 15
 */
typedef struct
{
  byte BCFG0 : 1;     // Bit 0
  byte BCFG1 : 1;     // bit 1
  byte STEREO : 1;    // bit 2
  byte STATION : 1;   // bit 3
  byte INFORDY : 1;   // bit 4
  byte HOSTPWRUP : 1; // bit 5
  byte HOSTRST : 1;   // bit 6
  byte CTS : 1;       // bit 7
  byte BANDIDX : 6;   // Form bit 0 to 5
  byte BANDMODE : 2;  // From bit 6 to 7
  byte d2 : 4;        // Frequency digit 2
  byte d1 : 4;        // Frequency digit 1
  byte d4 : 4;        // Frequency digit 4
  byte d3 : 4;        // frequency digit 3
} si4844_get_status;

/*
 * Uses a C language feature to represent two way for the 4 response bytes (status) sent by the ATDD_GET_STATUS.
 * It is needed to undertand the C language union concept.
 * See Si48XX ATDD PROGRAMMING GUIDE, pages 14 and 15 
*/
typedef union {
  si4844_get_status refined;
  byte raw[4];
} si4844_status_response;

// English:
// GET_REV structure. The structure below represents 9 bytes response for GET_REV command.
// STATUS and RESP1 to RESP8.  See Si48XX ATDD PROGRAMMING GUIDE; AN610, page 22.
// Portuguese:
typedef struct
{
  byte RESERVED : 6; // Bit 0 to 5
  byte ERR : 1;      // bit 6
  byte CTS : 1;      // bit 2
  byte PN;           // Final 2 digits of Part Number (HEX).
  byte FWMAJOR;      // Firmware Major Revision (ASCII).
  byte FWMINOR;      // Firmware Minor Revision (ASCII).
  byte CMPMAJOR;     // Component Major Revision (ASCII).
  byte CMPMINOR;     // Component Minor Revision (ASCII).
  byte CHIPREV;      // Chip Revision (ASCII).
} si4844_firmware_info;

typedef union {
  si4844_firmware_info refined;
  byte raw[9];
} si4844_firmware_response;

/*
* Initiate the SI4844 instance and connect the device (SI4844) to Arduino. 
* Calling this library should be the first thing to do to control the SI4844.
*
* @param resetPin  arduino pin used to reset the device
* @param interruprPin arduino pin used to handle interrupr      
* @param defaultBand band that the radio should start
*/
void setup(unsigned int, unsigned int, byte)

  si4844.setup(12, 2, 4);

/*
 * reset
 * English
 * See pages 7, 8, 9 and 10 of the programming guide.
 */
void reset(void )

  si4844.reset();

/*
 * Set the radio to a new band. 
 * See Table 8. Pre-defined Band Table in Si48XX ATDD PROGRAMMING GUIDE; AN610; pages 17 and 18  
 */
void setBand(byte);

  si4844.setBand(4); // FM

/*
 *  Up or down the sound volume level/  
 *  @param char ' ' up and '-' down 
 */
void changeVolume(char);

  si4844.changeVolume(' '); 

/*
 * Set the sound volume level. 
 * @param byte volumeLevel (domain: 0 to 63) 
 */
setVolume(byte level)

  si4844.setVolume(55);

/*
 * Get tune freq, band, and others information, status of the device.
 * Use this method only if you want to deal with that information by yourself. 
 * This library has other methods to get that information easier. 
 * 
 * @return a pointer to a structure type si4844_status_response
 */
si4844_status_response *getStatus(void);

  si4844.getStatus();

/*
 * Get part number, chip revision, firmware, patch, and component revision numbers.
 * You do not need to call this method. It is executed just once at setup methos. 
 * There are other methods that give you that information.   
 * See page 22 of programming guide.
 * 
 * @return a pointer to a structure type  with the part number, chip revision, 
 *         firmware revision, patch revision, and component revision numbers.
 */
si4844_firmware_response *getFirmware(void);

  si4844.getFirmware();

/*
 * Get the current frequency of the radio in KHz. 
 * For example: FM, 103900 KHz (103.9 MHz);
 *              SW, 7335 KHz (7.34 MHz, 41m)   
 * 
 * @return float current frequency in KHz.  
 */
float getFrequency(void);

    Serial.print("Frequency: ");    
    Serial.print(si4844.getFrequency(),0);

/*
*  Check if the SI4844 has its status changed. If you move the tuner, for example,
*  the status of the device is changed. 
*
*  return true or false  
*/
bool hasStatusChanged(void);

  if (si4844.hasStatusChanged())
  {
    Serial.print(" - Frequency: ");    
    Serial.print(si4844.getFrequency(),0);
    Serial.print(" KHz");
    Serial.print(" - Stereo ");
    Serial.println(si4844.getStereoIndicator());
  }

void resetStatus(void);

/*
 * Get te current band(FM/AM/SW)
 * @return char * "FM", "AM" or "SW".
 */ 
inline String getBandMode()

/*
 * Get a string (char *) On or Off indicating stereo situation. 
 * return char * "On" or "Off"
 */
inline String getStereoIndicator()

/*
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusBCFG0() 

/*
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusBCFG1() 

/*
 * Return a integer indicating the stereo status (0 = Off and 1 = On).
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusStereo() 

/*
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusStationIndicator() 

/*
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusInformationReady() 

/*
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusHostPowerUp() 

/*
 * See Si48XX ATDD PROGRAMMING GUID, AN610, pages 15 and 16
 */
inline unsigned getStatusHostReset() 

/*
 * Return an integer (0 - FM; 1 = AM and 2 = SW) 
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusBandMode() 

/*
 * return an integer with the currente band index in use. 
 * Set Table 13. Pre-defined Band Table in Si48XX ATDD PROGRAMMING GUID, AN610, pages 39 and 40
 */
inline unsigned getStatusBandIndex() 

/*
 * See Si48XX ATDD PROGRAMMING GUIDE, AN610, pages 15 and 16
 */
inline unsigned getStatusCTS() 

inline unsigned getFirmwareErr()

inline unsigned getFirmwareCTS()

/*
 * Get Firmware Final 2 digits of Part Number (HEX).
 */ 
inline unsigned getFirmwarePartNumber() 

/*
 * Get Firmware Major Revision (ASCII).
 */ 
inline unsigned getFirmwareMajorRevision() 

/*
 * Get Firmware Minor Revision (ASCII).
 */
inline unsigned getFirmwareMinorRevision() 

/*
 * Get Firmware Component Major Revision (ASCII).
 */ 
inline unsigned getFirmwareComponentMajorRevision() 

/* 
 * Get Firmware Component Minor Revision (ASCII).
 */
inline unsigned getFirmwareComponentMinorRevision() 

/*
 * Chip Revision (ASCII).
 */
inline unsigned getFirmwareChipRevision() 

  Serial.println("\nSI4844 -  Firmware information\n");

  si4844.getFirmware();
  Serial.print("Final 2 digits of Part Number..: ");
  Serial.println(si4844.getFirmwarePartNumber());
  Serial.print("Firmware Major Revision........: ");
  Serial.println(si4844.getFirmwareMajorRevision());
  Serial.print("Firmware Minor Revision........: ");
  Serial.println(si4844.getFirmwareMinorRevision());
  Serial.print("Component Major Revision.......: ");
  Serial.println(si4844.getFirmwareComponentMajorRevision());
  Serial.print("Component Minor Revision.......: "); 
  Serial.println(si4844.getFirmwareComponentMinorRevision());
  Serial.print("Chip Revision..................: ");
  Serial.println(si4844.getFirmwareChipRevision());

  Serial.println("*****************************");