In Setup, we need to configure SPI correctly according to the SPI protocol of ISD1700:

void setup()

{

  Serial.begin(9600);

  pinMode(cs,OUTPUT);

  //start the SPI library

  SPI.begin();

  SPI.setBitOrder(LSBFIRST);        // data shifted in Least Significant Bit (LSB) first

  SPI.setDataMode(SPI_MODE3);    // data are captured on clock's rising edge and data are propagated on a falling edge.

}

//Read Device ID,the device is ISD1730

//Write to and read APC register

#include

#define uchar unsigned char

#define uint unsigned int

const int cs=10;        //chip select

uchar SR0_L;

uchar SR0_H;

uchar SR1;

uchar ID,APCL=0,APCH=0,SBUF;

void setup()

{

  Serial.begin(9600);

  pinMode(cs,OUTPUT);

  //start the SPI library

  SPI.begin();

  SPI.setBitOrder(LSBFIRST);

  SPI.setDataMode(SPI_MODE3);

}

void loop()

{

    Serial.println("Read Device ID:");

    digitalWrite(cs,LOW);        //Read Device ID

    SPI.transfer(0x09|0x10);

    SPI.transfer(0x00);

    ID=SPI.transfer(0x00);

    digitalWrite(cs,HIGH);

    delay(100);

    Serial.println(ID,BIN);

    Serial.println("");

   digitalWrite(cs,LOW);           //RESET

   SPI.transfer(0x03|0X10);

   SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

   do

   {

   digitalWrite(cs,LOW);           //PU ,idle

   SPI.transfer(0x01|0x10);

   SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

    ISD_RD_STATUS();

    }while(SR0_L & 0x01);

   delay(50);                 //Wait PU

   digitalWrite(cs,LOW);          //RD_APC when Power-on reset or Reset,namely Read value from NVCFG register

   SR0_L=SPI.transfer(0x54);

   SR0_H=SPI.transfer(0x00);

   APCL=SPI.transfer(0x00);

   APCH=SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

   Serial.println("Befor WR_APC:");

   Serial.print("SR0_L=");

   Serial.println(SR0_L,BIN);

   Serial.print("SR0_H=");

   Serial.println(SR0_H,BIN);

   Serial.print("APCL=");

   Serial.println(APCL,BIN);

   Serial.print("APCH=");

   Serial.println(APCH,BIN);

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

   CLR_INT();

   digitalWrite(cs,LOW);        //WR_APC2

   SPI.transfer(0x65|0x10);

   SPI.transfer(0x4C);

   SPI.transfer(0x0C);

   digitalWrite(cs,HIGH);

   delay(100);

    do

   {ISD_RD_STATUS();}

          while(!(SR1 & 0x01));

  /* digitalWrite(cs,LOW);        // WR_NVCFG

   SPI.transfer(0x46|0x10);

   SPI.transfer(0x00);

   digitalWrite(cs.HIGH);

   delay(100);*/

   digitalWrite(cs,LOW);          //RD_APC

   SR0_L=SPI.transfer(0x54);

   SR0_H=SPI.transfer(0x00);

   APCL=SPI.transfer(0x00);

   APCH=SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

   Serial.println("After WR_APC2:");

   Serial.print("SR0_L=");

   Serial.println(SR0_L,BIN);

   Serial.print("SR0_H=");

   Serial.println(SR0_H,BIN);

   Serial.print("APCL=");

   Serial.println(APCL,BIN);

   Serial.print("APCH=");

   Serial.println(APCH,BIN);

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

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

   delay(500);

  digitalWrite(cs,LOW);         //PD

  SPI.transfer(0x07|0x10);

  SPI.transfer(0x00);

  digitalWrite(cs,HIGH);

  delay(100);

}

void ISD_RD_STATUS(void)

  {

   digitalWrite(cs,LOW);

   SR0_L=SPI.transfer(0x050x10);

   SR0_H=SPI.transfer(0x00);

   SR1=SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

  }

  void CLR_INT(void)

  {

   digitalWrite(cs,LOW);

   SPI.transfer(0x04|0x10);

   SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

  }

The serial shows：

Bit description of DEVICEID Register

Remove  /* */ in bold type from code, then translate and download it, and e can see from the serial: ：

WR_NVCFG (0x46) writes the present content of APC into NVCFG register. Once the device is powered on or reset, the chip will read the value from NVCGF register and send it to APC register. If ISD1700 is not in idle state, the chip will send a command to set CND_ERR of SRO to be 1.

2)     Record a few notes first, and use the code to achieve fixed-point play.

#include

#define uchar unsigned char

#define uint unsigned int

const int cs=10;   //chip select

uchar SR0_L;

uchar SR0_H;

uchar SR1;

//uchar ID,APCL=0,APCH=0,SBUF;

void setup()

{

  Serial.begin(9600);

  pinMode(cs,OUTPUT);

  //start the SPI library

  SPI.begin();

  SPI.setBitOrder(LSBFIRST);

  SPI.setDataMode(SPI_MODE3);

}

void loop()

{

   digitalWrite(cs,LOW);            //RESET

   SPI.transfer(0x03);

   SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

  do{

   digitalWrite(cs,LOW);             //Power Up

   SPI.transfer(0x01);

   SPI.transfer(0x00);

   digitalWrite(cs,HIGH);

   delay(100);

  ISD_RD_STATUS();                   //CMD_ERR=?

    }while(SR0_L & 0x01);

   delay(50);                       //The delay of PU

   CLR_INT();                      

   do

   {ISD_RD_STATUS();}

          while(!(SR1 & 0x01));

  digitalWrite(cs,LOW);                  //SET_PLAY

  SPI.transfer(0x90);                    //With LED function

  SPI.transfer(0x00);

  SPI.transfer(0x10);                   //S0~S10

  SPI.transfer(0x00);

  SPI.transfer(0xEF);                    //E0~E10

  SPI.transfer(0x00);