Question about SPI control TOSHIBA TC9459F IC?

[jerrylong_km]

Hello Guys
I am learning how to control TOHIBA TC9459F IC chip, which is a electronic volume control IC.

This chip using SPI to control

this is my testing code in Arduino

#include <SPI.h>

#define CSPin 2

byte L = B11100100;
byte R = B00011001;
byte LD = B00001101;
//byte CS = B0001;
uint16_t temp = 0;

void setup() {

  pinMode(CSPin, OUTPUT);
  digitalWrite(CSPin,HIGH);
  digitalWrite(SS,HIGH);

  // initialize SPI:
  SPI.begin();
  SPI.beginTransaction(SPISettings(1000000, LSBFIRST, SPI_MODE0));

  //for debug and demostration
  Serial.begin(9600);

  delay(1000);
}

void loop() {

  //for(int i=0;i<=89;i++)
  //{
    TC9459F_Write(L, R, LD);
  //}

  //for(int i=0;i<=89;i++)
  //{
  //  TC9459F_Write(89-i, R, LD);
  //}
  
}

void TC9459F_Write(uint8_t LeftVolume, uint8_t RightVolume, const bool Loundness)
{

  // take the CS pin low to select the chip:

  digitalWrite(SS, LOW);

  //delay(100);

  //  send in the value via SPI:

  SPI.transfer(LeftVolume);
  SPI.transfer(RightVolume);
  SPI.transfer(Loundness);
  //SPI.transfer(CS);
  

  //delay(100);

  // take the CS pin high to de-select the chip:

  digitalWrite(SS, HIGH);
}

I am try to send LeftVolume, RightVolume and LD binary data to TC9459

byte L = B11100100;
byte R = B00011001;
byte LD = B00001101;

//  send in the value via SPI:

  SPI.transfer(LeftVolume);
  SPI.transfer(RightVolume);
  SPI.transfer(Loundness);

and I used Loghic 2 to show the result.

The LeftVolume and RightVolume data are correct, but the LD data is not. what is wrong with it ?

[jerrylong_km]

No matter what I sent to LD, it is still b1000 0000

Only I sent b00000000, it will b0000 0000

[horace]

could it be

void TC9459F_Write(uint8_t LeftVolume, uint8_t RightVolume, const bool Loundness)

because Loundness is declared as a bool??

[jerrylong_km]

Oh yes, thank you very much.

[jerrylong_km]

I works now. Thank you very much.

[jerrylong_km]

东芝TC9459F-音量控制芯片.pdf (416.1 KB)
This is the datasheet of the TC9459F IC chips, it is a digital volume control IC
But I can't control it with Arduino UNO.
This is my testing code:

#include <SPI.h>

/*
 STB(12)->Arduino(10)
 DATA(11)->Arduino(11)
 SCK(10)->Arduino(13)
*/
#define CSPin_L 2
#define CSPin_R 3

byte L = B01001100;
byte R = B01010000;
byte LD = B10110000;
//byte CS = B0001;
int inputNum = 50;

void setup() {

  pinMode(CSPin_L, OUTPUT);
  pinMode(CSPin_R, OUTPUT);
  digitalWrite(CSPin_L, HIGH);
  digitalWrite(CSPin_R, HIGH);
  digitalWrite(SS,HIGH);

  // initialize SPI:
  SPI.begin();
  SPI.beginTransaction(SPISettings(500000, LSBFIRST, SPI_MODE0));

  //for debug and demostration
  Serial.begin(9600);
  Serial.setTimeout(5);

  delay(1000);
}

void loop() {

  // Flush the input buffer
  //while (Serial.available())
  //Serial.read();
    
  //while (Serial.available())
  //{
  //  inputNum = Serial.parseInt();
  //  Serial.print("input = ");
  //  Serial.println(inputNum);
  //}

  TC9459F_Write(inputNum, inputNum, LD);
  
  //for(int i=0;i<90;i++)
  //{
  //  TC9459F_Write(i, i, LD);
  //}

  //for(int i=90;i>=0;i--)
  //{
  //  TC9459F_Write(i, i, LD);
  //}

  //delay(1000);
}

void TC9459F_Write(uint8_t LeftVolume, uint8_t RightVolume, uint8_t Loundness)
{

  // take the CS pin low to select the chip:

  digitalWrite(SS, LOW);
  digitalWrite(CSPin_L, LOW);
  //delay(100);

  //  send in the value via SPI:

  SPI.transfer(LeftVolume);
  SPI.transfer(RightVolume);
  SPI.transfer(Loundness);
  //SPI.transfer(CS);
  

  //delay(100);

  // take the CS pin high to de-select the chip:

  digitalWrite(SS, HIGH);
  digitalWrite(CSPin_L, HIGH);
}

[jerrylong_km]

When I set inputNum to 0

this is what I got from CK(pin 13), DATA(pin 11) and STB(pin 10)

There is no attenuation of the signal.

It is correct.

[jerrylong_km]

But when I set inputNum to 50

this is what I got from CK(pin 13), DATA(pin 11) and STB(pin 10)

it is -50dB attenuation according to datasheet

but no attenuation of the output.

What is the problem of the code?