How can I get Ak8963 Address from MPU9250

[Ibarguen]

I try to read the value Who I Am from AK8963 in MPU9250, if I read the values of the accelerometer and the gyroscope in other skecth I have not problems, but When I try to configure the magnetometer first I need to know if there is connection in i2c bus but, If I run i2c Scan always find 0x68-- MPU9250 address but never AK8963 Addres 0X0C, I have already configured Bypass from Int_cpf.. register Address 0x37 with 0x02 here my code always return 255 from value Who I Am from AK8963.

Here my code

#include <Wire.h>
     const uint8_t AK8963 = 0X0C;//
    const uint8_t WIA = 0X00;
    const uint8_t MPU9250 = 0x68;

     const uint8_t ACCEL_XOUT_H = 0X3B;//direccion del registro donde se aloja el valor de lectura 
      acelerometro

    const uint8_t SMPLRT_DIV = 0X19;//registro divisor de frecuencia 
    //la frecuencia de muestreo del sensor es igual a la frecuencia del giroscopio divido 
    //el valor  dado en el registro SMPLRT_DIV + 1
    //Frecuencia de muestreo  giroscopio output rate/(1+SMPLRT_DIV) = 8KHZ/8 = 1KHZ



const uint8_t CONFIG = 0x1A;//Registro de configuracion de tasas de muestro y filtro acelerometro y giroscopio
const uint8_t USER_CTRL   =  0x6A;
const uint8_t SIGNAL_PATH_RESET = 0X68;
const uint8_t FIFO_EN = 0X23;
const uint8_t INT_ENABLE = 0X38;
const uint8_t PWR_MGMT_1   =  0x6B;
const uint8_t PWR_MGMT_2   =  0x6C;
const uint8_t ACCEL_CONFIG = 0X1C;//registro configuracion acelerometro
const uint8_t INT_PIN_CFG = 0X37;


void MPU9250_CONFIG()
{

delay(150);//espero 100 milisegundos
I2CWRITER(MPU9250 , SMPLRT_DIV, 0X07);//Envio el numero 7 al registro 
I2CWRITER(MPU9250 , CONFIG, 0X00);//Giroscopio con frecuencia de muestreo de 8KHZ
I2CWRITER(MPU9250 , FIFO_EN, 0X00);
I2CWRITER(MPU9250 , ACCEL_CONFIG , 0x00);
I2CWRITER(MPU9250 , INT_ENABLE, 0X01);
I2CWRITER(MPU9250 , SIGNAL_PATH_RESET, 0x00);
I2CWRITER(MPU9250 , USER_CTRL , 0X00);
I2CWRITER(MPU9250 , PWR_MGMT_1, 0x01);
I2CWRITER(MPU9250 , PWR_MGMT_2, 0x00);
I2CWRITER(MPU9250 , INT_PIN_CFG, 0x02);

}
void I2CWRITER(uint8_t deviceAddress, uint8_t regAdress, uint8_t dato)
{
   Wire.beginTransmission(deviceAddress);  
   Wire.write(regAdress);
   Wire.write(dato);
   Wire.endTransmission();


}



void setup()

{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
  MPU9250_CONFIG();
  
  
}

void loop() {

  Wire.beginTransmission(AK8963);
  Wire.write(WIA);  
  Wire.requestFrom(AK8963, 1);    
  byte c = Wire.read(); // receive a byte as character
  Serial.println(c);  
  delay(500);// print the character
  }

Datasheet say the register Who I am of AK8963 Magnetometer Should return 0x48 but I always read 0xFF or 255 in decimal..

#187
#123
#85

@kriswiner Please friend Help me, I try this from 1 week ago I',m very sad.. I can read Accelerometer and Gyroscope values in other sketch even Send the datas via rs232 or Wifi using ESP8266 Board but I can't comunnicate with AK8963.

So in the page 47 of register datasheet say this :

Addresses from 00H to 0CH and from 10H to 12H are compliant with automatic increment function of serial
interface respectively. Values of addresses from 10H to 12H can be read only in Fuse access mode. In other
modes, read data is not correct.

Maybe is that the problem ?

[kriswiner]

No idea here and I cannot debug your code. Please have a look at the example sketches which work well. You should only have to set the I2C bypass bit as part of the MPU6500 initialization to be able to talk with the AK8963C. If this doesn;t work, maybe there is something wrong with the IC, like it has no magnetometer....

…

On Thu, Jul 28, 2022 at 6:24 AM Ibarguen ***@***.***> wrote: I try to read the value Who I Am from AK8963 in MPU9250, if I read the values of the accelerometer and the gyroscope in other skecth I have not problems, but When I try to configure the magnetometer first I need to know if there is connection in i2c bus but, If I run i2c Scan always find 0x68-- MPU9250 address but never AK8963 Addres 0X0C, I have already configured Bypass from Int_cpf.. register Address 0x37 with 0x02 here my code always return 255 from value Who I Am from AK8963. Here my code #include <Wire.h> const uint8_t AK8963 = 0X0C;// const uint8_t WIA = 0X00; const uint8_t MPU9250 = 0x68; const uint8_t ACCEL_XOUT_H = 0X3B;//direccion del registro donde se aloja el valor de lectura acelerometro const uint8_t SMPLRT_DIV = 0X19;//registro divisor de frecuencia //la frecuencia de muestreo del sensor es igual a la frecuencia del giroscopio divido //el valor dado en el registro SMPLRT_DIV + 1 //Frecuencia de muestreo giroscopio output rate/(1+SMPLRT_DIV) = 8KHZ/8 = 1KHZ const uint8_t CONFIG = 0x1A;//Registro de configuracion de tasas de muestro y filtro acelerometro y giroscopio const uint8_t USER_CTRL = 0x6A; const uint8_t SIGNAL_PATH_RESET = 0X68; const uint8_t FIFO_EN = 0X23; const uint8_t INT_ENABLE = 0X38; const uint8_t PWR_MGMT_1 = 0x6B; const uint8_t PWR_MGMT_2 = 0x6C; const uint8_t ACCEL_CONFIG = 0X1C;//registro configuracion acelerometro const uint8_t INT_PIN_CFG = 0X37; void MPU9250_CONFIG() { delay(150);//espero 100 milisegundos I2CWRITER(MPU9250 , SMPLRT_DIV, 0X07);//Envio el numero 7 al registro I2CWRITER(MPU9250 , CONFIG, 0X00);//Giroscopio con frecuencia de muestreo de 8KHZ I2CWRITER(MPU9250 , FIFO_EN, 0X00); I2CWRITER(MPU9250 , ACCEL_CONFIG , 0x00); I2CWRITER(MPU9250 , INT_ENABLE, 0X01); I2CWRITER(MPU9250 , SIGNAL_PATH_RESET, 0x00); I2CWRITER(MPU9250 , USER_CTRL , 0X00); I2CWRITER(MPU9250 , PWR_MGMT_1, 0x01); I2CWRITER(MPU9250 , PWR_MGMT_2, 0x00); I2CWRITER(MPU9250 , INT_PIN_CFG, 0x02); } void I2CWRITER(uint8_t deviceAddress, uint8_t regAdress, uint8_t dato) { Wire.beginTransmission(deviceAddress); Wire.write(regAdress); Wire.write(dato); Wire.endTransmission(); } void setup() { Wire.begin(); // join i2c bus (address optional for master) Serial.begin(9600); // start serial for output MPU9250_CONFIG(); } void loop() { Wire.beginTransmission(AK8963); Wire.write(WIA); Wire.requestFrom(AK8963, 1); byte c = Wire.read(); // receive a byte as character Serial.println(c); delay(500);// print the character } Datasheet say the register Who I am of AK8963 Magnetometer Should return 0x48 but I always read 0xFF or 255 in decimal.. — Reply to this email directly, view it on GitHub <#481>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKU44VYPZ2LOUUJ2ZVLVWKCXVANCNFSM545ILVAQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>