Using I2C on PB10 and PB11 or I2C2 ports for stm32 with MPU6050

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waqasaps
Posts: 3
Joined: Mon Aug 27, 2018 4:53 am

Using I2C on PB10 and PB11 or I2C2 ports for stm32 with MPU6050

Post by waqasaps » Mon Aug 27, 2018 5:08 am

Hello there,
for some reasons i cannot use pin 6 and 7 for I2C communication with my MPU6050 with STM32F1. When i use Pin 6 &7 it works fine. Data is retrieved successfully. However the same code doesn't work on PB10 and PB11 ports.

Here is my code,

Code: Select all

#include 
#include 
long accelX, accelY, accelZ;
float gForceX, gForceY, gForceZ;
long gyroX, gyroY, gyroZ;
float rotX, rotY, rotZ;
void setup() {
  Serial.begin(57600);
  Wire.setClock(400000);
  Wire.begin();
  delay(250);
  Wire.beginTransmission(0x68);
  Wire.write(0x6B);
  Wire.write(0x00);
  Wire.endTransmission();
  setupMPU();
}
void loop() {
  //recordAccelRegisters();
  recordGyroRegisters();
  printData();
  delay(400);
}
void setupMPU(){
  Wire.beginTransmission(0b1101000); //This is the I2C address of the MPU (b1101000/b1101001 for AC0 low/high datasheet sec. 9.2)
  Wire.write(0x6B); //Accessing the register 6B - Power Management (Sec. 4.28)
  Wire.write(0b00000000); //Setting SLEEP register to 0. (Required; see Note on p. 9)
  Wire.endTransmission();  
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x1B); //Accessing the register 1B - Gyroscope Configuration (Sec. 4.4) 
  Wire.write(0x00000000); //Setting the gyro to full scale +/- 250deg./s 
  Wire.endTransmission(); 
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x1C); //Accessing the register 1C - Acccelerometer Configuration (Sec. 4.5) 
  Wire.write(0b00000000); //Setting the accel to +/- 2g
  Wire.endTransmission(); 
}
void recordAccelRegisters() {
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x3B); //Starting register for Accel Readings
  Wire.endTransmission();
  Wire.requestFrom(0b1101000,6); //Request Accel Registers (3B - 40)
  while(Wire.available() < 6); //wait for gyro to store results
  accelX = Wire.read()<<8|Wire.read(); //Store first two bytes into accelX
  accelY = Wire.read()<<8|Wire.read(); //Store middle two bytes into accelY
  accelZ = Wire.read()<<8|Wire.read(); //Store last two bytes into accelZ
  processAccelData();
}
void processAccelData(){
  gForceX = accelX / 16384.0;
  gForceY = accelY / 16384.0; 
  gForceZ = accelZ / 16384.0;
}
void recordGyroRegisters() {
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x43); //Starting register for Gyro Readings
  Wire.endTransmission();
  Wire.requestFrom(0b1101000,6); //Request Gyro Registers (43 - 48)
  while(Wire.available() < 6);
  gyroX = Wire.read()<<8|Wire.read(); //Store first two bytes into accelX
  gyroY = Wire.read()<<8|Wire.read(); //Store middle two bytes into accelY
  gyroZ = Wire.read()<<8|Wire.read(); //Store last two bytes into accelZ
  processGyroData();
}
void processGyroData() {
  rotX = gyroX / 131.0;
  rotY = gyroY / 131.0; 
  rotZ = gyroZ / 131.0;
}
void printData() {
  Serial.print("Gyro (deg)");
  Serial.print(" X=");
  Serial.print(rotX);
  Serial.print(" Y=");
  Serial.print(rotY);
  Serial.print(" Z=");
  Serial.print(rotZ);
 /* Serial.print(" Accel (g)");
  Serial.print(" X=");
  Serial.print(gForceX);
  Serial.print(" Y=");
  Serial.print(gForceY);
  Serial.print(" Z=");
  Serial.println(gForceZ);*/
  Serial.println(" ");
}
please help me use I2c2 ports , thanks

User avatar
Manny
Posts: 104
Joined: Wed Dec 09, 2015 3:15 pm

Re: Using I2C on PB10 and PB11 or I2C2 ports for stm32 with MPU6050

Post by Manny » Mon Aug 27, 2018 3:42 pm

Try this

Code: Select all

//#include 
#include 
//use IIC2
TwoWire WIRE2 (2,I2C_FAST_MODE);
#define Wire WIRE2
long accelX, accelY, accelZ;
float gForceX, gForceY, gForceZ;
long gyroX, gyroY, gyroZ;
float rotX, rotY, rotZ;
void setup() {
  Serial.begin(57600);
  Wire.setClock(400000);
  Wire.begin();
  delay(250);
  Wire.beginTransmission(0x68);
  Wire.write(0x6B);
  Wire.write(0x00);
  Wire.endTransmission();
  setupMPU();
}
void loop() {
  //recordAccelRegisters();
  recordGyroRegisters();
  printData();
  delay(400);
}
void setupMPU(){
  Wire.beginTransmission(0b1101000); //This is the I2C address of the MPU (b1101000/b1101001 for AC0 low/high datasheet sec. 9.2)
  Wire.write(0x6B); //Accessing the register 6B - Power Management (Sec. 4.28)
  Wire.write(0b00000000); //Setting SLEEP register to 0. (Required; see Note on p. 9)
  Wire.endTransmission();  
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x1B); //Accessing the register 1B - Gyroscope Configuration (Sec. 4.4) 
  Wire.write(0x00000000); //Setting the gyro to full scale +/- 250deg./s 
  Wire.endTransmission(); 
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x1C); //Accessing the register 1C - Acccelerometer Configuration (Sec. 4.5) 
  Wire.write(0b00000000); //Setting the accel to +/- 2g
  Wire.endTransmission(); 
}
void recordAccelRegisters() {
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x3B); //Starting register for Accel Readings
  Wire.endTransmission();
  Wire.requestFrom(0b1101000,6); //Request Accel Registers (3B - 40)
  while(Wire.available() < 6); //wait for gyro to store results
  accelX = Wire.read()<<8|Wire.read(); //Store first two bytes into accelX
  accelY = Wire.read()<<8|Wire.read(); //Store middle two bytes into accelY
  accelZ = Wire.read()<<8|Wire.read(); //Store last two bytes into accelZ
  processAccelData();
}
void processAccelData(){
  gForceX = accelX / 16384.0;
  gForceY = accelY / 16384.0; 
  gForceZ = accelZ / 16384.0;
}
void recordGyroRegisters() {
  Wire.beginTransmission(0b1101000); //I2C address of the MPU
  Wire.write(0x43); //Starting register for Gyro Readings
  Wire.endTransmission();
  Wire.requestFrom(0b1101000,6); //Request Gyro Registers (43 - 48)
  while(Wire.available() < 6);
  gyroX = Wire.read()<<8|Wire.read(); //Store first two bytes into accelX
  gyroY = Wire.read()<<8|Wire.read(); //Store middle two bytes into accelY
  gyroZ = Wire.read()<<8|Wire.read(); //Store last two bytes into accelZ
  processGyroData();
}
void processGyroData() {
  rotX = gyroX / 131.0;
  rotY = gyroY / 131.0; 
  rotZ = gyroZ / 131.0;
}
void printData() {
  Serial.print("Gyro (deg)");
  Serial.print(" X=");
  Serial.print(rotX);
  Serial.print(" Y=");
  Serial.print(rotY);
  Serial.print(" Z=");
  Serial.print(rotZ);
 /* Serial.print(" Accel (g)");
  Serial.print(" X=");
  Serial.print(gForceX);
  Serial.print(" Y=");
  Serial.print(gForceY);
  Serial.print(" Z=");
  Serial.println(gForceZ);*/
  Serial.println(" ");
}

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