Posted on May 28, 2018 at 14:39I have an STM32F303 Discovery and I want to use the I2C bus to receive the x,y,z data from an accelerometer MPU6050. Does anyone have source code for this? The problem is that the address of the buffers (i2cBuff) are 0, and the Xaccel, Yaccel, Zaccel too.
Here is my code:
&sharpinclude 'main.h'
&sharpinclude 'stm32f3xx_hal.h'
I2C_HandleTypeDef hi2c1;
&sharpdefine mpu6050Address 0xD0
uint8_t i2cBuf[8];
uint16_t ax,ay,az;
float Xaccel,Yaccel,Zaccel;
int main(void)
{
//HAL Initialise
HAL_Init();
//Config functions
GPIO_Config();
I2C_Config();
//1. Scan the I2C addresses
for(uint8_t i=0; i<255; i++)
{
if(HAL_I2C_IsDeviceReady(&hi2c1, i, 1, 10) == HAL_OK)
{ HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_12);
break;
}
}
//2. I2C Write example
//a) Set accelerometer range (reg28)
i2cBuf[0] = 28; //Register address: Accelerometer config 1
i2cBuf[1] = 0x08; //Data to write, +-8g range
HAL_I2C_Master_Transmit(&hi2c1, mpu6050Address, i2cBuf, 2, 10);
//3. I2C Read example
//Request to read from a register (reg28)
i2cBuf[0] = 28; //Register address: Accelerometer config 1
HAL_I2C_Master_Transmit(&hi2c1, mpu6050Address, i2cBuf, 1, 10);
//Read data
i2cBuf[1] = 0x00;
HAL_I2C_Master_Receive(&hi2c1, mpu6050Address|0x01, &i2cBuf[1], 1, 10);
while(1)
{
//4. Read accelerometer data
HAL_I2C_Mem_Read(&hi2c1, mpu6050Address, 0x3B, I2C_MEMADD_SIZE_8BIT, &i2cBuf[1], 6, 10);
ax = -(i2cBuf[1]<<8 | i2cBuf[2]);
ay = -(i2cBuf[3]<<8 | i2cBuf[4]);
az = (i2cBuf[5]<<8 | i2cBuf[6]);
Xaccel = ax/8192.0;
Yaccel = ay/8192.0;
Zaccel = az/8192.0;
HAL_Delay(50);
}
}
#accelerometer #i2c #mpu6050 #stm32f3
