No I2C communication with Nucleo-F411RE and ADXL345 I used STM32CubeMX to set up a Nucleo board (STM32F411RE) to communicate via I2C with a ADXL345 accelerometer.- RCC & clock settings at default- SDA on PB9 and SCL on PB8- I2C Fast Mode- targeted MDK-ARM toolchain- generated code In `main.c` added the following code, #define adxl_address 0x53<<1 // was told that this left shift was necessary for the HAL to fucntion properly??
uint8_t data_rec[6]; // data recieved in bytes
uint16_t x, y, z; // acc data
void adxl_write(uint8_t reg, uint8_t value)
{
uint8_t data[2];
data[0] = reg;
data[1] = value;
HAL_I2C_Master_Transmit(&hi2c1, adxl_address, data, 2, 10);
}
void adxl_read(uint8_t reg, uint8_t numberofbytes)
{
HAL_I2C_Mem_Read(&hi2c1, adxl_address, reg, 1, data_rec, numberofbytes, 100);
}
void adxl_init(void)
{
/* registers are all listed in adxl345 datasheet */
adxl_read(0x00, 1); // check if adxl is on line
adxl_write(0x2d, 0); // reset all bits
adxl_write(0x2d, 0x08); // measure bit-1, wakeup 0, 0 at 8hz
