err_t adxl345GetDataRate(adxl345_dataRate_t *dataRate)
{
uint8_t results;
ASSERT_STATUS(adxl345Read8(ADXL345_REG_BW_RATE, &results));
*dataRate = (adxl345_dataRate_t)(results & 0x0F);
return ERROR_NONE;
}
err_t adxl345GetRange(adxl345_range_t *range)
{
uint8_t results;
ASSERT_STATUS(adxl345Read8(ADXL345_REG_DATA_FORMAT, &results));
*range = (adxl345_range_t)(results & 0x03);
return ERROR_NONE;
}
error_t adxl345SetRange(adxl345_range_t range)
{
uint8_t format;
/* Red the data format register to preserve bits */
ASSERT_STATUS(adxl345Read8(ADXL345_REG_DATA_FORMAT, &format));
/* Update the data rate */
format &= ~0x0F;
format |= range;
/* Write the register back to the IC */
ASSERT_STATUS(adxl345Write8(ADXL345_REG_DATA_FORMAT, format));
return ERROR_NONE;
}
err_t adxl345SetRange(adxl345_range_t range)
{
uint8_t format;
/* Red the data format register to preserve bits */
ASSERT_STATUS(adxl345Read8(ADXL345_REG_DATA_FORMAT, &format));
/* Update the data rate */
format &= ~0x0F;
format |= range;
/* Make sure that the FULL-RES bit is enabled for range scaling */
format |= 0x08;
/* Write the register back to the IC */
ASSERT_STATUS(adxl345Write8(ADXL345_REG_DATA_FORMAT, format));
return ERROR_NONE;
}
err_t adxl345Init(void)
{
uint8_t devid = 0x00;
/* Initialise I2C */
i2cInit(I2CMASTER);
/* Ping the I2C device first to see if it exists! */
ASSERT(i2cCheckAddress(ADXL345_ADDRESS), ERROR_I2C_DEVICENOTFOUND);
/* Check device ID register to see if everything is properly connected */
ASSERT_STATUS(adxl345Read8(ADXL345_REG_DEVID, &devid));
if (devid != 0xE5)
{
return ERROR_I2C_DEVICENOTFOUND;
}
/* Enable measurements */
ASSERT_STATUS(adxl345Write8(ADXL345_REG_POWER_CTL, 0x08));
_adxl345Initialised = true;
return ERROR_NONE;
}
