Looking through the data sheet for the BMA456 I don't see any indication on how accurate the temperature sensor is. When working with the ESP32 Arduino toolchain the temperature reading from bma4_get_temperature() returns 274000 for a celcius read which should be 14 (14000 as it is *1000). When I modify this function I can get sensible numbers but the sensor seems to over read by about 4degrees. In bma4.c bma4_get_temperature(), the following code does not give the expected result in the ESP32 toolchain:-
if (rslt == BMA4_OK)
{
temp_raw_scaled = (int32_t)data[BMA4_TEMP_BYTE] * BMA4_SCALE_TEMP;
}
/* '0' value read from the register corresponds to 23 degree C */
(*temp) = temp_raw_scaled + (BMA4_OFFSET_TEMP * BMA4_SCALE_TEMP);
wheres as the following code does:
if (rslt == BMA4_OK)
{
acc = (int8_t)data[BMA4_TEMP_BYTE];
temp_raw_scaled = (int32_t)acc * BMA4_SCALE_TEMP;
}
/* '0' value read from the register corresponds to 23 degree C */
(*temp) = temp_raw_scaled + (BMA4_OFFSET_TEMP * BMA4_SCALE_TEMP);
