About boydy

Hi I am developing a lightweight sensor board which contains the BME688. I am looking to implement the forced read mode, and have written code that I believe reflects the quick start. I am using the sensor with SPI and can communicate with the device, and am writing the code as a bare metal implementation in C. I am also able to read back any register value, and am getting values for temp, pressure and humidity - but nothing for gas resistance. The gas_r_lsb register is reporting 0x04, which suggests that the device has not achieved the heating current - yet no changes of times or target currents seem to change this. I have read back the registers in the device, and they all appear to be as expected. I have also observed that the current draw from the device does inrease if the heating time is increased, as I can see the linear device that powers it warm up by a few degrees with a thermal camera when the time is extended. As an experiment I also switched the device into paralell mode, but this made no difference to the output. What am I missing? Ta! ... View more