can i calculate iaq without bsec_iot_loop() function

[pallyapd]

I am using bme680 for iaq calculation and another sensor is one of optical sensor which gives some optical data ...because of infinite bsec_iot_loop i can't do anything for this optical sensor .so please help me how to do other tasks while using Bsec_iot_loop(), I also trying timer-based interrupt to read optical data but after some time error occurs.is any method to calculate iaq .I have used the nrf52840 controller .and i want to run only one thread so please help me also i post my query on the community forum.

[BSTRobin]

Hello pallyapd,

nrf52840 had freertos support, you could start a task for optical sensor, and start another task for BSEC, run bsec_iot_loop().

[pallyapd]

i don't want to use freertos .my application include ble mesh and all framework is ready .so any other way to solve this instead of this os.?

[gbeloev · Accepted solution]

Hi,

You can certainly avoid using bsec_iot_loop() in your code. I think that is just an example provided by Bosch. In my code I implemented a function to perform the equivalent functionality but without the loop. The key is to pass the current timestamp to bsec_sensor_control(), which in turn tells you if measurements should be run, and also when to run the next measurement. Then in your code use a timer or another method to delay the next call until the appropriate time.

So basically (simplified):

    int64_t time_stamp = get_timestamp_us() * 1000ULL;

    bsec_sensor_control(time_stamp, &sensor_settings);
    bme680_bsec_trigger_measurement(&sensor_settings, sleep);
    bme680_bsec_read_data(time_stamp, bsec_inputs, &num_bsec_inputs, sensor_settings.process_data);
    bme680_bsec_process_data(bsec_inputs, num_bsec_inputs, output_ready);

    int64_t time_stamp_interval_ms = (sensor_settings.next_call - get_timestamp_us() * 1000ULL) / 1000000ULL;
    return (time_stamp_interval_ms > 0) ? time_stamp_interval_ms : 0;

I hope this helps.

[BSTRobin]

Hello gbeloev,

Thanks for your sharing.
Yes, we can modify it to the code we want based on the example code. @pallyapd, could your refer gbeloev's suggestion for your SW platform?