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Thanks for your message. I can"t share my personnal code in public, and without specific board, you cannot test it. There is 2 things to check: input, and if input are not enough: init. My init functions are on buttom of my second post, as requested, on the 1st page. There is no error detecting from processor side when running. Especially you will find: return_values_init bsec_iot_init() calling static bsec_library_return_t bme680_bsec_update_subscription() I can't share content of bme680_bsec_process_data, as I don't know what's inside. All what I see is smart data such as IAQ stays at 25.00 or 0.00, as if something just ask to to process.   ... View more

I would also like to add, after 300seconds, bsec buffers. I cannot use them to deduct anything, but maybe you can. work buffer: 08 00 0A A5 AC 50 BA 41 00 00 00 00 00 00 00 00 00 8D 8F 48 01 00 00 00 2C 01 14 14 00 00 00 00 00 00 00 00 00 00 03 00 18 A8 5F 3F 14 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 A5 ...(0xA5 in loop until last 2048th byte) bsec_state: 00 08 04 01 3D 00 00 00 00 00 00 00 73 00 00 00 2D 00 01 A5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2C 01 14 14 00 00 00 00 00 00 00 00 00 00 03 00 18 A8 5F 3F 14 0C 00 02 A5 00 00 C8 41 00 00 C8 41 10 00 03 A5 38 A7 9D 40 4B BD B9 41 52 B0 32 42 16 00 05 A5 2F 88 04 00 00 00 00 00 00 00 00 00 00 8D 8F 48 01 00 0C 00 09 A5 2F 88 04 00 00 00 00 00 08 00 0A A5 AC 50 BA 41 A5 A5 A5 A5 C4 91 00 00 ... View more

Input values + IAQ are displayed multiplied by 100 (cf code). As I can't print float, and to check float really don't move, I print them them as integer multiplied first by 100. But I did multiplied raw values by 100 after converting, that's solved in my new logs. You can also see that accuracy is always 0 (the value just after iaq=2500 ) So there is no problem of temperature and of units. There is a problem of IAQ computation 🙂 Problem is somewhere else: either  computation is wrong, either library init is wrong. I also copied initialisation, on my previous post. As I can't check computation and where it fails, it's harder to check what's wrong with my init. ... View more

Thank you. I hoped to learn how to fish, not getting just a fish. Anyway, you can get some log  before and after bme680_bsec_process_data. Time is uint64_t, but my printf is not able to display such number (as floats),as bosch has the great idea to count timestamp in ns (yummy for 32bit processors) This is code for logs attached: printf("bsec_inputs total: %d\r\n",num_bsec_inputs); for(uint8_t i=0;i<5;i++) printf("bsec_inputs %d :%d %d %d %d\r\n", i, (int32_t)bsec_inputs[i].time_stamp, (int32_t)bsec_inputs[i].signal*100, (int32_t)bsec_inputs[i].signal_dimensions, (int32_t)bsec_inputs[i].sensor_id); printf("\r\n"); /* Time to invoke BSEC to perform the actual processing */ bme680_bsec_process_data(bsec_inputs, num_bsec_inputs, output_ready); I would have prefered to fill a struct instead of getting function prototype, anyway, it works well: void output_ready(int64_t timestamp, float iaq, uint8_t iaq_accuracy, float temperature, float humidity, float pressure, float raw_temperature, float raw_humidity, float gas, bsec_library_return_t bsec_status, float static_iaq, float co2_equivalent, float breath_voc_equivalent) { printf("%d %d %d %d %d %d %d %d %d %d %d %d %d \r\n", (int32_t) timestamp, (int32_t) iaq*100, (int32_t) iaq_accuracy, (int32_t)temperature, (int32_t)humidity, (int32_t)pressure, (int32_t)raw_temperature, (int32_t)raw_humidity, (int32_t)gas, (int32_t)bsec_status, (int32_t)static_iaq, (int32_t)co2_equivalent, (int32_t)breath_voc_equivalent); printf("\r\n"); } I have attached logs  for few minutes. Here the init, with no error found: bsec_iot_init(BSEC_SAMPLE_RATE_LP, 0,user_spi_write,user_spi_read, user_delay_ms, state_load, config_load); calling return_values_init bsec_iot_init(float sample_rate, float temperature_offset, bme680_com_fptr_t bus_write, bme680_com_fptr_t bus_read, sleep_fct sleep, state_load_fct state_load, config_load_fct config_load) { return_values_init ret = {BME680_OK, BSEC_OK}; bsec_library_return_t bsec_status = BSEC_OK; uint8_t bsec_state[BSEC_MAX_STATE_BLOB_SIZE] = {0}; uint8_t bsec_config[BSEC_MAX_PROPERTY_BLOB_SIZE] = {0}; uint8_t work_buffer[BSEC_MAX_WORKBUFFER_SIZE] = {0}; int bsec_state_len, bsec_config_len; ... Init spi ... /* Initialize BSEC library */ ret.bsec_status = bsec_init(); if (ret.bsec_status != BSEC_OK) { NRF_LOG_ERROR("bsec_init: %d",ret.bme680_status); return ret; } else NRF_LOG_INFO("bsec_init !"); /* Load library config, if available */ bsec_config_len = config_load(bsec_config, sizeof(bsec_config)); if (bsec_config_len != 0) { ret.bsec_status = bsec_set_configuration(bsec_config, bsec_config_len, work_buffer, sizeof(work_buffer)); if (ret.bsec_status != BSEC_OK) { NRF_LOG_ERROR("bsec_set_configuration: %d",ret.bme680_status); return ret; } else NRF_LOG_INFO("bsec_set_configuration !"); } /* Load previous library state, if available */ bsec_state_len = state_load(0,bsec_state, sizeof(bsec_state)); if (bsec_state_len != 0) { ret.bsec_status = bsec_set_state(bsec_state, bsec_state_len, work_buffer, sizeof(work_buffer)); if (ret.bsec_status != BSEC_OK) { return ret; } else NRF_LOG_INFO("bsec_set_state !"); } /* Set temperature offset */ bme680_temperature_offset_g = temperature_offset; /* Call to the function which sets the library with subscription information */ ret.bsec_status = bme680_bsec_update_subscription(sample_rate); if (ret.bsec_status != BSEC_OK) { NRF_LOG_ERROR("bme680_bsec_update_subscription: %d",ret.bme680_status); return ret; } else NRF_LOG_INFO("bme680_bsec_update_subscription !"); NRF_LOG_INFO("bsec_init success"); return ret; Calling this funciton: static bsec_library_return_t bme680_bsec_update_subscription(float sample_rate) { bsec_sensor_configuration_t requested_virtual_sensors[NUM_USED_OUTPUTS]; uint8_t n_requested_virtual_sensors = NUM_USED_OUTPUTS; bsec_sensor_configuration_t required_sensor_settings[BSEC_MAX_PHYSICAL_SENSOR]; uint8_t n_required_sensor_settings = BSEC_MAX_PHYSICAL_SENSOR; bsec_library_return_t status = BSEC_OK; /* note: Virtual sensors as desired to be added here */ requested_virtual_sensors[0].sensor_id = BSEC_OUTPUT_IAQ; requested_virtual_sensors[0].sample_rate = sample_rate; requested_virtual_sensors[1].sensor_id = BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_TEMPERATURE; requested_virtual_sensors[1].sample_rate = sample_rate; requested_virtual_sensors[2].sensor_id = BSEC_OUTPUT_RAW_PRESSURE; requested_virtual_sensors[2].sample_rate = sample_rate; requested_virtual_sensors[3].sensor_id = BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_HUMIDITY; requested_virtual_sensors[3].sample_rate = sample_rate; requested_virtual_sensors[4].sensor_id = BSEC_OUTPUT_RAW_GAS; requested_virtual_sensors[4].sample_rate = sample_rate; requested_virtual_sensors[5].sensor_id = BSEC_OUTPUT_RAW_TEMPERATURE; requested_virtual_sensors[5].sample_rate = sample_rate; requested_virtual_sensors[6].sensor_id = BSEC_OUTPUT_RAW_HUMIDITY; requested_virtual_sensors[6].sample_rate = sample_rate; requested_virtual_sensors[7].sensor_id = BSEC_OUTPUT_STATIC_IAQ; requested_virtual_sensors[7].sample_rate = sample_rate; /* Call bsec_update_subscription() to enable/disable the requested virtual sensors */ status = bsec_update_subscription(requested_virtual_sensors, n_requested_virtual_sensors, required_sensor_settings, &n_required_sensor_settings); return status; } ... 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