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Hi collier, I run BMP3 COINES example code "read_sensor_data", it works well and couldn't reproduce your issue. 0x1B register remained 0x33 value. Suggest you also run this example code and see it again. static void read_sensor_data(void) { int times_to_read = 0; uint8_t reg_value = 0; while (times_to_read < 200) { bmp3_get_sensor_data(BMP3_ALL, &bmp3_comp_data, &bmp3Dev); printf("T: %.2f, P: %.2f \n", (bmp3_comp_data.temperature / 100.), (bmp3_comp_data.pressure / 100.)); fflush(stdout); bmp3_get_regs(0x1B, & reg_value, 1, &bmp3Dev); printf("0x1B reg value=0x%02x\r\n", reg_value); reg_value = 0; coines_delay_msec(10); times_to_read = times_to_read + 1; } } ... View more

Hi, Thanks for your inquiry. Please note that BMP388 has been discontinued. You need to switch to BMP390 which is pin-to-pin compatible with BMP388 and share the same API source code at https://github.com/BoschSensortec/BMP3-Sensor-API. After BMP388 is powered on, it will stay in sleep mode. You need to enable pressure sensor and temperature sensor in register 0x1B. You also need to select oversampling for pressure sensor osr_p and temperature sensor osr_t in register 0x1C. The higher the osr_p and osr_t, the cleaner the data will be. But the conversion time and current consumption will be higher as trade-off. Then you need to select ODR for example 25Hz in register 0x1D if you want to use normal mode. Now you go back to register 0x1B and select normal mode. You should be able to see status register 0x03 drdy_temp bit and drdy_press bit set to 1. If not, then you need to set drdy_en bit in register 0x19. After you read pressure and tempeature data registers the status bits will be cleared. BMP388 forced mode is actually on demand or single-shot measurement. Your MCU can write value to register 0x1B to enable forced mode at any time. Then BMP388 will wake up from sleep mode and take a measurement and then go back to sleep mode automatically. You can check the status register 0x03 before reading the data registers. Because BMP388 and BMP390 need to run formula to get the final pressure value and temperature value from raw data and calibration data in NVM, it is recommended to use our API soruce code. You can click "Examples" on the Github to see how to get sensor data. Thanks.   ... View more