Abstract: This application provides a secure boot apparatus and method. A control circuit in the secure boot apparatus can obtain boot code in a nonvolatile memory by using a non-programmable circuit, and verify the boot code by using a root of trust. In this way, even if the root of trust is not built in a processor, the verification on the boot code can be implemented by using the control circuit. This effectively reduces dependency of a secure boot process on processor performance. In addition, because the non-programmable circuit can be respectively coupled to the control circuit and the nonvolatile memory through two interfaces of different types, a requirement for the secure boot process on an interface protocol type of the control circuit is reduced, and application flexibility of a secure boot solution is improved.

Abstract: A human body composition measurement method includes a body fat measurement device that obtains measurement information. The measurement information includes weight information and impedance information. The impedance information is obtained by measuring a first segment of the measurement object and the body fat measurement device further determines second segmental body composition information of the measurement object based on the weight information, the impedance information, and first segmental body composition information.

Abstract: This application provides a blood oxygen detection method with multiple photoelectric detectors connected in parallel. The method includes: An electronic device determines, based on a plurality of pieces of detection data, a category of a scenario in which the electronic device currently performs blood oxygen detection, where the detection data is used for describing whether detection currents output by corresponding photoelectric detectors are abnormal, or the detection data is used for describing a current wearing state of the electronic device; and determines, based on the scenario category, to perform calculation based on a detection current output by at least one of the multiple PDs to obtain oxygen saturation.

Abstract: A method for periodically measuring blood oxygen saturation is disclosed. The electronic device includes a red light R path and an infrared light IR path, and the R path and the IR path each include a light emitting source and a photoelectric detector. The method includes: The electronic device receives a first instruction indicating to periodically measure blood oxygen saturation; performs, in response to the first instruction, dimming in a first blood oxygen measurement period if a user changes from a non-sleep state to a sleep state, where the dimming is used to determine that a light emitting power of the light emitting source of the R path and a light emitting power of the light emitting source of the IR path are respectively a first power and a second power.