/** * @brief This function read the pin's input/output level. * @param[in] pin - the pin needs to read its level * @return the pin's level(1: high 0: low) */ static inline unsigned int gpio_read(GPIO_PinTypeDef pin) { return BM_IS_SET(reg_gpio_in(pin), pin & 0xff); }

以上函数，尝试读取PD7的时候，高电平返回的不是1，而是0x80，函数说明是否可以更严谨一些