由于stm32的硬件iic的BUG比较多，采用模拟iic的方式读取bme280模块的数据，IIC模拟时序和BME280都写好了,只需要对输入输出引脚进行修改即可，数据通过串口打印输出，方便移植。(Because there are many bugs in STM32's hardware IIC, the data of bme280 module is read in the way of analog IIC. The IIC analog timing and bme280 are wr