Stm8 I2C总线硬件I2C设备,总线挂载4片单片机，均为Stm8单片机,每一片单片机都可以做主从切换,测试可以正常通信。-Stm8 hardware I2C bus mount four I2C devices, are stm8 microcontroller, every piece of single-chip computer can make decision　the switch, the test can normal communication.