ʾʹõԴ
I2C_SCL     ------ PB3
I2C_SDA     ------ PB4


ʾḶ́
1ϵϵͳʱӣRCHΪʱԴΪ48M
2ʼGPIOģI2C SCLSDA
3̣Ѱַд󣬷8ֽݣ
5̣ѰַͶ󣬽8ֽݣ


