static void I2C_AcknowledgePolling(I2C_TypeDef *I2Cx,unsigned char I2C_Addr){do{I2C_GenerateSTART(I2Cx,ENABLE);I2C_ReadRegister(I2Cx,I2C_Register_SR1);//清除ADDR位I2C_ReadRegister(I2Cx,I2C_Register_SR2);//I2C_Send