id总是0 -len数据字节数 返回 string收到的数据 例 id = 0 sda = 1 scl = 2 –initialize i2Cj set pinl as sdOj set pin2 as scL i2c.setup(id, sda】 scl, i2c.SL0W) –user defined function: read from reg_addr content of function read_reg(dev_addr, reg_addr) i2c ? start(id) 12c...