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先看看基本用法：
from pyb import I2C i2c = I2C(1) # create on bus 1
i2c = I2C(1, I2C.MASTER) # create and init as a master
i2c.init(I2C.MASTER, baudrate=20000) # init as a master
i2c.init(I2C.SLAVE, addr=0x42) # init as a slave with given address
i2c.deinit() # turn off the peripheral
i2c.init(I2C.MASTER)
i2c.send('123', 0x42) # send 3 bytes to slave with address 0x42
i2c.send(b'456', addr=0x42) # keyword for address
i2c.is_ready(0x42) # check if slave 0x42 is ready
i2c.scan() # scan for slaves on the bus, returning
# a list of valid addresses
i2c.mem_read(3, 0x42, 2) # read 3 bytes from memory of slave 0x42,
# starting at address 2 in the slave
i2c.mem_write('abc', 0x42, 2, timeout=1000) # write 'abc' (3 bytes) to memory of slave 0x42
# starting at address 2 in the slave, timeout after 1 second
I2C的用法：
bus，I2C总线的序号 i2c.deinit()，解除I2C定义 i2c.init(mode, *, addr=0x12, baudrate=400000, gencall=False)，初始化
. mode，只能是 I2C.MASTER 或 I2C.SLAVE .addr，7位I2C地址 .baudrate，时钟频率 .gencall，通用调用模式 i2c.is_ready(addr)，检测I2C设备是否响应，只对主模式有效 i2c.mem_read(data, addr, memaddr, *, timeout=5000, addr_size=8)，读取数据
.data，整数或者缓存 .addr，设备地址 . memaddr，内存地址 . timeout，读取等待超时时间 .addr_size，memaddr的大小。8位或16位 i2c.mem_write(data, addr, memaddr, *, timeout=5000, addr_size=8)，写入数据，参数含义同上 i2c.recv(recv, addr=0x00, *, timeout=5000)，从总线读取数据
. recv，需要读取数据数量，或者缓冲区 . addr，I2C地址 . timeout，超时时间 . send，整数或者缓冲区 . addr，I2C地址 . timeout，超时时间 |
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上层简单那，底层就麻烦
