iic主机程序，记得端口硬件要上拉电阻，不拉是不行的，我这是用瑞萨单片机做的，大家可以用其他单片机试，我在avr上做成了-IIC host program, remember port hardware to the pull-up resistor, do not pull is not good, I this is to use Renesas MCU do, you can use other chip, on my AVR I made