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TM4C123G 外设库函数I2C数据写不进DATA寄存器

Other Parts Discussed in Thread: TM4C123GH6PM

在执行了I2CMasterDATAPUT(I2C0_BASE,'Q')之后 看MDR寄存器,  显示都是0 ,为什么就写不进去呢,, 我看文档例程就这样写的啊