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TFP410用I2C没响应

芯片供电没问题,都是3.3V。我把RST脚拉高,让芯片工作在I2C模式下,然后我向芯片写命令,返回的ack并不是0,这个I2C程序在其他芯片上工作正常,我觉得应该也不是程序的问题,想问下是哪里还没配置好吗,谢谢!