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28335的I2C问题

在调试28335的I2C通信问题时,遇到一个很奇怪的问题。当正常执行自己根据例程改写的I2CEEPROM的程序时,程序总是无法进入中断,导致一直读不出数据。但是自己先将之前用I/O口模拟的I2C时序的程序仿真运行一下,再仿真运行自己的EEPROM程序时,程序正常运行。感觉很奇怪,又查不出原因,恳请各位指点迷津!