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TMS320F280025C: I2C模块

Part Number: TMS320F280025C

在使用I2C模块时,在I2C模块一使能繁忙标志便被置位(I2CSTR.bit.BB = 1),检查电平发现SCL和SDA均为低电平,后通过断点测试发现GPIO一旦复用为I2C引脚SCL和SDA便跳变为低电平,测试过先使能I2C时钟再配置引脚再配置外设,(多次试验 时钟/外设/引脚先后先后配置顺序对结果并无影响)。未使用例程代码,但是相同的代码在F280049C上运行正常,对比过280025C和280049C无太大差异.  求助求助