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请问用TMS320C5515的GPIO口模拟I2C总线需要接外部上拉电阻吗？需要的话阻值为多少比较合适呢？
GPIO管脚应该不是open drain的，你可以试试弱上拉。
另外，c5515本身有I2C口。
好的，非常感谢
