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CC3200 配置GPIO, 运行时提示错误。

Other Parts Discussed in Thread: CC3200

请教一个大家问题,在配置GPIO引脚时,PIN17、PIN18、PIN20、PIN21。 只有PIN18可以配置成功, 其他3个,程序运行到配置代码处,就提示错误。 这是什么原因了?