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CCS V4中Include option的相对地址如何填写"${EXT_ROOT__Example_280xGpioToggle}/DSP280x_headers/include"

${EXT_ROOT__Example_280xGpioToggle}/DSP280x_headers/include"

红色部份是什么意思,我只知道这可能是相对地址的写法,但我还是不太清楚如何填写相对地址的格式,烦麻了解的给我讲解一下,谢谢!