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C-PHY has emerged as an interface alternative to D-PHY in MIPI camera applications. By decreasing toggle rate and increasing bandwidth, C-PHY offers systems designers more options for controlling EMI and power within a system, while maintaining high performance. However, testing C-PHY presents unique challenges, due to the need to monitor 3 lines simultaneously, as well as unique encoding and decoding methods. To address these challenges, UNH-IOL has created the C-PHY GUI tool. Similar to the widely used D-PHY GUI tool, C-PHY-GUI interfaces with oscilloscopes from various vendors. In this presentation, Paul Willis of UNH-IOL discusses the methodology behind C-PHY GUI, the challenges of building and testing it, and how to use it to easily test a C-PHY implementation.