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HCCI or CAI engine technologies require an accurate combustion monitoring and control because there is no direct ignition trigger. The control of ignition is inherently more difficult than in standard internal combustion engines and needs additional sensors such as cylinder pressure to perform closed loop combustion control. In this paper we present a rapid prototyping platform dedicated to high frequency recording and processing. We illustrate the functionalities of the platform through an example of combustion parameters estimation from indirect measurement (knock sensor). The paper ends with a comparison of direct and indirect combustion parameters computation in real time for closed loop combustion control purpose. The presented results are carried out with knock data series recorded on HCCI and CAI engines.