Development of precise rotation angle measurement system based on TMS320X2812

An angular displacement test system is designed, which uses circle grating as a sensing component,and TMS320X2812 DSP as a core. The construction, and operation principle of the circle grating are also presented in detailed. QEP unit which integrated in DSP chip can be used to subdivide orthogonal pulse by 4 times and discern direction.The measurement results are displayed in computer.The system realized precision measurement on angular displacement.