Design on PCIe Real-time Measurement and Control Platform for MEMS Gyroscope

Abstract

This paper introduces a PCIe (PCI Express) real-time measurement and control platform for MEMS (Micro-Electro-Mechanical System) gyroscopes. Through optimization of the PCIe and FPGA (Field Programmable Gate Array) drivers as well as the delay link, the platform realized the closed-loop control of gyroscope in both the driving frequency and amplitude. Consequently, the linear vibration gyroscope could work at the resonant frequency and the amplitude was stable. Considering the real-time performance of the platform and stability of data transmission, analysis from the aspects of software and hardware are presented here. For the PCIe bus transmission, the hardware of FPGA was optimized. The readout time of single data was reduced to 1.8 μs by accelerating controls of bus transmission and PCIe IP core interface. For the system software, the underlying driver and algorithm were streamlined so that the data transmission delay between kernel layer and user layer was decreased. The development of highly-efficient timing control proposal ensured stabilization in data transmission. The proposed platform could reach a 100 kHz sampling and processing rate in PC system, which is enough for the current requirements. Furthermore, the proposed high-rate real-time platform can also be used in more real-time high-demanding systems.