High-speed Cam Mechanism Signal Sampling System Based on USB and DSP

According to the limitation of old signal sampling system which was used in cam mechanism in teaching experiment,designed a high-speed signal sampling system based on USB2.0 and DSP.The hardware circuit of the system included signal acquisition circuit,counting circuit of photoelectric coded disk,signal processing circuit and USB interface circuit.Signal processing circuit used TMS320F28335 as the master chip to process signal.TMS320F28335 is a 32-bit floating-point DSP.Processed data was sent to USB interface circuit by using SPI-bus.USB interface circuit included FPGA and CY7C68013.The serial data was converted into a certain format by FPGA,the converted data was sent to personal computer by CY7C68013 to display and storage.The software of the system included PC application program,USB communication program and digital signal processor programming.By using the hardware circuit and software,the system can sample speed signal of a cam mechanism.