A dsp-based biss-c protocol sensor data analysis and extraction method

Abstract

The invention discloses a DSP-based BISS-C protocol sensor data analysis and extraction method, aiming at the high cost of using an FPGA or a dedicated BISS-C chip to read a position signal, and the use of DSP analysis to cause discontinuous data clocks and inability to apply any BISS-C chip. ‑C protocol sensor problem, the present invention solves the problem of discontinuous data clock through the SPI transmission FIFO module; uses the characteristics of the data start bit to solve the Ack segment bit length caused by different photoelectric encoders and different SPI baud rates inconsistency problem. The method realizes that only the SPI module of the DSP can directly decode the data with the BISS-C protocol, so that only the DSP chip can be used to complete the servo control of the motor with the position sensor of the BISS-C protocol. The control software program of the rotary table of the optical encoder with BISS‑C protocol is greatly simplified, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of inertial navigation system calibration, in particular to a DSP-based BISS-C protocol sensor data analysis and extraction method. Background technique [0002] In order to meet the requirements of high-precision turntable control, most of the position sensors of the turntable now use photoelectric encoders with up to 26 bits or even 32 bits. Most of the photoelectric encoders use the BISS-C protocol to exchange data with the data receiving system. [0003] In the current prior art, a generally adopted solution is to decode the BISS-C data through an FPGA or a dedicated BISS-C chip and transmit it to the main control chip for driving control. Using an FPGA or a dedicated BISS-C chip would result in a higher cost for the entire turntable control scheme. In some other schemes, the PWM module of the DSP or the input IO port is used to simulate the MA signal in the BISS-C communication process, etc., such simu...

AI Technical Summary

Problems solved by technology

Using FPGA or dedicated BISS-C chip will lead to higher cost of the whole turntable control solution

In some other schemes, the MA signal in the BISS-C communication process is simulated by using the PWM module of the DSP or the input IO port. SPI is used to read, but because the time of the Ack segment of each photoelectric encoder BISS-C protocol is different, and SPI uses different baud rates, the number of bits in the Ack segment will also change accordingly, and the method is not suitable for BISS-C protocol, and if the SPI sending FIFO is not enabled, and the delay of the SPI sending FIFO is set to 0, the clock generated by the for statement is actually discontinuous, because the SPI sends one frame of data to the next data sending There will be a delay, which will lead to high DSP resource usage, and data reading will be jittery, and the accuracy will be poor

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