BISS-C protocol sensor data analysis and extraction method based on DSP

Abstract

The invention discloses a BISS-C protocol sensor data analysis and extraction method based on a DSP, and aims to solve the problems that the cost of reading position signals by adopting an FPGA or a special BISS-C chip is high, a data clock is discontinuous due to DSP analysis, and the DSP analysis cannot be suitable for any sensor with a BISS-C protocol. According to the invention, through the SPI sending FIFO module, the problem of data clock discontinuity is solved; by utilizing the characteristics of a data start bit, the problem that the bit length of an Ack segment is inconsistent due to different photoelectric encoders and different SPI baud rates is solved. According to the method, the data with the BISS-C protocol can be directly decoded only by adopting the SPI module of the DSP, so that servo control on the motor with the BISS-C protocol position sensor can be completed only by adopting the DSP chip. The control software program of the rotary table of the photoelectric encoder with the 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 high-precision turntable control requirements, the position sensors of most turntables now use up to 26-bit or even 32-bit photoelectric encoders, and most photoelectric encoders use the BISS-C protocol to exchange data with the data receiving system. [0003] In the current prior art, the solution generally adopted is to decode the BISS-C data through FPGA or a dedicated BISS-C chip and then transmit it to the main control chip for drive control. 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 ti...

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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