Motor control-oriented trigonometric function coprocessor based on RISC-V architecture

Abstract

The invention discloses a motor control-oriented trigonometric function coprocessor based on an RISC-V architecture. The motor control-oriented trigonometric function coprocessor comprises a coprocessor interface and a trigonometric function calculation unit, the trigonometric function calculation unit comprises a compression angle unit, an iteration angle calculation unit, a fixed point number and floating point number conversion unit, a scaling factor updating unit, a scaling factor compensation unit, a post-processing unit and a ROM (Read Only Memory) for storing data. The coprocessor interface comprises a decoder and a data interface module, and the decoder decodes a coprocessor instruction to judge whether the instruction belongs to the coprocessor instruction and reads required data according to the instruction; and the data interface module performs data synchronization. The trigonometric function coprocessor is designed by designing a trigonometric function instruction, designing a state machine for coprocessor state conversion and designing a trigonometric function calculation unit, the requirements of an embedded microprocessor for performance, area and power consumption can be met, and the execution efficiency of a motor control algorithm is effectively improved.

Description

technical field [0001] The invention relates to the fields of motor control and transcendental function calculation, and particularly designs a trigonometric function coprocessor based on RISC-V architecture for motor control. Background technique [0002] With the continuous development of modern technology, fast and low-power calculation of a large number of trigonometric functions has become an urgent problem to be solved by current motor control MCUs. [0003] Different from general computing platforms such as servers and PCs, embedded microprocessors based on RISC-V instruction architecture pay more attention to design factors such as low cost, low power consumption and real-time performance. The performance, area and power consumption of the processor must be considered as the optimization goals. For general embedded microprocessors, transcendental functions such as trigonometric functions are generally calculated by calling software. However, if a large number of tr...

AI Technical Summary

Problems solved by technology

However, if a large number of trigonometric functions need to be calculated, it is difficult to meet the real-time requirements of embedded microprocessors by calling software to calculate trigonometric functions.

However, it is difficult to meet the conditions for the embedded microprocessor with limited resources by using the look-up table method to obtain the trigonometric function results.

Images