关键词: 异构双核, 真有效值, F28M35

Abstract: This paper introduces the concept and calculation principle of True Root Mean Square (TRMS), and expounds on how to use software algorithm to calculate TRMS. In this paper, a 32-channel analog signal TRMS acquisition system is described in detail, which is based on F28M35, a heterogeneous dual-core processor. Its C28 core focuses on data acquisition and TRMS algorithm processing, and its M3 core focuses on human-computer interaction, communication and other tasks. The two cores run independently, exchanging information through IPC without interfering with each other, and each has its own advantages. In addition, the paper introduces the hardware circuits, parameter settings, the functions of each software module, how the software and hardware work together, and the IPC communication mechanism between the cores, thus providing a more detailed description of the design of the acquisition system. This design leads to much lower system costs, higher technical level and  better adaptability.

Key words: heterogeneous dual-core processor, True Root Mean Square, F28M35