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分析了以32位PowerPC微控制器MPC5554为核心的飞机二次配电设备的结构和功能,介绍了MPC5554中eQADC(增强型序列模数转换)模块的工作机制。针对MPC5554进行多路模拟信号采样数据存取量大的问题,提出了一种由eDMA辅助完成多路采样的方法,并以嵌入式操作系统μC/OS-Ⅱ为平台对多路采样实时任务进行了设计。飞机地面电网试验表明,该系统运行稳定可靠,能够实时准确采集多路信号,并显著提高了主CPU的效率。
The structure and function of the aircraft secondary distribution equipment based on the 32-bit PowerPC microcontroller MPC5554 are analyzed. The working mechanism of the eQADC (Enhanced Sequence Analog-to-Digital Converter) module in the MPC5554 is introduced. In order to solve the problem of MPC5554 large sample data access of multiple analog signals, a method of multi-sampling assisted by eDMA is proposed. Based on the embedded operating system μC / OS-Ⅱ, real-time multiplexed sampling Design. The test of aircraft ground power network shows that the system is stable and reliable, can collect multiple signals in real time and accurately, and significantly improves the efficiency of the main CPU.