In order to improve the efficiency of embedded software running on processor core, this paper proposes a hard-ware/software co-optimization approach for embedded software from the system point of view. The proposed st...In order to improve the efficiency of embedded software running on processor core, this paper proposes a hard-ware/software co-optimization approach for embedded software from the system point of view. The proposed stepwise methods aim at exploiting the structure and the resources of the processor as much as possible for software algorithm optimization. To achieve low memory usage and low frequency need for the same performance, this co-optimization approach was used to optimize embedded software of MP3 decoder based on a 16-bit fixed-point DSP core. After the optimization, the results of decoding 128 kbps, 44.1 kHz stereo MP3 on DSP evaluation platform need 45.9 MIPS and 20.4 kbytes memory space. The optimization rate achieves 65.6% for memory and 49.6% for frequency respectively compared with the results by compiler using floating-point computation. The experimental result indicates the availability of the hardware/software co-optimization approach depending on the algorithm and architecture.展开更多
为提高造纸机真空部的自动化控制水平,提升造纸企业的成本控制能力,基于PLC和真空度传感器等硬件对变频器功率实施控制,进而实现对水泵和真空泵的动态调整,使水流量和变频器功率维持在较低水平,降低造纸机干燥部运行能耗。为实现该系统...为提高造纸机真空部的自动化控制水平,提升造纸企业的成本控制能力,基于PLC和真空度传感器等硬件对变频器功率实施控制,进而实现对水泵和真空泵的动态调整,使水流量和变频器功率维持在较低水平,降低造纸机干燥部运行能耗。为实现该系统的工业应用,提出了纸机能耗控制系统的主程序流程,同时采用WinCC(Windows Control Center,视窗控制中心)组态软件为上位机设计人机交互界面。该操作界面简洁美观、交互友好,可帮助车间工作人员实时掌握纸机真空部运行数据,合理调整真空部变频器运行功率,实现低能耗生产。展开更多
基金Project supported by the Key-Tech Program of Zhejiang Province,China (No. 021101559), and the Fok Ying Tong Education Founda-tion (No. 94031), China
文摘In order to improve the efficiency of embedded software running on processor core, this paper proposes a hard-ware/software co-optimization approach for embedded software from the system point of view. The proposed stepwise methods aim at exploiting the structure and the resources of the processor as much as possible for software algorithm optimization. To achieve low memory usage and low frequency need for the same performance, this co-optimization approach was used to optimize embedded software of MP3 decoder based on a 16-bit fixed-point DSP core. After the optimization, the results of decoding 128 kbps, 44.1 kHz stereo MP3 on DSP evaluation platform need 45.9 MIPS and 20.4 kbytes memory space. The optimization rate achieves 65.6% for memory and 49.6% for frequency respectively compared with the results by compiler using floating-point computation. The experimental result indicates the availability of the hardware/software co-optimization approach depending on the algorithm and architecture.
文摘为提高造纸机真空部的自动化控制水平,提升造纸企业的成本控制能力,基于PLC和真空度传感器等硬件对变频器功率实施控制,进而实现对水泵和真空泵的动态调整,使水流量和变频器功率维持在较低水平,降低造纸机干燥部运行能耗。为实现该系统的工业应用,提出了纸机能耗控制系统的主程序流程,同时采用WinCC(Windows Control Center,视窗控制中心)组态软件为上位机设计人机交互界面。该操作界面简洁美观、交互友好,可帮助车间工作人员实时掌握纸机真空部运行数据,合理调整真空部变频器运行功率,实现低能耗生产。
