• IEMEK Journal of Embedded Systems and Applications
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• v.12 no.2
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• pp.89-96
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• 2017

We develop an embedded system to measure various sensor data, control multiple motors, and communicate with mobile devices for system managements. Choosing TI AM3359 microprocessor featuring high processing performance, low power consumption, and various I/O device support, we design and build the embedded system hardware so that it supports multiple global positioning system (GPS) and gyro sensor modules to measure precise position; multiple pulse width modulation (PWM) outputs to control multiple direct current (DC) motors; a Bluetooth module to communicate with mobile devices. Then, we port the boot loader and device drivers to the built circuit board and construct the firmware development environment for the application programming. The performance of the designed and implemented embedded system is demonstrated by real motor control test using GPS and gyro sensor data and control parameters configured by a mobile device.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.4
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• pp.83-90
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• 2004

In this paper, we proposed a new instruction set(X32Y ISA) with 3 different types of instruction mode. The proposed instruction set organizes 32-bit, 24-bit, 16-bit instruction in order to solves a problem of memory size limitation in an embedded microprocessor. We designed a 32-bit 5 stage pipeline RISC microprocessor based on the X32V ISA. To verify the proposed the X32V ISA and a microprocessor, we estimated a program code size of multimedia application programs using a X32V simulator. In result, we verified that the Light mode and the Ultra Light mode obtains 8%, 27% reduction of a program code size through comparison with the Default mode. The proposed microprocessor was verified all X32V instructions execution at Xilinx FPGA with 33MHz operating frequency,

• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.193-196
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• 2001

In this paper we designed CAMC-SP, the microprocessor embedded 2-axis motor control chip which controls a precise pulse motor by generating the pulse needed to control step motor, DC servo and AC servo motor. This design enables to decrease costs and to minimize a size. First we designed risc type 8-bit microprocessor compatible with PIC16C84, second we designed pulse motor controller. CAMC-SP is integrated of those two block. We designed CAMC-SP by VHDL and we testified to the Performance of it by performing functional simulation.

• Journal of the Korea Society of Computer and Information
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• v.22 no.5
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• pp.11-19
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• 2017

In this paper, we propose a hypervisor for embedded systems based on ARM microprocessor. The proposed hypervisor makes it possible to run several real-time kernels concurrently on a single embedded system by virtualizing its microprocessor. With assistance of MMU, it supports virtual memory which enables each guest operating system has its own address space. Exploiting the fact that most embedded systems use memory-mapped I/O device, it provides a mechanism to distribute an external interrupt to virtual machines properly. It also achieves load balancing through live migration which moves a running virtual machine to other embedded system. Unlike other para-virtualization techniques, minor modifications are needed to run it on the hypervisor. Extensive performance measurement studies are conducted to show that the proposed hypervisor has enough potentiality of its real-world application.

• Journal of the Korea Society for Simulation
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• v.15 no.4
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• pp.51-58
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• 2006

Debugging embedded softwares is very different from debugging general softwares. For examples, debugging embedded software requires more information, such as information on power consumption, information on the distribution of executed instructions, information on the distribution of used registers, and information on the amount of clocks consumed during the execution of a program, that is not needed in debugging general softwares. In this paper, we propose more effective method fer debugging embedded softwares using an instruction set simulator for the microprocessor that is executing embedded softwares. In this research, we develop a debugger based on an instruction set simulator for a domestic embedded microprocessor called SE1608 and we shows an effective debugging method using a MiBench program which is widely used to benchmark embedded softwares. The debugging method proposed in this paper is relatively easy to implement and shows many advantages compared with existing debugging methods.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2006.05a
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• pp.302-308
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• 2006

We introduce the concept of a remote distributed embedded system to integrated fieldbus based control systems in internet/Intranet. As a result fieldbus systems are opened up for remote monitoring, remote maintenance, and remote control applications using state of the art Web-technology. This paper addresses the design of a remote distributed embedded system using Internet and CAN for multi-Induction motor of Building and Industrial field. The fieldbus used the CAN based networked intelligent multi-motor control system using DSP2812 microprocessor. To build such a system, the TCP/IP-CAN Gateway which convert a CAN protocol to TCP/IP protocol and vice verse, was designed. A experimental simulation system consists of a TCP/IP-CAN Gateway in remote place and a command PC ti be connected ti Ethernet.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.18-20
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• 1998

본 논문에서는 RISC Microprocessor Core 설계에 대한 기반 기술을 확립하여, GPS(Global Positioning System) 같은 Embedded 시스템 등에서 주로 사용되어 지고 있는 ARM사의 ARM7 CPU와 이진 호환이 가능한 Microprocessor를 설계하고자 하였다. 이를 위하여 RISC Microprocessor의 기본적인 구조를 바탕으로 하여 ARM7 CPU와의 호환을 위하여 ARM7 CPU의 명령어들이 주어진 Clock안에 수행될 수 있도록 설계를 하였고, 여러 모듈을 원활히 공유할 수 있도록 내부에 공유 버스를 설계하였다. 설계를 위해서 Verilog-HDL(Hardware Description Language)을 사용하였으며, Microprocessor를 기술하는데 있어서 Behavioral 구조와 RTL(Register Transfer Level) 구조를 혼합하여 사용하였다. 설계된 Microprocessor의 동작은 면적과 타이밍의 최적화를 거친 후 Cwaves 툴을 사용하여 실질적인 ARM7의 명령어들을 수행하면서 검증하였다.

• 전기의세계
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• v.41 no.5
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• pp.14-19
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• 1992

Microprocessor의 성능은 향상되는 반면 관련 hardware의 가격은 계속 하락하고 있다. 따라서 자동화 기기와 같은 특수기기내에서 microprocessor관련 hareware의 비용이 전체기기의 가격에서 차지하는 비중이 점차로 줄어들고 있고 이와 같은 기기류에 32bit microporcessor와 같은 고성능의 hardware를 장착하는 경우가 늘고 있다. 그러나 이에 걸맞는 software의 제작은 결코 쉬운 일이 아니다. 이와같은 고성능의 기기에 필요한 적절한 software의 제작 및 유지보수를 위해서는 반드시 적절한 개발환경이 필수적이라고 할 수 있다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.8
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• pp.1422-1427
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• 2006

In order to estimate the power consumed by an embedded microprocessor during an execution of software, we measure and utilize the current consumed by the processor during the execution of each instruction. In this paper, we measure and analyse the current consumed by the microprocessor adc16s310 during the execution of arithmetic and logic instructions, and propose a power estimation model which estimates the current for all instruction executions precisely by using a small numbers of current measurements. The proposed model can estimate the current with an average 0.34% error by using only 5.84% of total current measurements for arithmetic and logic instructions of the processor.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.723-728
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• 1999

In this paper, we designed a Circular Path Built-In Self Test circuit and embedded it into a simple 8-bit microprocessor. Register cells of the microprocessor have been modified into Circular Path register cells and each register cells have been connected to form a scan chain. A BIST controller has been designed for controlling BIST operations and its operation has been verified through simulation. The BIST circuit described in this paper has increased size overhead of the microprocessor by 29.8% and delay time in the longest delay path from clock input to output by 2.9㎱.