• 한국정보통신학회논문지
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• 제19권12호
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• pp.2820-2827
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• 2015

저가의 MCU를 사용한 HSMS 구동 시스템은 반도체 설비 온라인 시스템 구축에는 없어서는 안 될 필수적인 기술이다. HSMS는 더 빠른 속도의 통신이 필요하고 장비 하드웨어 구성이 용이한 어플리케이션을 위해 SECS-I 대신에 많이 사용된다. 기존의 SECS와 HSMS 디바이스는 SECS의 전반적인 프로토콜 구현되어 있어서 매우 고가이다. 이 연구에서는 기업에서 필요로 하는 SECS 프로토콜만을 지원하는 HSMS 통신 시스템을 설계하고 구현하고자 한다. 저가이지만 고성능 MCU를 메인 보드로 하여 HSMS 통신을 처리하는 모듈을 설계하고, BCR을 독립적으로 처리 할 수 있는 회로를 초소형 MCU를 이용하여 설계한다. 그리고 BCR로부터 인식된 태그 데이터를 HSMS 통신 프로토콜에 부합하는 데이터로 변환하기 위해 SECS-II 메시지를 설계한다. 이 설계들을 반영한 HSMS 통신 시스템을 개발한다. 개발한 저가의 HSMS 통신 모듈은 반도체 공정에 대한 실시간 감시 및 제어 시스템에 적용될 수 있다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 춘계학술발표대회
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• pp.5-6
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• 2019

보통 MCU를 기반으로 하는 임베디드 소프트웨어는 펌웨어 형태로 구현되어 콘솔이 없고, UART는 데이터 송신용으로 사용된다. 그러나 MCU 소프트웨어에 콘솔 드라이버를 구현하면 유닉스·리눅스와 같은 대화적 표준 입·출력 개발환경과 타스크 개념을 실현할 수 있다. 이 논문에서는 운영체제 교과에서 익힌 내용을 바탕으로 Atmega2560 MCU에 인터럽트 기반 콘솔 장치 구동기를 구현하고 실험한다.

• 정보과학회 논문지
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• 제43권6호
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• pp.692-699
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• 2016

세탁기, 냉장고 등의 가전제품에 탑재되는 8-bit MCU용 C 컴파일러는 소프트웨어 실행 속도를 높이기 위해 표준 C 언어 규칙을 따르지 않고 컴파일을 수행할 수 있다. 개발자가 일반 C 컴파일러와 8-bit MCU용 C 컴파일러의 차이를 정확하게 이해하지 못할 경우 표준 C 언어 환경에서는 발생하지 않으나 8-bit MCU를 사용하는 내장형 시스템에서는 발생하는 버그를 야기할 수 있으며 이런 버그는 표준 C언어 환경을 가정하는 버그 검출 도구로는 찾기 어렵다. 본 논문에서는 표준 C 정수 확장 규칙을 따르지 않는 8-bit MCU용 컴파일러를 사용할 때 발생하는 정수 확장 버그를 소개하고 정수 확장 버그를 탐지하기 위한 다섯 종류의 버그 패턴을 제안한다. 정수 확장 버그 패턴 검출 도구를 개발하여 LG전자 세탁기 소프트웨어를 분석한 결과 컴파일러 옵션을 잘못 선택한 경우 발생하는 27개의 정수 확장 버그를 발견하였다.

• 대한임베디드공학회논문지
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• 제11권2호
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• pp.97-105
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• 2016

Microcontrollers (MCUs) for endpoint smart sensor devices of internet-of-thing (IoT) are being implemented as system-on-chip (SoC) with on-chip instruction flash memory, in which user firmware is embedded. MCUs directly fetch binary code-based instructions through bit-line sense amplifier (S/A) integrated with on-chip flash memory. The S/A compares bit cell current with reference current to identify which data are programmed. The S/A in reading '0' (erased) cell data consumes a large sink current, which is greater than off-current for '1' (programmed) cell data. The main motivation of our approach is to reduce the number of accesses of erased cells by binary code level transformation. This paper proposes a built-in write/read path architecture using binary code inversion method based on hot-spot region detection of instruction code access to reduce sensing current in S/A. From the profiling result of instruction access patterns, hot-spot region of an original compiled binary code is conditionally inverted with the proposed bit-inversion techniques. The de-inversion hardware only consumes small logic current instead of analog sink current in S/A and it is integrated with the conventional S/A to restore original binary instructions. The proposed techniques are applied to the fully-custom designed MCU with ARM Cortex-M0$^{TM}$ using 0.18um Magnachip Flash-embedded CMOS process and the benefits in terms of power consumption reduction are evaluated for Dhrystone$^{TM}$ benchmark. The profiling environment of instruction code executions is implemented by extending commercial ARM KEIL$^{TM}$ MDK (MCU Development Kit) with our custom-designed access analyzer.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.396-401
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• 2017

In this paper, a device to analyze gait pattern was developed by using a 2-axis acceleration sensor attached to the foot. The 1st low-pass filter was adapted to limit the frequency band up to 5 Hz. An algorithm to detect the peak value exceeding the threshold voltage of an X-axis acceleration sensor and a Z-axis acceleration sensor was developed and normal and abnormal walking patterns were thus differentiated. Also, MCU and Bluetooth were combined to transfer the data to other MCUs to display on an LCD; the size of the device could then be reduced. The new algorithm and the device allowed the individual walking patterns to be easily measured at a low cost and with less restriction on activities compared to conventional multiple pressure sensors or motion camera system.

• 전기학회논문지P
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• 제56권3호
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• pp.117-122
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• 2007

In this paper, we described a design and implementation of a sensor node for environmental monitoring. The main focus of design for sensor nodes is to isolate MCU for treating sensors from the RF module for considering various communication environment. The second is to make the interface between MCU and varity of sensor. In addition, we choose a narrow band communication module, cc1020, for the admittance of Korea government communication law. We also use a uC/OS-II as an operating system which is famous for 8bit MCUs. We showed that the communication performance is sufficient to use the communication module in a out-door environment through several experiments in that it is possible to transmit between 100m distance through experiments in a mountain.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 학술대회 논문집 전문대학교육위원
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• pp.77-82
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• 2007

In this paper, we described a design and implementation of a sensor node for environmental monitoring. The main focus of design for sensor nodes is to isolate MCU for treating sensors from the RF module for considering various communication environment. The second is to make the interface between MCU and varity of sensor. In addition, we choose a narrow band communication module, cc1020, for the admittance of Korea government comminication law. We also use a uC/OS-II as an operating system which is famous for 8bit MCUs. We showed that the communication performance is sufficient to use the communication module in a out-door environment through several experiments in that it is possible to transmit between loom distance through experiments in a mountain.

• 한국산업정보학회논문지
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• 제19권2호
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• pp.51-58
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• 2014

As WSNs(Wireless Sensor Networks) are being deployed widely in diverse application areas, their management and maintenance become more important. Recent sensor node software takes modular software architectures in pursuit of flexible software management and energy efficient reprogramming. To realize an flexible and efficient modular architecture particularly on resource constrained mote-class sensor nodes that are implemented with MCUs(Micro-Controller Units) of a single address space. an appropriate module linking model is essential to resolve and bind the inter-module global symbols. This paper identifies a design space of module linking model and respectively their implementation frameworks. We then establish a taxonomy for module linking models by exploring the design space of module linking models. Finally, we suggest an implementation framework respectively for each module linking model in the taxonomy. We expect that this work lays the foundations for systematic innovation toward more flexible and efficient modular software architectures for WSNs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.1055-1056
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• 2006

This paper presents a remote dimming control method for the electrodeless lamps using 2.4 GHz RF communication. Since the proposed dimming method are implemented with a simplest open loop control using ISM band HF modem and low cost MCUs, and the remote controller has just several functions such as On/Off and duty ratio increasing/decreasing. It can be made with low cost. In this paper, the detailed digital logics of the proposed remote dimming control are described and the experimental results are presented.

• 대한임베디드공학회논문지
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• 제6권3호
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• pp.139-148
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• 2011

As the architecture of automotive software is complicated and LOC of software increases, there is an increasing demand for standard operating system. OSEK/VDX defines an industry standard for automotive operating system and middleware. This paper introduces an implementation of RTOS(OSCAR-OSEK) based on OSEK/VDX standard. For better speed of scheduling, we suggest a new method for ready queue implementation considering the characteristic of automotive application software. Also we introduce a method for improving the portability of RTOS on various MCUs. And, we show OSCAR-OSEK implementation and performance test results.