The Reasearch Of Data Acquisition System Based On MSC1210 PCM Embedded System

With the development of information technology, and signal processing technique, it has become an important way to process, save and transmit any kind of signal by digitalization.Data acquisition technology toward multi-path, intelligent, high speed, low power consumption and other direction. Strong motion seismograph is to record the strong ground motion, which happened near the strong earthquake, and to be triggered automaticly. Strong motion seismograph require large dynamic range, high resolution, high stability, it should be easy to operate, easy-to-network connection, record and storage. Digital technology and embedded technology is the new trend for the development of strong motion seismograph.Now a lot of Electronic engineers who design real-time embedded system have have great interest in the kernel ofμC/OS-II for stable capability , free sound code and the advantage of clear structure. BecauseμC/OS-II is a embedded real-time operation system,it has been repoted on lots of MCU, MPU and SoC.μC/OS-II has widely used and plays a very important role in many fields, such as industry control, Intelligent transportation, automotive electronic,GPS, and civil living.The instrument adopts MSC1210 of TI (Texas Instruments) Co. as MCU and it is a completely integrated family of mixed-signal devices incorporating a 24-bits no missing codes delta-sigma ADC. The Instrument has eight channels. There are 1,2,4,8,16,32,64,128 eight selectable gains provided at the input end of every channel in the device. According to the gain, the voltage can be set independently from the lowest 40mV to the highest 5V. The data is transmitted to computer by RS-232 interface.The text has introduced the trait ofμC/OS-II and the structure of kernel. The kernel ofμC/OS-II is discussed the task scheduling ofμC/OS-II and the interrupts underμC/OS-II are analyzed,μC/OS-II's clock tick ofμC/OS-II is described too. Base on the sufficient cognition ofμC/OS-II's elements, there is bat around the transplant process ofμC/OS-II on Single Chip Micyoco of MSC1210, which includes 3 files would be reworked: OS_CPU.H,OS_CPU_A.ASM and OS_CPU_C.C. The article also describes how to create A/D conversion task and other tasks.Finally, the text introduced some ways to design reset circuit and low power circuit.