Title :
DMA transfer method for wide-range speed and frequency measurement
Author_Institution :
Fac. of Electr. Eng., Belgrade, Univ., Serbia
fDate :
8/1/1993 12:00:00 AM
Abstract :
A frequency measurement method based on both pulse counting and time measurement during a constant sampling time is presented. The content of a free-running timer is transferred by a direct memory access (DMA) to a memory location after each rising edge of an input pulse, so the DMA transfer counter serves as a pulse counter. Several sources of measurement errors are discussed in detail. The DMA method is suitable for real-time speed control system with an integrated DMA controller
Keywords :
computerised instrumentation; frequency measurement; measurement errors; storage management; time measurement; velocity measurement; DMA; DMA transfer; constant sampling time; direct memory access; free-running timer; frequency measurement; integrated DMA controller; measurement errors; memory location; microcontroller; pulse counting; real-time speed control; speed measurement; time measurement; wide-range; Artificial intelligence; Clocks; Counting circuits; Frequency measurement; Microcontrollers; Pulse measurements; Registers; Sampling methods; Time measurement; Velocity measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
