PIC16F877的多任务 Salvo™ RTOS

ThisapplicationnotecoversaReal-TimeOperating

System(RTOS)runningonaPIC16F877.Theapplica-

tioniswritteninCusingtheHI-TECHCcompiler.

MPLAB

®

IDEisusedastheIntegratedDevelopment

Environment.ThisRTOSisunique,inthatitisintended

formicrocontrollerapplicationswherememoryis

severelylimited.Theapplicationrunsonaprototype

PCBthatmonitorstemperature,acceptsuserinputand

displaysimportanttemperatureinformation.MAN777Multi-TaskingonthePIC16F877withtheSalvoRTOSAuthors:ChrisValentiSYSTEMDESCRIPTIONMicrochipTechnologyInc.Theprototype'shardwareincludesa20MHzcrystal,fourthermistors,fourpotentiometers,aserialport,AndrewE.Kalman,Ph.D.EEPROM,four7-segmentLEDs,16-buttonkeypadPumpkin,Inc.andapiezobeeper.Thephrase,“normalconditions,”willbeusedfrequentlyinthisapplicationnote,indicat-INTRODUCTIO