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1 Anonymous Users
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請問AN900範例的問題
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資深會員
 
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READ_SPEED_FEEDBACK movf VELRL, W addwf VELOCITY_LOW, F<==抓到VELRL值為什麼要做addwf?? movf VELRH, W addwfc VELOCITY_HIGH, F<==抓到VELRH,值為什麼要做addwfc?? bcf STATUS, C rrcf VELOCITY_HIGH, F <==為什麼要左移做除2動作?? rrcf VELOCITY_LOW, F<==為什麼要左移做除2動作?? incf VELOCITY_COUNT btfss VELOCITY_COUNT, 4 <==;Average 16 times, before setting the feedback update flag 不懂這用意是什麼 bra velocity_done clrf VELOCITY_COUNT bsf FLAGS1, FEEDBACK_UPDATE bcf PIE3,IC1IE velocity_done bcf PIR3,IC1IF RETFIE FAS ；**************************** CALCULATE_ROTOR_FREQUENCY movlw 0x12 movwf AARGB0 movlw 0x6C movwf AARGB1 movwf 0xCC movwf AARGB2 movff VELOCITY_HIGH, BARGB0 movff VELOCITY_LOW, BARGB1 call FXD2416U movff AARGB1, ROTOR_FREQUENCY_UPPER movff AARGB2, ROTOR_FREQUENCY_LOWER return 以上程式計算出來的值是轉子頻率?還是轉速值? 這部份看不懂QQ CALCULATE_ROTOR_FREQUENCY Based on Timer5 period of .2usec and (2048 QEA edge transitions)/revolution ROTOR_FREQUENCY = 20400d/QEAperiod = 4FB0h/(VELRH:VELRL) 上面的計算式ROTOR_FREQUENCY 20400d值是如何得知?? 謝謝
發表於: 2006/12/13 22:37
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