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| Temperature Sensor Measurement |
;5) Read Temp Sensor Again |
| ; Read Sensor value | |
bsr | ReadSensor |
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;6) Dead time control |
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StartTimer |
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;7) During the dead time, update dead time period every 128ms | |||
brclr | SRTISC_RTIF, MAP_ADDR_6(SRTISC), UpdateLater; Update PWM duty cycle | ||
jsr | TableLookup |
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UpdateLater: | ActualPeriod |
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lda | ; |
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sub | TargetPeriod |
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blo | IncPeriod | ; if same, Fan speed reach target then exit | |
beq | WaitAgain | ||
DecPeriod: | DeadTime | ; if bigger, decrement DeadTime | |
lda |
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cmp | #MinDeadTime |
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blo | WaitAgain |
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dec | DeadTime |
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bra | WaitAgain |
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IncPeriod: | DeadTime | ; if smaller, increment DeadTime | |
lda |
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cmp | #MaxDeadTime |
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bhs | WaitAgain |
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inc | DeadTime |
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bra | WaitAgain |
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WaitAgain: |
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;8) Bump COP | MAP_ADDR_6(SRS) | ; Bump COP | |
sta | |||
wait | #(mMTIMSC_TSTPmMTIMSC_TRST), MTIMSC; mask interrupt and clear flag | ||
mov | |||
;9) Repeat the control cycle
bra FanControlLoop
;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
;Delay 16ms ;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Delay:
mov | #255, MTIMMOD | ; OF period |
mov | #(mMTIMSC_TRSTmMTIMSC_TOIE), MTIMSC; Reset and Start Timer | |
wait | #(mMTIMSC_TSTPmMTIMSC_TRST), MTIMSC; mask interrupt and clear flag | |
mov | ||
sta | MAP_ADDR_6(SRS) | ; Bump COP |
rts |
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;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
;Drive coil
Variable Speed DC Fan Control using the MC9RS08KA2, Rev. 0
Freescale Semiconductor | 29 |
