AN1914 Freescale Semiconductor / Motorola, AN1914 Datasheet - Page 34

• Manufacturer Part Number: AN1914
• Description: 3-Phase BLDC Motor Control with Sensorless Back EMF Zero Crossing Detection Using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

SW Design
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ADC complete ISR:
Application State Machine:
precedes/sets requirements of:
Commutation Control
proceed Status_Commutation:
Omega Required Mechanical
Drive Fault Status
Application Mode
Control Speed
Control Alignment Current
read Temperature
set Current Control Rq
Check Run/Stop Switch
Running
Starting
Alignment
Stopped
DC bus Voltage/Current
Interrupt
ADC complete
DSP56F80x MC PWM Module in Motor Control Applications
Initialize
Figure 7-1. Main Software Flow Chart - Part 1
Reset
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Speed/Alignment Timer OC ISR:
PWM Reload ISR:
Commutation Timer OC ISR:
set Speed Control Request
Alignment stage timing
Motor Commutation Timing
Commutate. Control Proceed
Zero Crossing Setting
start ADC
memorize sampling time
evaluate Zero Crossing
Interrupt
OC Cmt2Timer
Interrupt
PWM A Reload
Interrupt
OC Cmt Timer
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