AN1915D Freescale Semiconductor / Motorola, AN1915D Datasheet - Page 21

• Manufacturer Part Number: AN1915D
• Description: 3-Phase BLDC Motor Control with Quadrature Encoder using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

MOTOROLA
5.2.1 Initialization
The Main Routine provides initialization of the DSP:
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Disables Interrupts
Initializes DSP PLL
Disables COP and LVI
Initializes the POSIX Timer for a time base reference of 1ms
Initializes LED
Initializes the PWM module:
— Center-aligned complementary PWM mode, positive polarity
— PWM modulus - defines PWM frequency
— PWM deadtime - defines PWM deadtime
— Disable faults
Initializes Quadrature Decoder
— Sets the on-chip digital filter of the Quadrature Decoder inputs
— Connects Quadrature Decoder signals to Quad TimerA
Initializes Quad TimerA - channels A0
— set Count Mode to Quadrature Count
— set Input Source to Input 1
— set Input Polarity to Normal
— set Secondary Input Source to Input 0
— set CountFrequency to Repeatedly
— set Count Length to Past Compare
— set Count Direction to Down
— disable Capture Mode
— associate Callback On Input Edge to ISRQTimer
3-Phase BLDC Motor Control with Quadrature Encoder
Figure 5-3. State Diagram - General Overview
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(State Machine)
Initialization
Main loop
Reset
Interrupts
Software Design
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