Motorola M68HC08 manual Software Design, Introduction, Data Flow, Control Technique

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Designer Reference Manual — Sensorless BLDC Motor Control

Section 5. Software Design

5.1 Contents

5.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.3 Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.4 Main Software Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

5.5 State Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

5.6 Implementation Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

5.2 Introduction

This section describes the design of the software blocks of the drive. The software will be described in terms of:

•Data Flow

•Main Software Flowchart

•State Diagram

For more information on the control technique used see 3.3 Used

Control Technique.

5.3 Data Flow

The control algorithm obtains values from the user interface and sensors, processes them and generates 3-phase PWM signals for motor control, as can be seen on the data flow analysis shown in Figure 5-1and Figure 5-2.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Software Design	75
	For More Information On This Product,
	Go to: www.freescale.com