Software Design
Data Flow
DRM028 — Rev 0
Designer Reference Manual
MOTOROLA
Software Design
77
Type:
S8- signed 8 bit, U8- unsigned 8 bit, S16- signed 16bit, U16-
unsigned 16bit, (union)- 16 bits access or 2*8bit access
The system registers
Sys1
flags are described by definitions of
Sys3_Def:
typedef union
{
struct
{
unsigned int PC_F : 1; /* BIT0 Phase Commutation Flag */
unsigned int Off_F : 1; /* BIT1 Offset timeout flag
- Offset timeout can be measured */
unsigned int ICR_F : 1; /* BIT2 Input Capture
was succesfuly Received - Flag */
unsigned int Rmp_F : 1; /* BIT3 Speed Ramp Flag - motor
ramping */
unsigned int Stop_F : 1; /* BIT4 Motor is going or is
stopped */
unsigned int Strt_F : 1; /* BIT5 Start Phase Flag */
unsigned int Run_F : 1; /* BIT6 Motor Running with
back-EMF feedback Flag */
unsigned int FOK_F : 1; /* BIT7 Feedback within the righ
time Flag */
} B;
/*
|FOK_F|Run_F|Strt_F|Stop_F|Rmp_F|ICR_F|Off_F|PC_F| */
char R;
} Sys1_Def; /* System register #1 Definition */
Main data flow is displayed in
Figure 5-1
. The processes are described
in the following subsections.
5.3.2 Process Measurement
The process provides measurement of analog values using ADC. The
measured inputs are: dc-bus current, dc-bus voltage, and speed input.
The measurement is provided by the measurement handler. The state
diagram is explained in
State Diagram
.
5.3.3 Start/Stop Switch Reading and Start/Stop Decision
The process reads the start stop switch and provides start condition and
clear failure decisions, as explained in
Stand-By
and
Fault State
.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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