Software Design
Designer Reference Manual
DRM028 — Rev 0
84
Software Design
MOTOROLA
Figure 5-4. Main Software Flowchart
In the
Stand-By
state function, the start/stop switch is checked using
StSWReadStart ()
function. The
DecideStaSto ()
function is called to
decide if the application should start. The start condition differs if manual
or PC master software mode is set. When in manual mode (
PCMode
=
0), the start condition is the switch in the start position. When PC master
software mode (
PCMode
= 1), the start condition is a start request from
PC master software (
StartCtrl
= 1). In both modes,
Stop_F
is cleared
when the software evaluates the start condition. When
Stop_F
is
cleared, the software checks the over-voltage condition and the
application starts.
The system
Alignment
and
Starting (Back-EMF Acquisition)
states
are provided by
Alignment()
and
Start ()
functions in the
code_start.c
file, both are called from
main()
. The functionality during the start and
running state is described in
3.3.1 Sensorless Commutation Control
.
During the starting (back-EMF acquisition) state, the commutation time
RESET
MCU INITIALIZATION:
– SYSTEM REGISTERS INITIALIZATION
– PORTS INITIALIZATION
– PLL — CPU CLOCK INITIALIZATION
– PC MASTER SOFTWARE (PORT)
INITIALIZATION
APPLICATION INITIALIZATION:
– CURRENT OFFSET CALIBRATION
– SYSTEM REGISTERS INITIALIZATION
– PWM INITIALIZATION
– TIMER 1 CURRENT SENSING TO PWM
SYNCHRONIZATION
– ADC MEASUREMENT INITIALIZATION
MAIN S/W LOOP:
– SEE
FIGURE 5-5
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..
