3.22EjemploDRM007 Co..

Software Design Considerations
interrupt handler is used for the speed control and continuous generation
of reference speeds, including positive and negative values, so the
agitator moves in both directions of rotation.
5.9.1.5 Spin CW and Spin CCW
When the Spin process is selected in either direction, the motor
initialization is called, and then an acceleration ramp is loaded from a
Spin look up table, and the sign of the reference speed is set according
to the direction of rotation selected.
5.9.1.6 Fixed Reference Speed
When the acceleration ramp table of the Spin process is fully loaded, the
reference speed remains constant.
5.9.2 InitPLL(void)
This function is called once in the application. It sets the bus frequency
to 8 MHz with an external crystal of 4 MHz.
5.9.3 InitPWMMC(void)
This function initializes the PWM module for motor control with the
following settings:
• PWM frequency of 15.625 kHz
• Two microseconds of deadtime
• Reload every PWM cycle
5.9.4 InitTimerA(void)
Timer A and timer A channel 1 are initialized for speed control and
commutation control. The overflow interrupt is enabled for speed control
each millisecond. Channel 1 is configured as an input capture channel
with interrupt enabled on any edge. This channel is connected to Hall
sensor A.
DRM007
BLDC Motor Control Board for Industrial and Appliance Applications
90 Software Design Considerations MOTOROLA