motor_control_unit Entity Reference

Motor Control Unit. More...

Collaboration diagram for motor_control_unit:

Libraries
ieee
	Use Standard Library.

Use Clauses
std_logic_1164
	Use Logic Elements.

Generics
divider	integer := 125000
	Prescaler for PWM-signal.

Ports
clock	in STD_LOGIC
	component clock
reset_n	in STD_LOGIC
	resets the component
run	in STD_LOGIC
	chip enable
direction	in STD_LOGIC
	motor direction ('0' is left)
mode	in STD_LOGIC_VECTOR ( 3 DOWNTO0 )
	mode to run motor with
speed	in STD_LOGIC_VECTOR ( 2 DOWNTO0 )
	speed to run moter with
motor_pwm	out STD_LOGIC_VECTOR ( 3 DOWNTO0 )
	signal-bus for the motor pulse-width-modulation
motor_en	out STD_LOGIC_VECTOR ( 1 DOWNTO0 )
	both enable signals for the motor
steps	out STD_LOGIC_VECTOR ( 31 DOWNTO0 )
	number of steps motor did
ir	out STD_LOGIC
	IR signal set when motor stopped.

Detailed Description

Motor Control Unit.

Definition at line 44 of file motor_control_unit.vhd.

Member Data Documentation

divider integer := 125000

Generic

Prescaler for PWM-signal.

For this purpose 2,5 ms are used as minimal pulse-width.

The prescaler is calculated with the given and desired frequency via the following formula:

\begin{equation*} \text{prescaler} = \frac{f_{\text{clock}} \text{Hz}}{f_{\text{prescaler}} \text{Hz}} \end{equation*}

e.g.:

\begin{equation*} \left.\begin{aligned} f_{\text{prescaler}} &= \frac{5}{2}\,\text{ms} \newline &= 400\,\text{Hz} \newline\newline \text{prescaler} &= \frac{50\,\text{Mhz}}{400\,\text{Hz}} \newline &= 125000 \newline \end{aligned} \right\} \qquad \text{pulse-width: 2.5 ms} \end{equation*}

For simulation-purpose the divider was set to 125 for faster wave generation.

Definition at line 67 of file motor_control_unit.vhd.

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The documentation for this class was generated from the following file:

• motor_control_unit.vhd