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Stepper-Motor-Control  v3.0.0
System on a Chip 2014 - Group 04
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milestone3 Entity Reference

Milestone 3. More...

Collaboration diagram for milestone3:
Collaboration graph

Libraries

ieee 
 Use Standard Library.

Use Clauses

STD_LOGIC_1164 
 Use Logic Elements.

Generics

divider  integer := 125000
 Prescaler for PWM-signal.

Ports

CLOCK_50_B5B   in STD_LOGIC
 component clock
CPU_RESET_n   in STD_LOGIC
 resets the component
SW   in STD_LOGIC_VECTOR ( 9 DOWNTO0 )
 switch input
KEY   in STD_LOGIC_VECTOR ( 3 DOWNTO0 )
 key input
HSMC_RX_P   out STD_LOGIC_VECTOR ( 16 DOWNTO0 )
 Motor_pwm1( bit 0 ) and Motor_pwm2( bit 1 )
HSMC_RX_N   out STD_LOGIC_VECTOR ( 16 DOWNTO0 )
 Motor_pwm3( bit 0 ) and Motor_pwm4( bit 1 )
HSMC_TX_N   out STD_LOGIC_VECTOR ( 16 DOWNTO0 )
 Motor_en_a( bit 2 )
HSMC_TX_P   out STD_LOGIC_VECTOR ( 16 DOWNTO0 )
 Motor_en_b( bit 3 )
LEDG   out STD_LOGIC_VECTOR ( 7 DOWNTO0 )
 green leds
LEDR   out STD_LOGIC_VECTOR ( 7 DOWNTO0 )
 red leds

Detailed Description

Milestone 3.

Definition at line 35 of file milestone3.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 58 of file milestone3.vhd.


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