HAL_Components - rmu75/linuxcnc-wiki GitHub Wiki

date: '2010-10-31T00:24:32' title: HAL Components

This page is to explain how HAL logic components work and are used

for us non-electrical engineers.

Anyone that can add to this page it would help...

Contents

toc

1. and2

1.1. Description

The and2 is an AND gate. Two inputs must be on for the output to be on. upload:and2.jpg

1.2. Examples

To use and2 you have to create one or more as needed with

loadrt and2 count=1

If you want to link it to a thread like the servo thread use this

 addf and2.0 servo-thread

To use it link two pins to the inputs like this

net mypin01 parport.0.pin-01-in and2.0.in0

net mypin02 parport.0.pin-02-in and2.0.in1

The output will be on when both pins are on.

net my-thing and2.0.out

2. match8

2.1. Description

Match8 is an interesting one. If the pattern match between a and b are the same then out is on.

2.2. Examples

if match8.N.a0 and match8.N.b0 are on then out will be on.

3. mux2

3.1. Description

A Selector Switch for two float values

upload:mux2.jpg

3.2. Examples

4. mux4

4.1. Description

A Selector Switch for four float values The sel0 and sel1 form a binary pattern to select the input wanted at the output. upload:mux4.jpg

4.2. Examples

5. not

5.1. Description

Not simply inverts the input. If the input is on the output is off, if the input is off the output is on. upload:not.jpg

5.2. Examples

6. or2

6.1. Description

or2 is an or gate. If either in is on out is on. If both are on the output is on. upload:or2.jpg

6.2. Examples

7. xor2

7.1. Description

xor2 is slighly differet from an or gate in that if both inputs are on the output is off. If either input is on the output is on. upload:xor.jpg

7.2. Examples

8. Signals

-not means that you're using the inverted value, so that a low voltage on the physical pin produces a TRUE value inside HAL (instead of "positive logic" where a high voltage on the physical pin produces a TRUE value)

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