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| − | Macros are sections of code that are repeated a number of times within a program.<br />
| + | For an excellent introduction guide, we recommend [https://www.flowcode.co.uk/education/ Introduction to microcontroller programming] |
| − | It is more efficient to use a macro than to create the code repeatedly every time it is needed.<br />
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| − | For more information about macros, see [[What Is a Macro?]]. | |
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| − | This exercise shows how to use macros with a menu to create a simple LED flasher. The LED can be made to flash at different frequencies by pressing different switches.
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| − | The first section looks at using 'Component Macros' to create the core timing sequence. The second section looks at using it to turn on a lamp for ten seconds once a switch is pressed.
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| − | __TOC__
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| − | ==The core timing sequence==
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| − | At the core of the program is a section that sets up the LCD to display the time.<br />
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| − | The flowchart sequence for displaying the elapsed time will be:
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| − | ::::* Initialize the LCD using the 'Start' macro.
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| − | ::::* Set the cursor position in the LCD, using the 'Cursor' macro.
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| − | ===Set up the flowchart===
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| − | * Open Flowcode, and set up the new flowchart as described in [[Exercise - Creating Your First Flowchart|Creating Your First Flowchart]].
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| − | ===Create the core sequence===
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| − | ===Add the LCD===
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| − | * Locate the 'LCD' inside the 'Outputs' toolbox in the [[Tools and Views#1) Icons Toolbar|Icons toolbar]].
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| − | :* Hover over the image to the left of the 'LCD' label, and click on the down-arrow that appears.
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| − | ===Add the switch===
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| − | * Locate the 'Push Round Panel' switch in the 'Inputs' toolbox in the [[Tools and Views#1) Icons Toolbar|Icons toolbar]].
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| − | :* Hover over the image to the left of the switch label, and click on the down-arrow that appears.
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| − | :* Click on the 'Add to system panel' option to select it.
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| − | :* Click on the image of the switch on the System panel to select it and drag it to a suitable position.
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| − | :* On the Panel Properties, click on the 'Unconnected' label, next to 'Connection'.
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| − | :: A pinout of the microcontroller appears.
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| − | :* Click on the rectangle that represents the pin RA1/AN1, to connect the switch to Port A, bit 1 of the microcontroller.
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| − | ===Add the LED===
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| − | * Locate the 'Single LED' in the 'Outputs' toolbox in the [[Tools and Views#1) Icons Toolbar|Icons toolbar]].
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| − | :* Hover over the image to the left of the 'Single LED' label, and click on the down-arrow that appears.
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| − | :* Click on the 'Add to system panel' option to select it.
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| − | :* Select the LED on the System panel and drag it to a suitable position.
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| − | :* Look at the Panel Properties, the 'Connection' property shows that, by default, it is connected to Port A, bit 0.
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| − | :: Leave it like this.
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