Differences

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--- glossary:glossary_i [2021/08/11 09:24] – [ICSP] WortingUK
+++ glossary:glossary_i [2022/01/26 10:42] – [Insulfrog] WortingUK
@@ Line 17: / Line 17: @@
 AVR ATMEGA chips use a 6 pin connector based on SPI bus. (Optional on Arduino AVR modules)\\
 Atmel SAMD chips have a OneWire ICSP (signal/0v/power).
 ===== Incandescent lamps =====
@@ Line 27: / Line 29: @@
  \\ [[http://www.kpsec.freeuk.com/components/lamp.htm|http://www.kpsec.freeuk.com/components/lamp.htm]]
+===== Include Guard =====
+A method of preventing a C or C++ header source file (.h or .hpp), from being included more than once by other files. It uses 'compiler directives' ''#'' to do this.
+''#ifndef _FILENAME_H_''
+''#define _FILENAME_H_''
+''/*  contents of the header file go here */''
+''#endif /* _FILENAME_H_ */''
+If the compiler supports it, then following can be used
+''#pragma once''
+''/*  contents of the header file go here */''
@@ Line 53: / Line 75: @@
-Description used by UK track manufacturer, PECO, to denote turnouts manufactured with an insulated crossing (frog). This avoids the need for polarity switching for the crossing at the expense of poorer current collection for locomotives.
+Description used by UK track manufacturer, PECO, to denote turnouts manufactured with an insulated common crossing, AKA frog. This avoids the need for polarity switching for the crossing at the expense of poorer current collection for locomotives. AKA dead frog.