Differences

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--- glossary:glossary_i [2020/05/08 06:13] – [ICs] tgerbic
+++ glossary:glossary_i [2022/01/26 10:40] – [Include Guard] WortingUK
@@ Line 8: / Line 8: @@
-===== ICSP =====
+===== ICSP (In Circuit Serial Programming) =====
+ICSP is a means whereby embedded microprocessors are 'programmed' (having their machine code loaded) while mounted in the circuit they are intended to control.
+There are no standard physical designs/pinouts used for ICSP. \\
+Generally MERG modules, with PIC microprocessors, are provided with a 6 way (1 pin omitted) ICSP connector used with a 'twist' cable to a Microchip PICKIT programmer.
+[[:helpsystem:pickit2cbus|MERG PIC ICSP cable pinout shown here.]]\\
+Arduino modules use a USB connection.\\
+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).
-In Circuit Serial Programming is a means whereby microprocessors (PICs and other types), may be programmed while mounted in the circuit they are intended to control. There are no standard physical designs/pinouts used for in-circuit programming. Many MERG modules using PIC microprocessors are provided with an ICSP connector with a pinout for the popular PICKIT programmer.\\
-[[:helpsystem:pickit2cbus|Pinout shown here.]]\\
 ===== Incandescent lamps =====
@@ Line 23: / 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 */''