USB SNES Controller - Revision history

Christian: /* Microcontroller */ link to microchip.com

2011-06-16T09:09:19Z

‎Microcontroller: link to microchip.com

Christian: /* Microcontroller */ added programmer

2011-06-16T09:05:56Z

‎Microcontroller: added programmer

Christian: /* Schematic */ expression

2011-06-15T12:44:52Z

‎Schematic: expression

Christian: /* Prototype */ link to Cadsoft

2011-06-15T12:44:08Z

‎Prototype: link to Cadsoft

Christian: /* Microcontroller */ added features of microcontroller

2011-06-15T10:55:23Z

‎Microcontroller: added features of microcontroller

Christian: /* Final Version */ changed link to Eagle files

2011-06-15T10:34:52Z

‎Final Version: changed link to Eagle files

Christian: /* Final Version */ link to files in Subversion

2011-06-15T10:23:49Z

‎Final Version: link to files in Subversion

Christian: /* Code */ added description of code modules

2011-06-15T09:51:37Z

‎Code: added description of code modules

Christian: /* Code */

2011-06-15T09:14:21Z

‎Code

Christian: /* Code */ put link to code to the top

2011-06-15T08:17:19Z

‎Code: put link to code to the top

@@ Line 31: / Line 31: @@
 * 16kB Flash memory
-To program (flash) the microcontroller, one needs a programmer or debugger with In-Circuit Serial Programming (ICSP) support. There's either the official ones from Microchip, but since these were too expensive for this project, I chose to build my own, similar to [http://www.sprut.de/electronic/pic/brenner/index.htm#brenner5 Brenner5] from Sprut's homepage (you can find more details under [[PIC programmer]]).
+To program (flash) the microcontroller, one needs a programmer or debugger with In-Circuit Serial Programming (ICSP) support. There's either the official ones from [http://www.microchip.com Microchip], but since these were too expensive for this project, I chose to build my own, similar to [http://www.sprut.de/electronic/pic/brenner/index.htm#brenner5 Brenner5] from Sprut's homepage (you can find more details under [[PIC programmer]]).
 == Code ==

@@ Line 30: / Line 30: @@
 * Low-power modes
 * 16kB Flash memory
 == Code ==

@@ Line 97: / Line 97: @@
 == Schematic ==
-The board layout for the final version was done with eagle, for that I first drew the schematic:
+The board layout for the final version was done with Eagle, the first thing was to draw the schematic:
 [[File:SNESUSB_schematic.png|none|300px]]

@@ Line 51: / Line 51: @@
 = Prototype =
-I created a first prototype on a hole pattern board for developing the code and easy debugging. The board layout was done with Eagle.
+I created a first prototype on a hole pattern board for developing the code and easy debugging. The board layout was done with [http://www.cadsoft.de Eagle].
 <gallery>

@@ Line 22: / Line 22: @@
 [[File:PIC18F2450_side.jpg|thumb|200px|PIC18F2450 microcontroller in DIL and QFN package]]
 The microcontroller I chose for this project was one of the smallest PICs which has USB support: '''PIC18F2450''' with 28 pins.
 == Code ==

@@ Line 85: / Line 85: @@
 When the experiments with the prototype were successful, I started to develop the final, miniaturized version.
-All source files in Eagle format can be found in the Subversion repository in the directory [http://code.google.com/p/usb-snes-controller/source/browse/trunk/board svn/trunk/board].
+All source files in Eagle format can be found in the Subversion repository in the directory <code>svn/trunk/board</code>:
 == Schematic ==

@@ Line 38: / Line 38: @@
 : This module implements the main application logic: CPU initialization and SNES controller polling. In the central <code>while (1)</code> loop all controller buttons are polled cyclically every few milliseconds. The state of all buttons is recorded in the array <code>buttons</code>. If the state of one or more buttons changed since the last poll cycle, a new [[Wikipedia:USB_human_interface_device_class#Reports|HID report]] is generated and the ''usb.c'' module notified that the report changed.
 ; usb.c
-: In this module all USB logic is implemented. Interrupts from USB are handled here and then processed by the appropriate <code>process_*()</code> functions, depending on what endpoint is targeted. This code contains a lot of <code>DEBUG_OUT()</code> macros which can be used to obtain debug output over a serial connection (implemented in ''debug.c'')
+: In this module all USB logic is implemented. Interrupts from USB are handled here and then processed by the appropriate <code>process_*()</code> functions, depending on what endpoint is targeted. This code contains a lot of <code>DEBUG_OUT()</code> macros which, when enabled, resolve to functions calls to ''debug.c''. These are there to help debugging and to see what is happening on the USB.
 ; debug.c
-: In ''debug.c'' are
+: In ''debug.c'' are functions for serial I/O. With a serial terminal (such as the [[LCD Terminal]]) one can see what transactions, etc. appear on the USB. When <code>DEBUG</code> is undefined (see ''debug.h'') these are all empty and don't cause any performance degradation.
 = Prototype =

← Older revision		Revision as of 09:14, 15 June 2011
Line 29:		Line 29:


−	~~To compile~~ and ~~link~~ the code I use the '''MCC18''' compiler from [http://www.microchip.com Microchip]. It is available in a free evaluation version in which only a few optimizations have been disabled.	+	For compiling and linking the code I use the '''MCC18''' compiler from [http://www.microchip.com Microchip]. It is available in a free evaluation version in which only a few optimizations have been disabled.
		+
		+	To compile the code, all that is needed is the directory <code>svn/trunk/src</code>. Edit the <code>Makefile</code> and set the correct directories there so MCC18 can be found. Then simply execute <code>make.exe</code>
		+
		+
		+	The code is divided into three modules:
		+	; main.c
		+	: This module implements the main application logic: CPU initialization and SNES controller polling. In the central <code>while (1)</code> loop all controller buttons are polled cyclically every few milliseconds. The state of all buttons is recorded in the array <code>buttons</code>. If the state of one or more buttons changed since the last poll cycle, a new [[Wikipedia:USB_human_interface_device_class#Reports\|HID report]] is generated and the ''usb.c'' module notified that the report changed.
		+	; usb.c
		+	: In this module all USB logic is implemented. Interrupts from USB are handled here and then processed by the appropriate <code>process_*()</code> functions, depending on what endpoint is targeted. This code contains a lot of <code>DEBUG_OUT()</code> macros which can be used to obtain debug output over a serial connection (implemented in ''debug.c'')
		+	; debug.c
		+	: In ''debug.c'' are

	= Prototype =		= Prototype =

@@ Line 24: / Line 24: @@
 == Code ==
-To compile and link the code I use the '''MCC18''' compiler from [http://www.microchip.com Microchip]. It is available in a free evaluation version in which only a few optimizations have been disabled.
+All code files other source files can be found in the Subversion repository, hosted by [[File:googlecode_logo.gif|80px|link=https://code.google.com/p/usb-snes-controller|Google Code]]
-:https://code.google.com/p/usb-snes-controller
+To compile and link the code I use the '''MCC18''' compiler from [http://www.microchip.com Microchip]. It is available in a free evaluation version in which only a few optimizations have been disabled.
 = Prototype =