Bare Metal programming A13 - Revision history

Scott: /* Do something useful, Modify the hello world to set GPIO */

2013-05-18T15:30:38Z

‎Do something useful, Modify the hello world to set GPIO

2013-05-18T14:33:38Z

‎Do something useful, Modify the hello world to set GPIO

2013-05-18T13:53:31Z

‎Building quickly and adding new files

2013-05-18T13:47:24Z

‎Building quickly and adding new files

2013-05-18T13:41:45Z

‎Do something useful, Modify the hello world to set GPIO

2013-05-18T13:21:45Z

‎Do something useful, Modify the hello world to set GPIO

2013-05-11T11:28:52Z

‎Setup Eclipse

2013-05-11T11:17:31Z

‎Setup Eclipse

2013-05-11T10:54:27Z

‎Setup Eclipse

2013-05-06T12:10:26Z

‎Setup Eclipse tool chain

@@ Line 315: / Line 315: @@
 <pre>
-uint32_t  	*portGConfig;
+//set these to volatile to ensure actions on them aren't compiled out
-uint32_t  	*portGData;
+volatile uint32_t  	*portGConfig;
 //setup pointers for GPIO registers

← Older revision		Revision as of 14:33, 18 May 2013
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	Compile the new program, run it and the GPIO should turn on.		Compile the new program, run it and the GPIO should turn on.
		+
		+	'''GPIO issue'''
		+
		+	The above code works but the LED only turns on if printf is used. This appears to be caused by compiling optimization.
		+
		+	Not sure how to fix this with the u boot make files however the make file in the following section has optimization turned down to allow the GPIO setting to not be compiled out.

	===Building quickly and adding new files===		===Building quickly and adding new files===

← Older revision		Revision as of 13:53, 18 May 2013
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	In a terminal go to the standalone directory and type make -f myMakefile		In a terminal go to the standalone directory and type make -f myMakefile

−	This should compile the hello_world program.	+	This should compile the hello_world program. It will also generate some assembly files which can be useful to use when optimizing your code.
		+
		+
		+	Adding new header files can be done without any change as long as they are referenced in the hello_world file.
		+
		+	Adding new c files is difficult with the original make files. With the new make file just add the new file name in the "SOURCES" line after hello_world.c<br/>
		+	For example if you add in a gpio.c file the first line should become<br/>
		+	SOURCES=hello_world.c gpio.c
		+
		+	you can now quickly compile and add in new files

@@ Line 333: / Line 333: @@
 Building the stand alone program at the moment requires all of uboot to be compiled, this can take several minutes depending on the machine used.
 To speed this up and make it easier to add in new files for compilation. The text in the following wiki page can be used to create a make file
 [[Stand_Alone_MakeFile]]

← Older revision		Revision as of 13:41, 18 May 2013
Line 329:		Line 329:

	Compile the new program, run it and the GPIO should turn on.		Compile the new program, run it and the GPIO should turn on.
		+
		+	===Building quickly and adding new files===
		+
		+	Building the stand alone program at the moment requires all of uboot to be compiled, this can take several minutes depending on the machine used.
		+
		+	To speed this up and make it easier to add in new files for compilation. The text in the following wiki page can be used to create a make file
		+
		+	[[Stand_Alone_MakeFile]]

← Older revision		Revision as of 13:21, 18 May 2013
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	===Do something useful, Modify the hello world to set GPIO===		===Do something useful, Modify the hello world to set GPIO===
−	~~COMING SOON~~	+	All devices within the A13 processor are memory mapped therefore changing a memory location with data will take affect on the associated hardware.
		+
		+	The hello world program can be modified as follows to turn on the LED on the olinuxino A13 board.
		+
		+	Add in the following definitions under the includes<br/>
		+	Note: all of the information in these defines are contained within the A10 detailed manual<br/>
		+	<pre>
		+	#define GPIOBase 0x01C20800
		+	#define GPIOIncrement 0x24
		+
		+	#define ALLWINNER_GPIO_G GPIOBase + (6*GPIOIncrement)
		+
		+	#define Port_CFG1 0x04 //pin direction and function 8 to 15
		+	#define Port_DAT 0x10
		+	</pre>
		+
		+	Add in the following code at the top of the main file<br>
		+
		+	<pre>
		+	uint32_t *portGConfig;
		+	uint32_t *portGData;
		+
		+	//setup pointers for GPIO registers
		+	portGConfig = (uint32_t *)(ALLWINNER_GPIO_G + Port_CFG1);
		+	portGData = (uint32_t *)(ALLWINNER_GPIO_G + Port_DAT);
		+
		+	//configure port G pin 9 to output
		+	*portGConfig \|= 0x10;
		+	//set output to on
		+	*portGData \|= 0x0200;
		+	</pre>
		+
		+	Compile the new program, run it and the GPIO should turn on.

@@ Line 286: / Line 286: @@
 Once you click Ok the system will be ready to build when build is pressed.
 ===Do something useful, Modify the hello world to set GPIO===
 COMING SOON

@@ Line 277: / Line 277: @@
 - Press OK, it may take some time to index<br/>
 To setup the build command<br/>
 - wait for the project to stop indexing<br/>

@@ Line 275: / Line 275: @@
 - locate the folder with the source code previously downloaded - the folder should be named olinuxino/u-boot-sunxi<br/>
 - Select Cross gcc<br/>
----To be continued---
+To setup the build command<br/>
 ===Do something useful, Modify the hello world to set GPIO===
 COMING SOON