文件列表:

Hello4Skyeye\hello (46727, 2005-03-02)
Hello4Skyeye\hello.c (273, 2005-02-17)
Hello4Skyeye\hello.lds (822, 2005-03-02)
Hello4Skyeye\hello.n (82, 2005-03-02)
Hello4Skyeye\hello.o (1992, 2005-03-02)
Hello4Skyeye\hello.r (3985, 2005-03-02)
Hello4Skyeye\hello.s (3645, 2005-03-02)
Hello4Skyeye\makefile (640, 2005-03-02)
Hello4Skyeye\sk1.log (0, 2005-03-02)
Hello4Skyeye\skyeye.conf (225, 2005-03-02)
Hello4Skyeye\start.o (4744, 2005-03-02)
Hello4Skyeye\start.S (424, 2005-03-02)
Hello4Skyeye (0, 2007-05-01)

HelloForSkyeye Version: 0.0.1 Author: SU Hang Date: 2004-08-28 Introduction: To the freshmen of skyeye and embedded system development, besides reading books, it would be better to have a simple example to exercise. "Hello world" program is often the first one we learn at the beginning of learning a language or tool. Therefore, I tried to use the least codes to print "hello world" on skyeye with reference to ucos-ii codes. Please note: "HelloForSkyeye" is different from the existed "helloworld" program on skyeye. It needs not operation system. It isn't an application. It sends characters to UART directly. "HelloForSkyeye" has a few lines of codes and little value for practice. It is only written as exercise. Compilation and Run: "HelloForSkyeye" is developed on Redhat9.0 and Skyeye0.7.4. Before compilation, please ensure skyeye and arm-elf-tools have been installed. 1. Download HelloForSkyeye.tar to your home directory on linux. 2. tar -xf HelloForSkyeye.tar 3. cd HelloForSkyeye 4. make 5. skyeye hello 6. tar sim 7. load 8. run After these steps, you should see the following results: *************************************************************** **** **** **** SkyEye Simulator Ver 0.7.4 with GDB 5.3 Interface **** **** **** *************************************************************** GNU gdb 5.3 Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This SkyEye was configured as "--host=i686-pc-linux-gnu --target=arm-elf"... (no debugging symbols found)... (SkyEye) tar s cpu info: armv3, arm7tdmi, 41007700, fff8ff00, 0 mach info: name at91, mach_init addr 0x813dae4 log_info: log is off. log_info:log file is /tmp/sk1.log, fd is 0x829e0e0 log_info: log start clock 0 log_info: log end clock 200000 SKYEYE: use arm7100 mmu ops Connected to the simulator. (SkyEye) load Loading section .text, size 0x*** vma 0x1000000 Loading section .data, size 0x1000 vma 0x1002000 Start address 0x1000000 Transfer rate: 33***4 bits in <1 sec. (SkyEye) run Starting program: /home/shang/HelloForSkyeye/hello helloworldhelloworldhelloworldhelloworldhelloworldhelloworldhelloworldhelloworld helloworldhelloworldhelloworldhelloworldhelloworldhelloworldhelloworldhelloworld Source Files: After using command 'make clean' to delete binary files, you will find there are only five source files in "HelloForSkyeye". They are hello.c, hello.lds, makefile, skyeye.conf and start.S. I shall introduce them one by one. makefile: As the input file of 'make', makefile describes how to compile the whole "HelloForSkyeye" project. Some compilation parameters are strange, such as -mapcs, -march. You can find their meaning in "as.info->Machine Dependencies->ARM-Dependent ->ARM Options" start.S: Initial assemble codes are placed in this file to make irq mode with all irqs disabled, set sp_irq and call "hello" fuction to print "helloworld" string. You may find the syntax of comments, constants and symbols is different from what described in textbook about ARM. Don't worry about it, because the GNU assembler has a machine-independent syntax. You can refer to the Syntax chapter of as.info to get more information. hello.c: This is a common C source file which has only one function "hello". The "Hello" function output the "helloworld" string to UART. On AT91, the base address of UART0 is 0xfffd0000 and the offset of US_THR is 0x1c so that when we write character to 0xfffd001c address, it means send character to UART. And skyeye will print the character to the screen. hello.lds This is ld script file in which program entry and every place of section are regulated. The script chapter of ld.info describes the syntax of lds file. We also can use command "objdump -x" to check the binary file. skyeye.conf Configure file of skyeye.

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