hello_led_0
所属分类:嵌入式/单片机/硬件编程
开发工具:C/C++
文件大小:6KB
下载次数:58
上传日期:2007-05-17 13:28:26
上 传 者:
xiaoweihuacom
说明: 一个sd卡读写的源程序,这个程序是基于altera的嵌入式处理器nios的。不包含文件系统,代码简单明了,强烈推荐
(A sd card reader of the source, this procedure is based on altera s Nios embedded processor. Does not contain a file system, the code is simple and clear, strongly recommend)
文件列表:
hello_led_0\.cdtbuild (1767, 2006-07-20)
hello_led_0\.cdtproject (586, 2006-07-20)
hello_led_0\.project (623, 2006-07-20)
hello_led_0\application.stf (134, 2006-07-20)
hello_led_0\basic_io.h (1054, 2005-07-22)
hello_led_0\hello_led.c (732, 2006-07-26)
hello_led_0\LCD.c (1305, 2005-09-15)
hello_led_0\LCD.h (610, 2005-07-17)
hello_led_0\SD_Card.h (6593, 2005-09-08)
hello_led_0 (0, 2006-12-25)
/**************************************************************************
* Copyright 2004 Altera Corporation, San Jose, California, USA. *
* All rights reserved. All use of this software and documentation is *
* subject to the License Agreement located at the end of this file below.*
*************************************************************************/
/******************************************************************************
* DANGER ** WARNING ** Please read before proceeding! ** WARNING ** DANGER *
******************************************************************************
*
* This program is an example of a "free-standing" C application. If you
* modify this example and try to call C library functions such as printf, they
* will NOT work unless you explicitly initialize the system, such as in the
* hello_alt_main software template. Please see below for details.
*
* Description
* *************
* A very minimal program that simply shifts an LED back and forth.
*
* Requirements
* **************
* According to the ANSI C standard, freestanding programs "own" the hardware,
* and cannot rely on system-services or device-drivers being initialized prior
* to program-start. A freestanding program is responsible for initializing all
* hardware devices, device-drivers, and system-services. Many embedded
* programs are, by nature, freestanding. The author relinquishes any illusion
* of running their program on a workstation.
*
* This example is a freestanding program because it's entry point is the
* function:
*
* void alt_main (void)
*
* As opposed to "main()" as a "hosted" application would (see the
* "hello_world" example).
*
* Upon entry to alt_main():
* - The CPU's caches (if any) have been initialized.
* - The stack-pointer has been set.
* - That's all. The rest is up to you.
*
* If you modify this example and try to call C library functions such as
* printf, they will NOT work unless you explicitly initialize the system.
* If you wish to use C library calls, it is strongly suggested you start
* with the hosted hello_world template which uses main() as it's entry
* point.
*
* On the other hand, if you want to write a program that gets-in even
* earlier, you will need to provide your own assembly-language machine-setup
* code by defining the symbol "_start". Any definition of _start in your
* directory will override the library definition. You can find source code
* for the Nios II library _start here:
*
* /components/altera_nios2/HAL/src/crt0.S
*
* This software example requires a system with a PIO peripheral named
* "led_pio". The software example will run on the following hardware
* examples:
*
* Nios Development Board, Stratix II Edition:
* - Standard
* - Small
* - Full Featured
*
* DSP Development Board, Stratix II Edition:
* - Standard
* - Small
* - Full Featured
*
* Nios Development Board, Stratix Edition:
* - Standard
* - Small
* - Full Featured
*
* Nios Development Board, Stratix Professional Edition:
* - Standard
* - Small
* - Full Featured
*
* Nios Development Board, Cyclone Edition:
* - Standard
* - Small
* - Low Cost
* - Full Featured
*
* Peripherals Exercised by SW
* *****************************
* The hello_led.c program simply shifts an 8-bit variable back and forth,
* writing the variable's value to the system's LED PIO peripheral on every
* iteration.
*
* Software Files
* ****************
* hello_led.c - Main C file that contains the simple led manipulation routine.
*
*/
近期下载者:
相关文件:
收藏者: