hello_world.c

altera epxa1的例子程序

/*
*   C Code for a simple application
*
*	This code prints a user specified message using the embedded uart
* 	as stdin / stdout.
* 	When combined with the appropriate pld files, this software is 
*	programmed into flash using the JTAG and flash interface. 
*
*	It tests the UART by outputting information
*	over the UART at a baud rate of 38400 with 8 bits per 
*	character no parity and one stop bit, with no flow control.
*	You must connect a serial terminal to the board to control this.
*
*	It tests the address and data lines of the flash memory 
*  	For this simple application, no logic exists in the PLD.
*
*	Using the associated make_hello.bat file validates the 
*	embedded software tool chain for compiling, linking and creating
*	flash downloadable images.  
*
*   Copyright (c) Altera Corporation 2001.
*   All rights reserved.
*/

#include <stdio.h>
#include "uartcomm.h"
#include "stripe.h"
#include "flash.h"

void EnableIRQ(void);
void Scroll_PLD(void);
void delay(unsigned int);


volatile unsigned int * LED;

int main(void)
{
	
	LED = (volatile unsigned int*) EXC_PLD_BLOCK0_BASE;
	

	uart_init();
	EnableIRQ();	// Enable processor interrupts
	write_flash_value((unsigned short*)EXC_EBI_BLOCK0_BASE, 0xFFFF);//Writes to flash to reset the boot parameters.
									//The websever will run after the board is reset	
	printf("\r\nAltera Excalibur Development Board\r\n");	
	printf("Look for scrolling LEDs\r\n");

	while (1)
		Scroll_PLD();
}


	
void Scroll_PLD(void)
{
	int i;
	
	*LED = 0x00;
	
	for(i = 0; i < 8; i++)
	{
		*LED = 0x01 << i;
		delay(1000000);
		printf("LED = 0x%x\r\n", *LED);
	}

	*LED = 0x00;
			
	for(i = 0; i < 8; i++)
	{
		*LED = 0x80 >> i;	
		delay(1000000);
		printf("LED = 0x%x\r\n", *LED);
	}
	
	*LED = 0x00;
	
}

void delay(unsigned int time)
{
	volatile int i;
	for(i = 0; i < time; i++);
}

void CAbtHandler(void)
{
	printf("Data abort\r\n");
}

void CPabtHandler(void)
{
	printf("Error prefetch abort\r\n");
}

void CDabtHandler(void)
{
	printf("Error data abort\r\n");
}

void CSwiHandler(void)
{
	printf("Error swi\r\n");
}

void CUdefHandler(void)
{
	printf("Error undefined instruction\r\n");
}