main.c

开发板外设接口实验（1～7）

/*
 *	main.c    -     demo program
 *	
 *	Author: 	li ming <[e-mail]>
 *	Date:		2008-4-16
 *	Copyleft:	http://www.lumit.org
 */

#include "led.h"
#include "beep.h"
#include "timer.h"
#include "int0.h"
#include "uart.h"
#include "irq.h"

/* delay for about one second */
static void delay(int time)	
{
	int i, j;

	for(i = 0; i < time; i++)
		for(j = 0; j < 65536; j++)
			;
}

void int0_hooker(void)
{	
	return;
}

void timer_hooker(void)
{	
	return ;	
}

void uart0_hooker(void)
{			
	/* beep on */
	beep_on();
	delay(10);
	beep_off();	
}

/* find in startup.s */
extern void irq_handler(void);

int main(void)
{
	int i = 0;
	char ch;
	
	install_irq_handler( irq_handler );	

	timer_install_irq_hooker( timer_hooker );
	int0_install_irq_hooker( int0_hooker );
	uart0_install_irq_hooker( uart0_hooker );

	/* Clear all existing pending bit */	
	clear_irq_pending();

	/* Unmask the timer interrupt and the int0 and uart0_recv interrupt */
	unmask_irq(0);	
	unmask_irq(4);	// tx interrupt
	unmask_irq(5);	// rx interrupt
	unmask_irq(10);
	
/* Level1: Clear ARM Core CPSR I-bit */
	__asm
	{
		MOV	r0,0x53
		MSR	CPSR_cxsf, r0		
	}
			
	led_init();
	beep_init();
	int0_init();
	int0_enable_irq();
	timer_init();
	timer_enable_irq();		
	uart0_init();
	uart0_enable_recv_irq();
	uart0_enable_send_irq();
		
	while(++i)
	{
		/*
		led_on(i%2);
		delay(50);
		led_off(i%2);
		delay(50);
		*/
		ch = uart0_getchar();
		if( ch == '\r' )	// 0x0d
		{				
				uart0_putchar('\r');
				uart0_putchar('\n');
				continue;
		}
		if( ch == '\b' )	// 0x08
		{
				uart0_putchar('\b');		
				uart0_putchar(' ');
				uart0_putchar('\b');
				continue;
		}
		if( ch != 0 )
			uart0_putchar(ch);
	}

	return 0;
 
}

void __rt_entry(void)
{
	main();	
}