test_rtc.c

ARM开发代码以及bootloader的初始化程序参考

/*
 *	test_rtc.c  --  demo of test real-time clock application
 *	
 *	Author: 	lumit-admin <[e-mail]>
 *	Date:		2005-1-10
 *	Copyright:	http://www.lumit.org
 */

#include "led.h"
#include <stdio.h>

//#define SYSCFG		(0x03ff0000)
#define UART0_BASE	(SYSCFG + 0xD000)
#define UART1_BASE 	(SYSCFG + 0xE000)

/*
 * Serial settings.......................
 */
	
#define	ULCON	0x00 
#define	UCON	0x04
#define	USTAT	0x08
#define	UTXBUF	0x0C
#define	URXBUF	0x10
#define	UBRDIV	0x14

/*
 * Line control register bits............
 */
 
#define	ULCR8bits		(3)
#define	ULCRS1StopBit	(0)
#define	ULCRNoParity	(0)

/*
 * UART Control Register bits............
 */
 
#define 	UCRRxM	(1)
#define 	UCRRxSI	(1 << 2)
#define 	UCRTxM	(1 << 3)
#define 	UCRLPB	(1 << 7)

/*
 * UART Status Register bits
 */
 
#define USROverrun     	(1 << 0)
#define	USRParity      	(1 << 1)
#define	USRFraming     	(1 << 2)
#define	USRBreak       	(1 << 3)
#define	USRDTR			(1 << 4)
#define	USRRxData      	(1 << 5) 
#define	USRTxHoldEmpty 	(1 << 6)
#define	USRTxEmpty     	(1 << 7)

#define GET_STATUS(p)	(*(volatile unsigned  *)((p) + USTAT))
#define RX_DATA(s)     	((s) & USRRxData)
#define GET_CHAR(p)		(*(volatile unsigned  *)((p) + URXBUF))
#define TX_READY(s)    	((s) & USRTxHoldEmpty)
#define PUT_CHAR(p,c)  	(*(unsigned  *)((p) + UTXBUF) = (unsigned )(c))

void delay()
{
	int i, j;

	for( i=0; i<50; i++ )
		for ( j=0; j<65536; j++ )
			;
}

void loop( void )
{
	LED_1_ON;
	LED_2_ON;
	LED_3_ON;
	LED_4_ON;

	delay();
	
	LED_1_OFF;
	LED_2_OFF;
	LED_3_OFF;
	LED_4_OFF;

	delay();			
	
	LED_1_ON;
	LED_2_ON;
	LED_3_ON;
	LED_4_ON;
}

int putchar_uart0(int ch)
{
    /* Place your implementation of fputc here     */
    /* e.g. write a character to a UART, or to the */
    /* debugger console with SWI WriteC            */   

	while ( TX_READY(GET_STATUS(UART0_BASE))==0);
	    PUT_CHAR(UART0_BASE, ch);
	    
   return ch;
}

struct __FILE { int handle;   /* Add whatever you need here */};
FILE __stdout;

int fputc(int ch, FILE *f)
{
    /* Place your implementation of fputc here     */
    /* e.g. write a character to a UART, or to the */
    /* debugger console with SWI WriteC            */   

   putchar_uart0( ch );
	    
   return ch;
}

int ferror(FILE *f)
{
    /* Your implementation of ferror */
    return EOF;
}


void install_irqhandler(void * isr)
{
	/* ARM irq exception vector addr is 0x00000018  */
	unsigned int * irq_vec_addr = ( unsigned int * ) 0x18;
	/* this is isr entry address, could be another address like 0x3c, 0x58... */
	unsigned int * isr_entry_addr = ( unsigned int * ) 0x38;

	unsigned int instruction;
	
	/* set the ISR entry at 0x38  */
	*isr_entry_addr = (unsigned int)isr;
	
	/* make an instruction: it is machine-code for "ldr  pc, [pc, #(38-18-8)]"  */
	instruction = ((unsigned int) isr_entry_addr  - (unsigned int)irq_vec_addr - 0x08) | 0xe59ff000;
	
	/* set this instruction at 0x18  */
	*irq_vec_addr = instruction;	
}

void RTCTest(void);
void IRQ_Handler(void);

#define REG32         volatile unsigned long
void SysSetInterrupt(REG32 vector, void (*handler)());
//int main (void)
void C_Entry( void )
{	
	printf( "C_Entry enter!\r\n" );

	printf( "install_irqhandler ..." );
	install_irqhandler( (void *)IRQ_Handler );
	printf( "ok!\r\n" );
	
	printf( "RTC program test begin!\r\n" );
	
	while(1)
		IICTest();
}

/****************************************************************
 * End of test_usb.c
 ****************************************************************/