main.cpp

一些linux和uboot的学习笔记

#include "AT91SAM9261.h"
extern void uart_rx_init(void);
extern void UartSendst( char *pt);
extern int dataflash_init();


void time_delay(void)
{
    int a = 0;	
    int i = 0;
    int j = 0;

    for(i=0 ;i < 10; i++)
    {	    
	for(j=0 ;j<200; j++)    
	{
                for(a = 0;a<100;a++)  
		{	
		asm("nop");
//                a++; 
		}
	}
    }	
}





int main()
{
//        sys_init();
        *AT91C_PIOA_CODR = 0xc0000000;
        *AT91C_PIOA_CODR = 0x00018000;
        int flash_status = 0;
	char read = 0;
	uart_rx_init(); 
        flash_status = dataflash_init();
        UartSendst("test dataflash!!");
        
        read = flash_status & 0xff;	
        UartSendst( &read );
        read = (flash_status>>8) & 0xff;
        UartSendst( &read);
        read = (flash_status>>16) & 0xff;
        UartSendst( &read );
        read = (flash_status>>24) & 0xff;
        UartSendst( &read);
	
	while(1)
	{
//	   time_delay();
	   *AT91C_PIOA_CODR = 0xc0000000;
	   *AT91C_PIOA_CODR = 0x00018000;
	   time_delay();
//	   uart_init();
 
	   *AT91C_PIOA_SODR = 0xc0000000;
	   *AT91C_PIOA_SODR = 0X00018000;
	   time_delay();

	}	
		
}