uart.c

一些linux和uboot的学习笔记

#include "AT91SAM9261.h"
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
void UartSendst( char *pt);
void UartSend(char data);
extern inline void AT91F_US_EnableIt (
	AT91PS_USART pUSART, // \arg pointer to a USART controller
	unsigned int flag);   // 

static void Delay(int time)
{
	while(time--);
}

void UartSend(char data)
{
	if(data=='\n')
	{
		while(!((AT91C_BASE_US0->US_CSR) & AT91C_US_TXRDY));			
										//žÄ¶¯ÑÓʱʱŒä1--10
		Delay(10);					//ÓÉÓÚ³¬Œ¶Öն˷ŽÓŠœÏÂý£¬ÓÐÒ»žö΢СÑÓ³Ù
		AT91C_BASE_US0->US_THR ='\n';
                while(!((AT91C_BASE_US0->US_CSR) & AT91C_US_TXRDY));			
										//žÄ¶¯ÑÓʱʱŒä1--10
		Delay(10);					//ÓÉÓÚ³¬Œ¶Öն˷ŽÓŠœÏÂý£¬ÓÐÒ»žö΢СÑÓ³Ù
		AT91C_BASE_US0->US_THR ='\r';
	       
        }
        else
        {  
		while(!((AT91C_BASE_US0->US_CSR) & AT91C_US_TXRDY));		//µÈŽýÖªµÀTHR±ä¿Õ
										//žÄ¶¯ÑÓʱʱŒä1--10
		Delay(10);
	AT91C_BASE_US0->US_THR = (data & 0x1FF);
                
        }

}

void UartSendst( char *pt)
{
    while(*pt)
    UartSend(*pt++);
}

/************************************************/



/*
typedef char* __va_list[1];
*/

/*
void arm_printf(char *fmt, ...)
{
    va_list ap;
    char string[256];    

    va_start(ap, fmt);
    vsprintf(string, fmt, ap);
    UartSendst(string);
    va_end(ap);
    
}
*/
void uart_rx_int(void)
{
    char  data = (AT91C_BASE_US0->US_RHR & 0X1FF);
    UartSend(data);
}

void uart_rx_init(void)
{

    AT91PS_AIC pAic = AT91C_BASE_AIC;	
    unsigned int mask ;

    unsigned int irq_id = AT91C_ID_US0;

    mask = 0x1 << irq_id ;
    pAic->AIC_IDCR = mask ; 
    pAic->AIC_SMR[irq_id] = ((6&0xf)<<4 | (6 & 0x7));

    pAic->AIC_SVR[irq_id] = (unsigned int) uart_rx_int;
    pAic->AIC_ICCR = mask ; 

    pAic->AIC_IECR = 0x1 << irq_id ;
    
    AT91F_US_EnableIt(AT91C_BASE_US0,AT91C_US_RXRDY) ; 

}