main.c

AT91RM9200 ADS下C语言编写的串口程序。可以双向收发数据。

//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : main.c
//* Object              : main application written in C
//* Creation            : FB   24/10/2002
//*
//*----------------------------------------------------------------------------



#include "AT91RM9200.h"
#include "lib_AT91RM9200.h"

#define ReadReg(reg)  prints(#reg": ");printd(*(reg)) 

void delay(int i)
{
	for(;i>0;i--)
	;
}

void Delay(unsigned int x)
{	unsigned int i,j,k;
	for(i=0;i<=x;i++)
	for(j=0;j<0xff;j++)
	for(k=0;k<0xff;k++);
}

void prints(char *str)
{	do
	{	*AT91C_DBGU_THR = *str;
    	while(!(*AT91C_DBGU_CSR & 2));
    	str++;
    }	while(*str!='\0');
}

void printd(unsigned int d)
{	unsigned int i,j;
    unsigned int mask = 0xf0000000;
	for(i=0;i<8;i++)
	{	j=(d&mask)>>(28-i*4);
		mask = mask>>4;
		if(j<10) 
			*AT91C_DBGU_THR = j+'0';
    	else  
    		*AT91C_DBGU_THR = j+'A'-10;
    	while(!(*AT91C_DBGU_CSR & 2)); 
	}
	prints("\n\r");	
}



void ambe_rst(void)
{
	AT91F_PIO_Enable(AT91C_BASE_PIOA,AT91C_PIO_PA20);        //配置为I/O口 
	AT91F_PIO_OutputEnable(AT91C_BASE_PIOA,AT91C_PIO_PA20);  // I/O口上拉
	AT91F_PIO_ClearOutput(AT91C_BASE_PIOA,AT91C_PIO_PA20);  //低电平
	delay(10000);
	AT91F_PIO_SetOutput(AT91C_BASE_PIOA,AT91C_PIO_PA20);  //高电平
}


void usart0_init(void)
{
	AT91F_US0_CfgPIO();								//配置为US0
	AT91F_US0_CfgPMC();								//must add
	// Configure  US0
	AT91F_US_Configure(
	AT91C_BASE_US0,          			// US0 base address
	47923000,
	//60000000,                  							// 60 MHz
	AT91C_US_ASYNC_MODE ,        // mode Register to be programmed
	115200 ,                   							// baudrate to be programmed
	0);                        							// timeguard to be programmed
	
	
	//AT91C_BASE_PIOA->PIO_PPUDR =AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
	
	// Enable Transmitter
	
	AT91F_US_EnableTx(AT91C_BASE_US0);
	
	AT91F_US_EnableRx(AT91C_BASE_US0);
	//AT91C_BASE_US0->US_CSR=0x1a;
	
	
	}


void AT91F_US0_SEND(
	char *buffer) // \arg pointer to a string ending by \0
{
	while(*buffer != '\0') {
		while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_US0));
		AT91F_US_PutChar(AT91C_BASE_US0, *buffer++);
	}
}


char AT91F_US0_RECV()
{
	while (!AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_US0));
	return AT91F_US_GetChar(AT91C_BASE_US0);
}



int Main()
{   int RECV[1];
	prints("\n\rBasicBoot Successfull: Enter main()\n\r");

    ambe_rst();//禁止ambe2000
    usart0_init();//串口0初始化
   
    AT91F_US0_SEND("\nInput a number:  ");
	while (1)
	 {
	 	
	 	
		
		 AT91C_BASE_US0->US_IDR = 0xFFFFFFFF ;//关所有中断
    
		//AT91C_BASE_US0->US_THR = 0x22;//直接写发送保存寄存器
		
		AT91F_US0_SEND("\nhit a key one time:  ");
		delay(100000);//延时一定要足够长，否则串口助手终端处理不过来，会出错
		AT91F_US0_SEND("\n");
		
		
		
	    RECV[0]= AT91F_US0_RECV();
	    delay(100000);
	    AT91F_US0_SEND("The key you hit is:  ");
	     AT91F_US0_SEND("\n");
	    
	    AT91C_BASE_US0->US_THR =RECV[0];
	    while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_US0));
	  	delay(100000);
		
	 	//AT91F_US0_SEND("\n");

     }
}