uart_test.c

适合LPC系列的ARM开发中的简单实例,请多多执教

#define	LPCEB2000_I

/*********************************************************************************************
* File：	uart_test.c
* Author:	Embest w.h.xie
* Desc：	test uart0 port
* History:	
*********************************************************************************************/

#include   "target.h"

extern  void   irq_uart0(void);

uint8   ucNewData,ucDataBuf[8];

/*********************************************************************************************
* name:		time_dly
* func:		display code
* para:		dly			--in, delay value
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  time_dly(uint32  dly)
{  
	uint32  i;

	for(; dly>0; dly--) 
		for(i=0; i<500; i++);
}

/*********************************************************************************************
* name:		irq_uart0_srv
* func:		uart0 interrupt code
* para:		none
* ret:		none
* modify:
* comment:		receive 8 byte then send data
*********************************************************************************************/
void   irq_uart0_srv(void)
{
	uint8  i;
	 
	if ( 0x04==(UART0_IIR&0x0F) )
	{
		ucNewData = 1;
		for(i=0; i<8; i++) 
			ucDataBuf[i] = UART0_RBR;
	}

	//interrupt finish
	VICVectAddr = 0x00;
} 

/*********************************************************************************************
* name:		sys_init
* func:		init the sys
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  sys_init()
{
	// allow PLL
	PLLCON = 1;
	VPBDIV = PLL_VPBDIV;
	PLLCFG = PLL_CFG;

	PLLFEED = 0xaa;
	PLLFEED = 0x55;
	while((PLLSTAT & (1 << 10)) == 0);
	PLLCON = 3;
	PLLFEED = 0xaa;
	PLLFEED = 0x55;

	// set MAM 2 CCLK
	MAMCR   = 0;
	MAMTIM  = MAM_TIM;
	MAMCR   = 2;

	// init all interrupt
	VICIntEnClr = 0xffffffff;
	VICVectAddr = 0;
	VICIntSelect = 0;
}

/*********************************************************************************************
* name:		Main
* func:		main fun
* para:		none
* ret:		none
* modify:
* comment:	
*********************************************************************************************/

int  Main(void)
{
	uint8	i;
	uint16   bauddiv;

	// init GPIO, open uart0
	PINSEL0 = 0x00000005;
	PINSEL1 = 0x00000000;
	
	sys_init();

	// init interrupt
	VICIntSelect = 0x00000000;
	VICVectCntl0 = 0x26;
	VICVectAddr0 = (int)irq_uart0;
	VICIntEnable = 0x00000040;
	
	// init uart0
	UART0_LCR = 0x80;
	bauddiv   = (10000000>>4)/9600;
	UART0_DLM = bauddiv>>8;
	UART0_DLL = bauddiv&0xff;
	UART0_LCR = 0x03;	
	UART0_FCR	= 0x81;
	UART0_IER	= 0x01;
	
	ucNewData	= 0;

	do 
	{
		if (ucNewData == 1)
		{
			ucNewData = 0;
			for(i=0; i<8; i++) 
				UART0_THR = ucDataBuf[i];
			while( (UART0_LSR&0x20)==0 );
		}
	}
	while(1);
}