uartlib.c

blackfin532的一个串口测试代码

/***********************************************/
/*                                             */
/*	DSP BF532/3串口设置程序                    */
/*                                             */
/***********************************************/

#include <cdefBF532.h>
#include <ccblkfn.h>
#include <stdio.h>
#include <sys\exception.h>
#include <stdlib.h>
#include <math.h>
#include "uartlib.h"

//extern volatile BYTE 			uart_recv_buf[];
//extern volatile WORD 			uart_recv_cnt;

//DWORD					MEGA 	= 1000000;	// MHz
#define	BAUD	19200
#define SCLK	133000000


////////////////////////////////////////////////
//串口初始化
////////////////////////////////////////////////
void UART_Init(void)
{		
	//enable UART clock
	int iDivisor = 0;
	*pUART_GCTL = UCEN;
	//enable access to UART_DL registers
	*pUART_LCR = DLAB;
	
	//set the the two 8-bit DL registers (DLH:DLL)
	//*pUART_DLL = 0x41;   
	//*pUART_DLH = 0x0;   	// 
	//iDivisor = 0x57e;//UART_getSCLK()/BAUD*16;
	//iDivisor = UART_getSCLK()/(BAUD*16);
	iDivisor = SCLK/(BAUD*16);
	*pUART_DLL = iDivisor;
	*pUART_DLH = iDivisor>>8;
	//set UART frame to 8 bits, no parity, 1 stop bit. 
	*pUART_LCR = WLS(8);
	//start the uart interrupt
	*pUART_IER = ELSI | ERBFI;
}

void UART_putc(BYTE DATA)
{
	while (!(*pUART_LSR & THRE)) {}; //wait
	*pUART_THR = DATA;		
}

//////////////////////////////////////////////////////////////
void UART_puts(BYTE* src,WORD len)
{	
	WORD i;
    
	for(i=0;i<len;i++)
	{
		UART_putc((BYTE)(*(src+i)));
		//src++;
	}
}

// 计算CRC校验码
unsigned short CalCRC(BYTE* pchData, DWORD iLen)
{ 
	BYTE pchCRCH = 0xFF ;
	BYTE pchCRCL = 0xFF ;
	BYTE uIndex;
	
	while(iLen--)
	{
		uIndex = pchCRCH ^ *pchData++;
		pchCRCH = pchCRCL ^ auchCRCHi[uIndex];
		pchCRCL = auchCRCLo[uIndex];
	}
	return (pchCRCH << 8 | pchCRCL) ;
}

//***********************************************************************/
//										    							               
//	Routine 	: Delay                                       		   
//	Input		: None              									            
//	Output		: None                                					      
//	Function	: 延时1ms      			      
//																		               
//***********************************************************************/
void DelayMili(int uiCount)
{
	int uiTemp;
	int uiCountTemp;
	
	for(uiTemp=0;uiTemp<uiCount;uiTemp++)
	{
		for(uiCountTemp=0;uiCountTemp<14500;uiCountTemp++);			
	}
}