send.c

DSP实现TL16C550及RS232串口数据传输（发送端）

#define UART_BASE_ADDR			0x400400
#define RBR				*((int *)(UART_BASE_ADDR+0))
#define THR				*((int *)(UART_BASE_ADDR+0))	
#define IER				*((int *)(UART_BASE_ADDR+1))
#define IIR				*((int *)(UART_BASE_ADDR+2))	
#define FCR				*((int *)(UART_BASE_ADDR+2))	
#define LCR				*((int *)(UART_BASE_ADDR+3))
#define MCR				*((int *)(UART_BASE_ADDR+4))
#define LSR				*((int *)(UART_BASE_ADDR+5))
#define MSR				*((int *)(UART_BASE_ADDR+6))
#define SCR				*((int *)(UART_BASE_ADDR+7))
#define DLL				*((int *)(UART_BASE_ADDR+0))
#define DLM				*((int *)(UART_BASE_ADDR+1))
void TMCR_reset( void );
void EMIF_init(void);
void wait(int nWait);
int cString[5];

main()
{
	unsigned int uWork;
	int i;
    TMCR_reset();
    PLL_Init(12);
    EMIF_init();
    
   	LCR = 0x80; 
	DLL = 0x18;    
	DLM = 0x00;  
	LCR = 0x03;    
	FCR = 0x01;
	MCR = 0x00;
	MSR = 0x00;
	IER = 0x00;      

	for ( i=0;i<5;i++ )
			{
				do
				{ 
					uWork=LSR;
				} while ( uWork&0x040 != 0x040 );
				cString[i]=i;
				THR=cString[i];
				wait(128);		
			}
	}	
void EMIF_init(void)
{
    
    ioport unsigned int *ce21  =(unsigned int *)0x809;
    *ce21   = 0x1fff;
}

void TMCR_reset( void )
{
    ioport unsigned int *TMCR_MGS3=(unsigned int *)0x07FE;   
    ioport unsigned int *TMCR_MM =(unsigned int *)0x07FF;   
    *TMCR_MGS3 =0x510;
    *TMCR_MM   =0x000;


}
void wait(int nWait)
{
	int i,j,k=0;
	for ( i=0;i<nWait;i++ )
		for ( j=0;j<64;j++ )
			k++;
}