dsp281x_sci.c

一个DSP2812的源代码

//###########################################################################
//
// FILE:	DSP281x_Sci.c
//
// TITLE:	DSP281x SCI Initialization & Support Functions.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  1.00| 11 Sep 2003 | L.H. | No change since previous version (v.58 Alpha)
//###########################################################################

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File
#include "FM25L512.h"

//---------------------------------------------------------------------------
// InitSPI: 
//---------------------------------------------------------------------------
// This function initializes the SPI(s) to a known state.
//
unsigned char  ascitab[] = "0123456789ABCDEF";
void InitSci(void)
{
	// Initialize SCI-A:

 	SciaRegs.SCICCR.all =0x0007;   // 1 stop bit,  No loopback 
                                   // No parity,8 char bits,
                                   // async mode, idle-line protocol
	SciaRegs.SCICTL1.all =0x0003;  // enable TX, RX, internal SCICLK, 
                                   // Disable RX ERR, SLEEP, TXWAKE
	SciaRegs.SCICTL2.all =0x0003; 
	SciaRegs.SCICTL2.bit.TXINTENA =1;
	SciaRegs.SCICTL2.bit.RXBKINTENA =1;
    SciaRegs.SCIHBAUD    =0x0001;
    SciaRegs.SCILBAUD    =0x00B6;     // '01B6'   BAUD =9600
	SciaRegs.SCICCR.bit.LOOPBKENA =0; // Enable loop back  
	SciaRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset 
	// Initialize SCI-B:

	//tbd...
}	


void scia_xmit(int a)
{
    while(SciaRegs.SCICTL2.bit.TXRDY != 1){FEED_WATCHDOG; }
    SciaRegs.SCITXBUF=a;

}

void scia_fifo_init()										
{
    SciaRegs.SCIFFTX.all=0xE040;
    SciaRegs.SCIFFRX.all=0x204f;
    SciaRegs.SCIFFCT.all=0x0;
    
}

void	bcd2ascii(unsigned char dat)	// ----- convert bcd to ascii and send to sci ----
{
    unsigned char temp;
/*	
	temp = (dat >> 4) + 0x30;
	if(temp>0x39)
	  temp = temp+7;
	scia_xmit(temp);
	temp = (dat & 0x0f) + 0x30;
	if(temp>0x39)
	  temp = temp+7;
	scia_xmit(temp);
*/	
	temp = ascitab[(dat >> 4) & 0x0f];
	scia_xmit(temp);
	temp = ascitab[ dat & 0x0f];
	scia_xmit(temp);

}
	
//===========================================================================
// No more.
//===========================================================================