dsp28_sci.c

C语言编写的DSP例程,是一个跑马灯程序 希望对初学者有用

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	DSP28_Sci.c
//
// TITLE:	DSP28 SCI Initialization & Support Functions.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.55| 06 May 2002 | L.H. | EzDSP Alpha Release
//  0.56| 20 May 2002 | L.H. | No change
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################

#include "DSP28_Device.h"

//---------------------------------------------------------------------------
// InitSPI: 
//---------------------------------------------------------------------------
// This function initializes the SPI(s) to a known state.
//
void InitSci(void)
{
	// Initialize SCI-A:
	
	EALLOW;

	GpioMuxRegs.GPFMUX.bit.SCITXDA_GPIOF4 = 1;//GPIOF4 as SCI_A TX pin
    GpioMuxRegs.GPFMUX.bit.SCIRXDA_GPIOF5 = 1;//GPIOF4 as SCI_A RX pin
    GpioMuxRegs.GPFDIR.bit.GPIOF4 = 1;  //Tx as output
  	GpioMuxRegs.GPFDIR.bit.GPIOF5 = 0;  //Rx as input
  	 
	EDIS;
	/* loopback disable  8 bit data */
	SciaRegs.SCICCR.all = 0x07;	// 1 bit stop, disable parity, idle mode, 8 bits data 
	
	SciaRegs.SCICTL1.all = 0x03; // enable TX 
	SciaRegs.SCICTL2.all = 0x03; //
	
	SciaRegs.SCIHBAUD = 0x00;
	SciaRegs.SCILBAUD = 0xA2;  //f3
	
	SciaRegs.SCICTL1.all = 0x23;
	
	PieCtrl.PIEIER9.bit.INTx1 = 1;  //Enable SCI-A RX interrupt
//	PieCtrl.PIEIER9.bit.INTx2 = 1;  //Enable SCI-A TX interrupt
	//tbd...
 	

	// Initialize SCI-B:

	//tbd...
}

/********************************************************************************
	name:	int SciaTx_Ready(void)
	input:	none
	output:	i	1:	ready
			0:	busy
*********************************************************************************/

int SciaTx_Ready(void)
{
	unsigned int i;
	if(SciaRegs.SCICTL2.bit.TXRDY == 1)
	{
		i = 1;
	}
	else
	{
		i = 0;
	}
	return(i);
}

/********************************************************************************
	name:	int SciaRx_Ready(void)
	input:	none
	output:	i	1:	new data
			0:	none
*********************************************************************************/

int SciaRx_Ready(void)
{
	unsigned int i;
	if(SciaRegs.SCIRXST.bit.RXRDY == 1)
	{
		i = 1;
	}
	else
	{
		i = 0;
	}
	return(i);
}
	
//===========================================================================
// No more.
//===========================================================================