dsp280x_sci.c

TMS320F2808 DSP芯片的接口控制源码

// TI File $Revision: /main/2 $
// Checkin $Date: December 2, 2004   11:59:53 $
//###########################################################################
//
// FILE:	DSP280x_Sci.c
//
// TITLE:	DSP280x SCI Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP280x V1.30 $
// $Release Date: February 10, 2006 $
//###########################################################################

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File

void Scia_init();

//---------------------------------------------------------------------------
// InitSci: 
//---------------------------------------------------------------------------
// This function initializes the SCI(s) to a known state.
//
void InitSci(void)
{
	InitSciaGpio();
	Scia_init();
}	


void InitSciGpio()
{
   InitSciaGpio();
#if DSP28_2808 || DSP28_2806   
   InitScibGpio();
#endif // if DSP28_2808 || DSP28_2806  
}

void InitSciaGpio()
{
   EALLOW;


	GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0;    // Enable pull-up for GPIO28 (SCIRXDA)
	GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0;	   // Enable pull-up for GPIO29 (SCITXDA)


	GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3;  // Asynch input GPIO28 (SCIRXDA)


	GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1;   // Configure GPIO28 for SCIRXDA operation
	GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1;   // Configure GPIO29 for SCITXDA operation
	
    EDIS;
}

void InitScibGpio()
{
   EALLOW;

//  GpioCtrlRegs.GPAPUD.bit.GPIO9 = 0;     // Enable pull-up for GPIO9  (SCITXDB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;    // Enable pull-up for GPIO14 (SCITXDB)
	GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;	   // Enable pull-up for GPIO18 (SCITXDB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0;    // Enable pull-up for GPIO22 (SCITXDB)

	
//  GpioCtrlRegs.GPAPUD.bit.GPIO11 = 0;    // Enable pull-up for GPIO11 (SCIRXDB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO15 = 0;    // Enable pull-up for GPIO15 (SCIRXDB)
    GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;	   // Enable pull-up for GPIO19 (SCIRXDB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO23 = 0;    // Enable pull-up for GPIO23 (SCIRXDB)


//  GpioCtrlRegs.GPAQSEL1.bit.GPIO11 = 3;  // Asynch input GPIO11 (SCIRXDB)
//  GpioCtrlRegs.GPAQSEL1.bit.GPIO15 = 3;  // Asynch input GPIO15 (SCIRXDB)
	GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3;  // Asynch input GPIO19 (SCIRXDB)
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO23 = 3;  // Asynch input GPIO23 (SCIRXDB)


//  GpioCtrlRegs.GPAMUX1.bit.GPIO9 = 2;    // Configure GPIO9 for SCITXDB operation
//  GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 2;   // Configure GPIO14 for SCITXDB operation
	GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 2;   // Configure GPIO18 for SCITXDB operation
//  GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 3;   // Configure GPIO22 for SCITXDB operation
	
//  GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 2;   // Configure GPIO11 for SCIRXDB operation
//  GpioCtrlRegs.GPAMUX1.bit.GPIO15 = 2;   // Configure GPIO15 for SCIRXDB operation
    GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 2;   // Configure GPIO19 for SCIRXDB operation
//  GpioCtrlRegs.GPAMUX2.bit.GPIO23 = 3;   // Configure GPIO23 for SCIRXDB operation
	
    EDIS;
}


void Scia_init()
{    
    // Note: Clocks were turned on to the SCIA peripheral
    // in the InitSysCtrl() function
    
 	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.SCIHBAUD    =0x0000;
    SciaRegs.SCILBAUD    =0x00A1;
	SciaRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset 
}

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);
}
	
//===========================================================================
// End of file.
//===========================================================================