example_dps2812m_sci.c

TMS320F2812串口学习例程

/* =================================================================================
File name:       	Example_DPS2812M_DA.C                    
                    
Originator:				SEED R&D Group
		
Description: 
                  DPS2812M Device Digital to Analog test program. 
=====================================================================================
 History:
-------------------------------------------------------------------------------------
 10-20-2005		Release	Rev 1.0         Jijunhui                                          
------------------------------------------------------------------------------*/

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File
#include "Example_DPS2812M_SCI.H"

SCI_DRV SCI=SCI_DRV_DEFAULTS;
const   long 	Tp = 7500;			//PeriodCounter=ControlPeriod*Freq(us*M);HISPCP  
const   long	CPUTime_T0 = 100;       	   //CPU定时时间

interrupt void cpu_timer0_isr(void);	

void main(void)
{

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP281x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO: 
// This example function is found in the DSP281x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example  


// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts 
   DINT;

// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.  
// This function is found in the DSP281x_PieCtrl.c file.
   InitPieCtrl();
   
// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt 
// Service Routines (ISR).  
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP281x_DefaultIsr.c.
// This function is found in DSP281x_PieVect.c.
   InitPieVectTable();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.  
   EALLOW;  // This is needed to write to EALLOW protected registers
   PieVectTable.TINT0 = &cpu_timer0_isr;
   EDIS;    // This is needed to disable write to EALLOW protected registers
   // Step 4. Initialize all the Device Peripherals:
// This function is found in DSP281x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   InitCpuTimers();   // For this example, only initialize the Cpu Timers

// Configure CPU-Timer 0 to interrupt every second:
// 100MHz CPU Freq, 1 second Period (in uSeconds)
   ConfigCpuTimer(&CpuTimer0, 150, CPUTime_T0);   
   StartCpuTimer0();

// Step 5. User specific code, enable interrupts:


   if(SCI.PortSel==RS485)
   	InitSciRS485();
   else
    InitSciRS232();
   

// Enable CPU INT1 which is connected to CPU-Timer 0:
   IER |= M_INT1;

// Enable TINT0 in the PIE: Group 1 interrupt 7
   PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

// Enable global Interrupts and higher priority real-time debug events:
   EINT;   // Enable Global interrupt INTM
   ERTM;   // Enable Global realtime interrupt DBGM

// Step 6. IDLE loop. Just sit and loop forever (optional):
   for(;;)
   {
   };

} 
    
	
interrupt void cpu_timer0_isr(void)
{
  SCI.Comm(&SCI); 
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;	
}

void Comm(SCI_DRV *v)
{	
/************************************************************************/
//*RS485数据发送接收处理
/************************************************************************/
//	int i;
	if(SCI.PortSel==RS232)
	{
		if((v->CommFlag== RX)&&(ScibRegs.SCIRXST.bit.RXRDY == 1))
		{			
			v->CommData[v->Count]=ScibRegs.SCIRXBUF.all;
			v->Count++;
			if(v->Count==v->CommLen)	
			{
				v->CommFlag=TX;
				v->Count=0;	
				GpioDataRegs.GPDDAT.bit.GPIOD5 = 1;			
			}

		}
		else if((v->CommFlag== TX)&&(ScibRegs.SCICTL2.bit.TXRDY == 1))
		{
			if(v->Count<=v->CommLen)	
			ScibRegs.SCITXBUF = v->CommData[v->Count++];			
			else
			{
				v->Count=0;
				v->CommFlag=RX;
				GpioDataRegs.GPDDAT.bit.GPIOD5 = 0;
			}
	
		}
	}
/************************************************************************/
//*RS232数据发送接收处理
/************************************************************************/
 else			
	{
		if((v->CommFlag== RX)&&(SciaRegs.SCIRXST.bit.RXRDY == 1))
		{			
			v->CommData[v->Count]=SciaRegs.SCIRXBUF.all;
			v->Count++;
			if(v->Count==v->CommLen)	
			{
				v->CommFlag=TX;
				v->Count=0;	
			}

		}
		else if((v->CommFlag== TX)&&(SciaRegs.SCICTL2.bit.TXRDY == 1))
		{
			if(v->Count<v->CommLen)	
			SciaRegs.SCITXBUF = v->CommData[v->Count++];			
			else
			{
				v->Count=0;
				v->CommFlag=RX;
			}
	
		}
	}
		
/************************************************************************/
//*SCI数据处理
/************************************************************************/	
}

void InitSciRS485(void)
{

	EALLOW;
	GpioMuxRegs.GPGMUX.all |= 0x0030;
    GpioMuxRegs.GPDMUX.bit.T3CTRIP_PDPB_GPIOD5 = 0;
    GpioMuxRegs.GPDDIR.bit.GPIOD5 = 1;
	EDIS;
	GpioDataRegs.GPDDAT.bit.GPIOD5 = 0;
	ScibRegs.SCICCR.all = 0x07;
	
	ScibRegs.SCICTL1.all = 0x03;
	ScibRegs.SCICTL2.all = 0x00;
	
	ScibRegs.SCIHBAUD = 0x01;
	ScibRegs.SCILBAUD = 0xe7;
	
	ScibRegs.SCICTL1.all = 0x23;
	
	EALLOW;
	GpioMuxRegs.GPFMUX.all |= 0x0030;
	EDIS;
	SciaRegs.SCICCR.all = 0x07;
	
	SciaRegs.SCICTL1.all = 0x03;
	SciaRegs.SCICTL2.all = 0x00;
	
	SciaRegs.SCIHBAUD = 0x01;
	SciaRegs.SCILBAUD = 0xe7;
	
	SciaRegs.SCICTL1.all = 0x23;
}

void InitSciRS232(void)
{

	EALLOW;
	GpioMuxRegs.GPGMUX.all |= 0x0030;
	EDIS;
	ScibRegs.SCICCR.all = 0x07;
	
	ScibRegs.SCICTL1.all = 0x03;
	ScibRegs.SCICTL2.all = 0x00;
	
	ScibRegs.SCIHBAUD = 0x01;
	ScibRegs.SCILBAUD = 0xe7;
	
	ScibRegs.SCICTL1.all = 0x23;
	
	EALLOW;
	GpioMuxRegs.GPFMUX.all |= 0x0030;
	EDIS;
	SciaRegs.SCICCR.all = 0x07;
	
	SciaRegs.SCICTL1.all = 0x03;
	SciaRegs.SCICTL2.all = 0x00;
	
	SciaRegs.SCIHBAUD = 0x01;
	SciaRegs.SCILBAUD = 0xe7;
	
	SciaRegs.SCICTL1.all = 0x23;
}
//===========================================================================
// No more.
//===========================================================================