CCS/TMS320F28335: To trsmit data from PC to PCB via SCI

#include "DSP28x_Project.h"

void scia_loopback_init(void);
void scia_fifo_init(void);
void scib_loopback_init(void);
void scib_fifo_init(void);
void scic_loopback_init(void);
void scic_fifo_init(void);

void scia_xmit(int a);
void scib_xmit(int a);
void scic_xmit(int a);

void Delay();
Uint16 rdataA[8];
void error(void);
Uint16 LoopCount;
Uint16 ErrorCount;


void main(void)
 {
	Uint16  SendChar;
	Uint16  ReceivedChar;

   InitSysCtrl();
   InitSciGpio();

	DINT;
	IER = 0x0000;
	IFR = 0x0000;

    InitPieVectTable();

    scic_loopback_init();
    scic_fifo_init();
    SendChar = 0;

	while(1)
    {
		scic_xmit(0xAB);

     while(ScicRegs.SCIFFRX.bit.RXFFST !=1);
       ReceivedChar = ScicRegs.SCIRXBUF.all;

      if(ReceivedChar != SendChar) error();

        // Move to the next character and repeat the test
             SendChar++;
         // Limit the character to 8-bits
             SendChar &= 0x00FF;
           //  LoopCount++;

             scic_xmit(ReceivedChar );
            // LoopCount++;*/
	   Delay();

    }
}

void Delay()
{
	unsigned int i;
	for(i = 0;i < 1000;i++);
}

void scia_loopback_init()
{

 	SciaRegs.SCICCR.all =0x0007;//// Idle-line mode,// 1 stop bit,  No loopback  // No parity,8 char bits,
	SciaRegs.SCICTL1.all =0x0003;/// enable TX, RX, internal SCICLK,  // Disable RX ERR, SLEEP, TXWAKE
    SciaRegs.SCIHBAUD    =0x0000;
    SciaRegs.SCILBAUD    =0x000F;//BRR=15(0xFF),SCI Asynchronous Baud=292
    ScibRegs.SCICCR.bit.LOOPBKENA =1;///Loop Back test mode enabled bit4[SCICCR]
	SciaRegs.SCICTL1.all =0x0023;//re-enable the SCI by writing a 1 to SW RESET bit-5[SCICTL1]
}
//================Initialize the SCI FIFO==========================//
void scia_fifo_init()
{
    SciaRegs.SCIFFTX.all=0xE040;
    SciaRegs.SCIFFRX.all=0x204f;
    SciaRegs.SCIFFCT.all=0x0;
}

void scib_loopback_init()
{

 	ScibRegs.SCICCR.all =0x0007;// Idle-line mode,// 1 stop bit,  No loopback  // No parity,8 char bits,
	ScibRegs.SCICTL1.all =0x0003;// enable TX, RX, internal SCICLK,  // Disable RX ERR, SLEEP, TXWAKE
    ScibRegs.SCIHBAUD    =0x0000;
    ScibRegs.SCILBAUD    =0x000F;//BRR=15(0xFF),SCI Asynchronous Baud=292
	ScibRegs.SCICCR.bit.LOOPBKENA =0;///Loop Back test mode enabled bit4[SCICCR]
	ScibRegs.SCICTL1.all =0x0023;//re-enable the SCI by writing a 1 to SW RESET bit-5[SCICTL1]
}
//================Initialize the SCI FIFO==========================//
void scib_fifo_init()
{
    ScibRegs.SCIFFTX.all=0xE040;
    ScibRegs.SCIFFRX.all=0x204f;
    ScibRegs.SCIFFCT.all=0x0;
}

void scic_loopback_init()
{

 	ScicRegs.SCICCR.all =0x0007;// Idle-line mode,// 1 stop bit,  No loopback  // No parity,8 char bits,
    ScicRegs.SCICTL1.all =0x0003;/// enable TX, RX, internal SCICLK,  // Disable RX ERR, SLEEP, TXWAKE
    ScicRegs.SCIHBAUD    =0x0000;
    ScicRegs.SCILBAUD    =0x000F;////BRR=15(0xFF),SCI Asynchronous Baud=292
	ScicRegs.SCICCR.bit.LOOPBKENA =1;//Loop Back test mode disabled bit4[SCICCR]
	ScicRegs.SCICTL1.all =0x0023;//re-enable the SCI by writing a 1 to SW RESET bit-5[SCICTL1]////Relinquish SCI from Reset
}

//================Initialize the SCI FIFO==========================//
void scic_fifo_init()
{
    ScicRegs.SCIFFTX.all=0xE040;
    ScicRegs.SCIFFRX.all=0x204f;
    ScicRegs.SCIFFCT.all=0x0;
}

void scia_xmit(int a)    //// Transmit a character from the SCI'
{
    SciaRegs.SCITXBUF=a;
}

void scib_xmit(int a)   //// Transmit a character from the SCI'
{
    ScibRegs.SCITXBUF=a;
}

void scic_xmit(int a)  //// Transmit a character from the SCI'
{
    ScicRegs.SCITXBUF=a;
}
void error()
{
      ErrorCount++;
//    __asm("     ESTOP0");  // Uncomment to stop the test here
//    for (;;);
}

I am doing Uart(SCI) communication. plz suggest me following GPIO initialization correct or not

for  GPIO62 (SCIRXDC)---->  ,GPIO63 (SCITXDC)------>

GpioCtrlRegs.GPBDIR.bit.GPIO62 =0;//RX--I/P
GpioCtrlRegs.GPBDIR.bit.GPIO63 =1;//TX---O/P  ,is the initialization correct or not ?

EALLOW;

GpioCtrlRegs.GPBPUD.bit.GPIO62 = 0; // Enable pull-up for GPIO62 (SCIRXDC)
GpioCtrlRegs.GPBPUD.bit.GPIO63 = 0; // Enable pull-up for GPIO63 (SCITXDC)

GpioCtrlRegs.GPBQSEL2.bit.GPIO62 = 3; // Asynch input GPIO62 (SCIRXDC)

GpioCtrlRegs.GPBMUX2.bit.GPIO62 = 1; // Configure GPIO62 for SCIRXDC operation
GpioCtrlRegs.GPBMUX2.bit.GPIO63 = 1; // Configure GPIO63 for SCITXDC operation

GpioCtrlRegs.GPBDIR.bit.GPIO62 =0;//RX--I/P
GpioCtrlRegs.GPBDIR.bit.GPIO63 =1;//TX---O/P

EDIS;

mahesh joshi said:

while doing the UART communication ,Is it necessary to initialize direction of GPIO ?

Not Required. All you need to do is call InitSciaGpio()/InitScibGpio() routine. You can check the routines for required inits.

Regards,

Gautam

Dear sir,

          below I have initialized  GpIO for Uart . IS the correct or not ?I am not understood that "You can check the routines for required inits.?"

EALLOW;

GpioCtrlRegs.GPBPUD.bit.GPIO62 = 0; // Enable pull-up for GPIO62 (SCIRXDC)
GpioCtrlRegs.GPBPUD.bit.GPIO63 = 0; // Enable pull-up for GPIO63 (SCITXDC)

GpioCtrlRegs.GPBQSEL2.bit.GPIO62 = 3; // Asynch input GPIO62 (SCIRXDC)

GpioCtrlRegs.GPBMUX2.bit.GPIO62 = 1; // Configure GPIO62 for SCIRXDC operation
GpioCtrlRegs.GPBMUX2.bit.GPIO63 = 1; // Configure GPIO63 for SCITXDC operation

EDIS;

Mahesh,

If you are not getting into the ISR check to be sure the interrupts are enabled. You have some code lines commented out, double check if they are needed. Also, check if the INTM, IER, and PIEIER is enabled for the appropriate ISR. From a previous post, setting the GPIO direction is only applicable for when the pin is configured as GPIO (MUX = 00).

- Ken

Dear sir,
I have tried to do SCI communication .problem is when I have send the data (8bit)from herculues ,it doesnot go into receive_interrupt,what should I have to do in such sistuation?