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TMS320F28335: SCI transmition between two similar F28335 custom boards

Narasimha
Prodigy 170 points
Part Number: TMS320F28335

Hi all,

         I am working on C28x F28335 Delphino micro-controller custom boards, i want to establish communication between these two similar boards through SCI interface i.e.,SCIB on one and SCIC on another.

        I tried using loop back mechanism for each board separately, it is working good. While, if i remove loop back and connect these custom boards to each other, the most significant nibble on the receiving side is wrong, for example when I'm trying to transmit data (0xAA) from one board and receive the same data on other board i'm able to receive 0x5A or 0x4A instead of 0xAA (correct Data). The Frame error bit of SCIRXBUF is remaining 1 each and every time I transmit the Data. I have tried to check the transmitted data on the TX pin of microcontroller and please refer the attached file. 

       I have configured the SCIFFRX buffer with RXFFIL length as1 byte and RXFFIENA is enabled.  

Here attached my project file.

/**********************************************************************************************************************************************************/

#if 1

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

#pragma CODE_SECTION(InitFlash, "ramfuncs");

#define CPU_FREQ 150E6

#define LSPCLK_FREQ  CPU_FREQ/4

#define SCI_FREQ 100E3

#define SCI_PRD (LSPCLK_FREQ/(SCI_FREQ*8))-1

// Prototype statements for functions found within this file.

//__interrupt void scicTxFifoIsr(void);

__interrupt void scicRxFifoIsr(void);

void scic_fifo_init(void);

void InitScicGpio();

Uint16 rdataB[8];    // Received data for SCI-A

extern Uint16 RamfuncsLoadStart;

extern Uint16 RamfuncsLoadEnd;

extern Uint16 RamfuncsRunStart;

extern Uint16 RamfuncsLoadSize;

void Delay()

{

unsigned int i,j;

for(i = 0;i < 500;i++)

for(j = 0;j < 500;j++);

}

Uint16 Recv_dat = 0x00;

void main(void)

{

   Uint16 i;

   unsigned char SendChar = 0x00;

   InitSysCtrl();

   InitScicGpio();

   DINT;

   InitPieCtrl();

   IER = 0x0000;

   IFR = 0x0000;

   InitPieVectTable();

   MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);

   InitFlash();

   EALLOW;

   PieVectTable.SCIRXINTC = &scicRxFifoIsr;

   EDIS;

   scic_fifo_init();  // Init SCI-B

   PieCtrlRegs.PIECTRL.bit.ENPIE = 1;   // Enable the PIE block

   PieCtrlRegs.PIEIER8.bit.INTx5 = 1;     // PIE Group 9, INT3

   IER |= 0x080;

   EINT;

   while(1)

   {

   for(i = 0;i < 8;i++)

   {

   ScicRegs.SCITXBUF=0x55;//SendChar;

   Delay();Delay();Delay();Delay();

   Delay();Delay();Delay();Delay();

   Delay();Delay();Delay();Delay();

   SendChar++;

   SendChar &= 0xFF;

   }

   Delay();Delay();Delay();Delay();

   }

}

__interrupt void scicRxFifoIsr(void)

{

    Uint16 i;

    Recv_dat = ScicRegs.SCIRXBUF.all; // Read data

ScicRegs.SCIFFRX.bit.RXFFOVRCLR=1;  // Clear Overflow flag

ScicRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag

PieCtrlRegs.PIEACK.all|=0x080;  // Issue PIE ack

}

void scic_fifo_init()

{

   ScicRegs.SCICCR.all =0x0007;    // 1 stop bit,  No loopback

                                   // No parity,8 char bits,

                                   // async mode, idle-line protocol

   ScicRegs.SCICTL1.all =0x0003;   // enable TX, RX, internal SCICLK,

                                   // Disable RX ERR, SLEEP, TXWAKE

//   ScicRegs.SCICTL2.bit.TXINTENA =1;

   ScicRegs.SCICTL2.bit.RXBKINTENA =1;

   ScicRegs.SCIHBAUD    = 0x01;

   ScicRegs.SCILBAUD    = 0xE7;//SCI_PRD;

   ScicRegs.SCICCR.bit.LOOPBKENA =0; // Enable loop back

   ScicRegs.SCIFFTX.all=0xC021;

   ScicRegs.SCIFFRX.all=0x0021;

   ScicRegs.SCIFFCT.all=0x00;

   ScicRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset

  ScicRegs.SCIFFTX.bit.TXFIFOXRESET=1;

   ScicRegs.SCIFFRX.bit.RXFIFORESET=1;

}

void InitScicGpio()

{

   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;   // Configure GPIO63 for SCITXDC operation

// GpioCtrlRegs.GPBDIR.bit.GPIO63 = 1;   // Configure GPIO63 for SCITXDC operation

    EDIS;

}

#endif

Tx_Card.c
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#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
#pragma CODE_SECTION(InitFlash, "ramfuncs");
#define CPU_FREQ 150E6
#define LSPCLK_FREQ CPU_FREQ/4
#define SCI_FREQ 100E3
#define SCI_PRD (LSPCLK_FREQ/(SCI_FREQ*8))-1
// Prototype statements for functions found within this file.
__interrupt void scibTxFifoIsr(void);
__interrupt void scibRxFifoIsr(void);
void scib_fifo_init(void);
Uint16 rdataB[8]; // Received data for SCI-A
extern Uint16 RamfuncsLoadStart;
extern Uint16 RamfuncsLoadEnd;
extern Uint16 RamfuncsRunStart;
extern Uint16 RamfuncsLoadSize;
void Delay()
{
unsigned int i,j;
for(i = 0;i < 500;i++)
for(j = 0;j < 500;j++);
}
unsigned char Recv_dat = 0x00;
void main(void)
{
Uint16 i;
unsigned char SendChar = 0x00;
InitSysCtrl();
InitSciGpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);
InitFlash();
EALLOW;
PieVectTable.SCIRXINTB = &scibRxFifoIsr;
// PieVectTable.SCITXINTB = &scibTxFifoIsr;
EDIS;
scib_fifo_init(); // Init SCI-B
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER9.bit.INTx3=1; // PIE Group 9, INT3
// PieCtrlRegs.PIEIER9.bit.INTx4=1; // PIE Group 9, INT4
IER = 0x100;
EINT;
while(1)
{
ScibRegs.SCITXBUF=0xAA;
Delay();Delay();Delay();Delay();
Delay();Delay();Delay();Delay();
Delay();Delay();Delay();Delay();
SendChar++;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Rx_Card.c
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#if 1
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
#pragma CODE_SECTION(InitFlash, "ramfuncs");
#define CPU_FREQ 150E6
#define LSPCLK_FREQ CPU_FREQ/4
#define SCI_FREQ 100E3
#define SCI_PRD (LSPCLK_FREQ/(SCI_FREQ*8))-1
// Prototype statements for functions found within this file.
//__interrupt void scicTxFifoIsr(void);
__interrupt void scicRxFifoIsr(void);
void scic_fifo_init(void);
void InitScicGpio();
Uint16 rdataB[8]; // Received data for SCI-A
extern Uint16 RamfuncsLoadStart;
extern Uint16 RamfuncsLoadEnd;
extern Uint16 RamfuncsRunStart;
extern Uint16 RamfuncsLoadSize;
void Delay()
{
unsigned int i,j;
for(i = 0;i < 500;i++)
for(j = 0;j < 500;j++);
}
Uint16 Recv_dat = 0x00;
void main(void)
{
Uint16 i;
unsigned char SendChar = 0x00;
InitSysCtrl();
InitScicGpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);
InitFlash();
EALLOW;
PieVectTable.SCIRXINTC = &scicRxFifoIsr;
// PieVectTable.SCITXINTB = &scibTxFifoIsr;
EDIS;
scic_fifo_init(); // Init SCI-B
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER8.bit.INTx5 = 1; // PIE Group 9, INT3
// PieCtrlRegs.PIEIER8.bit.INTx6=1; // PIE Group 9, INT4
IER |= 0x080;
EINT;
while(1)
{
for(i = 0;i < 8;i++)
{
ScicRegs.SCITXBUF=0x55;//SendChar;
Delay();Delay();Delay();Delay();
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Thanks in Advance,

Narsimha.


#if 1#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File
#pragma CODE_SECTION(InitFlash, "ramfuncs");
#define CPU_FREQ 150E6#if 1#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File
#pragma CODE_SECTION(InitFlash, "ramfuncs");
#define CPU_FREQ 150E6#define LSPCLK_FREQ  CPU_FREQ/4#define SCI_FREQ 100E3#define SCI_PRD (LSPCLK_FREQ/(SCI_FREQ*8))-1
// Prototype statements for functions found within this file.//__interrupt void scicTxFifoIsr(void);__interrupt void scicRxFifoIsr(void);void scic_fifo_init(void);void InitScicGpio();
Uint16 rdataB[8];    // Received data for SCI-A
extern Uint16 RamfuncsLoadStart;extern Uint16 RamfuncsLoadEnd;extern Uint16 RamfuncsRunStart;extern Uint16 RamfuncsLoadSize;
void Delay(){ unsigned int i,j; for(i = 0;i < 500;i++) for(j = 0;j < 500;j++);}
Uint16 Recv_dat = 0x00;void main(void){   Uint16 i;   unsigned char SendChar = 0x00;
   InitSysCtrl();   InitScicGpio();   DINT;
   InitPieCtrl();   IER = 0x0000;   IFR = 0x0000;   InitPieVectTable();
   MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);   InitFlash();
   EALLOW;   PieVectTable.SCIRXINTC = &scicRxFifoIsr;   EDIS;
   scic_fifo_init();  // Init SCI-B
   PieCtrlRegs.PIECTRL.bit.ENPIE = 1;   // Enable the PIE block   PieCtrlRegs.PIEIER8.bit.INTx5 = 1;     // PIE Group 9, INT3   IER |= 0x080;   EINT;
   while(1)   {    for(i = 0;i < 8;i++)    {    ScicRegs.SCITXBUF=0xAA;//SendChar;    Delay();Delay();Delay();Delay();    Delay();Delay();Delay();Delay();//    Delay();Delay();Delay();Delay();//    while(ScicRegs.SCIFFTX.bit.TXFFST != 0);    SendChar++;    SendChar &= 0xFF;    }    Delay();Delay();Delay();Delay();   }}
__interrupt void scicRxFifoIsr(void){
Recv_dat = ScicRegs.SCIRXBUF.all; // Read data
ScicRegs.SCIFFRX.bit.RXFFOVRCLR=1;  // Clear Overflow flag ScicRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag PieCtrlRegs.PIEACK.all|=0x080;  // Issue PIE ack}
void scic_fifo_init(){   ScicRegs.SCICCR.all =0x0007;    // 1 stop bit,  No loopback                                   // No parity,8 char bits,                                   // async mode, idle-line protocol   ScicRegs.SCICTL1.all =0x0003;   // enable TX, RX, internal SCICLK,                                   // Disable RX ERR, SLEEP, TXWAKE//   ScicRegs.SCICTL2.bit.TXINTENA =1;   ScicRegs.SCICTL2.bit.RXBKINTENA =1;   ScicRegs.SCIHBAUD    = 0x01;   ScicRegs.SCILBAUD    = 0xE7;//SCI_PRD;   ScicRegs.SCICCR.bit.LOOPBKENA =0; // Enable loop back   ScicRegs.SCIFFTX.all=0xC021;   ScicRegs.SCIFFRX.all=0x0021;   ScicRegs.SCIFFCT.all=0x00;
   ScicRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset   ScicRegs.SCIFFTX.bit.TXFIFOXRESET=1;   ScicRegs.SCIFFRX.bit.RXFIFORESET=1;}
void InitScicGpio(){   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;   // Configure GPIO63 for SCITXDC operation// GpioCtrlRegs.GPBDIR.bit.GPIO63 = 1;   // Configure GPIO63 for SCITXDC operation    EDIS;}#endif

#define LSPCLK_FREQ  CPU_FREQ/4#define SCI_FREQ 100E3#define SCI_PRD (LSPCLK_FREQ/(SCI_FREQ*8))-1
// Prototype statements for functions found within this file.//__interrupt void scicTxFifoIsr(void);__interrupt void scicRxFifoIsr(void);void scic_fifo_init(void);void InitScicGpio();
Uint16 rdataB[8];    // Received data for SCI-A
extern Uint16 RamfuncsLoadStart;extern Uint16 RamfuncsLoadEnd;extern Uint16 RamfuncsRunStart;extern Uint16 RamfuncsLoadSize;
void Delay(){ unsigned int i,j; for(i = 0;i < 500;i++) for(j = 0;j < 500;j++);}
Uint16 Recv_dat = 0x00;void main(void){   Uint16 i;   unsigned char SendChar = 0x00;
   InitSysCtrl();   InitScicGpio();   DINT;
   InitPieCtrl();   IER = 0x0000;   IFR = 0x0000;   InitPieVectTable();
   MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);   InitFlash();
   EALLOW;   PieVectTable.SCIRXINTC = &scicRxFifoIsr;//   PieVectTable.SCITXINTB = &scibTxFifoIsr;   EDIS;
   scic_fifo_init();  // Init SCI-B
   PieCtrlRegs.PIECTRL.bit.ENPIE = 1;   // Enable the PIE block   PieCtrlRegs.PIEIER8.bit.INTx5 = 1;     // PIE Group 9, INT3//   PieCtrlRegs.PIEIER8.bit.INTx6=1;     // PIE Group 9, INT4   IER |= 0x080;   EINT;
   while(1)   {    for(i = 0;i < 8;i++)    {    ScicRegs.SCITXBUF=0x55;//SendChar;    Delay();Delay();Delay();Delay();    Delay();Delay();Delay();Delay();    ScicRegs.SCICTL1.bit.RXENA = 1;//    Delay();Delay();Delay();Delay();//    while(ScicRegs.SCIFFTX.bit.TXFFST != 0);    SendChar++;    SendChar &= 0xFF;    }    Delay();Delay();Delay();Delay();   }}
__interrupt void scicRxFifoIsr(void){    Uint16 i;unsigned char dat = 0x0, dat1 = 0x0;
//    dat = ScicRegs.SCIRXST.bit.RXRDY;//Recv_dat = ScicRegs.SCIRXEMU; // Read data
    Recv_dat = ScicRegs.SCIRXBUF.all; // Read data//    dat = ScicRegs.SCIRXST.all;//    dat1 = ScicRegs.SCIRXST.bit.RXRDY;    for(i=0;i<8;i++) {//    rdataB[i] = ScicRegs.SCIRXBUF.all; // Read data }
ScicRegs.SCIFFRX.bit.RXFFOVRCLR=1;  // Clear Overflow flag ScicRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag PieCtrlRegs.PIEACK.all|=0x080;  // Issue PIE ack}
void scic_fifo_init(){   ScicRegs.SCICCR.all =0x0005;    // 1 stop bit,  No loopback                                   // No parity,8 char bits,                                   // async mode, idle-line protocol   ScicRegs.SCICTL1.all =0x0002;   // enable TX, RX, internal SCICLK,                                   // Disable RX ERR, SLEEP, TXWAKE//   ScicRegs.SCICTL2.bit.TXINTENA =1;   ScicRegs.SCICTL2.bit.RXBKINTENA =1;   ScicRegs.SCIHBAUD    = 0x01;   ScicRegs.SCILBAUD    = 0xE7;//SCI_PRD;   ScicRegs.SCICCR.bit.LOOPBKENA =0; // Enable loop back   ScicRegs.SCIFFTX.all=0xC021;   ScicRegs.SCIFFRX.all=0x0021;   ScicRegs.SCIFFCT.all=0x00;
   ScicRegs.SCICTL1.all =0x0022;     // Relinquish SCI from Reset   ScicRegs.SCIFFTX.bit.TXFIFOXRESET=1;   ScicRegs.SCIFFRX.bit.RXFIFORESET=1;}
void InitScicGpio(){   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;   // Configure GPIO63 for SCITXDC operation// GpioCtrlRegs.GPBDIR.bit.GPIO63 = 1;   // Configure GPIO63 for SCITXDC operation    EDIS;}#endif

  • 0
    TI__Mastermind 42195 points

    Narsimha,

    I didn't look into what data you are sending, however it sounds like you may have your baud rates close(maybe off by an integer multiple), but not correct. Enable XCLKOUT and check the frequency of each device. After verifying the PLL frequencies verify the baud rate settings of both devices at run time.

    A good debug technique would be to find a third device, maybe a putty terminal, and communicate with the putty terminal to each of the two devices.

    Regards,
    Cody