LAUNCHXL-F280049C: SCI

Hi,

I am trying to  implement SCI by just only checking TXRDY and RXRDY flag bit. So I am not  using TX and Rx interrupt. I set baud rate at 9600 but data is not coming correctly.

I am unable to find what is wrong in code. I have attached my code and terminal output .

Please help me to overcome this issue.

Regards,

Deepak Agrawal

#include "F28x_Project.h"

//#define LSPCLK    25E6
//#define Baud_rate 9600
//#define Divider   (uint16_t)((LSPCLK / (Baud_rate * 8U)) - 1U)
//
// Main
//

void initSCIAEchoback(void);
void transmitChar(uint16_t a);
void transmitMessage(unsigned char *msg);

void main(void)
{
    uint16_t ReceivedChar;
    unsigned char *msg;

    // Initialize device clock and peripherals
    InitSysCtrl();

    // Initialize GPIO
    InitGpio();

    // GPIO_SetupPinMux() - Sets the GPxMUX1/2 and GPyMUX1/2 register bits
    // GPIO_SetupPinOptions() - Sets the direction and configuration of GPIOs

    GPIO_SetupPinMux(28, GPIO_MUX_CPU1, 1);
    GPIO_SetupPinOptions(28, GPIO_INPUT, GPIO_PUSHPULL);
    GPIO_SetupPinMux(29, GPIO_MUX_CPU1, 1);
    GPIO_SetupPinOptions(29, GPIO_OUTPUT, GPIO_ASYNC);

    // 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.
    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)
    InitPieVectTable();

    initSCIAEchoback();

    msg = "\r\n\n\nHello World!\0";
    transmitMessage(msg);

    msg = "\r\nYou will enter a character, and the DSP will echo it back!\n\0";
    transmitMessage(msg);

    for(;;)
    {
        msg = "\r\nEnter a character: \0";
        transmitMessage(msg);

        // wait for character
        while(!SciaRegs.SCIRXST.bit.RXRDY)
        {

        }

        ReceivedChar = SciaRegs.SCIRXBUF.all;

        msg = "  You sent: \0";
        transmitMessage(msg);
        transmitChar(ReceivedChar);
    }

}

void initSCIAEchoback(void)
{
    /* Communication control register SCICCR*/
    SciaRegs.SCICCR.all = 0x0003; // one stop bit; no parity bit;
                                  // loop back test mode disabled; idle-line mode;
                                  // 8 character length

    /* control register 1 */
    SciaRegs.SCICTL1.all = 0x0003; // Tx and Rx enabled;
                                   // wake and sleep disabled

    /* Baud rate registers */
    SciaRegs.SCIHBAUD.all = 0x0001;
    SciaRegs.SCILBAUD.all = 0x0044;

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

}

void transmitChar(uint16_t a)
{
    while(!SciaRegs.SCICTL2.bit.TXRDY)
    {

    }
    SciaRegs.SCITXBUF.all = a;

}

void transmitMessage(unsigned char *msg)
{
    int i;
    i = 0;
    while(msg[i] != '\0')
    {
        transmitChar(msg[i]);
        i++;
    }
}