CCS/LAUNCHXL-F28379D: SPI and SPISTE pin

Part Number: LAUNCHXL-F28379D

Tool/software: Code Composer Studio

Hello all,

I write the code that sends data from SPI_A(master) to SPI_B(slave). According to datasheet the SPISTE pin in master before the start of transmission asserted to 0(low) by master and in  end of transmission asserted to 1 (high) by master. In the slave (SPI_B) for receive data the SPISTE pin should asserted to 0 (low). Now I have a question. I asserted SPISTE in slave (SPI_B) to 0 ( I connected this pin to GND of board) and in end of transmission keep this pin to 0 (low) and then sends next data. But the result is incorrect.

and now my question :

Is necessary that the end of transmission of word the SPISTE pin in slave asserted to 1 (high) ?

My code : 

/**
 * main.c
 */

#include "F28x_Project.h"

void spia_config_transmitter (void);
void spia_config_gpio (void);
void spib_config_receiver (void);
void spib_config_gpio (void);

__interrupt void isr_spia_transmitter(void);
__interrupt void isr_spib_receiver(void);

int main(void)
{
    InitSysCtrl();
    DINT;
    IER = 0x0000;
    IFR = 0x0000;
    InitPieCtrl();
    InitPieVectTable();

    EALLOW;
    PieVectTable.SPIA_RX_INT = &isr_spia_transmitter;
    PieVectTable.SPIB_RX_INT = &isr_spib_receiver;
    EDIS;
    PieCtrlRegs.PIECTRL.bit.ENPIE = 1;
    PieCtrlRegs.PIEIER6.bit.INTx1 = 1;
    PieCtrlRegs.PIEIER6.bit.INTx3 = 1;
    IER = M_INT6;
    EINT;

    spia_config_gpio();
    spib_config_gpio();

    spib_config_receiver();
    spia_config_transmitter();

    SpiaRegs.SPITXBUF = 0;
    SpibRegs.SPITXBUF = 0;
    for(;;);

}


void spia_config_transmitter (void)
{
    SpiaRegs.SPICCR.bit.SPISWRESET = 0; // reset SPI for change configuration
    SpiaRegs.SPICTL.bit.MASTER_SLAVE = 1; // setup SPI in master mode
    SpiaRegs.SPICTL.bit.CLK_PHASE = 1; // transmits data in rising edge and receive data in falling edge of SPICLK
    SpiaRegs.SPICCR.bit.CLKPOLARITY = 1;
    SpiaRegs.SPIBRR.bit.SPI_BIT_RATE = 1; // for SPIBRR = 0,1,2 ---> Baud Rate = LSPCLK/4
                                          // for SPIBRR = 3 to 127 ---> Baud Rate = LSPCLK/(SPIBRR+1)
    SpiaRegs.SPICCR.bit.SPICHAR = 15;// SPICHAR = Word length - 1
    SpiaRegs.SPIFFTX.bit.SPIFFENA = 0; // disable FIFO
    SpiaRegs.SPICTL.bit.TALK = 1;
    SpiaRegs.SPICTL.bit.SPIINTENA = 1;
    SpiaRegs.SPICCR.bit.SPILBK = 0;
    SpiaRegs.SPICCR.bit.SPISWRESET = 1; // saving changing of configuration

}

void spia_config_gpio (void)
{
    EALLOW;
    GpioCtrlRegs.GPBGMUX2.bit.GPIO58 = 3;
    GpioCtrlRegs.GPBGMUX2.bit.GPIO59 = 3;
    GpioCtrlRegs.GPBGMUX2.bit.GPIO60 = 3;
    GpioCtrlRegs.GPBGMUX2.bit.GPIO61 = 3;

    GpioCtrlRegs.GPBMUX2.bit.GPIO58 = 3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO59 = 3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO60 = 3;
    GpioCtrlRegs.GPBMUX2.bit.GPIO61 = 3;

    GpioCtrlRegs.GPBQSEL2.bit.GPIO58 = 3;
    GpioCtrlRegs.GPBQSEL2.bit.GPIO59 = 3;
    GpioCtrlRegs.GPBQSEL2.bit.GPIO60 = 3;
    GpioCtrlRegs.GPBQSEL2.bit.GPIO61 = 3;

    GpioCtrlRegs.GPBPUD.bit.GPIO58 = 0;
    GpioCtrlRegs.GPBPUD.bit.GPIO59 = 0;
    GpioCtrlRegs.GPBPUD.bit.GPIO60 = 0;
    GpioCtrlRegs.GPBPUD.bit.GPIO61 = 0;
    EDIS;
}

void spib_config_receiver (void)
{
    SpibRegs.SPICCR.bit.SPISWRESET = 0; // reset SPI for change configuration
    SpibRegs.SPICTL.bit.MASTER_SLAVE = 0; // setup SPI in slave mode
    SpibRegs.SPICTL.bit.CLK_PHASE = 1; // transmits data in rising edge and receive data in falling edge of SPICLK
    SpibRegs.SPICCR.bit.CLKPOLARITY = 1;
    SpibRegs.SPIBRR.bit.SPI_BIT_RATE = 1; // for SPIBRR = 0,1,2 ---> Baud Rate = LSPCLK/4
                                          // for SPIBRR = 3 to 127 ---> Baud Rate = LSPCLK/(SPIBRR+1)
    SpibRegs.SPICCR.bit.SPICHAR = 15;// SPICHAR = Word length - 1
    SpibRegs.SPIFFTX.bit.SPIFFENA = 0; // disable FIFO
    SpibRegs.SPICTL.bit.TALK = 1;
    SpibRegs.SPICTL.bit.SPIINTENA = 1;
    SpibRegs.SPICTL.bit.OVERRUNINTENA = 1;
    SpibRegs.SPICCR.bit.SPISWRESET = 1; // saving changing of configuration

}

void spib_config_gpio (void)
{
    EALLOW;
    GpioCtrlRegs.GPAGMUX2.bit.GPIO24 = 1;
    GpioCtrlRegs.GPAGMUX2.bit.GPIO25 = 1;
    GpioCtrlRegs.GPAGMUX2.bit.GPIO26 = 1;
    GpioCtrlRegs.GPAGMUX2.bit.GPIO27 = 1;

    GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 2;
    GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 2;
    GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 2;
    GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 2;

    GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 3;
    GpioCtrlRegs.GPAQSEL2.bit.GPIO25 = 3;
    GpioCtrlRegs.GPAQSEL2.bit.GPIO26 = 3;
    GpioCtrlRegs.GPAQSEL2.bit.GPIO27 = 3;

    GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO25 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO26 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO27 = 0;
    EDIS;
}

__interrupt void isr_spia_transmitter(void)
{
    static int i = 0;
    static int dummy_data[500];
    dummy_data[i++] = SpiaRegs.SPIRXBUF;
    SpibRegs.SPITXBUF = 500-i;
    SpiaRegs.SPITXBUF = i;
    //ESTOP0;
    if (i == 250)
    {
        SpiaRegs.SPICTL.bit.SPIINTENA = 0;
    }
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;

}
__interrupt void isr_spib_receiver(void)
{
    static int j=0;
    static int rdata[500];
    rdata[j++] = SpibRegs.SPIRXBUF;
    if(j == 500)
    {
        asm(" ESTOP0");
    }
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;

}

the result of received data when the SPISTE in slave (GPIO27) connected to SPISTE in master(GPIO61)

the result of received data when the SPISTE in slave (GPIO27) connected to GND :

Thank you.