how to communicate 8 bit data in spi protocol from piccolo f28069

reading sprug71b.pdf (page 30) I see that the sending buffer SPITXBUF must be left-justified. and since his data is 8bit, it should be something like 

SPITXBUF=(data_to_Send <<8);

ins't it? or is it just sufficient to put the SPICCR register to 8bit character length? 

Dear Emanuel Eni,

thanks for reply and i done the communication of 8 bit in piccolo. i observed that what ever the length the first bit coming out is msb that is 16 bit so we need to shift over msb bit to 16 bit like i m using 8 bit communication so i need to shift 8 bit to 16 bit before sending the  SPITXBUF so that 8 bits are shifted to 16 to 9 bits and what ever u suggested is also right    

Hi Pradeep and TI community,

I am also trying to use Piccolo spi for 8 bit communication. SPIB is acting as master. I have wired issue that MISO line is always high but data is pushed onto MISO line.

Can you review below code based on your experience:

================================

GPIO init - for clk, miso and mosi.

GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 3; // Configure GPIO24 as SPISIMOB
GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 3; // Configure GPIO13 as SPISOMIB
GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 3; // Configure GPIO14 as SPICLKB

GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0; // Enable pull-up on GPIO24 (SPISIMOB)
GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0; // Enable pull-up on GPIO13 (SPISOMIB)
GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0; // Enable pull-up on GPIO14 (SPICLKB)

GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 3; // Asynch input GPIO24 (SPISIMOB)
GpioCtrlRegs.GPAQSEL1.bit.GPIO13 = 3; // Asynch input GPIO13 (SPISOMIB)
GpioCtrlRegs.GPAQSEL1.bit.GPIO14 = 3; // Asynch input GPIO14 (SPICLKB)

===============================

SPI initialization

void SPI_Init(void)
{

EALLOW;

SpibRegs.SPICCR.all =0x000F; // Reset on, rising edge, 16-bit char bits
SpibRegs.SPICTL.all =0x000F; // Enable master mode, normal phase,
// enable talk, and SPI int disabled.
SpibRegs.SPIBRR =0x007F;
SpibRegs.SPICCR.all =0x0007; // Relinquish SPI from Reset
SpibRegs.SPIPRI.bit.FREE = 1; // Set so breakpoints don't disturb xmission
SpibRegs.SPICCR.bit.SPISWRESET = 1;

EDIS;
}

================

SPI read and SPI write API

Uint16 SPI0_Read()
{

SpibRegs.SPITXBUF=(0x00<<8);

while(SpibRegs.SPISTS.bit.INT_FLAG !=1) { }
rdata = (Uint16)(SpibRegs.SPIRXBUF);
rdata = (rdata>>8);
return (rdata);

}

Uint16 SPI0_Write(Uint16 data)
{
Uint16 rdata;
SpibRegs.SPITXBUF=(data<<8);

while(SpibRegs.SPISTS.bit.INT_FLAG !=1) { }
rdata = SpibRegs.SPIRXBUF;

}

Thanks for your help.

Below is pic of output i am getting. (1 is clock, 2. is CS, 3 is MISO, and 4 is MOSI)