28035canboot/flash_programming/source/DSP2803x_Spi.c

//###########################################################################
//
// FILE:   DSP2803x_Spi.c
//
// TITLE:  DSP2803x SPI Initialization & Support Functions.
//
//###########################################################################
// $TI Release: F2803x C/C++ Header Files and Peripheral Examples V130 $
// $Release Date: May  8, 2015 $
// $Copyright: Copyright (C) 2009-2015 Texas Instruments Incorporated -
//             http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################

#include "DSP2803x_Device.h"     // DSP2803x Headerfile Include File
#include "DSP2803x_Examples.h"   // DSP2803x Examples Include File

//---------------------------------------------------------------------------
// InitSPI:
//---------------------------------------------------------------------------
// This function initializes the SPI(s) to a known state.
//
void InitSpi(void)
{
   // Initialize SPI-A

   //tbd...

}

//---------------------------------------------------------------------------
// Example: InitSpiGpio:
//---------------------------------------------------------------------------
// This function initializes GPIO pins to function as SPI pins
//
// Each GPIO pin can be configured as a GPIO pin or up to 3 different
// peripheral functional pins. By default all pins come up as GPIO
// inputs after reset.
//
// Caution:
// For each SPI peripheral
// Only one GPIO pin should be enabled for SPISOMO operation.
// Only one GPIO pin should be enabled for SPISOMI operation.
// Only one GPIO pin should be enabled for SPICLK  operation.
// Only one GPIO pin should be enabled for SPISTE  operation.
// Comment out other unwanted lines.

void InitSpiGpio()
{

   InitSpiaGpio();
 #if DSP28_SPIB
   InitSpibGpio();
 #endif // endif DSP28_SPIB
}

void InitSpiaGpio()
{

   EALLOW;

/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;   // Enable pull-up on GPIO16 (SPISIMOA)
//  GpioCtrlRegs.GPAPUD.bit.GPIO5 = 0;    // Enable pull-up on GPIO5 (SPISIMOA)
    GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0;   // Enable pull-up on GPIO17 (SPISOMIA)
//  GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0;    // Enable pull-up on GPIO3 (SPISOMIA)
    GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;   // Enable pull-up on GPIO18 (SPICLKA)
    GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;   // Enable pull-up on GPIO19 (SPISTEA)

/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // Asynch input GPIO16 (SPISIMOA)
//  GpioCtrlRegs.GPAQSEL1.bit.GPIO5 = 3;  // Asynch input GPIO5 (SPISIMOA)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // Asynch input GPIO17 (SPISOMIA)
//  GpioCtrlRegs.GPAQSEL1.bit.GPIO3 = 3;  // Asynch input GPIO3 (SPISOMIA)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch input GPIO18 (SPICLKA)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // Asynch input GPIO19 (SPISTEA)

/* Configure SPI-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; // Configure GPIO16 as SPISIMOA
//  GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 2;  // Configure GPIO5 as SPISIMOA
    GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1; // Configure GPIO17 as SPISOMIA
//  GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 2;  // Configure GPIO3 as SPISOMIA
    GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; // Configure GPIO18 as SPICLKA
    GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1; // Configure GPIO19 as SPISTEA

    EDIS;
}

#if DSP28_SPIB
void InitSpibGpio()
{
   EALLOW;

/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;     // Enable pull-up on GPIO12 (SPISIMOB)
//  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.GPIO25 = 0;     // Enable pull-up on GPIO25 (SPISOMIB)

    GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;     // Enable pull-up on GPIO14 (SPICLKB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO26 = 0;     // Enable pull-up on GPIO26 (SPICLKB)

    GpioCtrlRegs.GPAPUD.bit.GPIO15 = 0;     // Enable pull-up on GPIO15 (SPISTEB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO27 = 0;     // Enable pull-up on GPIO27 (SPISTEB)


/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 3;   // Asynch input GPIO12 (SPISIMOB)
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 3;   // Asynch input GPIO24 (SPISIMOB)

    GpioCtrlRegs.GPAQSEL1.bit.GPIO13 = 3;   // Asynch input GPIO13 (SPISOMIB)
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO25 = 3;   // Asynch input GPIO25 (SPISOMIB)

    GpioCtrlRegs.GPAQSEL1.bit.GPIO14 = 3;   // Asynch input GPIO14 (SPICLKB)
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO26 = 3;   // Asynch input GPIO26 (SPICLKB)

    GpioCtrlRegs.GPAQSEL1.bit.GPIO15 = 3;   // Asynch input GPIO15 (SPISTEB)
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO27 = 3;   // Asynch input GPIO27 (SPISTEB)

/* Configure SPI-B pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 3;    // Configure GPIO12 as SPISIMOB
//  GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 3;    // Configure GPIO24 as SPISIMOB

    GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 3;    // Configure GPIO13 as SPISOMIB
//  GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 3;    // Configure GPIO25 as SPISOMIB

    GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 3;    // Configure GPIO14 as SPICLKB
//  GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 3;    // Configure GPIO26 as SPICLKB

    GpioCtrlRegs.GPAMUX1.bit.GPIO15 = 3;    // Configure GPIO15 as SPISTEB
//  GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 3;    // Configure GPIO27 as SPISTEB

    EDIS;
}
#endif //endif DSP28_SPIB

//===========================================================================
// End of file.
//===========================================================================