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145 lines
5.5 KiB
C
145 lines
5.5 KiB
C
// TI File $Revision: /main/1 $
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// Checkin $Date: August 18, 2006 13:46:44 $
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//###########################################################################
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//
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// FILE: DSP2833x_Spi.c
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//
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// TITLE: DSP2833x SPI Initialization & Support Functions.
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//
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//###########################################################################
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// $TI Release: 2833x/2823x Header Files V1.32 $
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// $Release Date: June 28, 2010 $
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// $Copyright:
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// Copyright (C) 2009-2024 Texas Instruments Incorporated - http://www.ti.com/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// $
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//###########################################################################
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//
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// Included Files
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//
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#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
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#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
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//
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// InitSPI - This function initializes the SPI(s) to a known state.
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//
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void
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InitSpi(void)
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{
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//
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// Initialize SPI-A/B/C/D
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//
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}
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//
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// InitSpiGpio - This function initializes GPIO pins to function as SPI pins
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//
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// Each GPIO pin can be configured as a GPIO pin or up to 3 different
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// peripheral functional pins. By default all pins come up as GPIO
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// inputs after reset.
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//
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// Caution:
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// For each SPI peripheral
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// Only one GPIO pin should be enabled for SPISOMO operation.
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// Only one GPIO pin should be enabled for SPISOMI operation.
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// Only one GPIO pin should be enabled for SPICLKA operation.
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// Only one GPIO pin should be enabled for SPISTEA operation.
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// Comment out other unwanted lines.
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//
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void
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InitSpiGpio()
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{
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InitSpiaGpio();
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}
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//
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// InitSpiaGpio - This function initializes GPIO poins to function as SPI pins
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//
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void
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InitSpiaGpio()
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{
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EALLOW;
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//
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// Enable internal pull-up for the selected pins
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// Pull-ups can be enabled or disabled by the user.
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// This will enable the pullups for the specified pins.
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// Comment out other unwanted lines.
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//
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GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0; //Enable pull-up on GPIO16 (SPISIMOA)
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GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0; //Enable pull-up on GPIO17 (SPISOMIA)
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GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0; //Enable pull-up on GPIO18 (SPICLKA)
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GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0; //Enable pull-up on GPIO19 (SPISTEA)
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//GpioCtrlRegs.GPBPUD.bit.GPIO54 = 0; //Enable pull-up on GPIO54 (SPISIMOA)
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//GpioCtrlRegs.GPBPUD.bit.GPIO55 = 0; //Enable pull-up on GPIO55 (SPISOMIA)
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//GpioCtrlRegs.GPBPUD.bit.GPIO56 = 0; //Enable pull-up on GPIO56 (SPICLKA)
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//GpioCtrlRegs.GPBPUD.bit.GPIO57 = 0; //Enable pull-up on GPIO57 (SPISTEA)
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//
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// Set qualification for selected pins to asynch only
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// This will select asynch (no qualification) for the selected pins.
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// Comment out other unwanted lines.
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//
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GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // Asynch input GPIO16 (SPISIMOA)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // Asynch input GPIO17 (SPISOMIA)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch input GPIO18 (SPICLKA)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // Asynch input GPIO19 (SPISTEA)
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//GpioCtrlRegs.GPBQSEL2.bit.GPIO54 = 3; // Asynch input GPIO16 (SPISIMOA)
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//GpioCtrlRegs.GPBQSEL2.bit.GPIO55 = 3; // Asynch input GPIO17 (SPISOMIA)
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//GpioCtrlRegs.GPBQSEL2.bit.GPIO56 = 3; // Asynch input GPIO18 (SPICLKA)
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//GpioCtrlRegs.GPBQSEL2.bit.GPIO57 = 3; // Asynch input GPIO19 (SPISTEA)
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//
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// Configure SPI-A pins using GPIO regs
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// This specifies which of the possible GPIO pins will be SPI
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// functional pins.
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// Comment out other unwanted lines.
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//
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GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; // Configure GPIO16 as SPISIMOA
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GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1; // Configure GPIO17 as SPISOMIA
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GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; // Configure GPIO18 as SPICLKA
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GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1; // Configure GPIO19 as SPISTEA
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//GpioCtrlRegs.GPBMUX2.bit.GPIO54 = 1; // Configure GPIO54 as SPISIMOA
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//GpioCtrlRegs.GPBMUX2.bit.GPIO55 = 1; // Configure GPIO55 as SPISOMIA
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//GpioCtrlRegs.GPBMUX2.bit.GPIO56 = 1; // Configure GPIO56 as SPICLKA
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//GpioCtrlRegs.GPBMUX2.bit.GPIO57 = 1; // Configure GPIO57 as SPISTEA
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EDIS;
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}
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//
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// End of file
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//
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