155 lines
5.8 KiB
C
155 lines
5.8 KiB
C
// TI File $Revision: /main/3 $
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// Checkin $Date: July 27, 2007 11:55:20 $
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//###########################################################################
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//
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// FILE: DSP2833x_EQep.c
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//
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// TITLE: DSP2833x eQEP Initialization & Support Functions.
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//
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//###########################################################################
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// $TI Release: DSP2833x/DSP2823x Header Files V1.20 $
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// $Release Date: August 1, 2008 $
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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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// InitEQep:
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//---------------------------------------------------------------------------
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// This function initializes the eQEP(s) to a known state.
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//
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void InitEQep(void)
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{
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// Initialize eQEP1/2
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//tbd...
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}
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//---------------------------------------------------------------------------
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// Example: InitEQepGpio:
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//---------------------------------------------------------------------------
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// This function initializes GPIO pins to function as eQEP 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 eQEP peripheral
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// Only one GPIO pin should be enabled for EQEPxA operation.
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// Only one GPIO pin should be enabled for EQEPxB operation.
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// Only one GPIO pin should be enabled for EQEPxS operation.
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// Only one GPIO pin should be enabled for EQEPxI operation.
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// Comment out other unwanted lines.
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void InitEQepGpio()
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{
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#if DSP28_EQEP1
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InitEQep1Gpio();
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#endif // endif DSP28_EQEP1
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#if DSP28_EQEP2
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InitEQep2Gpio();
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#endif // endif DSP28_EQEP2
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}
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#if DSP28_EQEP1
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void InitEQep1Gpio(void)
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{
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EALLOW;
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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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GpioCtrlRegs.GPAPUD.bit.GPIO20 = 0; // Enable pull-up on GPIO20 (EQEP1A)
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GpioCtrlRegs.GPAPUD.bit.GPIO21 = 0; // Enable pull-up on GPIO21 (EQEP1B)
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GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0; // Enable pull-up on GPIO22 (EQEP1S)
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GpioCtrlRegs.GPAPUD.bit.GPIO23 = 0; // Enable pull-up on GPIO23 (EQEP1I)
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// GpioCtrlRegs.GPBPUD.bit.GPIO50 = 0; // Enable pull-up on GPIO50 (EQEP1A)
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// GpioCtrlRegs.GPBPUD.bit.GPIO51 = 0; // Enable pull-up on GPIO51 (EQEP1B)
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// GpioCtrlRegs.GPBPUD.bit.GPIO52 = 0; // Enable pull-up on GPIO52 (EQEP1S)
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// GpioCtrlRegs.GPBPUD.bit.GPIO53 = 0; // Enable pull-up on GPIO53 (EQEP1I)
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// Inputs are synchronized to SYSCLKOUT by default.
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// Comment out other unwanted lines.
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GpioCtrlRegs.GPAQSEL2.bit.GPIO20 = 0; // Sync to SYSCLKOUT GPIO20 (EQEP1A)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO21 = 0; // Sync to SYSCLKOUT GPIO21 (EQEP1B)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO22 = 0; // Sync to SYSCLKOUT GPIO22 (EQEP1S)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO23 = 0; // Sync to SYSCLKOUT GPIO23 (EQEP1I)
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// GpioCtrlRegs.GPBQSEL2.bit.GPIO50 = 0; // Sync to SYSCLKOUT GPIO50 (EQEP1A)
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// GpioCtrlRegs.GPBQSEL2.bit.GPIO51 = 0; // Sync to SYSCLKOUT GPIO51 (EQEP1B)
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// GpioCtrlRegs.GPBQSEL2.bit.GPIO52 = 0; // Sync to SYSCLKOUT GPIO52 (EQEP1S)
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// GpioCtrlRegs.GPBQSEL2.bit.GPIO53 = 0; // Sync to SYSCLKOUT GPIO53 (EQEP1I)
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/* Configure eQEP-1 pins using GPIO regs*/
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// This specifies which of the possible GPIO pins will be eQEP1 functional pins.
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// Comment out other unwanted lines.
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GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 1; // Configure GPIO20 as EQEP1A
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GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 1; // Configure GPIO21 as EQEP1B
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GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 1; // Configure GPIO22 as EQEP1S
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GpioCtrlRegs.GPAMUX2.bit.GPIO23 = 1; // Configure GPIO23 as EQEP1I
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// GpioCtrlRegs.GPBMUX2.bit.GPIO50 = 1; // Configure GPIO50 as EQEP1A
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// GpioCtrlRegs.GPBMUX2.bit.GPIO51 = 1; // Configure GPIO51 as EQEP1B
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// GpioCtrlRegs.GPBMUX2.bit.GPIO52 = 1; // Configure GPIO52 as EQEP1S
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// GpioCtrlRegs.GPBMUX2.bit.GPIO53 = 1; // Configure GPIO53 as EQEP1I
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EDIS;
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}
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#endif // if DSP28_EQEP1
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#if DSP28_EQEP2
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void InitEQep2Gpio(void)
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{
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EALLOW;
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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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GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0; // Enable pull-up on GPIO24 (EQEP2A)
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GpioCtrlRegs.GPAPUD.bit.GPIO25 = 0; // Enable pull-up on GPIO25 (EQEP2B)
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GpioCtrlRegs.GPAPUD.bit.GPIO26 = 0; // Enable pull-up on GPIO26 (EQEP2I)
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GpioCtrlRegs.GPAPUD.bit.GPIO27 = 0; // Enable pull-up on GPIO27 (EQEP2S)
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// Inputs are synchronized to SYSCLKOUT by default.
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// Comment out other unwanted lines.
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GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 0; // Sync to SYSCLKOUT GPIO24 (EQEP2A)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO25 = 0; // Sync to SYSCLKOUT GPIO25 (EQEP2B)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO26 = 0; // Sync to SYSCLKOUT GPIO26 (EQEP2I)
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GpioCtrlRegs.GPAQSEL2.bit.GPIO27 = 0; // Sync to SYSCLKOUT GPIO27 (EQEP2S)
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/* Configure eQEP-2 pins using GPIO regs*/
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// This specifies which of the possible GPIO pins will be eQEP2 functional pins.
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// Comment out other unwanted lines.
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GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 2; // Configure GPIO24 as EQEP2A
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GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 2; // Configure GPIO25 as EQEP2B
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GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 2; // Configure GPIO26 as EQEP2I
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GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 2; // Configure GPIO27 as EQEP2S
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EDIS;
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}
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#endif // endif DSP28_EQEP2
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//===========================================================================
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// End of file.
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//===========================================================================
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