119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
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//###########################################################################
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//
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// FILE: Example_EPwmSetup.c
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//
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// TITLE: EXAMPLE_EPWMSETUP_C EPWM Setup Example
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//
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//! \addtogroup f2833x_example_list
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//! \section EXAMPLE_EPWMSETUP_C EPWM Setup (Example_EPwmSetup.c)
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//!
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//! This file contains source for the ePWM initialization for the
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//! freq calculation module. EPWM1 is set to operate in up-down count
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//! mode at a frequency of 5KHz
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//
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//###########################################################################
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// $TI Release: $
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// $Release Date: $
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// $Copyright:
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// Copyright (C) 2009-2023 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 "DSP28x_Project.h" // Device Headerfile and Examples Include File
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#include "Example_posspeed.h" // Example specific Include file
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//
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// Defines
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//
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#if (CPU_FRQ_150MHZ)
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#define CPU_CLK 150e6
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#endif
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#if (CPU_FRQ_100MHZ)
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#define CPU_CLK 100e6
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#endif
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//
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// 5kHz (300rpm) EPWM1 frequency. Frequency can be changed here
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//
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#define PWM_CLK 5e3
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#define SP CPU_CLK/(2*PWM_CLK)
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#define TBCTLVAL 0x200E // up-down count, timebase=SYSCLKOUT
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//
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// initEpwm -
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//
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void
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initEpwm()
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{
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EPwm1Regs.TBSTS.all=0;
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EPwm1Regs.TBPHS.half.TBPHS =0;
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EPwm1Regs.TBCTR=0;
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EPwm1Regs.CMPCTL.all=0x50; // immediate mode for CMPA and CMPB
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EPwm1Regs.CMPA.half.CMPA=SP/2;
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EPwm1Regs.CMPB=0;
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//
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// CTR=CMPA when inc->EPWM1A=1, when dec->EPWM1A=0
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//
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EPwm1Regs.AQCTLA.all=0x60;
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EPwm1Regs.AQCTLB.all=0x09; // CTR=PRD ->EPWM1B=1, CTR=0 ->EPWM1B=0
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EPwm1Regs.AQSFRC.all=0;
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EPwm1Regs.AQCSFRC.all=0;
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EPwm1Regs.TZSEL.all=0;
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EPwm1Regs.TZCTL.all=0;
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EPwm1Regs.TZEINT.all=0;
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EPwm1Regs.TZFLG.all=0;
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EPwm1Regs.TZCLR.all=0;
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EPwm1Regs.TZFRC.all=0;
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EPwm1Regs.ETSEL.all=0x0A; // Interrupt on PRD
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EPwm1Regs.ETPS.all=1;
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EPwm1Regs.ETFLG.all=0;
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EPwm1Regs.ETCLR.all=0;
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EPwm1Regs.ETFRC.all=0;
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EPwm1Regs.PCCTL.all=0;
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EPwm1Regs.TBCTL.all=0x0010+TBCTLVAL; // Enable Timer
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EPwm1Regs.TBPRD=SP;
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}
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//
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// End of File
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//
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