427 lines
12 KiB
C
427 lines
12 KiB
C
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//###########################################################################
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//
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// FILE: Example_2833xFlash.c
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//
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// TITLE: ePWM Timer Interrupt From Flash Example
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//
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//! \addtogroup f2833x_example_list
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//! <h1>ePWM Timer Interrupt From Flash (flash_f28335)</h1>
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//!
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//! This example runs the ePWM interrupt example from flash. ePwm1 Interrupt
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//! will run from RAM and puts the flash into sleep mode. ePwm2 Interrupt
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//! will run from RAM and puts the flash into standby mode. ePWM3 Interrupt
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//! will run from FLASH. All timers have the same period. The timers are
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//! started sync'ed. An interrupt is taken on a zero event for each ePWM
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//! timer.GPIO32 is toggled while in the background loop.\n
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//! \b Note: \n
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//! - ePWM1: takes an interrupt every event
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//! - ePWM2: takes an interrupt every 2nd event
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//! - ePWM3: takes an interrupt every 3rd event
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//!
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//! Thus the Interrupt count for ePWM1, ePWM4-ePWM6 should be equal
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//! The interrupt count for ePWM2 should be about half that of ePWM1
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//! and the interrupt count for ePWM3 should be about 1/3 that of ePWM1
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//!
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//! Follow these steps to run the program.
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//! - Build the project
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//! - Flash the .out file into the device.
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//! - Set the hardware jumpers to boot to Flash
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//! - Use the included GEL file to load the project, symbols
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//! defined within the project and the variables into the watch
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//! window.
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//!
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//! Steps that were taken to convert the ePWM example from RAM
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//! to Flash execution:
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//! - Change the linker cmd file to reflect the flash memory map.
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//! - Make sure any initialized sections are mapped to Flash.
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//! In SDFlash utility this can be checked by the View->Coff/Hex
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//! status utility. Any section marked as "load" should be
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//! allocated to Flash.
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//! - Make sure there is a branch instruction from the entry to Flash
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//! at 0x33FFF6 to the beginning of code execution. This example
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//! uses the DSP2833x_CodeStartBranch.__asm file to accomplish this.
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//! - Set boot mode Jumpers to "boot to Flash"
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//! - For best performance from the flash, modify the waitstates
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//! and enable the flash pipeline as shown in this example.
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//! Note: any code that manipulates the flash waitstate and pipeline
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//! control must be run from RAM. Thus these functions are located
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//! in their own memory section called ramfuncs.
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//!
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//! \b Watch \b Variables \n
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//! - EPwm1TimerIntCount
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//! - EPwm2TimerIntCount
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//! - EPwm3TimerIntCount
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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 <string.h>
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//
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// Defines that configure which ePWM timer interrupts are enabled at
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// the PIE level: 1 = enabled, 0 = disabled
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//
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#define PWM1_INT_ENABLE 1
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#define PWM2_INT_ENABLE 1
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#define PWM3_INT_ENABLE 1
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//
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// Defines for the period for each timer
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//
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#define PWM1_TIMER_TBPRD 0x1FFF
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#define PWM2_TIMER_TBPRD 0x1FFF
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#define PWM3_TIMER_TBPRD 0x1FFF
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//
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// Make this long enough so that we can see an LED toggle
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//
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#define DELAY 1000000L
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//
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// Functions that will be run from RAM need to be assigned to
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// a different section. This section will then be mapped using
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// the linker cmd file.
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//
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#ifdef __TI_COMPILER_VERSION__
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#if __TI_COMPILER_VERSION__ >= 15009000
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#pragma CODE_SECTION(epwm1_timer_isr, ".TI.ramfunc");
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#pragma CODE_SECTION(epwm2_timer_isr, ".TI.ramfunc");
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#else
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#pragma CODE_SECTION(epwm1_timer_isr, "ramfuncs");
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#pragma CODE_SECTION(epwm2_timer_isr, "ramfuncs");
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#endif
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#endif
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//
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// Function Prototypes
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//
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__interrupt void epwm1_timer_isr(void);
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__interrupt void epwm2_timer_isr(void);
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__interrupt void epwm3_timer_isr(void);
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void InitEPwmTimer(void);
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//
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// Globals
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//
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Uint32 EPwm1TimerIntCount;
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Uint32 EPwm2TimerIntCount;
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Uint32 EPwm3TimerIntCount;
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Uint32 LoopCount;
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//
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// These are defined by the linker (see F28335.cmd)
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//
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extern Uint16 RamfuncsLoadStart;
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extern Uint16 RamfuncsLoadEnd;
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extern Uint16 RamfuncsRunStart;
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extern Uint16 RamfuncsLoadSize;
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//
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// Main
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//
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void main(void)
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{
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//
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// Step 1. Initialize System Control:
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// PLL, WatchDog, enable Peripheral Clocks
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// This example function is found in the DSP2833x_SysCtrl.c file.
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//
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InitSysCtrl();
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//
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// Step 2. Initialize GPIO:
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// This example function is found in the DSP2833x_Gpio.c file and
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// illustrates how to set the GPIO to it's default state.
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//
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//InitGpio(); // Skipped for this example
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//
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// Step 3. Clear all interrupts and initialize PIE vector table:
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// Disable CPU interrupts
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//
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DINT;
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//
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// Initialize the PIE control registers to their default state.
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// The default state is all PIE interrupts disabled and flags
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// are cleared.
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// This function is found in the DSP2833x_PieCtrl.c file.
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//
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InitPieCtrl();
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//
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// Disable CPU interrupts and clear all CPU interrupt flags
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//
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IER = 0x0000;
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IFR = 0x0000;
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//
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// Initialize the PIE vector table with pointers to the shell Interrupt
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// Service Routines (ISR).
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// This will populate the entire table, even if the interrupt
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// is not used in this example. This is useful for debug purposes.
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// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
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// This function is found in DSP2833x_PieVect.c.
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//
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InitPieVectTable();
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//
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// Interrupts that are used in this example are re-mapped to
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// ISR functions found within this file.
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//
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EALLOW; // This is needed to write to EALLOW protected registers
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PieVectTable.EPWM1_INT = &epwm1_timer_isr;
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PieVectTable.EPWM2_INT = &epwm2_timer_isr;
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PieVectTable.EPWM3_INT = &epwm3_timer_isr;
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EDIS; // This is needed to disable write to EALLOW protected registers
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//
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// Step 4. Initialize all the Device Peripherals:
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// This function is found in DSP2833x_InitPeripherals.c
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//
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//InitPeripherals(); // Not required for this example
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InitEPwmTimer(); // For this example, only initialize the ePWM Timers
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//
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// Step 5. User specific code, enable interrupts
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//
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//
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// Copy time critical code and Flash setup code to RAM
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// This includes the following ISR functions: epwm1_timer_isr(),
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// epwm2_timer_isr(), epwm3_timer_isr and and InitFlash();
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// The RamfuncsLoadStart, RamfuncsLoadEnd, and RamfuncsRunStart
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// symbols are created by the linker. Refer to the F28335.cmd file.
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//
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memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (Uint32)&RamfuncsLoadSize);
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//
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// Call Flash Initialization to setup flash waitstates
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// This function must reside in RAM
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//
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InitFlash();
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//
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// Initialize counters
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//
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EPwm1TimerIntCount = 0;
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EPwm2TimerIntCount = 0;
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EPwm3TimerIntCount = 0;
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LoopCount = 0;
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//
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// Enable CPU INT3 which is connected to EPWM1-3 INT
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//
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IER |= M_INT3;
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//
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// Enable EPWM INTn in the PIE: Group 3 interrupt 1-3
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//
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PieCtrlRegs.PIEIER3.bit.INTx1 = PWM1_INT_ENABLE;
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PieCtrlRegs.PIEIER3.bit.INTx2 = PWM2_INT_ENABLE;
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PieCtrlRegs.PIEIER3.bit.INTx3 = PWM3_INT_ENABLE;
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//
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// Enable global Interrupts and higher priority real-time debug events
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//
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EINT; // Enable Global interrupt INTM
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ERTM; // Enable Global realtime interrupt DBGM
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//
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// Step 6. IDLE loop. Just sit and loop forever (optional)
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//
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EALLOW;
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GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 0;
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GpioCtrlRegs.GPBDIR.bit.GPIO32 = 1;
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EDIS;
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for(;;)
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{
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//
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// This loop will be interrupted, so the overall
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// delay between pin toggles will be longer.
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//
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DELAY_US(DELAY);
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LoopCount++;
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GpioDataRegs.GPBTOGGLE.bit.GPIO32 = 1;
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}
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}
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//
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// InitEPwmTimer -
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//
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void
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InitEPwmTimer()
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{
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EALLOW;
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SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // Stop all the TB clocks
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EDIS;
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//
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// Setup Sync
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//
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EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
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EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
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EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
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//
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// Allow each timer to be sync'ed
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//
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EPwm1Regs.TBCTL.bit.PHSEN = TB_ENABLE;
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EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE;
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EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE;
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EPwm1Regs.TBPHS.half.TBPHS = 100;
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EPwm2Regs.TBPHS.half.TBPHS = 200;
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EPwm3Regs.TBPHS.half.TBPHS = 300;
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EPwm1Regs.TBPRD = PWM1_TIMER_TBPRD;
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EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
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EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
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EPwm1Regs.ETSEL.bit.INTEN = PWM1_INT_ENABLE; // Enable INT
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EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on 1st event
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EPwm2Regs.TBPRD = PWM2_TIMER_TBPRD;
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EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
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EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Enable INT on Zero event
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EPwm2Regs.ETSEL.bit.INTEN = PWM2_INT_ENABLE; // Enable INT
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EPwm2Regs.ETPS.bit.INTPRD = ET_2ND; // Generate INT on 2nd event
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EPwm3Regs.TBPRD = PWM3_TIMER_TBPRD;
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EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
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EPwm3Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Enable INT on Zero event
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EPwm3Regs.ETSEL.bit.INTEN = PWM3_INT_ENABLE; // Enable INT
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EPwm3Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event
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EALLOW;
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SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Start all the timers synced
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EDIS;
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}
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//
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// epwm1_timer_isr -This ISR MUST be executed from RAM as it will put the Flash
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// into Sleep Interrupt routines uses in this example
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//
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__interrupt void
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epwm1_timer_isr(void)
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{
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//
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// Put the Flash to sleep
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//
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EALLOW;
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FlashRegs.FPWR.bit.PWR = FLASH_SLEEP;
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EDIS;
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EPwm1TimerIntCount++;
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//
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// Clear INT flag for this timer
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//
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EPwm1Regs.ETCLR.bit.INT = 1;
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//
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// Acknowledge this interrupt to receive more interrupts from group 3
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|
|
//
|
||
|
|
PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// epwm2_timer_isr - This ISR MUST be executed from RAM as it will put the
|
||
|
|
// Flash into Standby
|
||
|
|
//
|
||
|
|
__interrupt void
|
||
|
|
epwm2_timer_isr(void)
|
||
|
|
{
|
||
|
|
EPwm2TimerIntCount++;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Put the Flash into standby
|
||
|
|
//
|
||
|
|
EALLOW;
|
||
|
|
FlashRegs.FPWR.bit.PWR = FLASH_STANDBY;
|
||
|
|
EDIS;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Clear INT flag for this timer
|
||
|
|
//
|
||
|
|
EPwm2Regs.ETCLR.bit.INT = 1;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Acknowledge this interrupt to receive more interrupts from group 3
|
||
|
|
//
|
||
|
|
PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// epwm3_timer_isr -
|
||
|
|
//
|
||
|
|
__interrupt void
|
||
|
|
epwm3_timer_isr(void)
|
||
|
|
{
|
||
|
|
Uint16 i;
|
||
|
|
|
||
|
|
EPwm3TimerIntCount++;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Short Delay to simulate some ISR Code
|
||
|
|
//
|
||
|
|
for(i = 1; i < 0x01FF; i++)
|
||
|
|
{
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// Clear INT flag for this timer
|
||
|
|
//
|
||
|
|
EPwm3Regs.ETCLR.bit.INT = 1;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Acknowledge this interrupt to receive more interrupts from group 3
|
||
|
|
//
|
||
|
|
PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// End of File
|
||
|
|
//
|
||
|
|
|