343 lines
12 KiB
C
343 lines
12 KiB
C
// TI File $Revision: /main/10 $
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// Checkin $Date: April 21, 2008 15:42:33 $
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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: DSP2833x ePWM Timer Interrupt From Flash Example.
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//
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// ASSUMPTIONS:
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//
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// This program requires the DSP2833x header files.
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//
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// As supplied, this project is configured for "boot to FLASH"
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// operation. The 2833x Boot Mode table is shown below.
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// For information on configuring the boot mode of an eZdsp,
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// please refer to the documentation included with the eZdsp,
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//
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// $Boot_Table:
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//
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// GPIO87 GPIO86 GPIO85 GPIO84
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// XA15 XA14 XA13 XA12
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// PU PU PU PU
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// ==========================================
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// 1 1 1 1 Jump to Flash <- "boot to Flash"
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// 1 1 1 0 SCI-A boot
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// 1 1 0 1 SPI-A boot
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// 1 1 0 0 I2C-A boot
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// 1 0 1 1 eCAN-A boot
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// 1 0 1 0 McBSP-A boot
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// 1 0 0 1 Jump to XINTF x16
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// 1 0 0 0 Jump to XINTF x32
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// 0 1 1 1 Jump to OTP
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// 0 1 1 0 Parallel GPIO I/O boot
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// 0 1 0 1 Parallel XINTF boot
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// 0 1 0 0 Jump to SARAM
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// 0 0 1 1 Branch to check boot mode
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// 0 0 1 0 Boot to flash, bypass ADC cal
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// 0 0 0 1 Boot to SARAM, bypass ADC cal
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// 0 0 0 0 Boot to SCI-A, bypass ADC cal
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// Boot_Table_End$
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//
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// DESCRIPTION:
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//
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// This example runs the ePWM interrupt example from flash.
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//
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// 1) Build the project
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// 2) Flash the .out file into the device.
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// 3) Set the hardware jumpers to boot to Flash
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// 4) 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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//
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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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//
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// ePwm1 Interrupt will run from RAM and puts the flash into sleep mode
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// ePwm2 Interrupt will run from RAM and puts the flash into standby mode
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// ePWM3 Interrupt will run from FLASH
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//
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// As supplied:
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//
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// All timers have the same period
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// The timers are started sync'ed
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// An interrupt is taken on a zero event for each ePWM timer
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//
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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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// Watch Variables:
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// EPwm1TimerIntCount
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// EPwm2TimerIntCount
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// EPwm3TimerIntCount
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//
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// Toggle GPIO32 while in the background loop.
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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 "DSP28x_Project.h" // Device Headerfile and Examples Include File
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// Configure which ePWM timer interrupts are enabled at the PIE level:
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// 1 = enabled, 0 = disabled
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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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// Configure the period for each timer
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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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// Make this long enough so that we can see an LED toggle
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#define DELAY 1000000L
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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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#pragma CODE_SECTION(epwm1_timer_isr, "ramfuncs");
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#pragma CODE_SECTION(epwm2_timer_isr, "ramfuncs");
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// Prototype statements for functions found within this file.
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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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// Global variables used in this example
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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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// These are defined by the linker (see F28335.cmd)
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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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void main(void)
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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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InitSysCtrl();
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// Step 2. Initalize 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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// InitGpio(); // Skipped for this example
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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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DINT;
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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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InitPieCtrl();
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// Disable CPU interrupts and clear all CPU interrupt flags:
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IER = 0x0000;
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IFR = 0x0000;
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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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InitPieVectTable();
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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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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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// Step 4. Initialize all the Device Peripherals:
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// This function is found in DSP2833x_InitPeripherals.c
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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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// Step 5. User specific code, enable interrupts:
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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(), epwm2_timer_isr()
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// 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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MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);
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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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InitFlash();
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// Initalize counters:
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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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// Enable CPU INT3 which is connected to EPWM1-3 INT:
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IER |= M_INT3;
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// Enable EPWM INTn in the PIE: Group 3 interrupt 1-3
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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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// Enable global Interrupts and higher priority real-time debug events:
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EINT; // Enable Global interrupt INTM
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ERTM; // Enable Global realtime interrupt DBGM
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// Step 6. IDLE loop. Just sit and loop forever (optional):
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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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// This loop will be interrupted, so the overall
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// delay between pin toggles will be longer.
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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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void 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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// Setup Sync
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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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// Allow each timer to be sync'ed
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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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// This ISR MUST be executed from RAM as it will put the Flash into Sleep
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// Interrupt routines uses in this example:
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interrupt void epwm1_timer_isr(void)
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{
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// Put the Flash to sleep
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FlashRegs.FPWR.bit.PWR = FLASH_SLEEP;
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EPwm1TimerIntCount++;
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// Clear INT flag for this timer
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EPwm1Regs.ETCLR.bit.INT = 1;
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// Acknowledge this interrupt to receive more interrupts from group 3
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PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
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}
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// This ISR MUST be executed from RAM as it will put the Flash into Standby
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interrupt void epwm2_timer_isr(void)
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{
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EPwm2TimerIntCount++;
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// Put the Flash into standby
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FlashRegs.FPWR.bit.PWR = FLASH_STANDBY;
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// Clear INT flag for this timer
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EPwm2Regs.ETCLR.bit.INT = 1;
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// Acknowledge this interrupt to receive more interrupts from group 3
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PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
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}
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interrupt void epwm3_timer_isr(void)
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{
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Uint16 i;
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EPwm3TimerIntCount++;
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// Short Delay to simulate some ISR Code
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for(i = 1; i < 0x01FF; i++) {}
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// Clear INT flag for this timer
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EPwm3Regs.ETCLR.bit.INT = 1;
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// Acknowledge this interrupt to receive more interrupts from group 3
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PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
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}
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//===========================================================================
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// No more.
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//===========================================================================
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