Hi,
Got the three phase spwm program from the forum for switching frequency of 2050Hz, can anyone plz help to get the switching frequency of 100Hz.
Program for 2050Hz switching frequency is below
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//----------------------------------------------------------------------------------- //----------------------------------------------------------------------------------- // Ioannis Pallis, 2014 // This code implements 3-phase sinusoidal PWM. // // The user sets the frequency of the SPWM by setting appropriately the // EPWM1_TIMER_TBPRD variable. The frequency of the PWM,up and down mode, // obeys the equations: TPWM=2xTBPRDxTTBCLK, TTBCLK=SYSCLKOUT/(HSPCLKDIVxCLKDIV). // By default: HSPCLKDIV=2, CLKDIV=1. // // The sine for the PWM is read by the chip ROM. The sine table consists of // 512 elements. // The frequency of sinusoidal PWM is defined by the period of the timer0 interrupt. // For 50Hz the sine table must be read, entirely in 20msec. This means that the // timer0 interrupt must occur in every 20/512 msec. // The general type for the is Ttimer=Tsin*Fcpu/index. // // The 120 degrees difference of the sine are set by the variables: // index = 0, zero degrees // index2= 170, 120 degrees // index3=340, for 240 degrees // // //------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------ #include <stdio.h> #include <file.h> #include "DSP28x_Project.h" // DSP28x Headerfile #include "f2802x_common/include/F2802x_GlobalPrototypes.h" #include "f2802x_common/include/pll.h" #include "f2802x_common/include/clk.h" #include "f2802x_common/include/wdog.h" #include "f2802x_common/include/flash.h" #include "f2802x_common/include/gpio.h" #include "f2802x_common/include/pie.h" #include "f2802x_common/include/adc.h" #include "f2802x_common/include/sci.h" #include "f2802x_common/include/sci_io.h" #include "f2802x_common/include/pwm.h" #include "f2802x_common/include/timer.h" #include "f2802x_common/include/IQmathLib.h" //IQmath Library header file extern void DSP28x_usDelay(Uint32 Count); #pragma DATA_SECTION(sine_table,"IQmathTables"); //IQmath ROM sine table _iq30 sine_table[512]; //Interrupt prototype function for timer0 interrupt void cpu_timer0_isr(void); void update_compare(void); //Global PWM variables #define EPWM1_TIMER_TBPRD 14634 // Period register for 2050.2Hz #define PHASE 120.0 // Defines the real in degrees phase between phases, 120deg #define TTIMERREG 2343 // Timer interrupt for 50Hz SPWM Uint16 EPWM_PHASE=(EPWM1_TIMER_TBPRD*PHASE/180.0); //The phase as seen from the EPWM module Uint16 duty_cycle_A=1000; // Set duty 50% initially Uint16 duty_cycle_B=1000; // Set duty 50% initially Uint16 index=0; // Zero degrees sine Uint16 index2=170; // 120 degrees sine difference Uint16 index3=340; // 240 degrees sine difffence Uint16 DEADTIME_R=5.0; // Deadtime 5usec Uint16 DEADTIME_F=5.0; // Deadtime 5usec // Handles setup CPU_Handle myCpu; PLL_Handle myPll; WDOG_Handle myWDog; CLK_Handle myClk; ADC_Handle myAdc; FLASH_Handle myFlash; GPIO_Handle myGpio; PIE_Handle myPie; SCI_Handle mySci; PWM_Handle PWMA,PWMB,PWMC; TIMER_Handle myTimer0; // Handles initialization void setup_handles() { myClk = CLK_init((void *)CLK_BASE_ADDR, sizeof(CLK_Obj)); myPll = PLL_init((void *)PLL_BASE_ADDR, sizeof(PLL_Obj)); myWDog = WDOG_init((void *)WDOG_BASE_ADDR, sizeof(WDOG_Obj)); myCpu = CPU_init((void *)NULL, sizeof(CPU_Obj)); myFlash = FLASH_init((void *)FLASH_BASE_ADDR, sizeof(FLASH_Obj)); myGpio = GPIO_init((void *)GPIO_BASE_ADDR, sizeof(GPIO_Obj)); myPie = PIE_init((void *)PIE_BASE_ADDR, sizeof(PIE_Obj)); mySci = SCI_init((void *)SCIA_BASE_ADDR, sizeof(SCI_Obj)); myAdc = ADC_init((void *)ADC_BASE_ADDR, sizeof(ADC_Obj)); PWMA = PWM_init((void *)PWM_ePWM1_BASE_ADDR, sizeof(PWM_Obj)); PWMB = PWM_init((void *)PWM_ePWM2_BASE_ADDR, sizeof(PWM_Obj)); PWMC = PWM_init((void *)PWM_ePWM3_BASE_ADDR, sizeof(PWM_Obj)); myTimer0 = TIMER_init((void *)TIMER0_BASE_ADDR, sizeof(TIMER_Obj)); } //System Initialization void init_system() { //Disable watchcdog WDOG_disable(myWDog); //Device calibration for the adc (*Device_cal)(); //Sets the internal oscillator source CLK_setOscSrc(myClk, CLK_OscSrc_Internal); // Setup the PLL for x10 /2 which will yield 60Mhz = 10Mhz * 12 / 2 PLL_setup(myPll, PLL_Multiplier_12, PLL_DivideSelect_ClkIn_by_2); //Disable the PIE peripheral and all the interupts PIE_disable(myPie); PIE_disableAllInts(myPie); CPU_disableGlobalInts(myCpu); CPU_clearIntFlags(myCpu); #ifdef _FLASH memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize); #endif } //GPIO initialization void gpio_init() { // Initialize GPIO for the EPWM1A and EPWM1B GPIO_setPullUp(myGpio, GPIO_Number_0, GPIO_PullUp_Disable); GPIO_setPullUp(myGpio, GPIO_Number_1, GPIO_PullUp_Disable); GPIO_setMode(myGpio, GPIO_Number_0, GPIO_0_Mode_EPWM1A); GPIO_setMode(myGpio, GPIO_Number_1, GPIO_1_Mode_EPWM1B); GPIO_setDirection(myGpio,GPIO_Number_0,GPIO_Direction_Output); GPIO_setDirection(myGpio,GPIO_Number_1,GPIO_Direction_Output); // Initialize GPIO for the EPWM2A and EPWM2B GPIO_setPullUp(myGpio, GPIO_Number_2, GPIO_PullUp_Disable); GPIO_setPullUp(myGpio, GPIO_Number_3, GPIO_PullUp_Disable); GPIO_setMode(myGpio, GPIO_Number_2, GPIO_2_Mode_EPWM2A); GPIO_setMode(myGpio, GPIO_Number_3, GPIO_3_Mode_EPWM2B); GPIO_setDirection(myGpio,GPIO_Number_2,GPIO_Direction_Output); GPIO_setDirection(myGpio,GPIO_Number_3,GPIO_Direction_Output); // Initialize GPIO for the EPWM2A and EPWM2B GPIO_setPullUp(myGpio, GPIO_Number_4, GPIO_PullUp_Disable); GPIO_setPullUp(myGpio, GPIO_Number_5, GPIO_PullUp_Disable); GPIO_setMode(myGpio, GPIO_Number_4, GPIO_4_Mode_EPWM3A); GPIO_setMode(myGpio, GPIO_Number_5, GPIO_5_Mode_EPWM3B); GPIO_setDirection(myGpio,GPIO_Number_4,GPIO_Direction_Output); GPIO_setDirection(myGpio,GPIO_Number_5,GPIO_Direction_Output); } //PWM settings void pwma_init() { // PWMA initialization CLK_enablePwmClock(myClk, PWM_Number_1); //PWMA initialiazation // Setup TBCLK PWM_setCounterMode(PWMA,PWM_CounterMode_UpDown); // Count up-down PWM_setPeriod(PWMA,EPWM1_TIMER_TBPRD); // Set timer period PWM_disableCounterLoad(PWMA); // Disable phase loading PWM_setSyncMode(PWMA,PWM_SyncMode_Disable); PWM_setCount(PWMA, 0x0000); // Clear counter PWM_setClkDiv(PWMA, PWM_ClkDiv_by_1); PWM_setHighSpeedClkDiv(PWMA, PWM_HspClkDiv_by_1); // Clock ratio to SYSCLKOUT // Setup shadowing PWM_setShadowMode_CmpA(PWMA, PWM_ShadowMode_Shadow); PWM_setShadowMode_CmpB(PWMA, PWM_ShadowMode_Shadow); PWM_setLoadMode_CmpA(PWMA, PWM_LoadMode_Zero); PWM_setLoadMode_CmpB(PWMA, PWM_LoadMode_Zero); PWM_setCmpA(PWMA,1000); //Initial duty cycle PWM_setCmpB(PWMA,1000); // Set actions PWM_setActionQual_CntUp_CmpA_PwmA(PWMA, PWM_ActionQual_Set); // Set PWM1A on event A, up count PWM_setActionQual_CntDown_CmpA_PwmA(PWMA, PWM_ActionQual_Clear); // Clear PWM1A on event A, down count PWM_setActionQual_CntUp_CmpB_PwmB(PWMA, PWM_ActionQual_Clear); // Set PWM1B on event B, up count PWM_setActionQual_CntDown_CmpB_PwmB(PWMA, PWM_ActionQual_Set); // Clear PWM1B on event B, down count //Set DeadBand Control PWM_setDeadBandOutputMode(PWMA, PWM_DeadBandOutputMode_EPWMxA_Rising_EPWMxB_Falling); PWM_setDeadBandPolarity(PWMA, PWM_DeadBandPolarity_EPWMxB_Inverted); PWM_setDeadBandInputMode(PWMA, PWM_DeadBandInputMode_EPWMxA_Rising_and_Falling); PWM_setDeadBandRisingEdgeDelay(PWMA, DEADTIME_R); PWM_setDeadBandFallingEdgeDelay(PWMA, DEADTIME_F); //-------------------------------------------------------------------------------------------------------------------- //-------------------------------------------------------------------------------------------------------------------- //PWMB initialization CLK_enablePwmClock(myClk, PWM_Number_2); // Setup TBCLK PWM_setCounterMode(PWMB,PWM_CounterMode_UpDown); // Count up-down PWM_setPeriod(PWMB,EPWM1_TIMER_TBPRD); // Set timer period PWM_enableCounterLoad(PWMB); PWM_setPhaseDir(PWMB,PWM_PhaseDir_CountDown); PWM_setSyncMode(PWMB,PWM_SyncMode_Disable); PWM_setCount(PWMB, 0x0000); // Clear counter PWM_setClkDiv(PWMB, PWM_ClkDiv_by_1); PWM_setHighSpeedClkDiv(PWMB, PWM_HspClkDiv_by_1); // Clock ratio to SYSCLKOUT // Setup shadowing PWM_setShadowMode_CmpA(PWMB, PWM_ShadowMode_Shadow); PWM_setShadowMode_CmpB(PWMB, PWM_ShadowMode_Shadow); PWM_setLoadMode_CmpA(PWMB, PWM_LoadMode_Zero); PWM_setLoadMode_CmpB(PWMB, PWM_LoadMode_Zero); PWM_setCmpA(PWMB,1000); //Initial duty cycle PWM_setCmpB(PWMB,1000); // Set actions PWM_setActionQual_CntUp_CmpA_PwmA(PWMB, PWM_ActionQual_Set); // Set PWM2A on event A, up count PWM_setActionQual_CntDown_CmpA_PwmA(PWMB, PWM_ActionQual_Clear); // Clear PWM2A on event A, down count PWM_setActionQual_CntUp_CmpB_PwmB(PWMB, PWM_ActionQual_Clear); // Set PWM2B on event B, up count PWM_setActionQual_CntDown_CmpB_PwmB(PWMB, PWM_ActionQual_Set); // Clear PWM2B on event B, down count //Set DeadBand Control PWM_setDeadBandOutputMode(PWMB, PWM_DeadBandOutputMode_EPWMxA_Rising_EPWMxB_Falling); PWM_setDeadBandPolarity(PWMB, PWM_DeadBandPolarity_EPWMxB_Inverted); PWM_setDeadBandInputMode(PWMB, PWM_DeadBandInputMode_EPWMxA_Rising_and_Falling); PWM_setDeadBandRisingEdgeDelay(PWMB, DEADTIME_R); PWM_setDeadBandFallingEdgeDelay(PWMB, DEADTIME_F); //--------------------------------------------------------------------------------------------------------------- //--------------------------------------------------------------------------------------------------------------- //PWMC initialization CLK_enablePwmClock(myClk, PWM_Number_3); // Setup TBCLK PWM_setCounterMode(PWMC,PWM_CounterMode_UpDown); // Count up-down PWM_setPeriod(PWMC,EPWM1_TIMER_TBPRD); // Set timer period PWM_enableCounterLoad(PWMC); PWM_setPhaseDir(PWMC,PWM_PhaseDir_CountUp); PWM_setSyncMode(PWMC,PWM_SyncMode_Disable); PWM_setCount(PWMC, 0x0000); // Clear counter PWM_setClkDiv(PWMC, PWM_ClkDiv_by_1); PWM_setHighSpeedClkDiv(PWMC, PWM_HspClkDiv_by_1); // Clock ratio to SYSCLKOUT // Setup shadowing PWM_setShadowMode_CmpA(PWMC, PWM_ShadowMode_Shadow); PWM_setShadowMode_CmpB(PWMC, PWM_ShadowMode_Shadow); PWM_setLoadMode_CmpA(PWMC, PWM_LoadMode_Zero); PWM_setLoadMode_CmpB(PWMC, PWM_LoadMode_Zero); PWM_setCmpA(PWMC,1000); //Initial duty cycle PWM_setCmpB(PWMC,1000); // Set actions PWM_setActionQual_CntUp_CmpA_PwmA(PWMC, PWM_ActionQual_Set); // Set PWM3A on event A, up count PWM_setActionQual_CntDown_CmpA_PwmA(PWMC, PWM_ActionQual_Clear); // Clear PWM3A on event A, down count PWM_setActionQual_CntUp_CmpB_PwmB(PWMC, PWM_ActionQual_Clear); // Set PWM3B on event B, up count PWM_setActionQual_CntDown_CmpB_PwmB(PWMC, PWM_ActionQual_Set); // Clear PWM3B on event B, down count //Set DeadBand Control PWM_setDeadBandOutputMode(PWMC, PWM_DeadBandOutputMode_EPWMxA_Rising_EPWMxB_Falling); PWM_setDeadBandPolarity(PWMC, PWM_DeadBandPolarity_EPWMxB_Inverted); PWM_setDeadBandInputMode(PWMC, PWM_DeadBandInputMode_EPWMxA_Rising_and_Falling); PWM_setDeadBandRisingEdgeDelay(PWMC, DEADTIME_R); PWM_setDeadBandFallingEdgeDelay(PWMC, DEADTIME_F); CLK_enableTbClockSync(myClk); } //PIE settings void pie_init() { PIE_enable(myPie); EALLOW; EDIS; PIE_registerPieIntHandler(myPie, PIE_GroupNumber_1, PIE_SubGroupNumber_7, (intVec_t)&cpu_timer0_isr); EDIS; } //Timer settings void timer0_init() { TIMER_stop(myTimer0); TIMER_setPeriod(myTimer0,TTIMERREG); TIMER_setPreScaler(myTimer0,0); TIMER_reload(myTimer0); TIMER_setEmulationMode(myTimer0, TIMER_EmulationMode_StopAfterNextDecrement); TIMER_enableInt(myTimer0); TIMER_start(myTimer0); } void main() { setup_handles(); init_system(); gpio_init(); pwma_init(); pie_init(); timer0_init(); //Enables the CPU interrupt CPU_enableInt(myCpu, CPU_IntNumber_1); //Enables the interrupt of the Timer0 for the PIE module PIE_enableTimer0Int(myPie); CPU_enableGlobalInts(myCpu); CPU_enableDebugInt(myCpu); //Forever Loop to see the results for(;;) { } } interrupt void cpu_timer0_isr(void) { update_compare(); // Acknowledge this interrupt to receive more interrupts from group 1 PIE_clearInt(myPie, PIE_GroupNumber_1); } void update_compare(void) { PWM_setCmpA(PWMA,_IQsat(_IQ30mpy((sine_table[index]+_IQ30(0.9999))/2,EPWM1_TIMER_TBPRD),EPWM1_TIMER_TBPRD,0)); PWM_setCmpB(PWMA,_IQsat(_IQ30mpy((sine_table[index]+_IQ30(0.9999))/2,EPWM1_TIMER_TBPRD),EPWM1_TIMER_TBPRD,0)); PWM_setCmpA(PWMB,_IQsat(_IQ30mpy((sine_table[index2]+_IQ30(0.9999))/2,EPWM1_TIMER_TBPRD),EPWM1_TIMER_TBPRD,0)); PWM_setCmpB(PWMB,_IQsat(_IQ30mpy((sine_table[index2]+_IQ30(0.9999))/2,EPWM1_TIMER_TBPRD),EPWM1_TIMER_TBPRD,0)); PWM_setCmpA(PWMC,_IQsat(_IQ30mpy((sine_table[index3]+_IQ30(0.9999))/2,EPWM1_TIMER_TBPRD),EPWM1_TIMER_TBPRD,0)); PWM_setCmpB(PWMC,_IQsat(_IQ30mpy((sine_table[index3]+_IQ30(0.9999))/2,EPWM1_TIMER_TBPRD),EPWM1_TIMER_TBPRD,0)); if (index++ >511) index = 0; if (index2++ >511) index2 = 0; if (index3++ >511) index3 = 0; } //--------------------------------------------- |