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標題: [轉發]F28335 spwm生成程序 [打印本頁]

作者: fangandy 時間: 2020-5-18 20:30
標題: [轉發]F28335 spwm生成程序
/* * main.c */#include "DSP2833x_Project.h"

void InitEPwm1Example(void);void Gpio_Setup(void);interrupt void epwm1_isr(void);

int N=60;float M=0.8;int i;

float sina[30]={0.0000, 0.1081, 0.2150, 0.3193, 0.4199, 0.5156,             0.6052, 0.6877, 0.7622, 0.8277, 0.8835, 0.9290,             0.9635, 0.9868, 0.9985, 0.9985, 0.9868, 0.9635,             0.9290, 0.8835, 0.8277, 0.7622, 0.6877, 0.6052,             0.5156, 0.4199, 0.3193, 0.2150, 0.1081, 0.0000};

float sinb[30]={0.8660, 0.8069, 0.7383, 0.6610, 0.5760, 0.4843,             0.3868, 0.2849, 0.1796, 0.0722, -0.0361, -0.1439,             -0.2501, -0.3533, -0.4524, -0.5462, -0.6335, -0.7135,             -0.7850, -0.8474, -0.8998, -0.9417, -0.9726, -0.9920,             -0.9998, -0.9959, -0.9803, -0.9533, -0.9150, -0.8660};

int main(void) {       InitSysCtrl();  //初始化系統控制       InitEPwm1Gpio();       Gpio_Setup(); //子函數，gpio口設置       DINT;          //關閉中斷       InitPieCtrl();  //初始化中斷控制       IER = 0x0000;       IFR = 0x0000;       InitPieVectTable();//初始化中斷矢量表

      EALLOW;  // This is needed to write to EALLOW protected registers       PieVectTable.EPWM1_INT = &epwm1_isr;       EDIS;

      EALLOW;       SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;  //先置0，進行ePWM配置，再置1       EDIS;

      InitEPwm1Example();

      EALLOW;       SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;  //看上一個注釋       EDIS;

      i=1;

      IER |= M_INT3;

      // Enable EPWM INTn in the PIE: Group 3 interrupt 1-3       PieCtrlRegs.PIEIER3.bit.INTx1 = 1;

      // Enable global Interrupts and higher priority real-time debug events:       EINT; // Enable Global interrupt INTM       ERTM; // Enable Global realtime interrupt DBGM

      for(;;){          __asm("       NOP");       }

}

void Gpio_Setup(void){ EALLOW; GpioCtrlRegs.GPAMUX1.bit.GPIO0=1; //GPIO0配置為ePWM1A功能 GpioCtrlRegs.GPAMUX1.bit.GPIO1=1; //GPIO1配置為ePWM1B功能 EDIS;}

void InitEPwm1Example(void){    // Setup TBCLK    EPwm1Regs.TBPRD = 0x61A8;                   // 3KHz    EPwm1Regs.TBPHS.half.TBPHS = 0x0000;          // Phase is 0    EPwm1Regs.TBCTR = 0;                         // 時基計數器清零    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;       // Disable phase loading    EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;    // Clock ratio to SYSCLKOUT    EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;

   // Setup shadowing    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;    EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;  // Load on Zero    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

   // Set actions    EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;          // Set PWM1A on event A, up count    EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;          // Clear PWM1A on event A, down count

   EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;          // Set PWM1B on event B, up count    EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;          // Clear PWM1B on event B, down count

   // Interrupt where we will change the Compare Values    EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_PRD;    // Select INT on PRD event    EPwm1Regs.ETSEL.bit.INTEN = 1;                // Enable INT    EPwm1Regs.ETPS.bit.INTPRD = ET_1ST;          // Generate INT on 1ST event

   EPwm1Regs.CMPA.half.CMPA=0x0C35;}

interrupt void epwm1_isr(void){

if ((i>=0)&&(i<N/2)){       EPwm1Regs.CMPA.half.CMPA=EPwm1Regs.TBPRD*((1.0+M*sina[ i])/2.0);       EPwm1Regs.CMPB=EPwm1Regs.TBPRD*((1.0+M*sinb[ i])/2.0); }

if ((i>=N/2)&&(i<N)){       EPwm1Regs.CMPA.half.CMPA=EPwm1Regs.TBPRD*((1.0-M*sina[i-30])/2.0);       EPwm1Regs.CMPB=EPwm1Regs.TBPRD*((1.0-M*sinb[i-30])/2.0); }

i++;

if (i>=N){       i=0; }

EPwm1Regs.ETCLR.bit.INT = 1;       //寫1對ETFLG[INT]狀態標志位清零，從而能進行下一次中斷 PieCtrlRegs.PIEACK.all=PIEACK_GROUP3;}

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