/* * 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(); //初始化系统控制 InitEPwm1Gpio(); Gpio_Setup(); //子函数，gpio口设置 DINT; //关闭中断 InitPieCtrl(); //初始化中断控制 IER = 0x0000; IFR = 0x0000; InitPieVectTable();//初始化中断矢量表
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，进行ePWM配置，再置1 EDIS;
InitEPwm1Example();
EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; //看上一个注释 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配置为ePWM1A功能 GpioCtrlRegs.GPAMUX1.bit.GPIO1=1; //GPIO1配置为ePWM1B功能 EDIS;}
void InitEPwm1Example(void){ // Setup TBCLK EPwm1Regs.TBPRD = 0x61A8; // 3KHz EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0 EPwm1Regs.TBCTR = 0; // 时基计数器清零 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; //写1对ETFLG[INT]状态标志位清零，从而能进行下一次中断 PieCtrlRegs.PIEACK.all=PIEACK_GROUP3;}
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