【中科昊芯Start_DSC28034PNT湖人开发板试用体验】--学写一个PWM

本文来源电子发烧友社区，作者：yjp， 帖子地址：https://bbs.elecfans.com/jishu_2293868_1_1.html

看手册，如何配置PWM，代码如下
void HRPWM1_config(uint16 period){        /影子寄存器的立即装载/        EPwm1Regs.TBCTL.bit.PRDLD = TB_IMMEDIATE;        /PWM周期值向上计数时为TBCLK+1个TBCLK，period-1表示其周期值与实际周期数相等/        EPwm1Regs.TBPRD = period - 1;/*CC比较寄存器的占空比配置*/
/*HRPWM占空比初始值设置:整数部分*/
EPwm1Regs.CMPA.half.CMPA = period / 2;
/*HRPWM占空比初始值设置常规PWM占空比右移8位，扩展16位精度为24位*/
EPwm1Regs.CMPAM.half.CMPAHR = 1 << 8;
EPwm1Regs.CMPB = period / 2;
​
/*EPWM1的相位无偏移*/
EPwm1Regs.TBPHS.half.TBPHS = 0;
/*TB时基计数初始值从0开始计数*/
EPwm1Regs.TBCTR = 0;
/*仿真模式时,时基计数器自由运行*/
EPwm1Regs.TBCTL.bit.FREE_SOFT = 3;
​
/*时基计数器向上计数*/
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP;
/*禁止装载相位*/
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;
/*不产生同步事件*/
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE;
/*时基计数器高速时钟与低速时钟采用1分频*/
EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;
​
/*在CTR=0时装载影子寄存器的值*/
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
/*CC比较寄存器采用影子寄存器模式*/
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
​
/*在CTR=0时EPWMxA清零*/
EPwm1Regs.AQCTLA.bit.ZRO = AQ_CLEAR;
/*EPWMxA向上计数时当CTR=CMPA时EPWMxA置位*/
EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;
/*当CTR=0时EPWMxB清零*/
EPwm1Regs.AQCTLB.bit.ZRO = AQ_CLEAR;
/*EPWMxB向上计数时当CTR=CMPB时EPWMxB置位*/
EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;
​
/*事件中断配置*/
/*从CTR=0处开始执行事件中断*/
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;
/*ET事件中断INT使能*/
EPwm1Regs.ETSEL.bit.INTEN = 1;
/*ET中断事件次数配置:一中断周期内执行3个事件*/
EPwm1Regs.ETPS.bit.INTPRD = ET_3RD;
​
EALLOW;
/*使能生成,占空比调节*/
EPwm1Regs.HRPCTL.bit.HRPE = 1;
/*相位调节屏蔽*/
EPwm1Regs.HRPCTL.bit.TBPHSHRLOADE = 0;
​
/*MEP校准作用在上升沿，占空比控制模式*/
EPwm1Regs.HRCNFG.all = 0x0;
EPwm1Regs.HRCNFG.bit.EDGMODE = HR_REP;
EPwm1Regs.HRCNFG.bit.CTLMODE = HR_CMP;
​
/*自CTR=0开始装载高频CMPAHR寄存器的值*/
EPwm1Regs.HRCNFG.bit.HRLOAD = HR_CTR_ZERO;
/*使能自动校准延迟功能*/
EPwm1Regs.HRCNFG.bit.AUTOCONV = 1;
​
/*自动延迟校准延迟数设置为1*/
EPwm1Regs.HRMSTEP = 0x00FC;
EDIS;}
再中断服务函数如下/********************** 函数名：EPWM2_ISR(void) 参        数：无 返回值：无 作        用：EPWM2事件中断：产生占空比从1到256变化的常规PWM波形 **********************/void INTERRUPT EPWM2_ISR(void){        for(DutyFine=1;DutyFine<256;DutyFine++)        {                EPwm2Regs.CMPA.half.CMPA=DutyFine;        }EPwm2Regs.ETCLR.bit.INT=1;
PieCtrlRegs.PIEACK.all=PIEACK_GROUP3;}