Haawking DSC28027实例程序开发教程—ADC_PWM_INT

2021-7-10 15:40:56 1667

0 本帖最后由阳阳阳阳阳阳阳阳于 2021-8-23 14:48 编辑 /**************************************************************** 编译器：Haawking IDE V0.5.0 D S P：dsc28027勇士板电脑配置：Windows10 专业版; 64 位操作系统仿真器：HX100V2 使用库：无作用：采样多个通道的输入电压，ADC的触发源是PWM1A 版本：V0.0.1 **************************************************************/ 1.HaawkingIDE新建工程 2. 配置ADC模块 /************************************************************** 函数名：void ADC_Init(void) 参数：无返回值：无作用：配置ADC转换通道，7个clock的采样周期，触发源为epwm1的ADCSOCA和ADCSOCB ***************************************************************/ void ADC_Init(void) { InitAdc(); // 先调用ADC默认的配置函数初始化（必须） // Configure ADC EALLOW; // AdcRegs.ADCCTL2.bit.CLKDIV2EN = 0; //ADCclock = CPUclock AdcRegs.ADCCTL1.bit.ADCREFSEL = 0; //REF Int AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch //--> P39 HIKE,EOCx产生来自源选择 AdcRegs.INTSEL3N4.bit.INT3E = 1; //ADCINT3是否使能 AdcRegs.INTSEL3N4.bit.INT3CONT = 0; //Disable ADCINT3 Continuous mode，single conversion mode //HIKE,ADCINTx EOC Source Select, 即哪个 EOCx 触发中断 AdcRegs.INTSEL3N4.bit.INT3SEL = 12; //setup EOC12 to trigger ADCINT3 to fire ////////////////////////////////////////////////////////////////////////////////////////////////////////// //SOC 连续采样，赋值与通道连接如下 AdcRegs.ADCSOC0CTL.bit.CHSEL = 0; //result0 //set SOC0 channel select to ADCINA0 AdcRegs.ADCSOC1CTL.bit.CHSEL = 1; //result1 A1 AdcRegs.ADCSOC2CTL.bit.CHSEL = 2; //result2 A2 AdcRegs.ADCSOC3CTL.bit.CHSEL = 3; //result3 A3 AdcRegs.ADCSOC4CTL.bit.CHSEL = 4; //result4 A4 AdcRegs.ADCSOC5CTL.bit.CHSEL = 6; //result5 A6 AdcRegs.ADCSOC6CTL.bit.CHSEL = 7; //result6 A7 AdcRegs.ADCSOC7CTL.bit.CHSEL = 9; //result7 set SOC7 channel select to ADCINB1 AdcRegs.ADCSOC8CTL.bit.CHSEL = 10; //result8 B2 AdcRegs.ADCSOC9CTL.bit.CHSEL = 11; //result9 B3 AdcRegs.ADCSOC10CTL.bit.CHSEL = 12; //result10 B4 AdcRegs.ADCSOC11CTL.bit.CHSEL = 14; //result11 B6 AdcRegs.ADCSOC12CTL.bit.CHSEL = 15; //result12 B7 //-->HIKE ,AD选择触发源 P34 AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 0x05;//PWM1 进行SOCA AdcRegs.ADCSOC1CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC2CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC3CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC4CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC5CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC6CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC7CTL.bit.TRIGSEL = 0x05;//PWM1 进行SOCB AdcRegs.ADCSOC8CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC9CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC10CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC11CTL.bit.TRIGSEL = 0x05; AdcRegs.ADCSOC12CTL.bit.TRIGSEL = 0x05; //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1) AdcRegs.ADCSOC0CTL.bit.ACQPS = 6; AdcRegs.ADCSOC1CTL.bit.ACQPS = 6; AdcRegs.ADCSOC2CTL.bit.ACQPS = 6; AdcRegs.ADCSOC3CTL.bit.ACQPS = 6; AdcRegs.ADCSOC4CTL.bit.ACQPS = 6; AdcRegs.ADCSOC5CTL.bit.ACQPS = 6; AdcRegs.ADCSOC6CTL.bit.ACQPS = 6; AdcRegs.ADCSOC7CTL.bit.ACQPS = 6; AdcRegs.ADCSOC8CTL.bit.ACQPS = 6; AdcRegs.ADCSOC9CTL.bit.ACQPS = 6; AdcRegs.ADCSOC10CTL.bit.ACQPS = 6; AdcRegs.ADCSOC11CTL.bit.ACQPS = 6; AdcRegs.ADCSOC12CTL.bit.ACQPS = 6; EDIS; } 复制代码* 配置PWM模块： /**************************************************************** 函数名：void pwm1_config(void) 参数：无返回值：无作用：配置pwm1为向上向下模式，配置产生epwm1socA事件， ***************************************************************/ void pwm1_config() { EPwm1Regs.TBPRD = 0x599; //设定pwm的周期是1433个TBclk时钟周期 EPwm1Regs.CMPA.half.CMPA = 0x200; //比较器A为512个TBCLK时钟周期 EPwm1Regs.CMPB = 0x300; //比较器B为768个TBCLK时钟周期 EPwm1Regs.TBCTR = 0x0000; //clear counter EPwm1Regs.TBPHS.half.TBPHS = 0x0000; //相位寄存器清零，是设置翻转计数器的时刻 //EPwm1Regs.AQCTLA.bit.ZRO = 0; //最小值 //EPwm1Regs.AQCTLA.bit.PRD = 0x10; //当时基计数器的值与周期寄存器的值相等时置位 EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR; //向下计数时，时基计数器的值与CMPA寄存器的值相等时清零 EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; //向上计数时，时基计数器的值与CMPA寄存器的值相等时置1 EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; //向下计数时，时基计数器的值与CMPB寄存器的值相等时清零 EPwm1Regs.AQCTLB.bit.CBU = AQ_SET; //向上计数时，时基计数器的值与CMPB寄存器的值相等时置1 EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; //向上向下计数方式 EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; //计数寄存器装载相位寄存器禁止装载 EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; //当计数器的值为0时周期寄存器TBPRD装载影子寄存器的值 EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; //同步信号输出选择，当时基计数器等于0时，ePWMxSYNCO信号输出 EPwm1Regs.TBCTL.bit.SWFSYNC = 0; //软件强制同步脉冲，写0没有效果 EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0; // config int EPwm1Regs.ETSEL.bit.INTSEL = 2; //保留 EPwm1Regs.ETSEL.bit.INTEN = 1; //Disable EPWMx_INT generation EPwm1Regs.ETPS.bit.INTPRD = 1; // first event //config soc EPwm1Regs.ETSEL.bit.SOCASEL = 2; // 当TB计数器等于周期的时候 EPWMxSOCA 脉冲将产生 EPwm1Regs.ETSEL.bit.SOCAEN = 1; // 使能EPWMxSOCA pulse EPwm1Regs.ETPS.bit.SOCAPRD = 1; // first event } 复制代码* PWM中断服务程序： /**************************************************************** 函数名：INTERRUPT epwm1_int_isr() 参数：无返回值：无作用：epwm中断服务程序，在此函数中读取adc采集的电压数据 **************************************************************** INTERRUPT void epwm1_int_isr() { while(AdcRegs.ADCCTL1.bit.ADCBSY == 1) {} adcVal[0] = AdcResult.ADCRESULT0; adcVal[1] = AdcResult.ADCRESULT1; adcVal[2] = AdcResult.ADCRESULT2; adcVal[3] = AdcResult.ADCRESULT3; adcVal[4] = AdcResult.ADCRESULT4; adcVal[5] = AdcResult.ADCRESULT5; adcVal[6] = AdcResult.ADCRESULT6; adcVal[7] = AdcResult.ADCRESULT7; adcVal[8] = AdcResult.ADCRESULT8; adcVal[9] = AdcResult.ADCRESULT9; adcVal[10] = AdcResult.ADCRESULT10; adcVal[11] = AdcResult.ADCRESULT11; adcVal[12] = AdcResult.ADCRESULT12; PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; // Acknowledge interrupt to PIE EPwm1Regs.ETCLR.bit.INT = 1; // Clear INT flag for this timer } 复制代码 3. main函数采样多个通道的输入电压，ADC的触发源是pWM的SOC事件，产生PWM中断，在epwm中断服务程序中读取adc采集的电压数据： int main(void) { InitFlash(); InitSysCtrl(); //pll：内部晶振12MHz -- 10倍频 -- 4分频 = 30MHz DINT; IER_DISABLE(0xffff); //禁能所有中断 IFR_DISABLE(0xffff); //清所有中断标志位 InitPieVectTable(); //This function initializes the PIE vector table to a known state.This function must be executed after boot time. EALLOW; PieCtrlRegs.PIEACK.all = 0xffff; //清除所有中断 PieVectTable.EPWM1_INT = &epwm1_int_isr; PieCtrlRegs.PIEIER3.bit.INTx1 = 1; //使能中断INT3.1(EPWM1_INT) EDIS; IER_ENABLE(M_INT3); //enable interrupt reg pwm1_config(); ADC_Init(); EINT; ERTM; while(1){ // i++; } return 0; } 复制代码 4. 接线：P203的RG分别连接通道1A、2A、3A、4A、6A(P203的EN)、7A、1B、3B、4B、6B、7B 注意：RG不需要接0A（0A与V_REFHI复用)、2B（在板上与3.3v连接） 5. 点击编译、编译完成后点击下载 6. 运行结果：查看ADC采样值，Add Watch Expression：AdcResult.ADCRESULT0~12（计算公式：采样值=((电位器电压值-0.0v)/3.3)*4096）。其中通道0A采样值AdcResult.ADCRESULT0 ≈4096，AdcResult.ADCRESULT8 ≈3729（因为2B接电阻R3再接3.3v）下图为调整电位器输入电压为2.0v时的各通道采样值。 0
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