DSP

F28335 PWM触发ADC采样 代码+注释

2019-07-13 12:25发布

站内文章 / DSP
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程序功能： 1 PWM生成  2 PWM触发3路采样  注：主要是对EPWM模块里的事件触发模块进行配置，然后把这些采样读取 数据的程序写到PWM中断里面去。   #include "DSP2833x_Device.h" // DSP2833x Headerfile Include File #include "DSP2833x_Examples.h" // DSP2833x Examples Include File #define POST_SHIFT 0 // Shift results after the entire sample table is full #define INLINE_SHIFT 1 // Shift results as the data is taken from the results regsiter #define NO_SHIFT 0 // Do not shift the results // ADC start parameters #if (CPU_FRQ_150MHZ) // Default - 150 MHz SYSCLKOUT #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz #endif #if (CPU_FRQ_100MHZ) #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz #endif #define ADC_CKPS 0x0 // ADC module clock = HSPCLK/1 = 25.5MHz/(1) = 25.0 MHz #define ADC_SHCLK 0x1 // S/H width in ADC module periods = 2 ADC cycle #define AVG 1000 // Average sample limit #define ZOFFSET 0x00 #define BUF_SIZE 6 volatile Uint16 SampleTable[BUF_SIZE]; volatile float adc0=0; volatile float adc1=0; volatile float adc2=0; void ChoseCap(void); void EPwmSetup(); void SetCap1Mode(void); void SetCap2Mode(void); Uint32 t1=0,t2=0,t3=0,t4=0,T1=0,T2=0,t5,t6,t7,t8,T3,T4,i,led=0,freq=0,duty=1,T1_temp=1,T2_temp=1; interrupt void ISRCap1(void); interrupt void ISRCap2(void); interrupt void epwm_int(void); void InitCapl(); Uint16 array_index; void main(void) { InitSysCtrl(); EALLOW; SysCtrlRegs.HISPCP.all = ADC_MODCLK; // 系统外设时钟6分频，一般ADC就用6分频 // 这是因为ADC最高只能配置25MHz的频率 // 所以最快转换一次的时间使80ns EDIS; InitXintf16Gpio(); DINT; InitPieCtrl(); IER = 0x0000; IFR = 0x0000; InitPieVectTable(); InitAdc(); //这个初始化程序，必须添加DSP2833x_Adc.C文件 EALLOW; PieVectTable.EPWM1_INT = &epwm_int; EDIS; IER |= M_INT3; //IER |= M_INT14; PieCtrlRegs.PIEIER3.bit.INTx1 = 1; EINT; ERTM; AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK; //ADC采样时间选择 AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS; //ADC内核分频 AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; //级联工作方式 AdcRegs.ADCTRL3.bit.SMODE_SEL= 0; // 顺序采样 AdcRegs.ADCTRL1.bit.CONT_RUN = 1; //连续采样 AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1 ; //完成排序后，排序器指针回到最初状态 AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x2; AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1 ; AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2 ; AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1; //软件启动转换功能 AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 0x1; //允许向CPU发出中断请求 for (i=0; iBUF_SIZE) array_index = 0; while(AdcRegs.ADCST.bit.INT_SEQ1 == 0); //等待ADC的中断位为1 AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; //清楚排序器中断位 SampleTable[array_index++]= ( (AdcRegs.ADCRESULT0)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT1)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT2)>>4); adc0=(float)SampleTable[0] * 3.0 /4096.0; // 转换为我们读取的数据类型 adc1=(float)SampleTable[1] * 3.0 /4096.0; // 数据类型转换另外一篇有说明 adc2=(float)SampleTable[2] * 3.0 /4096.0; PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; EPwm1Regs.ETCLR.bit.INT=1; } #include "DSP2833x_Device.h" // DSP2833x Headerfile Include File #include "DSP2833x_Examples.h" // DSP2833x Examples Include File #if (CPU_FRQ_150MHZ) #define CPU_CLK 150e6 #endif #if (CPU_FRQ_100MHZ) #define CPU_CLK 100e6 #endif #define PWM_CLK 10e3 // If diff freq. desired, change freq here. #define SP CPU_CLK/(2*PWM_CLK) #define TBCTLVAL 0x200E // Up-down cnt, timebase = SYSCLKOUT #define UP_DOWN 2 #define UP 0 #define DOWN 1 #define CDIV_NO 0 #define CDIV_2 1 #define CDIV_4 2 #define CDIV_8 3 #define CDIV_16 4 #define HDIV_NO 0 #define HDIV_2 1 #define HDIV_4 2 #define HDIV_6 3 #define HDIV_8 4 #define HDIV_10 5 #define T_1US 75 #define T_1MS 7500 void EPwmSetup() { InitEPwm1Gpio(); // InitEPwm(); // EPwm1Regs.TBSTS.all=0; EPwm1Regs.TBPHS.half.TBPHS=0; //所有相位清零 EPwm1Regs.TBCTR=0; //时基计数器清零 EPwm1Regs.TBPRD = 75; //TBPRD 65536 EPwm1Regs.CMPA.half.CMPA = 37; EPwm1Regs.CMPB = 30; EPwm1Regs.TBCTL.bit.CTRMODE = UP_DOWN; //增计数 EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; //禁止相位控制 EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; // 采用影子寄存器模式 EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; //关闭同步信号 EPwm1Regs.TBCTL.bit.HSPCLKDIV = HDIV_NO; EPwm1Regs.TBCTL.bit.CLKDIV = CDIV_NO; EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // CTR = 0 epwm A 置1 EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR; // CTR = CMPA epwm A 置0 EPwm1Regs.AQCTLB.bit.CBU = AQ_SET; EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; // EPwm1Regs.AQCTLB.all=0; // EPwm1Regs.AQSFRC.all=0; // EPwm1Regs.AQCSFRC.all=0; EPwm1Regs.DBCTL.all=0xb; // EPWMxB is inverted EPwm1Regs.DBRED=0; EPwm1Regs.DBFED=0; EPwm1Regs.TZSEL.all=0; EPwm1Regs.TZCTL.all=0; EPwm1Regs.TZEINT.all=0; EPwm1Regs.TZFLG.all=0; EPwm1Regs.TZCLR.all=0; EPwm1Regs.TZFRC.all=0; EPwm1Regs.ETSEL.all=0; // Interrupt when TBCTR = 0x0000 EPwm1Regs.ETFLG.all=0; EPwm1Regs.ETCLR.all=0; EPwm1Regs.ETFRC.all=0; EPwm1Regs.PCCTL.all=0; EPwm1Regs.ETSEL.bit.INTEN =1; //打开事件触发中断 EPwm1Regs.ETSEL.bit.INTSEL=1; //一次事件触发 EPwm1Regs.ETSEL.bit.SOCAEN =1; //使能epwmxSOCA信号产生 EPwm1Regs.ETSEL.bit.SOCASEL=4; //向上计数 TBCTR=CMPA产生epwmxSOCA信号 EPwm1Regs.ETSEL.bit.SOCBEN =1; //使能epwmxSOCB信号产生 EPwm1Regs.ETSEL.bit.SOCBSEL=4; //向上计数 TBCTR=CMPB产生epwmxSOCB信号 EPwm1Regs.ETPS.bit.INTPRD =1; //第一个事件时产生SOC信号 EPwm1Regs.ETPS.bit.SOCAPRD=1; EPwm1Regs.ETPS.bit.SOCBPRD=1; EPwm1Regs.ETCLR.bit.INT=1; }  

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