DSP

EPwm触发ADC采样

2019-07-13 14:42发布

站内文章 / DSP
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#include "DSP2833x_Project.h" #include #include #define DELAY 35.700L // ADC start parameters #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz #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 // Average Zero offset #define BUF_SIZE 2 // Sample buffer size #define OFFSET 0.015609 float adoffset; float adsum; void StartEPwm(); #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 // Global variable for this example float SampleTable[BUF_SIZE]; interrupt void epwm_int(void); Uint16 led=0; Uint16 array_index=0; void main(void) { Uint16 i; InitSysCtrl(); EALLOW; SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK EDIS; InitGpio(); DINT; InitPieCtrl(); IER = 0x0000; IFR = 0x0000; InitPieVectTable(); InitAdc(); EALLOW; PieVectTable.EPWM1_INT=&epwm_int; //指向中断子程序的地址 EDIS; AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=1; //允许EPwm的触发信号启动SEQ1 AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1 ; //SEQ1中断使能 IER|= M_INT3; PieCtrlRegs.PIEIER3.bit.INTx1=1; EINT; ERTM; AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK; // 算出采样频率 AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS; //没有对高速时钟分频 // AdcRegs.ADCTRL1.bit.CPS=0; //ADC初始化中默认为0 AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 级联模式 AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //顺序采样 AdcRegs.ADCTRL1.bit.CONT_RUN=1; //连续运行 AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1; // Enable Sequencer override feature AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x1; AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; for (i=0; iBUF_SIZE) {array_index = 0;} // while (AdcRegs.ADCST.bit.INT_SEQ1== 0){} //当转换完后中断标志位会被置位，这个是判断是否转换完 AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; //清除中断标志位 SampleTable[array_index++]= ( (AdcRegs.ADCRESULT0)>>4)*3.0/4095.0-OFFSET; //计算出模拟量 EPwm1Regs.ETCLR.bit.INT=1; //使中断标志位清除 PieCtrlRegs.PIEACK.bit.ACK3=1; //清除应答标志位 } void configtestledON(void) { EALLOW; SYSRUN_SET = 1; EDIS; } void configtestledOFF(void) { EALLOW; SYSRUN_CLEAR = 1; EDIS; } void delay (Uint16 t) { Uint16 i; while(t--) { for(i=0;i<125;i++) asm(" RPT #3 || NOP"); } } void StartEPwm(void) { InitEPwm1Gpio(); SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; //PWM模块时基时钟同步使能 EPwm1Regs.TBSTS.all=0; EPwm1Regs.TBPHS.half.TBPHS=0; EPwm1Regs.TBCTR=0; EPwm1Regs.CMPCTL.all=0x50; // Immediate mode for CMPA and CMPB EPwm1Regs.CMPA.half.CMPA =SP/2; EPwm1Regs.CMPB=0; EPwm1Regs.AQCTLA.all=0x60; // EPWMxA = 1 when CTR=CMPA and counter inc // EPWMxA = 0 when CTR=CMPA and counter dec 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; //pwm斩波控制寄存器 //EPwmxSOCA触发ADC，利用EPwm的中断触发中断信号 EPwm1Regs.ETSEL.bit.SOCAEN=1; EPwm1Regs.ETSEL.bit.SOCASEL=1; EPwm1Regs.ETSEL.bit.INTEN=1; EPwm1Regs.ETSEL.bit.INTSEL=1; EPwm1Regs.ETPS.bit.SOCAPRD=1; EPwm1Regs.ETPS.bit.INTPRD=1; EPwm1Regs.ETFLG.bit.INT=1; EPwm1Regs.TBCTL.all=0x0010+TBCTLVAL; // Enable Timer EPwm1Regs.TBPRD=SP; EDIS; } void InitEPwm1Gpio(void) { EALLOW; GpioCtrlRegs.GPAPUD.bit.GPIO0=0; GpioCtrlRegs.GPAMUX1.bit.GPIO0=1; EDIS; } //------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------  

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