main() {
// Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP2803x_SysCtrl.c file. InitSysCtrl();
// Step 2. Initialize GPIO: // This example function is found in the DSP2803x_Gpio.c file and // illustrates how to set the GPIO to it's default state. // InitGpio(); // Skipped for this example
// Step 3. Clear all interrupts and initialize PIE vector table: // 禁止所有中断 DINT;
// Initialize the PIE control registers to their default state. // The default state is all PIE interrupts disabled and flags // are cleared. // This function is found in the DSP2803x_PieCtrl.c file. InitPieCtrl();//关闭所有PIE中断,清除所有PIE标志
// Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt // Service Routines (ISR). // This will populate the entire table, even if the interrupt // is not used in this example. This is useful for debug purposes. // The shell ISR routines are found in DSP2803x_DefaultIsr.c. // This function is found in DSP2803x_PieVect.c. InitPieVectTable();
// Interrupts that are used in this example are re-mapped to // ISR functions found within this file. EALLOW; // This is needed to write to EALLOW protected register PieVectTable.ADCINT1 = &adc_isr; EDIS; // This is needed to disable write to EALLOW protected registers
// Step 4. Initialize all the Device Peripherals: // This function is found in DSP2803x_InitPeripherals.c // InitPeripherals(); // Not required for this example InitAdc(); // For this example, init the ADC
// Step 5. User specific code, enable interrupts:
// Enable ADCINT1 in PIE PieCtrlRegs.PIEIER1.bit.INTx1 = 1; // Enable INT 1.1 in the PIE IER |= M_INT1; // 打开中断1 EINT; // 允许全球中断 INTM ERTM; //ST1中的DBGM清零允许实时调试
LoopCount = 0; ConversionCount = 0;
// Configure ADC EALLOW; AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch //ADCCTL1:ADC控制寄存器1 //(15)RESET:写1复位ADC模块 //(14)ADCENABLE:ADC模块允许(写0禁止但不断电ADC,写1允许ADC转换) //(13)ADCBSY:为1说明ADC忙 //(12~8)ADCBSYCHN:用来确定ADC当前正在转换的通道 //(7)ADCPWDN:为0时ADC时钟除bandgap&referencce全部断电 //(6)ADCBGPWD:为0:bandgap断电 //(5)ADCREFPWD,为0:Reference buffers断电 //(3)ADCREFSEL:内外部参考选择,为0为内部参考 //(2)INTPULSEPOS:中断何时产生(为0 :ADC开始转换时产生,为1:ADC转换完之前1个时钟周期产生) //(1)VREFLOCONV:为1内部VREFLO连接到ADCINB5 //(0)TEMPCONV:为1内部温度传感器接到ADCINA5 AdcRegs.INTSEL1N2.bit.INT1E = 1; //Enabled ADCINT1 AdcRegs.INTSEL1N2.bit.INT1CONT = 0; //Disable ADCINT1 Continuous mode AdcRegs.INTSEL1N2.bit.INT1SEL = 1; //setup EOC1 to trigger ADCINT1 to fire //INTSELxNy:ADC中断来源选择寄存器 //(14)INTyCONT:中断脉冲产生设置(为0:除非ADCINTy flag清零ADCINTy产生中断;为1:只要有EOC信号就中断) //(13)INTyE:INTy中断允许(为1允许) //(12~8)INTySEL:ADCINTy的EOC信号来源 //(6)INTxCONT:中断脉冲产生设置(为0:除非ADCINTx flag清零ADCINTx产生中断;为1:只要有EOC信号就中断) //(5)INTxE:INTx中断允许(为1允许) //(4~0)INTxSEL:ADCINTx的EOC信号来源 AdcRegs.ADCSOC0CTL.bit.CHSEL = 4; //set SOC0 channel select to ADCINA4 AdcRegs.ADCSOC1CTL.bit.CHSEL = 2; //set SOC1 channel select to ADCINA2 AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 5; //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1 AdcRegs.ADCSOC1CTL.bit.TRIGSEL = 5; //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1 AdcRegs.ADCSOC0CTL.bit.ACQPS = 6; //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1) AdcRegs.ADCSOC1CTL.bit.ACQPS = 6; //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1) //ADCSOCxCTL:ADCSOC0 - SOC15控制寄存器 //(15~11)TRIGSEL:SOC产生来源(软件,CPUtimer中断,PWM,XINT) //(9~6)CHSEL:当SOCx产生的时候ADC转换通道选择(SIMULENx=0时单通道选择,SIMULENx = 1时,两对通道选择) //(5~0)ACQPS:SOCx的采样保持窗口大小。(06h Sample window is 7 cycles long (6 + 1 clock cycles).) EDIS;
// Assumes ePWM1 clock is already enabled in InitSysCtrl(); EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount //ETSEL:事件触发选择寄存器 //(15)SOCBEN:SOCB允许(为1:允许ADC在SOC脉冲来临时转换) //(14~12)SOCBSEL:EPWMxSOCB来源选择(DCBEVT1,TBCTR = 0x0000,TBCTR = TBPRD,equal to CMPA,equal to CMPB) //(11)SOCAEN:SOCA允许(为1:允许ADC在SOC脉冲来临时转换) //(10-8)SOCASEL:EPWMxSOCA来源选择(DCBEVT1,TBCTR = 0x0000,TBCTR = TBPRD,equal to CMPA,equal to CMPB) //(3)INTEN:EPWMx_INT中断产生允许(为1:允许) //(2~0)INTSEL:EPWMx_INT中断来源选择(TBCTR = 0x0000,TBCTR = TBPRD,equal to CMPA,equal to CMPB) EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event //ETPS:时间产生预分频寄存器 //(15~14)SOCBCNT:计数有多少次SOCB事件(一到3次) //(13~12)SOCBPRD:设定多少次SOCB事件产生一个SOCB的脉冲 //(11~10)SOCACNT:计数有多少次SOCA事件(一到3次) //(9~8)SOCAPRD:设定多少次SOCA事件产生一个SOCB的脉冲 //(3~2)INTCNT:计数有多少次EPWMx_INT中断事件(一到3次) //(1~0)INTPRD:设定多少次EPWMx_INT事件产生中断 EPwm1Regs.CMPA.half.CMPA = 0x0080; // Set compare A value EPwm1Regs.TBPRD = 0xFFFF; // Set period for ePWM1 EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start //TBCTL:时间基准控制寄存器 //(15~14)FREE, SOFT:00仿真时立即停止,01完成当前周期时停止,10Free Run //(13)PHSDIR:方向选址寄存器(为1,同步后上升计数,为0,同步后下降计数) //(12~10)CLKDIV:分频寄存器TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)(000 /1,001 /2,010 /4,011 /8,100 /16,101 /32,110 /64,111 /128) //(9~7)HSPCLKDIV:分频寄存器TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)(000 /1,001 /2,010 /4,011 /8,100 /16,101 /32,110 /64,111 /128) //(6)SWFSYNC:软件写1同步(写一同步,仅在SYNCOSEL = 00时有效) //(5~4)SYNCOSEL:同步输出信号产生来源(00 EPWMxSYNC,01 CTR = zero,10 CTR = CMPB ,11 Disable EPWMxSYNCO signal) //(3)PRDLD:周期寄存器何时从shadow读取(为0:TBCTR=0时,为1:不使用shadow即立即读取) //(2)PHSEN:是否允许同步时TBCTR=TBPHS(0不允许,1允许) //(1~0)CTRMODE:计数方向(00上升,01下降,10上升下降,11冻结) // Wait for ADC interrupt for(;;) { LoopCount++; }
}
interrupt void adc_isr(void) {
Voltage1[ConversionCount] = AdcResult.ADCRESULT0; Voltage2[ConversionCount] = AdcResult.ADCRESULT1;
// If 20 conversions have been logged, start over if(ConversionCount == 9) { ConversionCount = 0; } else ConversionCount++;
AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Clear ADCINT1 flag reinitialize for next SOC PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIE
return; }
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