DSP28377S - ADC学习编程笔记

//Write ADC configurations and power up the ADC for both ADC A and ADC B
void ConfigureADC(void)
{
EALLOW; //write configurations
AdcaRegs.ADCCTL2.bit.PRESCALE = ; //set ADCCLK divider to /4 //配置ADC时钟，ADC时钟有系统时钟直接提供参考时钟，计算的时候需要注意
AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE); // 设置ADC的采样分辨率为12bit，单输入模式(区别于差分模式) AdcbRegs.ADCCTL2.bit.PRESCALE = ; //set ADCCLK divider to /4
AdcSetMode(ADC_ADCB, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE); //Set pulse positions to late
AdcaRegs.ADCCTL1.bit.INTPULSEPOS = ; //设置ADC的中断产生时机在转换完成后产生中断（Interrupt pulse generation occurs at the end of the conversion）
AdcbRegs.ADCCTL1.bit.INTPULSEPOS = ; //power up the ADC
AdcaRegs.ADCCTL1.bit.ADCPWDNZ = ; //给ADC上电，注意需要延时1ms左右等待上电完成
AdcbRegs.ADCCTL1.bit.ADCPWDNZ = ; //delay for 1ms to allow ADC time to power up
DELAY_US(); EDIS;
}

AdcbRegs.ADCSOC7CTL.bit.CHSEL = ; //SOC0 will convert internal connection B0
AdcbRegs.ADCSOC7CTL.bit.ACQPS = tempsensor_acqps; //sample window is 100 SYSCLK cycles
AdcbRegs.ADCSOC7CTL.bit.TRIGSEL = ; //trigger on ePWM1 SOCA/C，这里根据需要进行配置

AdcaRegs.ADCINTSEL1N2.bit.INT1SEL = ; //end of SOC0 will set INT1 flag (这里一般配置为最后一个优先级的SOC即可！注意要随时修改，这里栽跟头了)（优先级放最后讲解，可以不用理解！）
AdcaRegs.ADCINTSEL1N2.bit.INT1E = ; //enable INT1 flag （如果不配置这里，那么ADC采样完成后中断flag不会置位，所以必须配置为1）
AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = ; //make sure INT1 flag is cleared

//Initialize the temperature sensor
      //Note: The argument needs to change if using a VREFHI voltage other than 3.0V
      InitTempSensor(3.0); （这里已经有现成的封装函数可以使用，直接调用即可！）（如果不初始化，会导致采样无法正常顺序进行，切记切记！）

AdcaRegs.ADCSOC6CTL.bit.CHSEL = ; //SOC0 will convert internal connection A13
AdcaRegs.ADCSOC6CTL.bit.ACQPS = tempsensor_acqps; //sample window is 100 SYSCLK cycles
AdcaRegs.ADCSOC6CTL.bit.TRIGSEL = ; //trigger on ePWM1 SOCA/C

void ConfigureEPWM(void)
{
EALLOW;
// Assumes ePWM clock is already enabled
EPwm1Regs.ETSEL.bit.SOCAEN = ; // Disable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = ; // Select SOC on up-count
EPwm1Regs.ETPS.bit.SOCAPRD = ET_CTR_PRDZERO; // Generate pulse on 1st event（注意这里EPWM可以配置为在ZERO 和 PERIOD时触发ADC采样，这和F28335不一样！又差点栽跟头了！）
EPwm1Regs.CMPA.bit.CMPA = 0x0800; // Set compare A value to 2048 counts
EPwm1Regs.TBPRD = 0x1000; // Set period to 4096 counts
EPwm1Regs.TBCTL.bit.CTRMODE = ; // freeze counter
EDIS;
}