This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

F28M35的ADC在SOC序列没转换完时,为何就产生了中断?

各位TI的大牛们,请解答一个问题!

     最近在用TIConcerto系列F28M35H52C 做一个模拟信号采集的项目。在ADC方面遇到一些问题。不知是否方便予以解答。前两天在deyisupport上发过帖子,但没人回答,故现在想你求援。

     问题描述:在我的设计中,ADC1/ADC2采用overlap、依次顺序进行转换,各SOC0--SOC15均采用定时器TINT1100us定时去触发,当SOC15转换完毕后去触发ADCINT1(ADC2SOC15触发ADCINT2)ADCINT1/ADCINT2PIE中不允许中断,通过查询中断标记位判断16SOC转换是否完成。在程序中在各步加设GIO10的方式,通过示波器观察各步的执行时间和状态,发现采用查询ADCINT1中断标记位时,从ADC启动(通过TINT1启动)到ADC1 的中断标记置位时的时间间隔只有惊人的0.8us这么短,那可是16SOC的转换啊!根据TISPRUH22FP900到的参数,应该是543ns X 16=8.5us左右,差距是10倍左右!而采用查询ADCCTL1.bit.ADCBSYADCCTL1.bit.ADCBSYCHN方式,测得到SOC15转换完毕的时间大约8us,还算靠谱! 通过设置断点,发现在中断标记为置位时,ADCBSY=1,且ADCBSYCHN=2,说明在SOC1转换完毕时,就触发了中断!但在初始化代码中,明明是设置的SOC15

Adc1Regs.INTSEL1N2.bit.INT1SEL = 15;                         // setup ADC1 EOC15 to trigger ADCINT1

不知是什么原因。

我的问题就是:如何通过查询相关的ADCINT1中断标记位,判断16SOC转换是否完成?

ADCINT1/ADCINT2TINT1均允许中断,但在PIE中却不允许中断,通过查询方式进行判断。

以下是相关的程序代码,请帮忙看看是否有问题!谢谢! 

由于自己设计的硬件还在打样中。所以目前硬件用的还是Concerto F28M35xx controlCARD。软件是在\ti\controlSUITE\device_support\f28m36x\v206修改的。

 EALLOW;

Adc1Regs.ADCCTL1.bit.ADCBGPWD = 1;     // Power ADC1 BG, Bandgap circuit(带隙基准电路上电TRM P911 ADCCTL1
Adc1Regs.ADCCTL1.bit.ADCREFPWD = 1;   // Power reference,Reference buffers circuit power down
Adc1Regs.ADCCTL1.bit.ADCPWDN = 1;       // Power ADC1, ADC power down
Adc1Regs.ADCCTL1.bit.ADCENABLE = 1;    // Enable ADC1
Adc1Regs.ADCCTL1.bit.ADCREFSEL = 0;    // Select interal BG, Internal/external reference select

Adc1Regs.ADCCTL2.bit.ADCNONOVERLAP = 0;             // 0--Enable overlap mode 
Adc1Regs.ADCCTL1.bit.INTPULSEPOS = 1;                   // ADCINT1 trips after AdcResults latch
Adc1Regs.INTSEL1N2.bit.INT1E = 1;                               // Enabled ADCINT1
Adc1Regs.INTSEL1N2.bit.INT1CONT = 0;                       // Disable ADCINT1 Continuous mode
Adc1Regs.INTSEL1N2.bit.INT1SEL = 15;                         // setup ADC1 EOC15 to trigger ADCINT1
Adc1Regs.SOCPRICTL.bit.SOCPRIORITY = 15;             // 15: SOC0-SOC14 are high priority, SOC15 is in round robin mode.

AnalogSysctrlRegs.TRIG1SEL.all     = 2;     // Assigning TINT1 (CPU Timer 1) to ADC TRIGGER 1 of the ADC1 and ADC2 module 

Adc1Regs.ADCSOC0CTL.bit.CHSEL = 0; // set SOC0 channel select to ADC1A0 
Adc1Regs.ADCSOC1CTL.bit.CHSEL = 8; // set SOC1 channel select to ADC1B0
Adc1Regs.ADCSOC2CTL.bit.CHSEL = 4; // set SOC2 channel select to ADC1A4
Adc1Regs.ADCSOC3CTL.bit.CHSEL = 12; // set SOC3 channel select to ADC1B4
Adc1Regs.ADCSOC4CTL.bit.CHSEL = 0; // set SOC4 channel select to ADC1A0
Adc1Regs.ADCSOC5CTL.bit.CHSEL = 8; // set SOC5 channel select to ADC1B0
Adc1Regs.ADCSOC6CTL.bit.CHSEL = 4; // set SOC6 channel select to ADC1A4
Adc1Regs.ADCSOC7CTL.bit.CHSEL = 12; // set SOC7 channel select to ADC1B4
Adc1Regs.ADCSOC8CTL.bit.CHSEL = 0; // set SOC8 channel select to ADC1A0
Adc1Regs.ADCSOC9CTL.bit.CHSEL = 8; // set SOC9 channel select to ADC1B0
Adc1Regs.ADCSOC10CTL.bit.CHSEL = 4; // set SOC10 channel select to ADC1A4
Adc1Regs.ADCSOC11CTL.bit.CHSEL = 12; // set SOC11 channel select to ADC1B4
Adc1Regs.ADCSOC12CTL.bit.CHSEL = 0; // set SOC12 channel select to ADC1A0
Adc1Regs.ADCSOC13CTL.bit.CHSEL = 8; // set SOC13 channel select to ADC1B0
Adc1Regs.ADCSOC14CTL.bit.CHSEL = 4; // set SOC14 channel select to ADC1A4
Adc1Regs.ADCSOC15CTL.bit.CHSEL = 12; // set SOC15 channel select to ADC1B4

Adc1Regs.ADCSOC0CTL.bit.TRIGSEL = 5; // Set SOC0 start trigger to ADC Trigger 1 of the ADC 
Adc1Regs.ADCSOC1CTL.bit.TRIGSEL = 5; // set SOC1 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC2CTL.bit.TRIGSEL = 5; // Set SOC2 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC3CTL.bit.TRIGSEL = 5; // set SOC3 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC4CTL.bit.TRIGSEL = 5; // Set SOC4 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC5CTL.bit.TRIGSEL = 5; // set SOC5 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC6CTL.bit.TRIGSEL = 5; // Set SOC6 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC7CTL.bit.TRIGSEL = 5; // set SOC7 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC8CTL.bit.TRIGSEL = 5; // Set SOC8 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC9CTL.bit.TRIGSEL = 5; // set SOC9 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC10CTL.bit.TRIGSEL = 5; // Set SOC10 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC11CTL.bit.TRIGSEL = 5; // set SOC11 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC12CTL.bit.TRIGSEL = 5; // Set SOC12 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC13CTL.bit.TRIGSEL = 5; // set SOC13 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC14CTL.bit.TRIGSEL = 5; // Set SOC14 start trigger to ADC Trigger 1 of the ADC
Adc1Regs.ADCSOC15CTL.bit.TRIGSEL = 5; // set SOC15 start trigger to ADC Trigger 1 of the ADC

Adc1Regs.ADCSOC0CTL.bit.ACQPS = 6; // set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1) 
Adc1Regs.ADCSOC1CTL.bit.ACQPS = 6; // set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC2CTL.bit.ACQPS = 6; // set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC3CTL.bit.ACQPS = 6; // set SOC3 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC4CTL.bit.ACQPS = 6; // set SOC4 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC5CTL.bit.ACQPS = 6; // set SOC5 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC6CTL.bit.ACQPS = 6; // set SOC6 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC7CTL.bit.ACQPS = 6; // set SOC7 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC8CTL.bit.ACQPS = 6; // set SOC8 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC9CTL.bit.ACQPS = 6; // set SOC9 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC10CTL.bit.ACQPS = 6; // set SOC10 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC11CTL.bit.ACQPS = 6; // set SOC11 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC12CTL.bit.ACQPS = 6; // set SOC12 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC13CTL.bit.ACQPS = 6; // set SOC13 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC14CTL.bit.ACQPS = 6; // set SOC14 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
Adc1Regs.ADCSOC15CTL.bit.ACQPS = 6; // set SOC15 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

EDIS;

while(CpuTimer1Regs.TCR.bit.TIF==0);                   //This flag gets set when the CPU-timer decrements to zero, 100us

CpuTimer1Regs.TCR.bit.TIF = 1;                             // Writing a 1 to this bit clears the flag

POINTPULSE_DAT_REG = 1;                                // GPIO31-- point pulse, point sanmple strat

//while((Adc1Regs.ADCCTL1.bit.ADCBSY !=0) ||(Adc1Regs.ADCCTL1.bit.ADCBSYCHN != 0x0f));

                                                           // 判断BUSY是否空闲,且最后一个通道是否是SOC15

while(Adc1Regs.ADCINTFLG.bit.ADCINT1==0);                     // 等待ADCINT1信号产生(SOC15转换完毕产生)
Adc1Regs.ADCINTFLGCLR.bit.ADCINT1 = 1;                        // 
清除ADCINT1中断信号

POINTPULSE_DAT_REG = 0;                                                // high level width: 16 socs total time(include: Sample time + Conversion Time)

以上问题,希望各位大牛们解答!

  • 程序最后几句话是干什么用的?

    如果把Adc1Regs.SOCPRICTL.bit.SOCPRIORITY = 15;  这句去了是不是就是SOC15直接最后一个转化了,你这个优先级设定有啥意义啊。

  •   谢谢faller_up 的回答!开始时没设置这一句---Adc1Regs.SOCPRICTL.bit.SOCPRIORITY = 15;  就是因为不对,才加上这一句,加上它也不对 。根据手册,这句的意思是设置SOC0-SOC14 为高优先级,SOC15为低优先级,特别要让SOC15最后转换。

       不过我还是按照你的建议。又试了试。通过设置断点观察,在ADCINT1中断发生时,还是ADCBSY=1,且ADCBSYCHN=2,说明还是在SOC1转换完毕时,就触发了中断!与之前是一样一样的!没有变化!

        请各位亲门积极解答!特别要请TI的工程师们费点心!能给与解答。不甚感谢!