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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TINT1的100us定时去触发，当SOC15转换完毕后去触发ADCINT1(ADC2的SOC15触发ADCINT2)，ADCINT1/ADCINT2在PIE中不允许中断，通过查询中断标记位判断16个SOC转换是否完成。在程序中在各步加设GIO置1或0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16个SOC的转换啊！根据TI的SPRUH22F中P900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.ADCBSY和ADCCTL1.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
Adc1Regs.ADCCTL1.bit.ADCBGPWD = 1; // Power ADC1 BG, Bandgap circuit(带隙基准电路) 上电, 见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
Adc1Regs.SOCPRICTL.bit.SOCPRIORITY = 16也试过了，也不行！连运行状态都不对了！ Adc1Regs.SOCPRICTL.bit.SOCPRIORITY = 16的意思是：All SOCs are in high priority mode, arbitrated by SOC number！而Adc1Regs.SOCPRICTL.bit.SOCPRIORITY = 0的意思是：SOC priority is handled in round robin mode for all channels。按我的理解：=16 和 =0的意义是一样的，是不是！但运行情况不同！
