<font face="微软雅黑"><font style="font-size:18px">如图里面所示，无论我是在ID端口输入恒定电压，还是直接在A0端口输入，结果寄存器ADCRESULT0的数一直都在波动，波动值大概有100左右，偶尔还会发生突变，变成接近0或者4095，我用的是12位AD模式，用16位的话波动值更大，用示波器检测电源信号，看到电源只有几毫伏的波动，所以一直不知道是哪出问题了，下面是AD的配置程序，还望大神们答疑解惑</font></font><pre style="max-width: 100%;"><code class="cpp hljs" codemark="1"><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">ConfigureADC</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span> </span>{ EALLOW; <span class="hljs-comment">//write configurations</span> AdcaRegs.ADCCTL2.bit.PRESCALE = <span class="hljs-number">6</span>; <span class="hljs-comment">//set ADCCLK divider to /4</span> AdcbRegs.ADCCTL2.bit.PRESCALE = <span class="hljs-number">6</span>; <span class="hljs-comment">//set ADCCLK divider to /4</span> AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE); AdcSetMode(ADC_ADCB, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE); <span class="hljs-comment">//Set pulse positions to late</span> AdcaRegs.ADCCTL1.bit.INTPULSEPOS = <span class="hljs-number">1</span>; AdcbRegs.ADCCTL1.bit.INTPULSEPOS = <span class="hljs-number">1</span>; <span class="hljs-comment">//power up the ADCs</span> AdcaRegs.ADCCTL1.bit.ADCPWDNZ = <span class="hljs-number">1</span>; AdcbRegs.ADCCTL1.bit.ADCPWDNZ = <span class="hljs-number">1</span>; <span class="hljs-comment">//delay for 1ms to allow ADC time to power up</span> DELAY_US(<span class="hljs-number">1000</span>); EDIS; } <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">SetupADC</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span> </span>{ Uint16 acqps; <span class="hljs-comment">//determine minimum acquisition window (in SYSCLKS) based on resolution</span> IF(ADC_RESOLUTION_12BIT == AdcaRegs.ADCCTL2.bit.RESOLUTION){ acqps = <span class="hljs-number">14</span>; <span class="hljs-comment">//75ns</span> } <span class="hljs-keyword">else</span> { <span class="hljs-comment">//resolution is 16-bit</span> acqps = <span class="hljs-number">63</span>; <span class="hljs-comment">//320ns</span> } <span class="hljs-comment">//Select the channels to convert and end of conversion flag</span> <span class="hljs-comment">//ADCA</span> EALLOW; AdcaRegs.ADCSOC0CTL.bit.CHSEL = <span class="hljs-number">0</span>; <span class="hljs-comment">//SOC0 will convert pin A0</span> AdcaRegs.ADCSOC0CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC0CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcaRegs.ADCSOC1CTL.bit.CHSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//SOC1 will convert pin A1</span> AdcaRegs.ADCSOC1CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC1CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcaRegs.ADCSOC2CTL.bit.CHSEL = <span class="hljs-number">2</span>; <span class="hljs-comment">//SOC1 will convert pin A1</span> AdcaRegs.ADCSOC2CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC2CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcaRegs.ADCSOC3CTL.bit.CHSEL = <span class="hljs-number">3</span>; <span class="hljs-comment">//SOC1 will convert pin A1</span> AdcaRegs.ADCSOC3CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC3CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcaRegs.ADCSOC4CTL.bit.CHSEL = <span class="hljs-number">4</span>; <span class="hljs-comment">//SOC1 will convert pin A1</span> AdcaRegs.ADCSOC4CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC4CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcaRegs.ADCSOC5CTL.bit.CHSEL = <span class="hljs-number">5</span>; <span class="hljs-comment">//SOC1 will convert pin A1</span> AdcaRegs.ADCSOC5CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC5CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> <span class="hljs-comment">//ADCB</span> AdcbRegs.ADCSOC0CTL.bit.CHSEL = <span class="hljs-number">0</span>; <span class="hljs-comment">//SOC0 will convert pin B0</span> AdcbRegs.ADCSOC0CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcbRegs.ADCSOC0CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcbRegs.ADCSOC1CTL.bit.CHSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//SOC1 will convert pin B1</span> AdcbRegs.ADCSOC1CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcbRegs.ADCSOC1CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcbRegs.ADCSOC2CTL.bit.CHSEL = <span class="hljs-number">2</span>; <span class="hljs-comment">//SOC1 will convert pin B1</span> AdcbRegs.ADCSOC2CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcbRegs.ADCSOC2CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> AdcbRegs.ADCSOC3CTL.bit.CHSEL = <span class="hljs-number">3</span>; <span class="hljs-comment">//SOC1 will convert pin B1</span> AdcbRegs.ADCSOC3CTL.bit.ACQPS = acqps; <span class="hljs-comment">//sample window is acqps + 1 SYSCLK cycles</span> AdcaRegs.ADCSOC3CTL.bit.TRIGSEL = <span class="hljs-number">1</span>; <span class="hljs-comment">//这里设置1为timer0中断，设置0为软件中断</span> } <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">AdcSetMode</span><span class="hljs-params">(Uint16 adc, Uint16 resolution, Uint16 signalmode)</span> </span>{ Uint16 adcOffsetTrimOTPIndex; <span class="hljs-comment">//index into OTP table of ADC offset trims</span> Uint16 adcOffsetTrim; <span class="hljs-comment">//temporary ADC offset trim</span> <span class="hljs-comment">//re-populate INL trim</span> CalAdcINL(adc); <span class="hljs-keyword">if</span>(<span class="hljs-number">0xFFFF</span> != *((Uint16*)GetAdcOffsetTrimOTP)){ <span class="hljs-comment">//offset trim function is programmed into OTP, so call it</span> <span class="hljs-comment">//calculate the index into OTP table of offset trims and call</span> <span class="hljs-comment">//function to return the correct offset trim</span> adcOffsetTrimOTPIndex = <span class="hljs-number">4</span>*adc + <span class="hljs-number">2</span>*resolution + <span class="hljs-number">1</span>*signalmode; adcOffsetTrim = (*GetAdcOffsetTrimOTP)(adcOffsetTrimOTPIndex); } <span class="hljs-keyword">else</span> { <span class="hljs-comment">//offset trim function is not populated, so set offset trim to 0</span> adcOffsetTrim = <span class="hljs-number">0</span>; } <span class="hljs-comment">//Apply the resolution and signalmode to the specified ADC.</span> <span class="hljs-comment">//Also apply the offset trim and, if needed, linearity trim correction.</span> <span class="hljs-keyword">switch</span>(adc){ <span class="hljs-keyword">case</span> ADC_ADCA: AdcaRegs.ADCCTL2.bit.RESOLUTION = resolution; AdcaRegs.ADCCTL2.bit.SIGNALMODE = signalmode; AdcaRegs.ADCOFFTRIM.all = adcOffsetTrim; <span class="hljs-keyword">if</span>(ADC_RESOLUTION_12BIT == resolution){ <span class="hljs-comment">//12-bit linearity trim workaround</span> AdcaRegs.ADCINLTRIM1 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcaRegs.ADCINLTRIM2 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcaRegs.ADCINLTRIM4 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcaRegs.ADCINLTRIM5 &amp;= <span class="hljs-number">0xFFFF0000</span>; } <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> ADC_ADCB: AdcbRegs.ADCCTL2.bit.RESOLUTION = resolution; AdcbRegs.ADCCTL2.bit.SIGNALMODE = signalmode; AdcbRegs.ADCOFFTRIM.all = adcOffsetTrim; <span class="hljs-keyword">if</span>(ADC_RESOLUTION_12BIT == resolution){ <span class="hljs-comment">//12-bit linearity trim workaround</span> AdcbRegs.ADCINLTRIM1 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcbRegs.ADCINLTRIM2 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcbRegs.ADCINLTRIM4 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcbRegs.ADCINLTRIM5 &amp;= <span class="hljs-number">0xFFFF0000</span>; } <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> ADC_ADCC: AdccRegs.ADCCTL2.bit.RESOLUTION = resolution; AdccRegs.ADCCTL2.bit.SIGNALMODE = signalmode; AdccRegs.ADCOFFTRIM.all = adcOffsetTrim; <span class="hljs-keyword">if</span>(ADC_RESOLUTION_12BIT == resolution){ <span class="hljs-comment">//12-bit linearity trim workaround</span> AdccRegs.ADCINLTRIM1 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdccRegs.ADCINLTRIM2 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdccRegs.ADCINLTRIM4 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdccRegs.ADCINLTRIM5 &amp;= <span class="hljs-number">0xFFFF0000</span>; } <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> ADC_ADCD: AdcdRegs.ADCCTL2.bit.RESOLUTION = resolution; AdcdRegs.ADCCTL2.bit.SIGNALMODE = signalmode; AdcdRegs.ADCOFFTRIM.all = adcOffsetTrim; <span class="hljs-keyword">if</span>(ADC_RESOLUTION_12BIT == resolution){ <span class="hljs-comment">//12-bit linearity trim workaround</span> AdcdRegs.ADCINLTRIM1 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcdRegs.ADCINLTRIM2 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcdRegs.ADCINLTRIM4 &amp;= <span class="hljs-number">0xFFFF0000</span>; AdcdRegs.ADCINLTRIM5 &amp;= <span class="hljs-number">0xFFFF0000</span>; } <span class="hljs-keyword">break</span>; } } <span class="hljs-comment">/* * Loads INL trim values from OTP into the trim registers of the specified ADC. * Use only as part of AdcSetMode function, since linearity trim correction * is needed for some modes. */</span> <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">CalAdcINL</span><span class="hljs-params">(Uint16 adc)</span> </span>{ <span class="hljs-keyword">switch</span>(adc){ <span class="hljs-keyword">case</span> ADC_ADCA: <span class="hljs-keyword">if</span>(<span class="hljs-number">0xFFFF</span> != *((Uint16*)CalAdcaINL)){ <span class="hljs-comment">//trim function is programmed into OTP, so call it</span> (*CalAdcaINL)(); } <span class="hljs-keyword">else</span> { <span class="hljs-comment">//do nothing, no INL trim function populated</span> } <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> ADC_ADCB: <span class="hljs-keyword">if</span>(<span class="hljs-number">0xFFFF</span> != *((Uint16*)CalAdcbINL)){ <span class="hljs-comment">//trim function is programmed into OTP, so call it</span> (*CalAdcbINL)(); } <span class="hljs-keyword">else</span> { <span class="hljs-comment">//do nothing, no INL trim function populated</span> } <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> ADC_ADCC: <span class="hljs-keyword">if</span>(<span class="hljs-number">0xFFFF</span> != *((Uint16*)CalAdccINL)){ <span class="hljs-comment">//trim function is programmed into OTP, so call it</span> (*CalAdccINL)(); } <span class="hljs-keyword">else</span> { <span class="hljs-comment">//do nothing, no INL trim function populated</span> } <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> ADC_ADCD: <span class="hljs-keyword">if</span>(<span class="hljs-number">0xFFFF</span> != *((Uint16*)CalAdcdINL)){ <span class="hljs-comment">//trim function is programmed into OTP, so call it</span> (*CalAdcdINL)(); } <span class="hljs-keyword">else</span> { <span class="hljs-comment">//do nothing, no INL trim function populated</span> } <span class="hljs-keyword">break</span>; } } </code></pre><p> <br> <br> <ignore_js_op> </ignore_js_op></p><dl class="tattl attm"> <dd> <img src="data/attach/1911/yep3g54z1e5xnzzti4gcte6rrx34dmyq.png" alt="微信截图_20190723100314.png" title="微信截图_20190723100314.png"> </dd> </dl> <p><br></p><p></p><p><br></p>