【MCXA156开发板测评】+A/D数据采集测试
本帖最后由 jinglixixi 于 2025-1-15 22:48 编辑<p>MCXA156具有2路16 bit ADC0与ADC1与一路12 bit DAC，并配有一路运放单元，2路LPCMP及一个温度传感器。</p>
<p>使用ADC0_A2进行数据采集的主程序为：</p>
<pre>
<code class="language-cpp">int main(void)
{
lpadc_config_t mLpadcConfigStruct;
lpadc_conv_trigger_config_t mLpadcTriggerConfigStruct;
lpadc_conv_command_config_t mLpadcCommandConfigStruct;
lpadc_conv_result_t mLpadcResultConfigStruct;
RESET_ReleasePeripheralReset(kADC1_RST_SHIFT_RSTn);
CLOCK_SetClockDiv(kCLOCK_DivADC1, 1u);
CLOCK_AttachClk(kFRO12M_to_ADC1);
BOARD_InitPins();
BOARD_InitBootClocks();
BOARD_InitDebugConsole();
PRINTF("LPADC Polling Example\r\n");
LPADC_GetDefaultConfig(&mLpadcConfigStruct);
mLpadcConfigStruct.enableAnalogPreliminary = true;
#if defined(DEMO_LPADC_VREF_SOURCE)
mLpadcConfigStruct.referenceVoltageSource = DEMO_LPADC_VREF_SOURCE;
#endif /* DEMO_LPADC_VREF_SOURCE */
#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS) && FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
mLpadcConfigStruct.conversionAverageMode = kLPADC_ConversionAverage128;
#endif /* FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS */
LPADC_Init(DEMO_LPADC_BASE, &mLpadcConfigStruct);
#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CALOFSMODE) && FSL_FEATURE_LPADC_HAS_CTRL_CALOFSMODE
LPADC_SetOffsetCalibrationMode(DEMO_LPADC_BASE, DEMO_LPADC_OFFSET_CALIBRATION_MODE);
#endif /* FSL_FEATURE_LPADC_HAS_CTRL_CALOFSMODE */
#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CALOFS) && FSL_FEATURE_LPADC_HAS_CTRL_CALOFS
#if defined(DEMO_LPADC_DO_OFFSET_CALIBRATION) && DEMO_LPADC_DO_OFFSET_CALIBRATION
LPADC_DoOffsetCalibration(DEMO_LPADC_BASE);
#else
#if defined(FSL_FEATURE_LPADC_HAS_OFSTRIM) && FSL_FEATURE_LPADC_HAS_OFSTRIM
#if defined(FSL_FEATURE_LPADC_OFSTRIM_COUNT) && (FSL_FEATURE_LPADC_OFSTRIM_COUNT == 2U)
LPADC_SetOffsetValue(DEMO_LPADC_BASE, DEMO_LPADC_OFFSET_VALUE_A, DEMO_LPADC_OFFSET_VALUE_B);
#elif defined(FSL_FEATURE_LPADC_OFSTRIM_COUNT) && (FSL_FEATURE_LPADC_OFSTRIM_COUNT == 1U)
LPADC_SetOffsetValue(DEMO_LPADC_BASE, DEMO_LPADC_OFFSET_VALUE);
#endif
#else
if (DEMO_LPADC_OFFSET_CALIBRATION_MODE == kLPADC_OffsetCalibration12bitMode)
{
LPADC_SetOffset12BitValue(DEMO_LPADC_BASE, DEMO_LPADC_OFFSET_VALUE_A, DEMO_LPADC_OFFSET_VALUE_B);
}
else
{
LPADC_SetOffset16BitValue(DEMO_LPADC_BASE, DEMO_LPADC_OFFSET_VALUE_A, DEMO_LPADC_OFFSET_VALUE_B);
}
#endif
#endif
#endif
#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_REQ) && FSL_FEATURE_LPADC_HAS_CTRL_CAL_REQ
LPADC_DoAutoCalibration(DEMO_LPADC_BASE);
#endif
#if (defined(FSL_FEATURE_LPADC_HAS_CFG_CALOFS) && FSL_FEATURE_LPADC_HAS_CFG_CALOFS)
LPADC_DoAutoCalibration(DEMO_LPADC_BASE);
#endif
LPADC_GetDefaultConvCommandConfig(&mLpadcCommandConfigStruct);
mLpadcCommandConfigStruct.channelNumber = DEMO_LPADC_USER_CHANNEL;
#if defined(DEMO_LPADC_USE_HIGH_RESOLUTION) && DEMO_LPADC_USE_HIGH_RESOLUTION
mLpadcCommandConfigStruct.conversionResolutionMode = kLPADC_ConversionResolutionHigh;
#endif
LPADC_SetConvCommandConfig(DEMO_LPADC_BASE, DEMO_LPADC_USER_CMDID, &mLpadcCommandConfigStruct);
LPADC_GetDefaultConvTriggerConfig(&mLpadcTriggerConfigStruct);
mLpadcTriggerConfigStruct.targetCommandId = DEMO_LPADC_USER_CMDID;
mLpadcTriggerConfigStruct.enableHardwareTrigger = false;
LPADC_SetConvTriggerConfig(DEMO_LPADC_BASE, 0U, &mLpadcTriggerConfigStruct);
PRINTF("ADC Full Range: %d\r\n", g_LpadcFullRange);
#if defined(FSL_FEATURE_LPADC_HAS_CMDL_CSCALE) && FSL_FEATURE_LPADC_HAS_CMDL_CSCALE
if (kLPADC_SampleFullScale == mLpadcCommandConfigStruct.sampleScaleMode)
{
PRINTF("Full channel scale (Factor of 1).\r\n");
}
else if (kLPADC_SamplePartScale == mLpadcCommandConfigStruct.sampleScaleMode)
{
PRINTF("Divided input voltage signal. (Factor of 30/64).\r\n");
}
#endif
PRINTF("Please press any key to get user channel's ADC value.\r\n");
while (1)
{
GETCHAR();
LPADC_DoSoftwareTrigger(DEMO_LPADC_BASE, 1U);
#if (defined(FSL_FEATURE_LPADC_FIFO_COUNT) && (FSL_FEATURE_LPADC_FIFO_COUNT == 2U))
while (!LPADC_GetConvResult(DEMO_LPADC_BASE, &mLpadcResultConfigStruct, 0U))
#else
while (!LPADC_GetConvResult(DEMO_LPADC_BASE, &mLpadcResultConfigStruct))
#endif
{
}
PRINTF("ADC value: %d\r\n", ((mLpadcResultConfigStruct.convValue) >> g_LpadcResultShift));
}
}
</code></pre>
<p> </p>
<p>经程序的编译与下载，由J8端口的28号引脚可输入相应的模拟信号，其测试结果如图1所示。</p>
<p>在连续采集数据时，需通过串口来方式字符以不断进行。</p>
<p> </p>
<p>图1 数据采集</p>
<p> </p>
<p>在使用内部温度传感器通道的情况下，可进行内部温度的检测，其效果如图2所示。</p>
<p> </p>
<p>图2 内部温度检测</p>
<p> </p>
<p> </p>
<p>图3 ADC 引脚分配</p>
<p> </p>
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