ADC采样不准

xiepenghan

目前情况为：对于ADC0分配了三个通道 ADC1分配了一个通道，其中ADC0的ADC_INPUTCHAN_EXT25和ADC1的ADC_INPUTCHAN_EXT21是不准确(前者偏差0.7v，后者偏差0.4v)，ADC0的ADC_INPUTCHAN_EXT14和ADC_INPUTCHAN_EXT19是准确的
具体配置如下：

const adc_converter_config_t adc_config0={
    .clockDivider=0,
    .startTime=12,
    .sampleTime=16,
    .overrunMode=false,
    .autoOffEnable=false,
    .waitEnable=false,
    .trigger=ADC_TRIGGER_SOFTWARE,
    .align=ADC_ALIGN_RIGHT,
    .resolution=ADC_RESOLUTION_12BIT,
    .dmaWaterMark=0,
    .dmaEnable=false,
    .sequenceConfig={
        .sequenceMode=ADC_CONV_STEP,
        .sequenceIntEnable=true,
        .convIntEnable=false,
        .readyIntEnable=false,
        .ovrunIntEnable=false,
        .sampIntEnable=false,
        .channels={
            ADC_INPUTCHAN_EXT14,
            ADC_INPUTCHAN_EXT19,
            ADC_INPUTCHAN_EXT25,
        },
        .totalChannels=3,
    },
    .adcCompareCnt=0,
};

const adc_converter_config_t adc_config1={
    .clockDivider=0,
    .startTime=12,
    .sampleTime=16,
    .overrunMode=false,
    .autoOffEnable=false,
    .waitEnable=false,
    .trigger=ADC_TRIGGER_SOFTWARE,
    .align=ADC_ALIGN_RIGHT,
    .resolution=ADC_RESOLUTION_12BIT,
    .dmaWaterMark=0,
    .dmaEnable=false,
    .sequenceConfig={
        .sequenceMode=ADC_CONV_STEP,
        .sequenceIntEnable=true,
        .convIntEnable=false,
        .readyIntEnable=false,
        .ovrunIntEnable=false,
        .sampIntEnable=false,
        .channels={
            ADC_INPUTCHAN_EXT21,
        },
        .totalChannels=1,
    },
    .adcCompareCnt=0,
};

/* ADC0通道配置数组 - 单通道独立配置 */
const adc_sequence_config_t adc0_ChnConfigArray[8] = {
    /* 通道0: PTC_16 -> ADC0_S14 -> EXT14 (ON_AD功能) */
    {
        .sequenceIntEnable  = false,
        .convIntEnable      = false,
        .readyIntEnable     = false,
        .ovrunIntEnable     = false,
        .sampIntEnable      = false,
        .sequenceMode       = ADC_CONV_STEP,
        .channels           = { ADC_INPUTCHAN_EXT14 },
        .totalChannels      = 1,
    },
    /* 通道1: PTB_22 -> ADC0_S19 -> EXT19 (ACC_AD功能) */
    {
        .sequenceIntEnable  = false,
        .convIntEnable      = false,
        .readyIntEnable     = false,
        .ovrunIntEnable     = false,
        .sampIntEnable      = false,
        .sequenceMode       = ADC_CONV_STEP,
        .channels           = { ADC_INPUTCHAN_EXT19 },
        .totalChannels      = 1,
    },
    /* 通道2: PTB_9 -> ADC0_S25 -> EXT25 (备用) */
    {
        .sequenceIntEnable  = false,
        .convIntEnable      = false,
        .readyIntEnable     = false,
        .ovrunIntEnable     = false,
        .sampIntEnable      = false,
        .sequenceMode       = ADC_CONV_STEP,
        .channels           = { ADC_INPUTCHAN_EXT25 },
        .totalChannels      = 1,
    },
    // /* 通道3-7: 备用通道 */
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
};

/* ADC1通道配置数组 - 顺序与adc_config1的channels列表保持一致 */
const adc_sequence_config_t adc1_ChnConfigArray[8] = {
    /* 通道0: PTD_27 -> ADC1_S21 -> EXT21 (5V_AD功能) */
    {
        .sequenceIntEnable  = false,
        .convIntEnable      = false,
        .readyIntEnable     = false,
        .ovrunIntEnable     = false,
        .sampIntEnable      = false,
        .sequenceMode       = ADC_CONV_STEP,
        .channels           = { ADC_INPUTCHAN_EXT21 },
        .totalChannels      = 1,
    },
    // /* 通道1-4: 原INPUT1~4通道，已停用 */
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // /* 通道5-7: 备用通道 */
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
    // { .sequenceIntEnable=false, .convIntEnable=false, .readyIntEnable=false, .ovrunIntEnable=false, .sampIntEnable=false, .sequenceMode=ADC_CONV_STEP, .channels={ ADC_INPUTCHAN_EXT0 }, .totalChannels=1 },
};

调用情况如下

int16_t HAL_ADC_GetValue(uint32_t instance, uint8_t chn)
{
	uint32_t convtime = 0;
    uint16_t value;
	/* 根据ADC实例选择对应的配置数组 */
	const adc_sequence_config_t *chnConfig;
	if (instance == INST_ADC0) {
		chnConfig = &adc0_ChnConfigArray[chn];
	} else if (instance == INST_ADC1) {
		chnConfig = &adc1_ChnConfigArray[chn];
	} else {
		return -1;  // 无效的ADC实例
	}
	ADC_DRV_ConfigSequence(instance, chnConfig);
	ADC_DRV_Start(instance);
	while(!ADC_DRV_GetEndOfSequenceFlag(instance))
	{
        /* AD值采集超时,避免死循环等待 */
		if (++convtime >= ADC_TIMEOUT) {
            return -1;
		}
	}
    ADC_DRV_ClearEoseqFlagCmd(instance);
    value =  ADC_DRV_ReadFIFO(instance);
    return value;
}

打印出来的FIFO如下图 ADC0和ADC1是准确的 ADC3和ADC4分别有0.7v和0.4v的偏差

李富贵

参考下36页[E600002]YTM32B1HA0_Errata_Sheet_v1.6.pdf

yangke

可以参考这份帖子做一些检查：https://forum.ytmicro.com/topic/444/adc采样漂移或不准问题排查方法?_=1787729289090

YunTu Forum

ADC采样不准

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