ESP32S3使用ADC1过一段时间测量电压偏高 (IDFGH-14303)

[WzxKB]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

V5.3.2

Operating System used.

Linux

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

None

What is the expected behavior?

ESP32S3使用IO7，ADC1，channel5，采集一氧化碳的传感器ADC，实际采集电压应该是几百毫伏

What is the actual behavior?

ESP32S3使用IO7，ADC1，channel5，采集一氧化碳的传感器ADC，使用了ESPNOW，不过连不连接wifi，都会再一段时间后，采集的电压偏高，一开始采集的是200毫伏，过一段时间后采集的电压就稳定变为2伏多，使用万用表测量电压确实如此。断开ADC脚和一氧化碳adc采集脚的连接，发现eso32S3电压采集脚有1伏多的电压

Steps to reproduce.

1、ESP32S3 ADC初始化
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/timers.h"
#include "onboard_sensor.h"
#include "soc/soc_caps.h"
#include "esp_log.h"
#include "hal/adc_types.h"
#include "esp_adc/adc_oneshot.h"
#include "esp_adc/adc_cali.h"
#include "esp_adc/adc_cali_scheme.h"
#include "my_adc.h"
#include "my_sync.h"
#include "my_nvs.h"

const static char *TAG = "my_adc";

static adc_oneshot_unit_handle_t adc1_handle;
static bool do_calibration1_chan0 = false;
static adc_cali_handle_t adc1_cali_chan0_handle = NULL;

#define CM_ONBOARD_ADC1_CHAN ADC_CHANNEL_5
#define CM_ONBOARD_ADC1_ATTEN ADC_ATTEN_DB_12
#define CM_ONBOARD_ADC1_BITWIDTH ADC_BITWIDTH_12

static bool adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle);

/// @brief 初始化ADC模块，包括配置ADC1及其通道，并进行校准初始化
/// @return ESP_OK: 成功; 其他: 错误代码
static esp_err_t mq_adc_init(void)
{
esp_err_t ret = ESP_OK;
//-------------ADC1 Init---------------//
adc_oneshot_unit_init_cfg_t init_config1 = {
.unit_id = ADC_UNIT_1,
.ulp_mode = ADC_ULP_MODE_DISABLE,
};
ret = adc_oneshot_new_unit(&init_config1, &adc1_handle);
if (ret != ESP_OK)
{
return ret;
}

//-------------ADC1 Config---------------//
adc_oneshot_chan_cfg_t config = {
    .bitwidth = CM_ONBOARD_ADC1_BITWIDTH,
    .atten = CM_ONBOARD_ADC1_ATTEN,
};
ret = adc_oneshot_config_channel(adc1_handle, CM_ONBOARD_ADC1_CHAN, &config);
if (ret != ESP_OK)
{
    return ret;
}

//-------------ADC1 Calibration Init---------------//
do_calibration1_chan0 = adc_calibration_init(ADC_UNIT_1, CM_ONBOARD_ADC1_CHAN, CM_ONBOARD_ADC1_ATTEN, &adc1_cali_chan0_handle);

return ESP_OK;

}

/// @brief 从ADC读取值并进行校准
/// @param[out] mq_adc_value 读取的ADC值（校准后为电压值，未校准为原始值）
/// @return ESP_OK: 成功; 其他: 错误代码
esp_err_t mq_read(int *mq_adc_value)
{
int adc_value = 0;
int voltage;
esp_err_t ret = adc_oneshot_read(adc1_handle, CM_ONBOARD_ADC1_CHAN, &adc_value);
if (ret != ESP_OK)
{
*mq_adc_value = 0;
return ret;
}
else
{
if (do_calibration1_chan0)
{
ret = adc_cali_raw_to_voltage(adc1_cali_chan0_handle, adc_value, &voltage);
if (ret != ESP_OK)
{
*mq_adc_value = adc_value;
ESP_LOGW(TAG, "校准系统损坏,未校准ADC数据");
return ESP_OK;
}
else
{
*mq_adc_value = voltage;
return ESP_OK;
}
}
else
{
*mq_adc_value = adc_value;
ESP_LOGW(TAG, "校准系统损坏,未校准ADC数据");
return ESP_OK;
}
}
return ESP_FAIL;
}

/// @brief 初始化ADC校准
/// @param[in] unit ADC单元
/// @param[in] channel ADC通道
/// @param[in] atten ADC衰减
/// @param[out] out_handle ADC校准句柄
/// @return true: 校准成功; false: 校准失败
static bool adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle)
{
adc_cali_handle_t handle = NULL;
esp_err_t ret = ESP_FAIL;
bool calibrated = false;
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
if (!calibrated)
{
ESP_LOGI(TAG, "calibration scheme version is %s", "Curve Fitting");
adc_cali_curve_fitting_config_t cali_config = {
.unit_id = unit,
.chan = channel,
.atten = atten,
.bitwidth = CM_ONBOARD_ADC1_BITWIDTH,
};
ret = adc_cali_create_scheme_curve_fitting(&cali_config, &handle);
if (ret == ESP_OK)
{
calibrated = true;
}
}
#endif

#if ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
if (!calibrated)
{
ESP_LOGI(TAG, "calibration scheme version is %s", "Line Fitting");
adc_cali_line_fitting_config_t cali_config = {
.unit_id = unit,
.atten = atten,
.bitwidth = CM_ONBOARD_ADC1_BITWIDTH,
};
ret = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
if (ret == ESP_OK)
{
calibrated = true;
}
}
#endif

*out_handle = handle;
if (ret == ESP_OK)
{
    ESP_LOGI(TAG, "Calibration Success");
}
else if (ret == ESP_ERR_NOT_SUPPORTED || !calibrated)
{
    ESP_LOGW(TAG, "eFuse not burnt, skip software calibration");
}
else
{
    ESP_LOGE(TAG, "Invalid arg or no memory");
}

return calibrated;

}

/// @brief 初始化MQ（包括ADC）
/// @return ESP_OK: 成功; 其他: 错误代码
esp_err_t mq_init(void)
{
esp_err_t ret = ESP_OK;
ret = mq_adc_init();
if (ret != ESP_OK)
{
return ret;
}
return ret;
}

Build or installation Logs.

无

More Information.

文档上找到的是ADC2和WIFI不能共用，但是这个是ADC1脚，所以很奇怪，在两个板子上都复现了

[wanckl]

@WzxKB Hi,

使用万用表测量电压确实如此。断开ADC脚和一氧化碳adc采集脚的连接，发现eso32S3电压采集脚有1伏多的电压

ADC引脚为浮空输入脚，断开后测该脚没有意义，，可以测一下：

1. 不断开时候该脚是否电压变高
2. 断开后，传感器输出脚电压是否变高

😸

[WzxKB]

@WzxKB Hi,

使用万用表测量电压确实如此。断开ADC脚和一氧化碳adc采集脚的连接，发现eso32S3电压采集脚有1伏多的电压

ADC引脚为浮空输入脚，断开后测该脚没有意义，，可以测一下：

1. 不断开时候该脚是否电压变高
2. 断开后，传感器输出脚电压是否变高

😸
@wanckl Hi,
你好，测量发现，不断开时候，ESP32S3上的ADC测量脚会升高，在开机使用一段时间后（几分钟），电压就会升高到2V多，ADC检测的值也变成2v多，断开后测量一氧化碳传感器脚，一直维持在稳定的200mv左右