ADC测量与实际不符

we_4010268564 · 发表于 6 天前

TLSR8253 ，PB5引脚测电池分压，PB6测温度传感分压，电表测量PB6=1.8V，PB5=1.65V，现在手触摸热敏电阻，电表测量PB6=1.65V，PB5=1.65V变化正常，不正常的是，ADC打印相反：

代码调用：

```
int main_idle_loop(void)
{
    blc_sdk_main_loop();
    app_process_power_management();
    adc_power_on_sar_adc(1);
    sleep_us(500);
    //==== NTC PB6 ====
        adc_base_init(NTC_ADC_PIN);
    adc_set_ain_pre_scaler(ADC_PRESCALER_1F4);
        //adc_set_ain_channel_differential_mode(ADC_MISC_CHN, B6P, GND);
    gpio_setup_up_down_resistor(NTC_ADC_PIN, PM_PIN_UP_DOWN_FLOAT); //确保内部上下拉浮空，防任何残留配置漏电
  
    adc_set_tsample_cycle(ADC_MISC_CHN, SAMPLING_CYCLES_12);
    gpio_setup_up_down_resistor(NTC_ADC_PIN, PM_PIN_UP_DOWN_FLOAT);
    sleep_us(200);
        adc_sample_and_get_result();

ntc_adc_val = adc_sample_and_get_result();
        ntc_adc_val = ntc_adc_filter_add(ntc_adc_val);

//==== VBAT PB5 ====
        adc_base_init(VBAT_ADC_PIN);
    adc_set_ain_pre_scaler(ADC_PRESCALER_1F4);
    gpio_setup_up_down_resistor(VBAT_ADC_PIN, PM_PIN_UP_DOWN_FLOAT); //消除100K下拉残留（键盘唤醒逻辑所挂），修复节点被拉低+9.6uA漏电
        //adc_set_ain_channel_differential_mode(ADC_MISC_CHN, B5P, GND);
    sleep_us(200);
        vbat_adc_val = adc_sample_and_get_result();
        vbat_adc_val = vbat_adc_filter_add(vbat_adc_val);
```

[11:50:37.704] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1569 | Temp:25 C, VBAT:3138 mV [11:50:38.206] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1537 | Temp:24 C, VBAT:3074 mV [11:50:38.706] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1523 | Temp:24 C, VBAT:3046 mV [11:50:39.208] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1517 | Temp:24 C, VBAT:3034 mV [11:50:39.710] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1512 | Temp:24 C, VBAT:3024 mV [11:50:40.209] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1510 | Temp:23 C, VBAT:3020 mV [11:50:40.712] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1508 | Temp:23 C, VBAT:3016 mV [11:50:41.213] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1507 | Temp:23 C, VBAT:3014 mV [11:50:41.714] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1504 | Temp:23 C, VBAT:3008 mV [11:50:42.216] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1503 | Temp:23 C, VBAT:3006 mV [11:50:42.716] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1502 | Temp:23 C, VBAT:3004 mV [11:50:43.218] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1501 | Temp:23 C, VBAT:3002 mV [11:50:43.719] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1500 | Temp:23 C, VBAT:3000 mV [11:50:44.221] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1499 | Temp:23 C, VBAT:2998 mV [11:50:44.721] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1498 | Temp:23 C, VBAT:2996 mV [11:50:45.223] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1497 | Temp:23 C, VBAT:2994 mV [11:50:45.724] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1497 | Temp:23 C, VBAT:2994 mV [11:50:46.226] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1496 | Temp:23 C, VBAT:2992 mV [11:50:46.727] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1495 | Temp:23 C, VBAT:2990 mV [11:50:47.228] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1494 | Temp:23 C, VBAT:2988 mV [11:50:47.729] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1494 | Temp:23 C, VBAT:2988 mV [11:50:48.231] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1494 | Temp:23 C, VBAT:2988 mV [11:50:48.732] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1493 | Temp:23 C, VBAT:2986 mV [11:50:49.234] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1493 | Temp:23 C, VBAT:2986 mV [11:50:49.735] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1493 | Temp:23 C, VBAT:2986 mV [11:50:50.236] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1492 | Temp:23 C, VBAT:2984 mV [11:50:50.737] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1491 | Temp:23 C, VBAT:2982 mV [11:50:51.239] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1491 | Temp:23 C, VBAT:2982 mV [11:50:51.739] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1490 | Temp:23 C, VBAT:2980 mV [11:50:52.240] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1491 | Temp:23 C, VBAT:2982 mV [11:50:52.743] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1490 | Temp:23 C, VBAT:2980 mV [11:50:53.244] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1490 | Temp:23 C, VBAT:2980 mV [11:50:53.744] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1490 | Temp:23 C, VBAT:2980 mV [11:50:54.246] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1505 | Temp:23 C, VBAT:3010 mV [11:50:54.747] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1516 | Temp:23 C, VBAT:3032 mV [11:50:55.248] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1522 | Temp:23 C, VBAT:3044 mV [11:50:55.749] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1529 | Temp:23 C, VBAT:3058 mV [11:50:56.251] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1516 | Temp:23 C, VBAT:3032 mV [11:50:56.753] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1508 | Temp:23 C, VBAT:3016 mV [11:50:57.253] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1502 | Temp:23 C, VBAT:3004 mV [11:50:57.754] 收 ←◆[ADC] ntc\_raw:725, vbat\_raw:1499 | Temp:23 C, VBAT:2998 mV [11:50:58.256] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1495 | Temp:23 C, VBAT:2990 mV [11:50:58.758] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1490 | Temp:23 C, VBAT:2980 mV [11:50:59.259] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1488 | Temp:23 C, VBAT:2976 mV [11:50:59.760] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1486 | Temp:23 C, VBAT:2972 mV [11:51:00.261] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1483 | Temp:23 C, VBAT:2966 mV [11:51:00.763] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1482 | Temp:23 C, VBAT:2964 mV [11:51:01.264] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1480 | Temp:23 C, VBAT:2960 mV [11:51:01.764] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1477 | Temp:23 C, VBAT:2954 mV [11:51:02.267] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1474 | Temp:23 C, VBAT:2948 mV [11:51:02.768] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1472 | Temp:23 C, VBAT:2944 mV [11:51:03.269] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1470 | Temp:23 C, VBAT:2940 mV [11:51:03.770] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1469 | Temp:23 C, VBAT:2938 mV [11:51:04.272] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1469 | Temp:23 C, VBAT:2938 mV [11:51:04.773] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1469 | Temp:23 C, VBAT:2938 mV [11:51:05.274] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1468 | Temp:23 C, VBAT:2936 mV [11:51:05.776] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1468 | Temp:23 C, VBAT:2936 mV [11:51:06.276] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1468 | Temp:23 C, VBAT:2936 mV [11:51:06.778] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:23 C, VBAT:2932 mV [11:51:07.279] 收 ←◆[ADC] ntc\_raw:723, vbat\_raw:1465 | Temp:23 C, VBAT:2930 mV [11:51:07.782] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1464 | Temp:22 C, VBAT:2928 mV [11:51:08.282] 收 ←◆[ADC] ntc\_raw:723, vbat\_raw:1463 | Temp:22 C, VBAT:2926 mV [11:51:08.783] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1464 | Temp:22 C, VBAT:2928 mV [11:51:09.285] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1464 | Temp:22 C, VBAT:2928 mV [11:51:09.786] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1464 | Temp:22 C, VBAT:2928 mV [11:51:10.287] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1465 | Temp:22 C, VBAT:2930 mV [11:51:10.788] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1465 | Temp:22 C, VBAT:2930 mV [11:51:11.289] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1465 | Temp:22 C, VBAT:2930 mV [11:51:11.791] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:12.291] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:12.793] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:13.295] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:13.796] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1467 | Temp:22 C, VBAT:2934 mV [11:51:14.297] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:14.798] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1467 | Temp:22 C, VBAT:2934 mV [11:51:15.299] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1467 | Temp:22 C, VBAT:2934 mV [11:51:15.800] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:16.301] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:16.803] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:17.304] 收 ←◆[ADC] ntc\_raw:723, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:17.805] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:18.307] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:18.808] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1467 | Temp:22 C, VBAT:2934 mV [11:51:19.309] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV [11:51:19.811] 收 ←◆[ADC] ntc\_raw:724, vbat\_raw:1466 | Temp:22 C, VBAT:2932 mV如何解释这一现象

TL_LANJIAN · 发表于 5 天前

we_4010268564 · 发表于 5 天前

TL_LANJIAN · 发表于 3 天前

TL_LANJIAN · 发表于 3 天前

we_4010268564 · 发表于 3 天前

是的打印结果有问题，查不出原因：手触碰热敏电阻ADC的结果是PB6固定值724-723相当于不变，温度在降低，总的电压PB5获得的ADC值也在下降1537降到1466![image.png](data/attachment/forum/202610/22/104438cjmfjmwesj2edxlj.png)![image.png](data/attachment/forum/202610/22/104504xlnlvm5nf87la4n2.png)

```
_attribute_no_inline_ void user_init_normal(void)
{........
    adc_init();                                  //时钟/复位/采样率全局初始化（必须最先调用）
    adc_set_gpio_calib_vref(1031);               //实测校准：默认1175对本芯片偏差+14%，1175×1640/1870≈1031
    adc_power_on_sar_adc(1);                     // 打开SAR ADC内核电源

//==== 然后再配置两个ADC引脚（PB6 NTC，PB5 VBAT）====
    adc_base_init(NTC_ADC_PIN);//GPIO 切模拟 + ADC 通道映射
    adc_set_ain_pre_scaler(ADC_PRESCALER_1F4);   // 设置ADC预分频
    sleep_us(200);
    adc_sample_and_get_result();  //丢弃无效采样

adc_base_init(VBAT_ADC_PIN);
        adc_set_ain_pre_scaler(ADC_PRESCALER_1F4); 
    sleep_us(200);
    adc_sample_and_get_result();  //丢弃无效采样

tick_adv_update = clock_time();
}
int main_idle_loop(void)
{
    blc_sdk_main_loop();
    app_process_power_management();
    adc_power_on_sar_adc(1);
    //sleep_us(500);
    //==== NTC PB6 ====
        adc_base_init(NTC_ADC_PIN);
    adc_set_ain_pre_scaler(ADC_PRESCALER_1F4);
        //adc_set_ain_channel_differential_mode(ADC_MISC_CHN, B6P, GND);
    gpio_setup_up_down_resistor(NTC_ADC_PIN, PM_PIN_UP_DOWN_FLOAT); //确保内部上下拉浮空，防任何残留配置漏电
  
    adc_set_tsample_cycle(ADC_MISC_CHN, SAMPLING_CYCLES_12);
    sleep_us(500);
        //adc_sample_and_get_result();

ntc_adc_val = adc_sample_and_get_result();
        ntc_adc_val = ntc_adc_filter_add(ntc_adc_val);

//==== VBAT PB5 ====
        adc_base_init(VBAT_ADC_PIN);
    adc_set_ain_pre_scaler(ADC_PRESCALER_1F4);
    gpio_setup_up_down_resistor(VBAT_ADC_PIN, PM_PIN_UP_DOWN_FLOAT); //消除100K下拉残留（键盘唤醒逻辑所挂），修复节点被拉低+9.6uA漏电
        //adc_set_ain_channel_differential_mode(ADC_MISC_CHN, B5P, GND);
    sleep_us(500);
        vbat_adc_val = adc_sample_and_get_result();
        vbat_adc_val = vbat_adc_filter_add(vbat_adc_val);

u16 vdd_mv = adc_b85_vbat_raw2mv(vbat_adc_val);
    s16 ntc_temp_c = adc_b85_ntc_raw2temp(ntc_adc_val, vbat_adc_val);
    temp_filter = ((TEMP_K -1)* temp_filter + ntc_temp_c) / TEMP_K;

if(clock_time_exceed(tick_adv_update, ADV_UPDATE_INTERVAL_US))
    {
        tick_adv_update = clock_time();
        //厂商数据：DEV_ID(1), temp(s16), vbat(u16)
        tbl_advData[5] = DEV_ID;
        tbl_advData[6] = temp_filter & 0xFF;
        tbl_advData[7] = (temp_filter >> 8) & 0xFF;
        tbl_advData[8] = vdd_mv & 0xFF;
        tbl_advData[9] = (vdd_mv >> 8) & 0xFF;
        blc_ll_setAdvData( tbl_advData, sizeof(tbl_advData) );

ntc_vbat_buf[0] = temp_filter & 0xFF;
                ntc_vbat_buf[1] = (temp_filter >> 8) & 0xFF;
                ntc_vbat_buf[2] = vdd_mv & 0xFF;
                ntc_vbat_buf[3] = (vdd_mv >> 8) & 0xFF;

tlkapi_printf(APP_LOG_EN,
            "[ADC] ntc_raw:%d, vbat_raw:%d | Temp:%d C, VBAT:%d mV\r\n",
            ntc_adc_val, vbat_adc_val, temp_filter, vdd_mv
        );
                printf("Public MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",mac_public[0],mac_public[1],mac_public[2],mac_public[3],mac_public[4],mac_public[5]);
    }
    return 0;
}

```

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