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[STM8] ADC问题

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 楼主| yinxiangh 发表于 2020-12-1 23:30 | 显示全部楼层 |阅读模式
ADC, SAR, USART, ADC1, BLE
STM8L151K4T6
在一个STM8L151L的最小系统上，用例程测试了芯片的ADC功能，发现测量的数据不怎么稳定，请问正常吗？
ADC程序：
int main( void )
{
        char buf[64];
        u16 u16_adc1_value;  
        float fVal;

        CLK_PeripheralClockConfig (CLK_Peripheral_USART1,ENABLE);                                        //开启ADC/USART时钟
        CLK_PeripheralClockConfig (CLK_Peripheral_ADC1,ENABLE);                                                //开启ADC/USART时钟
        USART_Init(USART1,9600,USART_WordLength_8b,USART_StopBits_1,USART_Parity_No,USART_Mode_Tx);//USART初始化，9600，8N1
        USART_Cmd (USART1,ENABLE);                                                                                                        //使能USART

        /* Enable ADC clock */
        CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, ENABLE);

        /* de-initialize ADC */
        ADC_DeInit(ADC1);

        /*ADC configuration
        ADC configured as follow:
        - Channel VREF
        - Mode = Single ConversionMode(ContinuousConvMode disabled)
        - Resolution = 12Bit
        - Prescaler = /1
        - sampling time 384 */

        ADC_VrefintCmd(ENABLE);
        delay_10us(3);


        ADC_Cmd(ADC1, ENABLE);         
        ADC_Init(ADC1, ADC_ConversionMode_Single,
        ADC_Resolution_12Bit, ADC_Prescaler_1);

        ADC_SamplingTimeConfig(ADC1, ADC_Group_FastChannels, ADC_SamplingTime_384Cycles);
        ADC_ChannelCmd(ADC1, ADC_Channel_Vrefint, ENABLE);
        delay_10us(3);
     
        while(1)
        {
                ADC_SoftwareStartConv (ADC1);//开启软件转换

                while(!ADC_GetFlagStatus (ADC1,ADC_FLAG_EOC));                                                        //等待转换结束
                ADC_ClearFlag (ADC1,ADC_FLAG_EOC);                                                                                //清除对应标志
                u16_adc1_value=ADC_GetConversionValue (ADC1);                                                        //获取转换值

                fVal = 1225;
                fVal *= 4096;
                fVal /= u16_adc1_value;
                        
                sprintf(buf,"VDD = %.1f mV \r\n",fVal);
                USART1_SendStr(buf);
     }
}

测量结果通过串口输出：
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3327.3 mV
VDD = 3320.7 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3309.8 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3325.1 mV
VDD = 3318.5 mV
VDD = 3334.0 mV
VDD = 3345.1 mV
VDD = 3334.0 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3329.5 mV
VDD = 3301.1 mV
VDD = 3336.2 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3336.2 mV
VDD = 3336.2 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3336.2 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3320.7 mV
VDD = 3329.5 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3345.1 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3309.8 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3320.7 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3320.7 mV
VDD = 3318.5 mV
VDD = 3309.8 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3334.0 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3309.8 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3309.8 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3325.1 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3345.1 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3336.2 mV
VDD = 3318.5 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3336.2 mV
VDD = 3320.7 mV
VDD = 3309.8 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3320.7 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3301.1 mV
VDD = 3320.7 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3320.7 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3309.8 mV
VDD = 3320.7 mV
VDD = 3320.7 mV
VDD = 3309.8 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3345.1 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3327.3 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3336.2 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3318.5 mV
VDD = 3334.0 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3345.1 mV
VDD = 3318.5 mV
VDD = 3336.2 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3336.2 mV
VDD = 3327.3 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3320.7 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3336.2 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3345.1 mV
VDD = 3318.5 mV
VDD = 3327.3 mV
VDD = 3320.7 mV
VDD = 3336.2 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3336.2 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3345.1 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3340.6 mV
VDD = 3336.2 mV
VDD = 3301.1 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3334.0 mV
VDD = 3340.6 mV
VDD = 3320.7 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3318.5 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3320.7 mV
VDD = 3320.7 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3320.7 mV
VDD = 3320.7 mV
VDD = 3318.5 mV
VDD = 3318.5 mV
VDD = 3334.0 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3336.2 mV
VDD = 3338.4 mV
VDD = 3334.0 mV
VDD = 3309.8 mV
VDD = 3318.5 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3334.0 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3338.4 mV
VDD = 3340.6 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3325.1 mV
VDD = 3309.8 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3309.8 mV
VDD = 3340.6 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3320.7 mV
VDD = 3301.1 mV
VDD = 3301.1 mV
VDD = 3329.5 mV
VDD = 3340.6 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3301.1 mV
VDD = 3340.6 mV
VDD = 3320.7 mV
VDD = 3329.5 mV
VDD = 3334.0 mV
VDD = 3338.4 mV
VDD = 3318.5 mV
VDD = 3329.5 mV
VDD = 3318.5 mV
VDD = 3338.4 mV
VDD = 3329.5 mV
VDD = 3329.5 mV
VDD = 3338.4 mV
VDD = 3301.1 mV
......
请问正常吗？
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wyjie 发表于 2020-12-1 23:34 | 显示全部楼层
用万用表监视VDD电压?
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 楼主| yinxiangh 发表于 2020-12-1 23:38 | 显示全部楼层
3325mV，很稳定的
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pangb 发表于 2020-12-1 23:38 | 显示全部楼层
如果有空闲，则运行相应的ALM_IDL(), WRN_IDL(), IDL();
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chenjunt 发表于 2020-12-1 23:45 | 显示全部楼层
万用表是短时间取平均值。你用示波器看
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kangzj 发表于 2020-12-1 23:48 | 显示全部楼层
如果有毛刺就对了，如果有，加一个小电容滤波就可以了
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yufe 发表于 2020-12-1 23:51 | 显示全部楼层
硬件是如何连接的呢
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langgq 发表于 2020-12-1 23:54 | 显示全部楼层
基准电压用的什么
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huanghuac 发表于 2020-12-1 23:57 | 显示全部楼层
直接接地看看采集到的是多少
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yangxiaor520 发表于 2020-12-2 07:53 来自手机 | 显示全部楼层
这个波多很正常
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天意无罪 发表于 2020-12-2 08:33 | 显示全部楼层
在没做滤波处理的情况下，这个ADC的采样波动值算正常的。
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chuxh 发表于 2020-12-2 18:47 | 显示全部楼层
对采样速率进行优化
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pengf 发表于 2020-12-2 18:52 | 显示全部楼层
可能是基准的问题哦
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houcs 发表于 2020-12-2 18:56 | 显示全部楼层
用一个恒压源接上 看看采样的结果是什么
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morrisk 发表于 2020-12-2 19:00 | 显示全部楼层
波动的不是很厉害啊
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 楼主| yinxiangh 发表于 2020-12-2 19:03 | 显示全部楼层

其实还是不大明白，我再琢磨琢磨吧，多谢了哈先
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