STM32F103CB，用AD采样，输入电压到了57mv才能读出数据00000001。57mv以下都是00000000。
用寄存器方式写的程序，
初始化：
ADC1->SR = 0x0000; //初始化
ADC1->CR1 = 0x00000000; //
ADC1->CR2 = 0x00000000; //ADC1 关闭
ADC1->SMPR1 = 0x00000000; //1.5周期
ADC1->SMPR1 |= ADC_SMPR1_SMP10;
ADC1->SMPR2 = 0x00000000; //1.5周期
ADC1->JOFR1 = 0x00000000; //数据偏移
ADC1->JOFR2 = 0x00000000; //数据偏移
ADC1->JOFR3 = 0x00000000; //数据偏移
ADC1->JOFR4 = 0x00000000; //数据偏移
ADC1->HTR = 0x00000000; //高阈值
ADC1->LTR = 0x00000000; //低阈值
ADC1->SQR1 = 0x00000000; //ADC1转换1个通道
ADC1->SQR2 = 0x00000000; //
ADC1->SQR3 = 0x00000000; //ADC1 选择通道，瞬时电流
ADC1->JSQR = 0x00000000; //
ADC1->CR2 |= ADC_CR2_ADON; //打开AD1电源
读AD程序：
ADC1->SR = 0x0000;
ADC1->SQR3 = 0x00000000;
ADC1->SQR3 |= ADC_SQR3_SQ1_1; //ADC1
ADC1->SQR3 |= ADC_SQR3_SQ1_3; //ADC1 第一个转换AN10
Delay(200);
ADC1->CR2 |= ADC_CR2_ADON; //启动A/D 1转换
Delay(200);
while((~ADC1->SR) & ADC_SR_EOC){Delay(1);}
i = ADC1->DR;
AD时钟频率8MHz
Delay(1) 是延迟加清看门狗
输入是电位器中心抽头，用万用表检测的输入电压
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