编译平台：IAR5.40
测试概述：使用片内振荡器时钟HSI，双ADC同步采样，ADC1采用DMA1存放，ADC2采用直接读取。
每读取十个采样值计数一次，定时一秒钟，通过串口将采样次数送出，测试ADC采样速率。

一、主频设为：56MHz
使用HSI，STM32F103最高频率可达72MHz，主频在56MHz时AD速率最大。
RCC_PLLConfig(RCC_PLLSource_HSI_Div2,RCC_PLLMul_14);//8 ÷ 2 × 14 = 56MHz

二、ADC工作频率：14MHz
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//56 ÷ 4 = 14MHz

三、TIM2设置1s中断
TIM_TimeBaseStructure.TIM_Period = 2240; // 1s// for 103
TIM_TimeBaseStructure.TIM_Prescaler = 0x00; // for 103
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_PrescalerConfig(TIM2, 25000-1, TIM_PSCReloadMode_Immediate);// for 103
//TIM2CLK = 56 ÷2 = 28MHz
//2240 × 25000 ÷ (28MHz × 2) = 1s

四、DMA设置
只有ADC1和ADC3有DMA功能，而STM32F103只有ADC1和ADC2，所以DMA只设置存放ADC1的数据，ADC2直接读取。
缓存大小设为10个单位数据，每存放10个数据FLAG_TC1置高，通知记录采样次数。
#define ADC1_DR_Address ((uint32_t)ADC1_BASE+0x4C)
#define ADC2_DR_Address ((uint32_t)ADC2_BASE+0x4C)
__IO uint32_t ADC1_ConvertedValueTab[2];
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC1_ConvertedValueTab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 10;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE);

五、ADC设置
双AD同步采样模式，不扫描，连续采样，1个规则通道
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_1Cycles5);
ADC_ITConfig(ADC1, ADC_IT_EOC, DISABLE);
ADC_DMACmd(ADC1, ENABLE);

ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC2, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC2, ADC_Channel_5, 1, ADC_SampleTime_1Cycles5);
ADC_ITConfig(ADC2, ADC_IT_EOC, ENABLE);

六、主程序
while(1)
{
while(ADC_GetFlagStatus(ADC2, ADC_FLAG_EOC)==RESET);
DMA_ClearFlag(DMA1_FLAG_TC1);
dd = (u16)ADC2->DR;
ADC_ClearITPendingBit(ADC2, ADC_IT_EOC);
min_cnt++;
}

七、中断处理
void TIM2_IRQHandler(void)
{
if(TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
{
send_data(min_cnt);//通过串口检查数据
min_cnt = 0;
}
TIM2->SR = 0x00;
}

八、测试结果

结论：STM32F103的AD转换速率可高达1MSPS。双AD可高达2MSPS。
据手册所示，STM32F2的AD速率可达2MSPS，STM32F4的AD速率可高达2.4MSPS。