它使用STM32控制4通道规则转换ADC和DMA，并实现了模拟看门狗。使用库函数

，实现了以下功能：

1. 初始化ADC和DMA，设置转换规则和采样时间；
2. 启动ADC和DMA，等待转换完成；
3. 在转换完成后，触发DMA传输完成中断，并将转换结果存储在指定的缓冲区中；
4. 定时器中断用于模拟看门狗，定时器溢出时触发中断，并重新启动看门狗计时器。

下面是代码实现：

#include "stm32f10x.h"

#define ADC_NUM_CHANNELS 4
#define ADC_BUF_SIZE 100

__IO uint16_t adc_buf[ADC_NUM_CHANNELS][ADC_BUF_SIZE];

void ADC_DMA_Init(void);
void TIM_Init(void);
void WDG_Init(void);

int main(void) {
    ADC_DMA_Init();
    TIM_Init();
    WDG_Init();

    while (1) {
        // do something
    }
}

void ADC_DMA_Init(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef ADC_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;

    // Enable GPIO clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // Configure ADC input pins
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Enable ADC1 clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    // Configure ADC parameters
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = ADC_NUM_CHANNELS;
    ADC_Init(ADC1, &ADC_InitStructure);

    // Configure ADC channel sampling time
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_239Cycles5);

    // Enable DMA1 clock
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    // Configure DMA parameters
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(ADC1->DR);
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) adc_buf;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = ADC_NUM_CHANNELS * ADC_BUF_SIZE;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    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);

    // Enable DMA1 channel1 interrupt
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // Enable DMA1 channel1 transfer complete interrupt
    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);

    // Enable ADC and DMA
    ADC_Cmd(ADC1, ENABLE);
    DMA_Cmd(DMA1_Channel1, ENABLE);

    // Start ADC conversions
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

void TIM_Init(void) {
    TIM_TimeBaseInitTypeDef TIM_InitStructure;

    // Enable TIM2 clock
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    // Configure TIM2 parameters
    TIM_InitStructure.TIM_Period = 2000;
    TIM_InitStructure.TIM_Prescaler = 7200; // 10 kHz
    TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_InitStructure);

    // Enable TIM2 interrupt
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // Enable TIM2
    TIM_Cmd(TIM2, ENABLE);

    // Enable TIM2 update interrupt
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
}

void WDG_Init(void) {
    IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
    IWDG_SetPrescaler(IWDG_Prescaler_256);
    IWDG_SetReload(0xFFF);
    IWDG_ReloadCounter();
    IWDG_Enable();
}

void DMA1_Channel1_IRQHandler(void) {
    if (DMA_GetITStatus(DMA1_IT_TC1)) {
        // DMA transfer complete
        DMA_ClearITPendingBit(DMA1_IT_TC1);
        // do something with adc_buf
    }
}

void TIM2_IRQHandler(void) {
    if (TIM_GetITStatus(TIM2, TIM_IT_Update)) {
        // TIM2 update interrupt
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        IWDG_ReloadCounter();
    }
}