标准库 stm32定时器触发adc采样

可以使用定时器的中断来触发ADC采样，具体实现可以参考以下代码：

#include "stm32f4xx.h"

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        // 触发ADC采样
        ADC_SoftwareStartConv(ADC1);
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    }
}

int main(void)
{
    // 初始化定时器
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 定时器周期为1ms
    TIM_TimeBaseStructure.TIM_Prescaler = 84 - 1; // 定时器时钟频率为84MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 初始化ADC
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    ADC_InitTypeDef ADC_InitStructure;
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStructure);
    ADC_Cmd(ADC1, ENABLE);

    // 配置定时器中断
    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);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    // 启动定时器
    TIM_Cmd(TIM2, ENABLE);

    while (1)
    {
        // 等待ADC采样完成
        while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
        // 获取ADC采样结果
        uint16_t adc_value = ADC_GetConversionValue(ADC1);
        // 处理采样结果
        // ...
    }
}

这段代码实现了使用定时器2的中断来触发ADC1的采样，每隔1ms触发一次采样。在中断处理函数中，使用`ADC_SoftwareStartConv()`函数触发ADC采样。在主函数中，使用`ADC_GetFlagStatus()`和`ADC_GetConversionValue()`函数获取采样结果。