stm32定时器触发adc采样代码

以下是使用STM32定时器触发ADC采样的示例代码：

#include "stm32f4xx.h"

#define ADC3_DR_ADDRESS ((uint32_t)0x4001224C)

void ADC3_Config(void);
void TIM2_Config(void);
void GPIO_Config(void);

int main(void)
{
    GPIO_Config();
    ADC3_Config();
    TIM2_Config();

    while (1)
    {
        // 采样完成后，ADC3_DR寄存器中存储采样值
        uint16_t adc_value = *(uint16_t*)ADC3_DR_ADDRESS;
    }
}

void GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;

    // 使能GPIOC时钟
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

    // 配置PC0为模拟输入
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOC, &GPIO_InitStruct);
}

void ADC3_Config(void)
{
    ADC_CommonInitTypeDef ADC_CommonInitStruct;
    ADC_InitTypeDef ADC_InitStruct;

    // 使能ADC3时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);

    // ADC3通用配置
    ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStruct);

    // ADC3单独配置
    ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStruct.ADC_ScanConvMode = DISABLE;
    ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
    ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
    ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStruct.ADC_NbrOfConversion = 1;
    ADC_Init(ADC3, &ADC_InitStruct);

    // 配置ADC3通道10为采样通道
    ADC_RegularChannelConfig(ADC3, ADC_Channel_10, 1, ADC_SampleTime_480Cycles);

    // 使能ADC3
    ADC_Cmd(ADC3, ENABLE);

    // 等待ADC3启动
    while (!ADC_GetFlagStatus(ADC3, ADC_FLAG_ADONS));
}

void TIM2_Config(void)
{
    TIM_TimeBaseInitTypeDef TIM_InitStruct;

    // 使能TIM2和GPIOA时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    // TIM2配置
    TIM_InitStruct.TIM_Prescaler = 84 - 1;  // 定时器时钟频率为84MHz/84=1MHz
    TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_InitStruct.TIM_Period = 1000 - 1;  // 计数器计数到1000时触发ADC采样
    TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM2, &TIM_InitStruct);

    // 启用TIM2触发ADC3采样
    TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
    ADC_ExternalTrigConvCmd(ADC3, ENABLE);

    // 启动TIM2
    TIM_Cmd(TIM2, ENABLE);
}

此代码初始化了ADC3、TIM2和GPIOC，将PC0配置为模拟输入，并使用TIM2触发ADC3采样。计时器时钟频率为1MHz，计数器计数到1000时触发一次ADC采样。采样完成后，采样值存储在ADC3_DR寄存器中。