stm32的扫频代码

请问您需要的是什么类型的扫频代码，是频率扫描吗？如果是的话，以下是一个基于STM32的频率扫描代码示例：

#include "stm32f10x.h"
#include "stdio.h"

#define FREQ_MIN    100000000   //最小扫描频率
#define FREQ_MAX    200000000   //最大扫描频率
#define FREQ_STEP   1000000     //扫描频率步进值
#define FREQ_SAMPLE 100         //每个频率采样次数

uint32_t gFreq = FREQ_MIN;      //当前扫描频率
uint16_t gSampleCount = 0;      //当前采样次数
uint32_t gAdcValue = 0;         //ADC采样值
uint32_t gAdcSum = 0;           //ADC采样值累加和

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        if (gSampleCount >= FREQ_SAMPLE)
        {
            //当前频率采样完毕，计算平均值
            gAdcValue = gAdcSum / FREQ_SAMPLE;
            gAdcSum = 0;
            gSampleCount = 0;

            //输出采样结果
            printf("Freq: %d Hz, ADC Value: %d\n", gFreq, gAdcValue);

            //更新扫描频率
            gFreq += FREQ_STEP;
            if (gFreq > FREQ_MAX)
            {
                //扫描结束
                printf("Scan finished.\n");
                TIM_Cmd(TIM2, DISABLE);
            }
            else
            {
                //设置新的扫描频率
                TIM_SetAutoreload(TIM2, SystemCoreClock / gFreq - 1);
            }
        }
        else
        {
            //开始采样
            ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        }
    }
}

void ADC1_2_IRQHandler(void)
{
    if (ADC_GetITStatus(ADC1, ADC_IT_EOC) != RESET)
    {
        ADC_ClearITPendingBit(ADC1, ADC_IT_EOC);

        //累加采样值
        gAdcSum += ADC_GetConversionValue(ADC1);
        gSampleCount++;
    }
}

void initADC(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    //使能GPIOA时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    //使能ADC1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    //配置PA0为模拟输入
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //配置ADC1
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    //配置ADC1通道0
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);

    //使能ADC1 DMA功能
    ADC_DMACmd(ADC1, ENABLE);

    //使能ADC1中断
    ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);

    //配置ADC1中断优先级
    NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    //使能ADC1
    ADC_Cmd(ADC1, ENABLE);
}

void initTIM2(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

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

    //配置TIM2
    TIM_TimeBaseStructure.TIM_Period = SystemCoreClock / FREQ_MIN - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    //使能TIM2更新中断
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    //配置TIM2中断优先级
    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);
}

int main(void)
{
    //初始化ADC
    initADC();

    //初始化TIM2
    initTIM2();

    //启动TIM2
    TIM_Cmd(TIM2, ENABLE);

    while (1)
    {
    }
}

该代码使用STM32的TIM2定时器和ADC模块实现了一个简单的频率扫描功能。具体来说，代码会从最小扫描频率开始，每次增加一个固定的步进值，直到达到最大扫描频率为止。在每个扫描频率下，代码会进行一定次数的ADC采样，并输出采样结果。您可以根据实际需求修改代码中的扫描范围、步进值和采样次数等参数。