帮忙写一个基于STM32的ADC采样滤波程序

好的，以下是一个基于STM32的ADC采样滤波程序的示例代码：

#include "stm32f4xx.h"

#define SAMPLES 1000
#define FILTER_ORDER 10

uint16_t samples[SAMPLES];
float filtered_samples[SAMPLES];
float filter_coeffs[FILTER_ORDER] = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1};

void init_adc(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_InitTypeDef ADC_InitStruct;
    ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStruct.ADC_ScanConvMode = DISABLE;
    ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStruct.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStruct);

    ADC_Cmd(ADC1, ENABLE);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
}

void init_timer(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseInitTypeDef TIM_InitStruct;
    TIM_InitStruct.TIM_Prescaler = 0;
    TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_InitStruct.TIM_Period = 8399;
    TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM2, &TIM_InitStruct);

    TIM_Cmd(TIM2, ENABLE);
}

void init_dma(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

    DMA_InitTypeDef DMA_InitStruct;
    DMA_InitStruct.DMA_Channel = DMA_Channel_0;
    DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)samples;
    DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStruct.DMA_BufferSize = SAMPLES;
    DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStruct.DMA_Priority = DMA_Priority_High;
    DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream0, &DMA_InitStruct);

    DMA_Cmd(DMA2_Stream0, ENABLE);
}

void init_filter(void)
{
    for (int i = 0; i < SAMPLES; i++) {
        filtered_samples[i] = 0;
    }
}

void filter_samples(void)
{
    for (int i = FILTER_ORDER; i < SAMPLES; i++) {
        float sum = 0;
        for (int j = 0; j < FILTER_ORDER; j++) {
            sum += filter_coeffs[j] * samples[i - j];
        }
        filtered_samples[i] = sum;
    }
}

int main(void)
{
    init_adc();
    init_timer();
    init_dma();
    init_filter();

    while (1) {
        if (DMA_GetFlagStatus(DMA2_Stream0, DMA_FLAG_TCIF0)) {
            DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_TCIF0);
            filter_samples();
        }
    }
}

这个程序使用了STM32的ADC模块来采样外部信号，并使用DMA来将采样数据传输到内存中。然后，程序使用一个简单的移动平均滤波器来对采样数据进行滤波，最终输出滤波后的数据。