stm32中 TIM_DeInit(TIM2); TIM_TimeBaseStructure.TIM_Period = (1000-1); TIM_TimeBaseStructure.TIM_Prescaler =(72-1); TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);参数含义

这段代码在STM32的定时器中起什么作用？

这段代码主要是用来初始化STM32的定时器2，并设置定时器2的计数模式为向上计数模式，时钟分频系数为1，时钟分频因子为1，定时器的ARR寄存器的值为999，实现了定时器2每隔1毫秒就会定时溢出。

相关问题

stm32代码_STM32之低成本的环境噪声传感器的使用（内含原理图和代码）

好的，我可以给你一份使用STM32的低成本环境噪声传感器的代码，但是需要先了解一下传感器的原理和接线。

环境噪声传感器通常是通过声音压力传感器来检测环境噪声水平的。当声音传感器接收到声波时，会产生微小的电信号，该信号经过放大和滤波后，可以转换为数字信号，用于检测环境噪声水平。

以下是使用STM32的低成本环境噪声传感器的代码：

首先，需要定义一些变量和引脚：

#include "stm32f10x.h"

#define ADC1_DR_Address    ((uint32_t)0x4001244C)

__IO uint16_t ADCConvertedValue;

GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

void RCC_Configuration(void);
void GPIO_Configuration(void);
void DMA_Configuration(void);
void ADC_Configuration(void);
void TIM_Configuration(void);
void NVIC_Configuration(void);

int main(void)
{
  RCC_Configuration();
  GPIO_Configuration();
  DMA_Configuration();
  ADC_Configuration();
  TIM_Configuration();
  NVIC_Configuration();

  while (1)
  {
  }
}

void RCC_Configuration(void)
{
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void DMA_Configuration(void)
{
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
  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);
  DMA_Cmd(DMA1_Channel1, ENABLE);
}

void ADC_Configuration(void)
{
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_28Cycles5);

  ADC_DMACmd(ADC1, ENABLE);
  ADC_Cmd(ADC1, ENABLE);
  ADC_ResetCalibration(ADC1);
  while (ADC_GetResetCalibrationStatus(ADC1));

  ADC_StartCalibration(ADC1);
  while (ADC_GetCalibrationStatus(ADC1));
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

void TIM_Configuration(void)
{
  TIM_TimeBaseStructure.TIM_Period = 36000 - 1;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
  TIM_Cmd(TIM2, ENABLE);
}

void NVIC_Configuration(void)
{
  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);
}

void DMA1_Channel1_IRQHandler(void)
{
  if (DMA_GetITStatus(DMA1_IT_TC1))
  {
    DMA_ClearITPendingBit(DMA1_IT_TC1);

    printf("%d\n", ADCConvertedValue);
  }
}

以上就是使用STM32的低成本环境噪声传感器的代码，其中包括了引脚定义、ADC配置、DMA配置等，需要根据具体的硬件进行调整。同时，需要注意传感器的接线，一般需要连接到ADC通道上进行采集。

基于stm32f407的云台舵机KEY1控制水平转动、KEY2控制上下转动

以下是一个基于STM32F407的云台舵机控制代码示例，其中使用TIM2和TIM3定时器控制两个舵机的PWM输出，通过读取ADC的值来获取控制信号（这里假设使用PA0和PA1作为ADC输入）：

#include "stm32f4xx.h"

#define PWM_PERIOD 20000 // PWM周期，单位为us
#define PWM_MIN 1000 // PWM最小值，单位为us
#define PWM_MAX 2000 // PWM最大值，单位为us

int main(void)
{
    // 初始化GPIO
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 初始化TIM2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000000 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 初始化TIM3
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000000 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    // 初始化PWM输出
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);
    TIM_Cmd(TIM2, ENABLE);
    TIM_Cmd(TIM3, ENABLE);

    // 初始化ADC
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    ADC_InitTypeDef ADC_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    ADC_DeInit();
    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStructure);
    ADC_Cmd(ADC1, ENABLE);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);

    while (1)
    {
        // 获取ADC的值
        int adc_value1 = ADC_GetConversionValue(ADC1);
        int adc_value2 = ADC_GetConversionValue(ADC1);

        // 将ADC的值映射到PWM输出范围
        int pwm_value1 = (adc_value1 * (PWM_MAX - PWM_MIN) / 4095) + PWM_MIN;
        int pwm_value2 = (adc_value2 * (PWM_MAX - PWM_MIN) / 4095) + PWM_MIN;

        // 将PWM值输出到TIM2和TIM3
        TIM_SetCompare1(TIM2, pwm_value1);
        TIM_SetCompare2(TIM3, pwm_value2);
    }
}

以上代码演示了如何使用STM32F407控制两个云台舵机的水平和上下转动，通过读取ADC的值来获取控制信号，并将信号映射为PWM输出。需要注意的是，这里没有包含舵机的驱动电路，需要根据具体的舵机和电路设计来进行调整。