产生矩形波。输出 Uo2:矩形波、峰峰值>4Vp-p、上升过激小于 6%、占空比 20±2%~80±2%连续可调、频率 20±0.02KHz;
时间: 2023-05-30 08:01:16 浏览: 103
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stm32输出一路0-100kHz的矩形波信号,占空比1%-70%可调的示例代码
以下是一个简单的示例代码,可以实现输出一路0-100kHz的矩形波信号,占空比为1%-70%可调。
```c
#include "stm32f4xx.h"
#define PWM_FREQ 100000 // PWM输出频率
#define PWM_MAX_DUTY 8400 // PWM最大占空比
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t PrescalerValue = 0;
uint16_t TimerPeriod = 0;
uint16_t Channel2Pulse = 0;
// 使能定时器时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
// 定时器配置
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
// 配置定时器输出比较通道2
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
// 预装载比较值和周期值
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
// 配置定时器中断优先级
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 启动定时器
TIM_Cmd(TIM3, ENABLE);
}
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
}
}
void PWM_SetDutyCycle(uint16_t duty)
{
// 计算比较值
uint16_t channel2pulse = (duty * PWM_MAX_DUTY) / 100;
TIM_SetCompare2(TIM3, channel2pulse);
}
int main(void)
{
// 初始化定时器
TIM_Configuration();
// 设置PWM输出频率
uint16_t PrescalerValue = (uint16_t)(SystemCoreClock / 2 / PWM_FREQ) - 1;
uint16_t TimerPeriod = (uint16_t)(SystemCoreClock / 2 / (PrescalerValue + 1) / PWM_FREQ) - 1;
TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate);
TIM_SetAutoreload(TIM3, TimerPeriod);
// 设置PWM占空比
uint16_t duty = 50; // 初始占空比为50%
PWM_SetDutyCycle(duty);
while (1)
{
// 模拟占空比调节
duty += 10;
if (duty > 70)
{
duty = 10;
}
PWM_SetDutyCycle(duty);
delay_ms(100);
}
}
```
需要注意的是,示例代码中使用了一个自定义的函数`PWM_SetDutyCycle()`来设置PWM占空比。在该函数中,我们根据当前占空比和PWM最大占空比计算出比较值,并通过`TIM_SetCompare2()`函数设置到定时器比较通道2的比较寄存器中,从而实现占空比的调节。另外,为了方便占空比的调节,我们在`main()`函数中使用了一个简单的循环来模拟占空比的变化。
设计产生矩形波 Uo1: f=8kHz~10KHz,占空比调节范围:60%~80%,波形无明显失 真;
As an AI language model, I do not have a personal opinion or emotions. "Null" is a term used in programming and computer science to represent the absence of a value or the absence of data. It can also mean zero or no value.