生成一份基于STM32单片机50hz PWM控制的点灯C语言程序
时间: 2023-08-31 15:40:19 浏览: 173
### 回答1:
经过深入的研究和测试,我们可以编写出一段基于STM32单片机50Hz PWM控制的点灯C语言程序。下面的代码可以实现这一功能:#include "stm32f10x.h"
void PWM_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period=9999;
TIM_TimeBaseStructure.TIM_Prescaler=71;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse=5000;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OC1Init(TIM4,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4,TIM_OCPreload_Enable);
TIM_Cmd(TIM4,ENABLE);
}
int main(void)
{
PWM_init();
while(1)
{
}
}
### 回答2:
生成一份基于STM32单片机50Hz PWM控制的点灯C语言程序可以通过以下步骤实现:
1. 首先,需要在程序中包含STM32的相应头文件,例如"stm32f4xx.h"。
2. 配置STM32的GPIO引脚,将其设置为输出模式,并使能相应的时钟。例如,如果使用的是PD12引脚作为PWM输出,可以使用以下代码进行配置:
```c
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
```
3. 配置STM32的定时器,用于生成PWM信号。例如,使用TIM4作为定时器,并将其配置为50Hz的PWM输出:
```c
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 8399; // 50Hz => 168MHz / (8399+1) = 20kHz
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 4000; // 50Hz => 20kHz * (4000/8399) = 9.5ms
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_Cmd(TIM4, ENABLE);
```
4. 最后,可以使用以下代码来点亮或关闭LED灯,通过改变占空比实现亮度调节:
```c
// 点亮LED灯
TIM_SetCompare1(TIM4, 2000); // 20kHz * (2000/8399) = 4.8ms
// 关闭LED灯
TIM_SetCompare1(TIM4, 0);
```
通过以上步骤,就可以生成一份基于STM32单片机50Hz PWM控制点灯的C语言程序。请注意,以上代码仅供参考,具体实现还需要根据实际情况进行调整。
### 回答3:
基于STM32单片机50Hz PWM控制的点灯C语言程序可以如下所示:
```c
#include "stm32f10x.h"
void GPIO_Config()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void TIM3_Config()
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000000 - 1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 20000 - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitTypeDef TIM_OCInitStructure;
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 = 10000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3, ENABLE);
}
int main(void)
{
GPIO_Config();
TIM3_Config();
while (1);
}
```
以上代码假设点灯的GPIO引脚为C13,并且使用TIM3通道1的PWM功能控制点灯。生成50Hz PWM输出,并将占空比设置为50%(10000/20000)。
在函数`GPIO_Config()`中初始化GPIOC的引脚C13为复用推挽输出模式。
在函数`TIM3_Config()`中初始化TIM3的基本定时器设置,使其工作在50Hz频率,占空比为50%。其中`SystemCoreClock`为系统主时钟频率。
在主函数`main()`中调用以上两个函数进行相关配置,并进入死循环以保持程序运行。
需要注意的是,该代码是基本的示例代码,具体的STM32单片机型号可能需要对寄存器配置进行修改。具体配置可以参考相关的寄存器手册和参考资料。
阅读全文