帮我写一段STM32生成pwm的c代码
时间: 2023-08-31 16:22:49 浏览: 124
### 回答1:
#include "stm32f10x.h"
void PWM_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* GPIOA Clock Enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* TIM2 Clock Enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOA Configuration: TIM2 Channel2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 999;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
我可以为您提供一段STM32生成PWM的C代码:
#include "stm32f10x.h"
void PWM_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* GPIOA Clock Enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* TIM2 Clock Enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOA Configuration: TIM2 Channel2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 999;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
### 回答2:
当然可以帮你写一段STM32生成PWM的C代码。下面是一个简单的例子,使用STM32Cube HAL库来生成PWM信号:
首先,确保已经配置好你的STM32开发环境。
在主函数中,首先需要初始化PWM相关的外设,如下所示:
```c
#include "stm32f1xx_hal.h"
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM1_Init(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_TIM1_Init();
while (1)
{
// 在这里编写你的主要代码逻辑
}
}
```
接下来,配置GPIO管脚以输出PWM信号,这里假设使用PA8引脚进行输出:
```c
void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET);
/*Configure GPIO pin : PA8 */
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
```
然后,使用TIM1定时器配置PWM输出:
```c
/* TIM1 init function */
void MX_TIM1_Init(void)
{
TIM_OC_InitTypeDef sConfigOC = {0};
htim1.Instance = TIM1;
htim1.Init.Prescaler = (SystemCoreClock / 10000) - 1;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 9999;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 5000;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);
}
```
上述代码中,我们将TIM1定时器的时钟分频为10000,计数器自动重装载值为9999,从而实现10ms的PWM周期。通过sConfigOC.Pulse的值来控制PWM占空比,初始值为5000,即50%的占空比。你可以通过改变这个值来改变PWM的占空比。
最后,在while循环中你可以编写你自己的逻辑来动态改变PWM的占空比,例如增加或减小sConfigOC.Pulse的值。
以上就是一个简单的STM32生成PWM的C代码。根据你的具体需求,你可以进一步配置其他的参数,如定时器的时钟分频、计数器重装载值、占空比等等。希望对你有所帮助!
### 回答3:
当然可以帮你写一段STM32生成PWM的C代码。以下是一个简单的示例代码,用于生成一个占空比可调的PWM信号:
```c
#include "stm32f4xx.h"
// 初始化PWM的函数
void PWM_Init(int frequency, int dutyCycle) {
// 启用GPIO时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 启用定时器时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// 配置GPIO引脚
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// 将PA5与TIM2通道映射
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_TIM2);
// 初始化定时器
TIM_TimeBaseInitTypeDef TIM_InitStruct;
TIM_InitStruct.TIM_Prescaler = 84 - 1; // 设置预分频器,将定时器时钟分频为1MHz
TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up; // 计数器增加模式
TIM_InitStruct.TIM_Period = 1000 / frequency - 1; // 设置定时器周期,用于控制PWM频率
TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1; // 不用分频
TIM_InitStruct.TIM_RepetitionCounter = 0; // 不使用重复计数
TIM_TimeBaseInit(TIM2, &TIM_InitStruct);
// 初始化PWM输出模式
TIM_OCInitTypeDef TIM_OCInitStruct;
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; // 设置PWM模式
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; // 输出使能
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High; // 输出高电平有效
TIM_OCInitStruct.TIM_Pulse = (1000 / frequency) * dutyCycle / 100 - 1; // 设置PWM占空比
TIM_OC1Init(TIM2, &TIM_OCInitStruct);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable); // PWM载波寄存器预装载使能
// 启动定时器
TIM_Cmd(TIM2, ENABLE);
}
int main(void) {
// 初始化系统时钟等
PWM_Init(1000, 50); // 生成频率为1kHz,占空比为50%的PWM信号
while (1) {
// 循环执行其他任务
}
return 0;
}
```
在该代码中,首先启用了GPIOA和TIM2的时钟源,然后配置了PA5引脚为复用功能,并与TIM2的通道1进行映射。接着,初始化了TIM2定时器的基本参数,包括预分频器、计数模式、周期和时钟分频。随后,设置了TIM2的通道1为PWM输出模式,并指定了占空比。最后,启动了定时器,并在main函数中调用PWM_Init函数生成占空比可调的PWM信号。
需要注意的是,代码中的频率是以Hz为单位,占空比是以百分比为单位。你可以根据自己的需求进行修改。另外,该代码适用于STM32F4系列的芯片和STM32Cube库。如果你使用的是其他型号或不同的开发环境/库,请相应进行修改。
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