使用 STM32G431 实现 PWM 控制风扇速度的详细教程

#include "main.h"



// 定义 PWM 占空比变量

uint16_t pwmDutyCycle = 50; // 初始占空比为 50%



void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_TIM1_Init(void);



// TIM1 句柄定义

TIM_HandleTypeDef htim1;



int main(void) {

    HAL_Init();

    SystemClock_Config();

    MX_GPIO_Init();

    MX_TIM1_Init();



    // 启动 TIM1 PWM 输出

    HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);



    while (1) {

        // 模拟调整 PWM 占空比

        for (pwmDutyCycle = 0; pwmDutyCycle <= 100; pwmDutyCycle += 10) {

            __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, pwmDutyCycle);

            HAL_Delay(500); // 每次调整后延迟 500ms

        }

    }

}



static void MX_TIM1_Init(void) {

    TIM_OC_InitTypeDef sConfigOC = {0};

    

    htim1.Instance = TIM1;

    htim1.Init.Prescaler = 80 - 1; // 80 MHz 主频分频到 1 MHz

    htim1.Init.CounterMode = TIM_COUNTERMODE_UP;

    htim1.Init.Period = 100 - 1; // PWM 频率为 10 kHz

    htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

    htim1.Init.RepetitionCounter = 0;

    HAL_TIM_PWM_Init(&htim1);



    sConfigOC.OCMode = TIM_OCMODE_PWM1;

    sConfigOC.Pulse = 50; // 初始占空比为 50%

    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

    HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1);

}



static void MX_GPIO_Init(void) {

    __HAL_RCC_GPIOA_CLK_ENABLE(); // 启用 GPIOA 时钟

    GPIO_InitTypeDef GPIO_InitStruct = {0};

    GPIO_InitStruct.Pin = GPIO_PIN_8; // TIM1_CH1 对应的引脚

    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

    GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}



void SystemClock_Config(void) {

    // 配置时钟，具体配置根据需求调整

    RCC_OscInitTypeDef RCC_OscInitStruct = {0};

    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};



    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;

    RCC_OscInitStruct.HSIState = RCC_HSI_ON;

    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;

    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;

    RCC_OscInitStruct.PLL.PLLM = 1;

    RCC_OscInitStruct.PLL.PLLN = 8;

    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;

    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;

    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;

    HAL_RCC_OscConfig(&RCC_OscInitStruct);



    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK |

                                  RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;

    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;

    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;

    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4);

}