stm32f103c8t6做pwm呼吸灯代码

STM32F103C8T6是一款基于Cortex-M3内核的微控制器，常用于各种嵌入式项目，包括LED灯控制。以下是基本的PWM呼吸灯代码示例，我们将使用HAL库简化编程：

#include "stm32f1xx_hal.h"

// 定义GPIO和PWM参数
GPIO_TypeDef *GPIOA = GPIOA; // LED连接到GPIOA
uint16_t PWM_CHANNEL = PWM_CHANNEL_1; // 使用第1个PWM通道
 TIM_HandleTypeDef htim1;

void setup(void) {
    RCC_OscInitTypeDef RCC_OscInitStruct;
    TIM_HandleTypeDef TimHandle;

    // 配置时钟系统
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
    HAL_RCC_OscConfig(&RCC_OscInitStruct);
    HAL_RCC_ClockConfig(&RCC_PeriphCLKConfig, FLASH_LATENCY_5);

    // 初始化GPIO
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    // 初始化PWM定时器
    TimHandle.Instance = TIM1;
    TimHandle.Init.Prescaler = 7999; // 根据实际频率调整预分频值
    TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
    TimHandle.Init.Period = 1000; // 设置周期为1s，可以根据需要调整
    TimHandle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    HAL_TIM_PWM_Init(&TimHandle);

    HAL_TIM_MspPostInit(&TimHandle); // 初始化时钟和中断

    // 开启TIM1并设置PWM模式
    HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1);
}

void loop() {
    static uint16_t dutyCycle = 0;
    for (dutyCycle = 0; dutyCycle <= 1000; dutyCycle += 10): // 呼吸灯效果，从低到高再降低
        HAL_TIM_OC_SetCompare(&htim1, PWM_CHANNEL, dutyCycle);
        HAL_Delay(10);
    }
    for (dutyCycle = 1000; dutyCycle > 0; dutyCycle -= 10):
        HAL_TIM_OC_SetCompare(&htim1, PWM_CHANNEL, dutyCycle);
        HAL_Delay(10);
    }