stm32F405RGTx的RGB彩灯代码

以下是一个简单的RGB彩灯代码，基于STM32F405RGTx单片机，使用PWM控制三个LED：

#include "stm32f4xx.h"

#define LED_R_Pin GPIO_Pin_6
#define LED_R_GPIO_Port GPIOC
#define LED_G_Pin GPIO_Pin_8
#define LED_G_GPIO_Port GPIOC
#define LED_B_Pin GPIO_Pin_9
#define LED_B_GPIO_Port GPIOC

void TIM_Config(void)
{
    //使能TIM2时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_OCInitTypeDef TIM_OCInitStruct;

    /* 填充结构体 */
    TIM_TimeBaseInitStruct.TIM_Prescaler = 168 - 1; //分频系数为168-1
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
    TIM_TimeBaseInitStruct.TIM_Period = 100 - 1; //自动重载值为100-1，即PWM周期为100us
    TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分割
    TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);

    /* 配置三个输出通道 */
    TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式1
    TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; //输出使能
    TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性高
    TIM_OCInitStruct.TIM_Pulse = 0; //初始占空比为0
    TIM_OC1Init(TIM2, &TIM_OCInitStruct);
    TIM_OC2Init(TIM2, &TIM_OCInitStruct);
    TIM_OC3Init(TIM2, &TIM_OCInitStruct);

    /* 使能输出比较通道 */
    TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);

    /* 启动定时器 */
    TIM_Cmd(TIM2, ENABLE);
}

void LED_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;

    /* 使能GPIOC时钟 */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

    /* 配置GPIOC 6,8,9为复用模式 */
    GPIO_InitStruct.GPIO_Pin = LED_R_Pin | LED_G_Pin | LED_B_Pin;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(LED_R_GPIO_Port, &GPIO_InitStruct);

    /* 将GPIOC 6,8,9连接到TIM2上 */
    GPIO_PinAFConfig(LED_R_GPIO_Port, GPIO_PinSource6, GPIO_AF_TIM2);
    GPIO_PinAFConfig(LED_G_GPIO_Port, GPIO_PinSource8, GPIO_AF_TIM2);
    GPIO_PinAFConfig(LED_B_GPIO_Port, GPIO_PinSource9, GPIO_AF_TIM2);
}

int main(void)
{
    TIM_Config();
    LED_Config();

    uint16_t r = 0, g = 0, b = 0; //红、绿、蓝三个LED的占空比

    while (1)
    {
        /* 红色渐变 */
        for (r = 0; r < 100; r++)
        {
            TIM_SetCompare1(TIM2, r);
            delay(10);
        }

        /* 绿色渐变 */
        for (g = 0; g < 100; g++)
        {
            TIM_SetCompare2(TIM2, g);
            delay(10);
        }

        /* 蓝色渐变 */
        for (b = 0; b < 100; b++)
        {
            TIM_SetCompare3(TIM2, b);
            delay(10);
        }

        /* 混合颜色 */
        for (r = 0; r < 100; r++)
        {
            TIM_SetCompare1(TIM2, r);
            TIM_SetCompare2(TIM2, 100 - r);
            delay(10);
        }

        for (g = 0; g < 100; g++)
        {
            TIM_SetCompare2(TIM2, g);
            TIM_SetCompare3(TIM2, 100 - g);
            delay(10);
        }

        for (b = 0; b < 100; b++)
        {
            TIM_SetCompare1(TIM2, 100 - b);
            TIM_SetCompare3(TIM2, b);
            delay(10);
        }
    }
}

void delay(uint32_t nCount)
{
    for (; nCount != 0; nCount--);
}

注意：此代码仅供参考，需要根据具体的硬件和需求进行修改。