基于STM32用Keil实现PWM彩虹灯控制，编写代码

好的，下面是基于STM32用Keil实现PWM彩虹灯控制的代码：

#include "stm32f10x.h"

#define LED_RED_PIN     GPIO_Pin_8
#define LED_GREEN_PIN   GPIO_Pin_9
#define LED_BLUE_PIN    GPIO_Pin_10

#define PWM_FREQUENCY   1000
#define PWM_PERIOD      (SystemCoreClock/PWM_FREQUENCY-1)

uint16_t pwm_red = 0;
uint16_t pwm_green = 0;
uint16_t pwm_blue = 0;

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

    GPIO_InitStructure.GPIO_Pin = LED_RED_PIN | LED_GREEN_PIN | LED_BLUE_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void PWM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
}

void TIM3_IRQHandler(void)
{
    static uint8_t step = 0;

    if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

        switch (step)
        {
            case 0:
                pwm_red++;
                if (pwm_red >= PWM_PERIOD)
                {
                    pwm_red = PWM_PERIOD;
                    step++;
                }
                break;
            case 1:
                pwm_green++;
                if (pwm_green >= PWM_PERIOD)
                {
                    pwm_green = PWM_PERIOD;
                    step++;
                }
                break;
            case 2:
                pwm_red--;
                if (pwm_red == 0)
                {
                    step++;
                }
                break;
            case 3:
                pwm_blue++;
                if (pwm_blue >= PWM_PERIOD)
                {
                    pwm_blue = PWM_PERIOD;
                    step++;
                }
                break;
            case 4:
                pwm_green--;
                if (pwm_green == 0)
                {
                    step++;
                }
                break;
            case 5:
                pwm_red++;
                if (pwm_red >= PWM_PERIOD)
                {
                    pwm_red = PWM_PERIOD;
                    step++;
                }
                break;
            case 6:
                pwm_blue--;
                if (pwm_blue == 0)
                {
                    step = 0;
                }
                break;
            default:
                break;
        }

        TIM_SetCompare1(TIM3, pwm_red);
        TIM_SetCompare2(TIM3, pwm_green);
        TIM_SetCompare3(TIM3, pwm_blue);
    }
}

int main(void)
{
    GPIO_Configuration();
    PWM_Configuration();
    NVIC_Configuration();

    while (1)
    {
    }
}

以上是基于STM32用Keil实现PWM彩虹灯控制的代码，实现了循环变化的彩虹灯效果。希望对您有所帮助。