stm32调节RGB亮度

要控制RGB灯的亮度，可以使用PWM（脉冲宽度调制技术。下面是一个使用STM32的PWM模块来控制RGB灯亮度的示例代码：

#include "stm32f10x.h"

#define LED_R_PIN GPIO_Pin_8
#define LED_R_PORT GPIOA
#define LED_G_PIN GPIO_Pin_9
#define LED_G_PORT GPIOA
#define LED_B_PIN GPIO_Pin_10
#define LED_B_PORT GPIOA

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

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  GPIO_InitStructure.GPIO_Pin = LED_R_PIN | LED_G_PIN | LED_B_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = 1000;
  TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &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(TIM2, &TIM_OCInitStructure);
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);
  TIM_OC3Init(TIM2, &TIM_OCInitStructure);

  TIM_Cmd(TIM2, ENABLE);
}

void LED_SetColor(uint16_t red, uint16_t green, uint16_t blue)
{
  TIM2->CCR1 = red;
  TIM2->CCR2 = green;
  TIM2->CCR3 = blue;
}

int main(void)
{
  PWM_Configuration();

  while(1)
  {
    LED_SetColor(0, 0, 0); // 关闭灯
    Delay(5000);

    LED_SetColor(1000, 0, 0); // 红灯
    Delay(5000);

    LED_SetColor(0, 1000, 0); // 绿灯
    Delay(5000);

    LED_SetColor(0, 0, 1000); // 蓝灯
    Delay(5000);

    LED_SetColor(1000, 1000, 1000); // 白灯
    Delay(5000);
  }
}

上述代码中的`PWM_Configuration`函数用于初始化STM32的PWM模块，`LED_SetColor`函数用于设置RGB灯的亮度。调用`LED_SetColor`函数时，传入的参数`red`、`green`、`blue`分别代表红、绿、蓝三个颜色通道的亮度，取值范围为0到1000之间的整数。在`main`函数中的示例中，通过不同的亮度值来控制RGB灯的颜色和亮度。