RGB_LED是一种有特色的器件，它将红绿蓝三种色彩集成在同一器件中，依赖这三基色可以组合出多种多样的色彩，那如何才能展示这种效果呢？ 借助L432的多通道PWM输出功能可以轻松地实现这一功能，它只需一个RGB_LED、3个2K的限流电阻及少量导线即可。其显示效果如下图所示，程序只需将main()函数中的while(1){} 循环改为如下的程序就行了。 由于器件中的3个发光点并不在一点，所以色彩的混合效果不均匀，因此最好在该器件前附上一层纸来辅助混光。 色彩环变换效果图 - 色彩环变换效果程序：
- while (1)
- {
- for(n=0;n<3;n++) // 以三基色组合色彩
- {
- for(i=0;i<100;i++) // 调节色彩的亮度
- {
- if(n==0)
- {
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*(100-i)/100); // R
- HAL_tiM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_2);
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*i/100); // G
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_3);
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*0); // B
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1);
- }
- if(n==1)
- {
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*0); // R
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_2);
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*(100-i)/100); // G
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_3);
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*i/100); // B
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1);
- }
- if(n==2)
- {
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*i/100); // R
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_2);
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*0); // G
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_3);
- sConfig.Pulse = (uint32_t) (PERIOD_VALUE*(100-i)/100); // B
- HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1);
- HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1);
- }
- // 延时处理
- for(j=0;j<2000;j++)
- {
- for(k=0;k<2000;k++);
- }
- }
- }
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