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stm32-course-old/Examples/PWM_RGB/Readme.md

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初始化版本
2 years ago
# PWM_RGB
- 需要打开外部晶振，将SYSCLK配置到72MHz，APB timer clocks也配置到72MHz
- 给PA6、PA7、PB0分别配置TIM3_CH1、TIM3_CH2、TIM3_CH3
- 进入Timers - TIM3
- 勾选Internal Clock
- Channel 1-3都配置PWM Generation CHx
- Prescaler配置为72-1，Counter Period配置为100-1，这样PWM频率是10kHz
- PWM Generation Channelx - Pulse配置为0~99对应亮度低到高
> 占空比 = 此数值 / Counter Period
- HAL_TIM_PWM_Start 启动PWM输出
- __HAL_TIM_SET_COMPARE 可以改变占空比