stm32f103rct6输出pwm波1mhz
时间: 2023-09-14 07:06:42 浏览: 156
要输出1MHz的PWM波,需要满足以下条件:
1. PWM的周期为1/1MHz = 1us。
2. PWM的占空比需要根据具体应用场景确定。
STM32F103RCT6的定时器可以实现PWM功能,以下是基本的步骤:
1. 初始化定时器,使其工作在PWM模式下。
2. 设置定时器的预分频器和计数值,以满足PWM周期要求。
3. 根据具体应用场景,设置PWM的占空比。
具体的代码实现可以参考以下示例:
```c
// 初始化定时器
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 72 - 1; // 定时器计数值
TIM_TimeBaseStructure.TIM_Prescaler = 1 - 1; // 定时器预分频器
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
// 配置PWM输出
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse = 36 - 1; // PWM占空比
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
// 启动定时器
TIM_Cmd(TIM2, ENABLE);
```
这里的定时器是TIM2,预分频器设置为1-1,计数值设置为72-1,这样定时器的计数周期为1us。占空比设置为36-1,这样PWM的占空比为50%。如果需要更改占空比,只需要修改TIM_OCInitStructure.TIM_Pulse的值即可。
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