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定时器 ​

基本定时器 ​

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基本定时器的计数模式和时钟分频因子是没有用的, 也没有重复计数器

生成PWM ​

配置 ​

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PWM模式只需要设置前面三个

实际的使用 ​

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测量脉冲长度 ​

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捕获脉冲 ​

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高级定时器输出指定数量的PWM ​

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输出比较 ​

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带死区的PWM输出 ​

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比较极性就是有效电平, 空闲状态下的电平就是刹车以后得电平

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关闭状态就是定时器不工作时候的输出信号设置

锁寄存器也不使用

自动恢复会在下一个时钟更新事件以后恢复输出

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捕获PWM ​

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c
	HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1);
	HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);

开启的时候只打开了通道一的中断

c
uint32_t ccrl_val1a=0, ccrl_val1b=0, frq1 = 0, ccrl_val2a=0, ccrl_val2b=0, frq2 = 0;
float duty1 = 0, duty2 = 0;
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim){
	if(htim->Instance==TIM2)
	{
		ccrl_val1a = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);//获取捕获到的值
		ccrl_val1b = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
		__HAL_TIM_SetCounter(htim, 0);
		frq1 = (80000000/80)/ccrl_val1a;//计算周期
		duty1 = (ccrl_val1b*1.0/ccrl_val1a)*100;//计算占空比
		HAL_TIM_IC_Start(htim, TIM_CHANNEL_1);//重新使能通道
		HAL_TIM_IC_Start(htim, TIM_CHANNEL_2);
	}
	if(htim->Instance==TIM3)
	{
		ccrl_val2a = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
		ccrl_val2b = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
		__HAL_TIM_SetCounter(htim, 0);
		frq2 = (80000000/80)/ccrl_val2a;
		duty2 = (ccrl_val2b*1.0/ccrl_val2a)*100;
		HAL_TIM_IC_Start(htim, TIM_CHANNEL_1);
		HAL_TIM_IC_Start(htim, TIM_CHANNEL_2);
	}
}

电容按键 ​

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