stm32定时器2同道外部计数模式 hal库
时间: 2023-11-29 17:04:49 浏览: 34
好的,关于STM32定时器2的同道外部计数模式,可以使用HAL库来实现。下面是具体的步骤:
1. 配置定时器2为外部计数模式,使能时钟,并设置计数器的自动重装载值。
```c
TIM_HandleTypeDef htim2;
TIM_Encoder_InitTypeDef sConfig;
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 65535;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
sConfig.EncoderMode = TIM_ENCODERMODE_TI12;
sConfig.IC1Polarity = TIM_ICPOLARITY_RISING;
sConfig.IC1Selection = TIM_ICSELECTION_DIRECTTI;
sConfig.IC1Prescaler = TIM_ICPSC_DIV1;
sConfig.IC1Filter = 0;
sConfig.IC2Polarity = TIM_ICPOLARITY_RISING;
sConfig.IC2Selection = TIM_ICSELECTION_DIRECTTI;
sConfig.IC2Prescaler = TIM_ICPSC_DIV1;
sConfig.IC2Filter = 0;
if (HAL_TIM_Encoder_Init(&htim2, &sConfig) != HAL_OK)
{
Error_Handler();
}
```
2. 配置GPIO引脚为定时器引脚,以便将外部信号连接到定时器2。
```c
GPIO_InitTypeDef GPIO_InitStruct;
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin : PA0 */
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/*Configure GPIO pin : PA1 */
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
```
3. 启动定时器2。
```c
HAL_TIM_Encoder_Start(&htim2, TIM_CHANNEL_ALL);
```
4. 在代码中读取定时器2的计数器值,即可得到外部信号的计数值。
```c
int count = htim2.Instance->CNT;
```
以上就是使用HAL库实现STM32定时器2同道外部计数模式的步骤。注意,这里的代码仅供参考,具体实现可能需要根据具体需求进行修改。