STM32 定时器250us计数一个,定时器8 每4ms去获取这个计数。用hal库表达
时间: 2024-02-05 09:12:34 浏览: 22
可以采用以下步骤:
1. 配置 TIM2 定时器为 250us 计数一次。
```c
TIM_HandleTypeDef htim2;
void MX_TIM2_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim2.Instance = TIM2;
htim2.Init.Prescaler = 72 - 1; // 72MHz 时钟,分频为 72,计数时钟为 1MHz
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 250 - 1; // 计数周期为 250us
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
```
2. 配置 TIM8 定时器为 4ms 计数一次。
```c
TIM_HandleTypeDef htim8;
void MX_TIM8_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim8.Instance = TIM8;
htim8.Init.Prescaler = 7200 - 1; // 72MHz 时钟,分频为 7200,计数时钟为 10KHz
htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
htim8.Init.Period = 40 - 1; // 计数周期为 4ms
htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_Base_Init(&htim8) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim8, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
```
3. 在 TIM8 定时器的定时器中断处理函数中获取 TIM2 的计数值,并将计数值清零。
```c
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim == &htim8)
{
uint32_t count = __HAL_TIM_GET_COUNTER(&htim2);
__HAL_TIM_SET_COUNTER(&htim2, 0);
// 进行计数值的处理操作
}
}
```