STM32 定时器控制微秒延时
定时器控制微秒延时
void MX_TIM3_Init(void)
{
TIM_SlaveConfigTypeDef sSlaveConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim3.Instance = TIM3;
htim3.Init.Prescaler = 16-1;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 10000;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_DISABLE;
sSlaveConfig.InputTrigger = TIM_TS_ITR0;
if (HAL_TIM_SlaveConfigSynchro(&htim3, &sSlaveConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
主程序
//main.c
extern uint64_t microTick;
//初始化
if (HAL_TIM_Base_Start_IT(&htim3) != HAL_OK)
{
Error_Handler();
}
uint64_t getMicroSeconds()
{
return microTick + (htim3.Instance->CNT);
}
void delayMicroseconds(uint32_t micros)
{
uint64_t tickStart = getMicroSeconds();
while ((getMicroSeconds() - tickStart) < micros)
{
}
}
int main(void)
{
while (1)
{
led_on();
delayMicroseconds(1000000);
led_off();
delayMicroseconds(1000000);
}
}
//stm32f0xx_it.c
extern TIM_HandleTypeDef htim3;
volatile uint64_t microTick = 0;
void TIM3_IRQHandler(void)
{
HAL_TIM_IRQHandler(&htim3);
microTick += 10000;
}
kay_2017
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作者：kay_2017
