Posted on February 22, 2016 at 09:16
Hello,
I want to get a frequency of an input signal using the stm32f4xx with the HAL library.
Signal comes in PB4. I checked the working input with a simple gpio configuration.
My following input capture code looks like this:
void
MX_TIM3_Init(
void
)
{
__TIM3_CLK_ENABLE();
HAL_NVIC_SetPriority(TIM3_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(TIM3_IRQn);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_PIN_4;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF2_TIM3;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 0xFFFF;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&htim3);
TIM_ClockConfigTypeDef sClockSourceConfig;
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);
HAL_TIM_IC_Init(&htim3);
TIM_MasterConfigTypeDef sMasterConfig;
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);
TIM_IC_InitTypeDef sConfigIC;
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
HAL_TIM_IC_ConfigChannel(&htim3, &sConfigIC, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1);
}
void
TIM3_IRQHandler(
void
)
{
// printf
if
(__HAL_TIM_GET_ITSTATUS(&htim3, TIM_IT_CC1) == SET)
{
__HAL_TIM_CLEAR_IT(&htim3, TIM_IT_CC1);
}
}
But the irq handler gets never called. (Without IC Config it does get called).
Could anyone help me with this? Thank you!
#input #stm32f4 #capture #no-hablo-hal
