Hi.
I’m working on a Nucleo-411, using CubeIDE, and HAL, and I want to read 4 PWM signals from am RC receiver. That is 4 50Hz signals, with a pulse width ranging from 0.5mS to 2.5mS. I’m following the reference manual, and some examples, and so far I can read one channel. Heres my setup for TIM4.
1) Select the active input = as per sConfigIC structure.
2) Program the input filter = NONE
3) Select the edge of the active transition = both edges
4) Program the input prescaler = 99
5) Enable capture from the counter into the capture register by setting the CC1E bit = as per sConfigIC structure.
6) Enable the related interrupt = HAL_TIM_IC_Start_IT(...)
As I understand there is only one interrupt vector for all TIM4 interrupts, and with this setup if I enable the interrupt say for CH1, the interrupt is generated, and I can then complete the ISR. If I enable both CH1 and CH2 interrupts with two separate calls to “HAL_TIM_IC_Start_IT(...)�? then everything freezes. My ISR routine is taken from one of ST's InputCapture examples.
Can someone help me clear up what else is needed.
I hope the code below helps.
TIM_IC_InitTypeDef sConfigIC = {0};
htim4.Instance = TIM4;
htim4.Init.Prescaler = 99;
htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
htim4.Init.Period = 0xFFFF;
htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_IC_Init(&htim4) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_BOTHEDGE;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
if (HAL_TIM_IC_ConfigChannel(&htim4, &sConfigIC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_IC_ConfigChannel(&htim4, &sConfigIC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
if(HAL_TIM_IC_Start_IT(&htim4, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
if(HAL_TIM_IC_Start_IT(&htim4, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
and for completeness.
__HAL_RCC_TIM4_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**TIM4 GPIO Configuration
PB6 ------> TIM4_CH1
PB7 ------> TIM4_CH2
*/
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF2_TIM4;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
HAL_NVIC_SetPriority(TIM4_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(TIM4_IRQn);
