STM32 F429 TIM1 Capture Compare always zero - c

Question

I'm building a tachometer using a hall sensor and I tied it to PE13 or Tim1 Channel 3.
Everything seems to be working as the interrupt TIM1_CC_IRQHandler fires at the expected rate, but whenever I run LL_TIM_IC_GetCaptureCH3(TIM1) I only get 0 back from the function call.
Did I miss something in my setup code? Or am I misunderstanding how to use the timer and the LL drivers?
Setup code:
// Enable Timer and Peripheral Clocks
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_TIM1);
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOE);
// Ensure Pins are Configured Correctly
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/**TIM1 GPIO Configuration
PE13 ------> TIM1_CH3
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_13;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
LL_GPIO_Init(GPIOE, &GPIO_InitStruct);
// Register FanTach CLI Comand
FreeRTOS_CLIRegisterCommand( &xFANTACH );
// Configure Timer for Capture Compare
LL_TIM_InitTypeDef TIM_InitStruct = {0};
TIM_InitStruct.Prescaler = 0;
TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
TIM_InitStruct.Autoreload = 0;
TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
TIM_InitStruct.RepetitionCounter = 0;
LL_TIM_Init(TIM1, &TIM_InitStruct);
LL_TIM_DisableARRPreload(TIM1);
LL_TIM_SetClockSource(TIM1, LL_TIM_CLOCKSOURCE_INTERNAL);
LL_TIM_SetTriggerOutput(TIM1, LL_TIM_TRGO_RESET);
LL_TIM_DisableMasterSlaveMode(TIM1);
LL_TIM_IC_SetActiveInput(TIM1, LL_TIM_CHANNEL_CH3, LL_TIM_ACTIVEINPUT_DIRECTTI);
LL_TIM_IC_SetPrescaler(TIM1, LL_TIM_CHANNEL_CH3, LL_TIM_ICPSC_DIV1);
LL_TIM_IC_SetFilter(TIM1, LL_TIM_CHANNEL_CH3, LL_TIM_IC_FILTER_FDIV1);
LL_TIM_IC_SetPolarity(TIM1, LL_TIM_CHANNEL_CH3, LL_TIM_IC_POLARITY_RISING);
/* Set the pre-scaler value to have TIM2 counter clock equal to 10 MHz */
// To get TIM1 counter clock at 10 MHz, the Prescaler is computed as following:
// Prescaler = (TIM1CLK / TIM2 counter clock) - 1
// Prescaler = (TIM1CLK / 10 MHz) - 1
LL_TIM_SetPrescaler(TIM1, __LL_TIM_CALC_PSC(get_pclk2_freq(), 10000000));
//Enable Interrupts
NVIC_SetPriority(TIM1_UP_TIM10_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), PreemptPriority, SubPriority));
NVIC_EnableIRQ(TIM1_UP_TIM10_IRQn);
NVIC_SetPriority(TIM1_CC_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), PreemptPriority, SubPriority));
NVIC_EnableIRQ(TIM1_CC_IRQn);
/* Enable Capture Compare channel 3 for Timer 1 */
LL_TIM_EnableIT_CC3(TIM1);
//Start Input Capture
LL_TIM_CC_EnableChannel(TIM1, LL_TIM_CHANNEL_CH3);
//Enable Counter
LL_TIM_SetCounterMode(TIM1, LL_TIM_COUNTERMODE_UP);
LL_TIM_EnableCounter(TIM1);
}

Answer 1

If anyone stumbles upon this with the same problem, I solved this in two steps:
LL_TIM_DisableARRPreload should be LL_TIM_EnableARRPreload
TIM_InitStruct.Autoreload needs to be set to your max counter value
This allows the timer to automatically reset and gives the up counter a maximum value. For my work I set it to 0xFFFF.