unleashed-firmware/firmware/targets/f4/api-hal/api-hal-tim.c

#include "cmsis_os.h"
#include "api-hal-tim.h"

/* setup TIM2 CH1 and CH2 to capture rising and falling events */
void tim_irda_rx_init(void) {
    TIM_ClockConfigTypeDef sClockSourceConfig = {0};
    TIM_MasterConfigTypeDef sMasterConfig = {0};
    TIM_IC_InitTypeDef sConfigIC = {0};

    htim2.Instance = TIM2;
    htim2.Init.Prescaler = 64 - 1;
    htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim2.Init.Period = 4294967295;
    htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
    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();
    }
    if(HAL_TIM_IC_Init(&htim2) != HAL_OK) {
        Error_Handler();
    }
    sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if(HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK) {
        Error_Handler();
    }
    sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;
    sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
    sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
    sConfigIC.ICFilter = 0;
    if(HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_1) != HAL_OK) {
        Error_Handler();
    }
    sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
    sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;
    if(HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_2) != HAL_OK) {
        Error_Handler();
    }

    HAL_NVIC_SetPriority(TIM2_IRQn, 5, 0);
    HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
    HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);
}