GPTを使用した外部パルス幅測定機能

#include "hal_data.h"

FSP_CPP_HEADER
void R_BSP_WarmStart(bsp_warm_start_event_t event);
FSP_CPP_FOOTER

/*******************************************************************************************************************//**
 * main() is generated by the RA Configuration editor and is used to generate threads if an RTOS is used.  This function
 * is called by main() when no RTOS is used.
 **********************************************************************************************************************/
void hal_entry(void)
{
    /* TODO: add your own code here */
    /* モジュールストップ解除 */
    R_SYSTEM->PRCR = 0xA502;
    R_MSTP->MSTPCRD_b.MSTPD11 = 0;  //POEGスタンバイ解除
    R_MSTP->MSTPCRD_b.MSTPD12 = 0;  //GTETRGx端子の読み取りに
    R_MSTP->MSTPCRD_b.MSTPD13 = 0;  //POEGを使っているので
    R_MSTP->MSTPCRD_b.MSTPD14 = 0;  //POEGをモジュール解除しておく
    R_SYSTEM->PRCR = 0xA500;

    (void) R_GPT_Open(&g_timer0_ctrl, &g_timer0_cfg);

    (void) R_GPT_Enable(&g_timer0_ctrl);    //インプットキャプチャ有効

    (void) R_GPT_Start(&g_timer0_ctrl);     //タイマはフリーラン

    while(1)
    {
        __NOP();
    }

#if BSP_TZ_SECURE_BUILD
    /* Enter non-secure code */
    R_BSP_NonSecureEnter();
#endif
}

/*******************************************************************************************************************//**
 * This function is called at various points during the startup process.  This implementation uses the event that is
 * called right before main() to set up the pins.
 *
 * @param[in]  event    Where at in the start up process the code is currently at
 **********************************************************************************************************************/
void R_BSP_WarmStart(bsp_warm_start_event_t event)
{
    if (BSP_WARM_START_RESET == event)
    {
#if BSP_FEATURE_FLASH_LP_VERSION != 0

        /* Enable reading from data flash. */
        R_FACI_LP->DFLCTL = 1U;

        /* Would normally have to wait tDSTOP(6us) for data flash recovery. Placing the enable here, before clock and
         * C runtime initialization, should negate the need for a delay since the initialization will typically take more than 6us. */
#endif
    }

    if (BSP_WARM_START_POST_C == event)
    {
        /* C runtime environment and system clocks are setup. */

        /* Configure pins. */
        R_IOPORT_Open (&IOPORT_CFG_CTRL, &IOPORT_CFG_NAME);

#if BSP_CFG_SDRAM_ENABLED

        /* Setup SDRAM and initialize it. Must configure pins first. */
        R_BSP_SdramInit(true);
#endif
    }
}

#if BSP_TZ_SECURE_BUILD

FSP_CPP_HEADER
BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ();

/* Trustzone Secure Projects require at least one nonsecure callable function in order to build (Remove this if it is not required to build). */
BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ()
{

}
FSP_CPP_FOOTER

#endif

void gpt0_callback (timer_callback_args_t * p_args)
{
    static volatile unsigned long count_a;
    static volatile unsigned long count_u = 0;

    if (TIMER_EVENT_CAPTURE_A  == p_args->event)
    {
        count_a = R_GPT0->GTCCR[0]; //GTCCRA, キャプチャAカウンタ
    }

    if (TIMER_EVENT_CYCLE_END == p_args->event)
    {
        //GTCCLK=120MHzの場合、37秒以上のパルス幅を計測したい場合必要、計測前にcount_uはクリア
        count_u++;
    }
}