割り込みのポーリングについて

#include "hal_data.h"

FSP_CPP_HEADER
void R_BSP_WarmStart(bsp_warm_start_event_t event);
FSP_CPP_FOOTER

void sci_out(unsigned char c);
void sci_out_str(char *c);

/*******************************************************************************************************************//**
 * 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 */

    //SCI9ポート設定(TX:P109, RX:P110)
    R_PMISC->PWPR_b.B0WI = 0;
    R_PMISC->PWPR_b.PFSWE = 1;

    R_PFS->PORT[1].PIN[9].PmnPFS_b.PMR = 0;
    R_PFS->PORT[1].PIN[10].PmnPFS_b.PMR = 0;

    R_PFS->PORT[1].PIN[9].PmnPFS_b.PSEL = 0x5;
    R_PFS->PORT[1].PIN[10].PmnPFS_b.PSEL = 0x5;

    R_PFS->PORT[1].PIN[9].PmnPFS_b.PMR = 1;
    R_PFS->PORT[1].PIN[10].PmnPFS_b.PMR = 1;

    R_PMISC->PWPR_b.PFSWE = 0;
    R_PMISC->PWPR_b.B0WI = 1;

    //SCI9スタンバイ解除
    R_SYSTEM->PRCR = 0xA502;
    R_MSTP->MSTPCRB_b.MSTPB22 = 0;
    R_SYSTEM->PRCR = 0xA500;

    //SCI9初期設定
    R_SCI9->SMR = 0x00;
    R_SCI9->SCR = 0x00;
    R_SCI9->SEMR = 0x40;
    R_SCI9->BRR = 0x0C;         //115,200bps(err=0.16%) ABCS = 0、BDGM = 1;

    //SCI9_RXI 割り込みベクタ
    R_ICU->IELSR_b[4].IELS = 0x1E;

    //送信許可,受信許可,受信割り込み許可
    R_SCI9->SCR = 0x70;

    sci_out_str("\r\nSCI Receive polling test program\r\n");

    while (1)
    {
        if (R_ICU->IELSR_b[4].IR == 1)
        {
            //受信データあり
            R_ICU->IELSR_b[4].IR = 0;   //割り込みフラグクリア
            sci_out(R_SCI9->RDR);       //受信データはエコーバックさせる
        }
    }


#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 (&g_ioport_ctrl, &IOPORT_CFG_NAME);
    }
}

#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 sci_out(unsigned char c)
{
    R_SCI9->TDR = c;
    while ((R_SCI9->SSR & 0x04) != 0x04);
}

void sci_out_str(char *c)
{
    while (*c != '\0')
    {
        sci_out((unsigned char)*c);
        c++;
    }
}