File content as of revision 1:29fa0989ec31:

#include "mbed.h"
#include "rtos.h"
#include "RZ_A1_Init.h"

InterruptIn button(USER_BUTTON0);
DigitalOut led1(LED1);
Thread * pTestTask = NULL;

#if(0)  // Do not set when using SoftwareStandby.
static void idle_hook(void) {
    __WFI();  // Do not set when using SoftwareStandby.
}
#endif

void SoftwareStandby(void) {
    volatile uint32_t dummy_32;
    volatile uint8_t dummy_8;

    GIC_DisableIRQ(OSTMI0TINT_IRQn);

    // Set the standby_mode_en bit of the power control register in the PL310 to 1.
    L2C.REG15_POWER_CTRL = 0x00000001uL;
    dummy_32 = L2C.REG15_POWER_CTRL;

    // Clear the TME bit in the watchdog timer control/status register (WTCSR) of the watchdog timer to 0 to stop the watchdog timer.
    WDT.WTCSR = 0xA518;
    WDT.WTCNT = 0x5A00;
    WDT.WTCSR = 0xA51D;  // CKS[2:0] = b'101 : 1/1024ｘP0 (7.8ms)

    CPG.STBCR1 = 0x80;
    dummy_8 = CPG.STBCR1;

    __WFI();

    GIC_EnableIRQ(OSTMI0TINT_IRQn);
}

static void interrupt_button(void) {
#if(0)  // It may or may not be present.
    if (pTestTask != NULL) {
        pTestTask->signal_set(1);
    }
#endif
}

void test_task(void) {
    int test_cnt = 0;

    button.fall(&interrupt_button);
    button.rise(&interrupt_button);

    while (true) {
        SoftwareStandby();
#if(0)  // It may or may not be present.
        // It becomes sleep during idle task.
        Thread::signal_wait(1);
#endif
        led1 = !led1;
        printf("%d\n", test_cnt++);
        wait_ms(2);  // Wait for output completion of printf().
    }
}

int main() {
#if(0)  // Do not set when using SoftwareStandby.
    Thread::attach_idle_hook(idle_hook);
#endif
    pTestTask = new Thread();
    pTestTask->start(test_task);
}