Button 的 狀態討論

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    uint16_t cnt = 0;
    uint8_t STA = 0;

    /* Unlock protected registers */
    SYS_UnlockReg();
    /* Init System, peripheral clock and multi-function I/O */
    SYS_Init();
    /* Lock protected registers */
    SYS_LockReg();
    /* Init UART0 for printf */
    UART0_Init();


    while(1) {

        STA <<= 1;
        STA += PH0;
		printf("%d \n", PH0);
		TIMER_Delay(TIMER0, 1000000);
        STA &= 3;
        if(STA == 2) {
            cnt++;

            //printf("%d ", cnt);

        }
        //TIMER_Delay(TIMER0, 1000000);

    }

}

STA 原始值 00000000(0)

           二進制 (十進制)

STA :

(CPU執行很快，可能不小心print到數個數字)