LPC17xx GPIO外部中断编程问题

Question

void EINT3_IRQHandler(void)
{
//清除端口中断状态
Chip_GPIOINT_ClearIntStatus (LPC_GPIOINT, 0, 19);

PrintFlag = 1 ;     

}

void TestIntGPIO(void) //中断初始化
{
Chip_GPIOINT_Init(LPC_GPIOINT); //初始化中断LPC_GPIO
Chip_GPIO_SetPinDIRInput (LPC_GPIO, 0, 19);//设置端口为输入方向
//NVIC_ClearPendingIRQ(EINT3_IRQn);//关联中断
NVIC_EnableIRQ(EINT3_IRQn);//使能中断
Chip_GPIOINT_SetIntFalling(LPC_GPIOINT, 0, 19);//设置端口下降沿触发中断

while(1)
{
    if(PrintFlag == 1)
    {
        { /*!!!debug*/
            unsigned char buf[50] = {0};
            sprintf(buf, "##debug -- start Chip_GPIO_WriteDirBit_59 -- 2\r\n");
            UART_Send(0, buf, strlen(buf));
        }

        PrintFlag = 0;

    }
}

}

Answer 1

https://blog.csdn.net/sunflowerfsw/article/details/45675449?locationNum=7&fps=1