LPC55S69外部中断----PINT_nxp lpc55s69 freertos gpio中断-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_50136807/article/details/129056528

文章详细介绍了如何在LPC55S69微控制器上设置按键ISP为外部中断，通过PINT模块进行中断初始化和配置，特别是使用PINT_PinInterruptConfig函数设置上升沿触发中断，并提供了中断回调函数的示例代码。最终实现通过按键控制蓝灯亮灭的功能。

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1.前言

2.设置按键ISP为外部中断

3. 初始化外部中断---PINT

4. PINT_PinInterruptConfig配置PINT外设引脚中断

5.具体代码如下链接

1.前言

此例子为SDK example，如下图

2.设置按键ISP为外部中断

3. 初始化外部中断---PINT

kINPUTMUX_GpioPort0Pin5ToPintsel对于的pin PIO0_5

/*!
 * @brief Call back for PINT Pin interrupt 0-7.
 *  不能有延迟，可以在此回调中翻转gpio等操作
 */
void pint_intr_callback(pint_pin_int_t pintr, uint32_t pmatch_status)
{
    PRINTF("\f\r\nPINT Pin Interrupt %d event detected.", pintr);
}

/*!
 * @brief Main function
 */
int main(void)
{
    /* Board pin, clock, debug console init */
    /* set BOD VBAT level to 1.65V */
    POWER_SetBodVbatLevel(kPOWER_BodVbatLevel1650mv, kPOWER_BodHystLevel50mv, false);
    /* attach 12 MHz clock to FLEXCOMM0 (debug console) */
    CLOCK_AttachClk(kFRO12M_to_FLEXCOMM0);

    BOARD_InitBootPins();
    BOARD_InitBootClocks();
    BOARD_InitDebugConsole();


    //外部中断部分
    /* Connect trigger sources to PINT */
    INPUTMUX_Init(INPUTMUX);              //初始化INPUTMUX，启用INPUTMUX时钟
    INPUTMUX_AttachSignal(INPUTMUX, kPINT_PinInt0, kINPUTMUX_GpioPort0Pin5ToPintsel); //PIO0_5
    /* Turnoff clock to inputmux to save power. Clock is only needed to make changes */
    INPUTMUX_Deinit(INPUTMUX);

    /* Initialize PINT */
    PINT_Init(PINT);

    /* Setup Pin Interrupt 0 for rising edge */
    PINT_PinInterruptConfig(PINT, kPINT_PinInt0, kPINT_PinIntEnableRiseEdge, pint_intr_callback); //配置PINT外设引脚中断
    /* Enable callbacks for PINT0 by Index */
    PINT_EnableCallbackByIndex(PINT, kPINT_PinInt0);


    PRINTF("\r\nPINT Pin Interrupt events are configured\r\n");
    PRINTF("\r\nPress corresponding switches to generate events\r\n");
    while (1)
    {
        __WFI();
    }
}

4. PINT_PinInterruptConfig配置PINT外设引脚中断

其中第三个参数kPINT_PinIntEnableRiseEdge(在上升边产生引脚中断)，总共有三种模式上升沿下降沿和双边沿，其他模式如下图

/*! @brief PINT Pin Interrupt enable type */
typedef enum _pint_pin_enable
{
    kPINT_PinIntEnableNone      = 0U,                 /*!< Do not generate Pin Interrupt */  //不产生引脚中断
    kPINT_PinIntEnableRiseEdge  = PINT_PIN_RISE_EDGE, /*!< Generate Pin Interrupt on rising edge */  //在上升边产生引脚中断
    kPINT_PinIntEnableFallEdge  = PINT_PIN_FALL_EDGE, /*!< Generate Pin Interrupt on falling edge */  //在下降边缘产生引脚中断
    kPINT_PinIntEnableBothEdges = PINT_PIN_BOTH_EDGE, /*!< Generate Pin Interrupt on both edges */  //在两边产生引脚中断
    kPINT_PinIntEnableLowLevel  = PINT_PIN_LOW_LEVEL, /*!< Generate Pin Interrupt on low level */  //在低电平上产生引脚中断
    kPINT_PinIntEnableHighLevel = PINT_PIN_HIGH_LEVEL /*!< Generate Pin Interrupt on high level */  //在高层上产生引脚中断
} pint_pin_enable_t;