【国民技术N32WB031_STB开发板评测】GPIO之按键与LED灯

【国民技术N32WB031_STB开发板评测】创建MDK模版 

1、在这篇创建的基础上，复制这个模版，重命名为N32WB_KEY。并在bsp文件夹下新建key、led两个文件夹，添加好key.c、key.h、led.c、led.h。目录如下：

├─key
│      key.c
│      key.h
├─led
│      led.c
│      led.h

2、用mdk打开工程，把创建bsp/LED\bsp/key分组，并把.c\.h添加进工程：

   3、led.c程序如下：

#include "led.h"


/**
 * @brief  Configures LED GPIO.
 * @param GPIOx x can be A to G to select the GPIO port.
 * @param Pin This parameter can be GPIO_PIN_0~GPIO_PIN_15.
 */
void LedInit(GPIO_Module* GPIOx, uint16_t Pin)
{
    GPIO_InitType GPIO_InitStructure;

    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

    /* Enable the GPIO Clock */
    if (GPIOx == GPIOA)
    {
        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA, ENABLE);
    }
    else if (GPIOx == GPIOB)
    {
        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB, ENABLE);
    }
    else
    {
        return;
    }

    /* Configure the GPIO pin */
    if (Pin <= GPIO_PIN_ALL)
    {
        GPIO_InitStruct(&GPIO_InitStructure);
        GPIO_InitStructure.Pin = Pin;
        GPIO_InitStructure.GPIO_Mode = GPIO_MODE_OUTPUT_PP;
        GPIO_InitPeripheral(GPIOx, &GPIO_InitStructure);
    }
}

/**
 * @brief  Turns selected Led on.
 * @param GPIOx x can be A to G to select the GPIO port.
 * @param Pin This parameter can be GPIO_PIN_0~GPIO_PIN_15.
 */
void LedOn(GPIO_Module *GPIOx, uint16_t Pin)
{
    GPIO_SetBits(GPIOx, Pin);
}

/**
 * @brief  Turns selected Led Off.
 * @param GPIOx x can be A to G to select the GPIO port.
 * @param Pin This parameter can be GPIO_PIN_0~GPIO_PIN_15.
 */
void LedOff(GPIO_Module* GPIOx, uint16_t Pin)
{
    GPIO_ResetBits(GPIOx, Pin);
}

/**
 * @brief  Toggles the selected Led.
 * @param GPIOx x can be A to G to select the GPIO port.
 * @param Pin This parameter can be GPIO_PIN_0~GPIO_PIN_15.
 */
void LedBlink(GPIO_Module* GPIOx, uint16_t Pin)
{
    GPIO_TogglePin(GPIOx, Pin);
}

led.h:

#ifndef __LED_H__
#define __LED_H__
#include "n32wb03x.h"
void LedInit(GPIO_Module* GPIOx, uint16_t Pin);
void LedOn(GPIO_Module *GPIOx, uint16_t Pin);
void LedOff(GPIO_Module* GPIOx, uint16_t Pin);
void LedBlink(GPIO_Module* GPIOx, uint16_t Pin);

#endif

key.c：

#include "key.h"
#include "led.h"
#include "main.h"

/**
 * @brief  Configures key port.
 * @param GPIOx x can be A to G to select the GPIO port.
 * @param Pin This parameter can be GPIO_PIN_0~GPIO_PIN_15.
 */
void KeyInputExtiInit(GPIO_Module* GPIOx, uint16_t Pin)
{
    GPIO_InitType GPIO_InitStructure;
    EXTI_InitType EXTI_InitStructure;
    NVIC_InitType NVIC_InitStructure;

    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

    /* Enable the GPIO Clock */
    if (GPIOx == GPIOA)
    {
        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA | RCC_APB2_PERIPH_AFIO, ENABLE);
    }
    else if (GPIOx == GPIOB)
    {
        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB | RCC_APB2_PERIPH_AFIO, ENABLE);
    }
    else
    {
        return;
    }

    /*Configure the GPIO pin as input floating*/
    if (Pin <= GPIO_PIN_ALL)
    {
        GPIO_InitStruct(&GPIO_InitStructure);
        GPIO_InitStructure.Pin          = Pin;
        GPIO_InitStructure.GPIO_Pull    = GPIO_PULL_UP;
        GPIO_InitPeripheral(GPIOx, &GPIO_InitStructure);
    }

    /*Configure key EXTI Line to key input Pin*/
    GPIO_ConfigEXTILine(KEY_INPUT_PORT_SOURCE, KEY_INPUT_PIN_SOURCE);

    /*Configure key EXTI line*/
    EXTI_InitStructure.EXTI_Line    = KEY_INPUT_EXTI_LINE;
    EXTI_InitStructure.EXTI_Mode    = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; // EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_InitPeripheral(&EXTI_InitStructure);

    /*Set key input interrupt priority*/
    NVIC_InitStructure.NVIC_IRQChannel                   = KEY_INPUT_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority           = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

ke.y:

#ifndef __KEY_H__
#define __KEY_H__
#include "n32wb03x.h"


void KeyInputExtiInit(GPIO_Module* GPIOx, uint16_t Pin);

#endif

4、在n32wb03_it.c中添加按键中断程序：

void EXTI2_3_IRQHandler(void)
{
    if (RESET != EXTI_GetITStatus(KEY_INPUT_EXTI_LINE))
    {
        if(GPIO_ReadInputDataBit(KEY_INPUT_PORT, KEY_INPUT_PIN) == RESET)
        {
            Delay(10);
            if(GPIO_ReadInputDataBit(KEY_INPUT_PORT, KEY_INPUT_PIN) == RESET)
            {
                LedBlink(LED2_PORT, LED2_PIN);
            }
        }
        EXTI_ClrITPendBit(KEY_INPUT_EXTI_LINE);
    }
}

【注】这里只是演示所用，不能在实际项目中运行

然后在主程序里初始化key\led

#include "led.h"
#include "key.h"

int main(void)
{

    LedInit(LED1_PORT, LED1_PIN);
    LedInit(LED2_PORT, LED2_PIN);
    

    LedOn(LED1_PORT, LED1_PIN);
    LedOn(LED2_PORT, LED2_PIN);
		KeyInputExtiInit(KEY_INPUT_PORT, KEY_INPUT_PIN);
    while (1)
    {
        LedBlink(LED1_PORT, LED1_PIN);


        Delay(0x28FFFF);


    }
}

这样就可以实现LED1的周期闪烁，当按下Button1时翻转LED2【注】由于在中断中用了延时，所以效果不是很好，等讲了定时器，会进行优化。

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