LED点灯，这么写才专业

/**************************************************************************//**

 * [url=home.php?mod=space&uid=288409]@file[/url]     main.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

 * [url=home.php?mod=space&uid=247401]@brief[/url]    GPIO function for level1 training course

 *

 *

 * SPDX-License-Identifier: Apache-2.0

 * [url=home.php?mod=space&uid=17282]@CopyRight[/url] (C) 2018 Nuvoton Technology Corp. All rights reserved.

 *

 ******************************************************************************/



#include <stdio.h>

#include "NuMicro.h"



#define LED_R   PC4

#define LED_G   PC5

#define LED_B   PC3



#define LED_ON      0

#define LED_OFF     1



volatile uint32_t sw1_int_cnt = 0;

volatile uint32_t sw2_int_cnt = 0;



void SYS_Init(void)

{

    /* Enable HXT clock (external XTAL 12MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);



    /* Wait for HXT clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);



    /* Enable LIRC clock */

    CLK_EnableXtalRC(CLK_PWRCTL_LIRCEN_Msk);



    /* Wait for LIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_LIRCSTB_Msk);



    /* Set core clock as PLL_CLOCK from PLL */

    CLK_SetCoreClock(FREQ_48MHZ);



    /* Set PCLK0/PCLK1 to HCLK/2 */

    CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);



    /* Enable module clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Set module clock */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HXT, CLK_CLKDIV0_UART0(1));

}



void UART0_Init()

{

    /* Set GPB multi-function pins to UART0 RXD and TXD */

    SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) |

                    (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);



    /* Configure UART0 and set UART0 baud rate */

    UART_Open(UART0, 115200);

}



void LED_Init(void)

{

    /* Set PC.3 ~ PC.5 to GPIO */

    SYS->GPC_MFPL = (SYS->GPC_MFPL & ~(SYS_GPC_MFPL_PC3MFP_Msk | SYS_GPC_MFPL_PC4MFP_Msk | SYS_GPC_MFPL_PC5MFP_Msk)) |

                    (SYS_GPC_MFPL_PC3MFP_GPIO | SYS_GPC_MFPL_PC4MFP_GPIO | SYS_GPC_MFPL_PC5MFP_GPIO);



    /* Set PC.3 ~ PC.5 to GPIO output */

    GPIO_SetMode(PC, (BIT3 | BIT4 | BIT5), GPIO_MODE_OUTPUT);



    /* Let LED off after initialize */

    LED_R = LED_OFF;

    LED_G = LED_OFF;

    LED_B = LED_OFF;

}



void BTN_Init(void)

{



    /**************  SW1 ***************/

    /* Set PB.4 to GPIO */

    SYS->GPB_MFPL = (SYS->GPB_MFPL & ~(SYS_GPB_MFPL_PB4MFP_Msk)) | (SYS_GPB_MFPL_PB4MFP_GPIO);

    /* Set PB.4 to GPIO intput */

    GPIO_SetMode(PB, BIT4, GPIO_MODE_INPUT);

    GPIO_EnableInt(PB, 4, GPIO_INT_FALLING);

    NVIC_EnableIRQ(GPIO_PAPB_IRQn);



    /**************  SW2 ***************/

    /* Set PB.0 to GPIO */

    SYS->GPB_MFPL = (SYS->GPB_MFPL & ~(SYS_GPB_MFPL_PB0MFP_Msk)) | (SYS_GPB_MFPL_PB0MFP_GPIO);

    /* Set PB.0 to GPIO intput */

    GPIO_SetMode(PB, BIT0, GPIO_MODE_INPUT);

    GPIO_EnableInt(PB, 0, GPIO_INT_FALLING);



    /* Set de-bounce function */

    GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_512);

    GPIO_ENABLE_DEBOUNCE(PB, BIT4);

}



int main(void)

{

    uint32_t sw1_cnt = 0, sw2_cnt = 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();



    printf("+---------------------------------------+\n");

    printf("|    Level1 GPIO control Sample Code    |\n");

    printf("+---------------------------------------+\n\n");



    /* Init LED */

    LED_Init();



    /* Init BTN */

    BTN_Init();



    while(1)

    {

        /* Check if the SW1 is pressed */

        if (sw1_int_cnt != sw1_cnt)

        {

            sw1_cnt = sw1_int_cnt;

            printf("SW1 interrupt count: %d\n", sw1_cnt);

        }

        /* Check if the SW2 is pressed */

        if (sw2_int_cnt != sw2_cnt)

        {

            sw2_cnt = sw2_int_cnt;

            printf("SW2 interrupt count: %d\n", sw2_cnt);

        }

    }

}



void GPABGH_IRQHandler(void)

{

    /* Check if PB.4 the interrupt occurred */

    if(GPIO_GET_INT_FLAG(PB, BIT4))

    {

        LED_R ^= 1;

        sw1_int_cnt++;

        /* Clear PB.4 interrupt flag */

        GPIO_CLR_INT_FLAG(PB, BIT4);

        /* Check if PB.0 the interrupt occurred */

    }

    else if(GPIO_GET_INT_FLAG(PB, BIT0))

    {

        LED_G ^= 1;

        sw2_int_cnt++;

        /* Clear PB.0 interrupt flag */

        GPIO_CLR_INT_FLAG(PB, BIT0);

    }

    else

    {

        /* Un-expected interrupt. Just clear all PB interrupts */

        PB->INTSRC = PB->INTSRC;

        printf("Un-expected interrupts.\n");

    }

}



/*** (C) COPYRIGHT 2019 Nuvoton Technology Corp. ***/