M031使用PWM控制LED

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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V1.00

 * $Revision: 10 $

 * $Date: 18/07/17 6:05p $

 * @brief

 *           Change duty cycle of output waveform to show different brightness of

                         Red LED.

 *

 * SPDX-License-Identifier: Apache-2.0

 * Copyright (C) 2018 Nuvoton Technology Corp. All rights reserved.

 *

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

#include <stdio.h>

#include "NuMicro.h"



/*---------------------------------------------------------------------------------------------------------*/

/* Macro, type and constant definitions                                                                    */

/*---------------------------------------------------------------------------------------------------------*/



/*---------------------------------------------------------------------------------------------------------*/

/* Global variables                                                                                        */

/*---------------------------------------------------------------------------------------------------------*/



void SYS_Init(void)

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init System Clock                                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable HIRC clock */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Switch HCLK clock source to HIRC and HCLK source divide 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Enable PWM1 module clock */

    CLK_EnableModuleClock(PWM1_MODULE);



    /*---------------------------------------------------------------------------------------------------------*/

    /* PWM clock frequency configuration                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Set PLL clock as 96 MHz from HIRC/4 */

    CLK_EnablePLL(CLK_PLLCTL_PLLSRC_HIRC_DIV4, 96000000);



    /* Waiting for PLL clock ready */

    CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk);



    /* Select HCLK clock source as PLL and and HCLK clock divider as 2 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL, CLK_CLKDIV0_HCLK(2));



    /* PWM clock frequency can be set equal or double to HCLK by choosing case 1 or case 2 */

    /* case 1.PWM clock frequency is set equal to HCLK: select PWM module clock source as PCLK */

//    CLK_SetModuleClock(PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK0, 0);



    /* case 2.PWM clock frequency is set double to HCLK: select PWM module clock source as PLL */

    CLK_SetModuleClock(PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PLL, NULL);

    /*---------------------------------------------------------------------------------------------------------*/



    /* Reset PWM1 module */

    SYS_ResetModule(PWM1_RST);



    /* Update System Core Clock */

    SystemCoreClockUpdate();



    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Set PC.4 multi-function pins for PWM1 Channel 1 for Red of LED */

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

                    SYS_GPC_MFPL_PC4MFP_PWM1_CH1;

}



/*---------------------------------------------------------------------------------------------------------*/

/*  Main Function                                                                                          */

/*---------------------------------------------------------------------------------------------------------*/

int32_t main(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();

    /* Init System, IP clock and multi-function I/O */

    SYS_Init();

    /* Lock protected registers */

    SYS_LockReg();



    /* Set frequency and duty of PWM1 Channel 1 to control Red LED */

    PWM_ConfigOutputChannel(PWM1, 1, 1, 50);

    /* Enable PWM1 Output path for channel 1 */

    PWM_EnableOutput(PWM1, BIT1);

    /* Start PWM1 Counter */

    PWM_Start(PWM1, BIT1);



    while(1);

}