[技术问答] 谁有新塘NUC120的PWM捕获的例子？

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

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

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

 * $Revision: 2 $

 * $Date: 15/04/10 2:04p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Capture the PWMB Channel 1 waveform by PWMB Channel 2.

 * @note

 * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.

 *

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

#include <stdio.h>

#include "NUC100Series.h"



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

/* Macro, type and constant definitions                                                                    */

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



#define PLLCON_SETTING      CLK_PLLCON_50MHz_HXT

#define PLL_CLOCK           50000000





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

/* Global variables                                                                                        */

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



/**

 * @brief       PWMB IRQ Handler

 *

 * @param       None

 *

 * [url=home.php?mod=space&uid=266161]@return[/url]      None

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     ISR to handle PWMB interrupt event

 */

void PWMB_IRQHandler(void)

{

//    uint32_t u32PwmIntFlag;

    uint32_t u32CapIntFlag1;



    /* Handle PWMB Capture function */

    u32CapIntFlag1 = PWMB->CCR2;



    /* PWMB channel 2 Capture interrupt */

    if(u32CapIntFlag1 & PWM_CCR2_CAPIF2_Msk)

    {

        PWMB->CCR2 &= (PWM_CCR_MASK | PWM_CCR2_CAPIF2_Msk);

    }

}



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

/* Capture function to calculate the input waveform information                         */

/* u32Count[4] : Keep the internal counter value when input signal rising / falling     */

/*               happens                                                                */

/*                                                                                      */

/* time    A    B     C     D                                                           */

/*           ___   ___   ___   ___   ___   ___   ___   ___                              */

/*      ____|   |_|   |_|   |_|   |_|   |_|   |_|   |_|   |_____                        */

/* index              0 1   2 3                                                         */

/*                                                                                      */

/* The capture internal counter down count from 0x10000, and reload to 0x10000 after    */

/* input signal falling happens (Time B/C/D)                                            */

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

void CalPeriodTime(PWM_T *PWM, uint32_t u32Ch)

{

    uint16_t u32Count[4];

    uint32_t u32i;

    uint16_t u16RisingTime, u16FallingTime, u16HighPeroid, u16LowPeroid, u16TotalPeroid;



    /* Clear Capture Falling Indicator (Time A) */

    PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);



    /* Wait for Capture Falling Indicator  */

    while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);



    /* Clear Capture Falling Indicator (Time B)*/

    PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);



    u32i = 0;



    while(u32i < 4)

    {

        /* Wait for Capture Falling Indicator */

        while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);



        /* Clear Capture Falling and Rising Indicator */

        PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH | PWM_CAPTURE_INT_RISING_LATCH);



        /* Get Capture Falling Latch Counter Data */

        u32Count[u32i++] = PWM_GET_CAPTURE_FALLING_DATA(PWM, u32Ch);



        /* Wait for Capture Rising Indicator */

        while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);



        /* Clear Capture Rising Indicator */

        PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_RISING_LATCH);



        /* Get Capture Rising Latch Counter Data */

        u32Count[u32i++] = PWM_GET_CAPTURE_RISING_DATA(PWM, u32Ch);

    }



    u16RisingTime = u32Count[1];



    u16FallingTime = u32Count[0];



    u16HighPeroid = u32Count[1] - u32Count[2];



    u16LowPeroid = 0x10000 - u32Count[1];



    u16TotalPeroid = 0x10000 - u32Count[2];



    printf("\nPWM generate: \nHigh Period=7199 ~ 7201, Low Period=16799 ~ 16801, Total Period=23999 ~ 24001\n");

    printf("\nCapture Result: Rising Time = %d, Falling Time = %d \nHigh Period = %d, Low Period = %d, Total Period = %d.\n\n",

           u16RisingTime, u16FallingTime, u16HighPeroid, u16LowPeroid, u16TotalPeroid);

    if((u16HighPeroid < 7199) || (u16HighPeroid > 7201) || (u16LowPeroid < 16799) || (u16LowPeroid > 16801) || (u16TotalPeroid < 23999) || (u16TotalPeroid > 24001))

        printf("Capture Test Fail!!\n");

    else

        printf("Capture Test Pass!!\n");

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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



    /* Enable Internal RC clock */

    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);



    /* Waiting for IRC22M clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);



    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));



    /* Enable external 12MHz XTAL, internal 22.1184MHz */

    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk);



    /* Enable PLL and Set PLL frequency */

    CLK_SetCoreClock(PLL_CLOCK);



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_OSC22M_STB_Msk);



    /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(2));



    /* Enable UART module clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Enable PWM module clock */

    CLK_EnableModuleClock(PWM45_MODULE);

    CLK_EnableModuleClock(PWM67_MODULE);



    /* Select UART module clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));



    /* Select PWM module clock source */

    CLK_SetModuleClock(PWM45_MODULE, CLK_CLKSEL2_PWM45_S_HXT, 0);

    CLK_SetModuleClock(PWM67_MODULE, CLK_CLKSEL2_PWM67_S_HXT, 0);



    /* Reset PWMB channel0~channel3 */

    SYS_ResetModule(PWM47_RST);



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */

    //SystemCoreClockUpdate();

    PllClock        = PLL_CLOCK;            // PLL

    SystemCoreClock = PLL_CLOCK / 1;        // HCLK

    CyclesPerUs     = PLL_CLOCK / 1000000;  // For SYS_SysTickDelay()



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

    /* Init I/O Multi-function                                                                                 */

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

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

    SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);

    SYS->GPB_MFP |= (SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD);



    /* Set GPE multi-function pins for PWMB Channel1 and channel2 */

    SYS->GPE_MFP = SYS_GPE_MFP_PE5_PWM5 | SYS_GPE_MFP_PE0_PWM6;

}



void UART0_Init()

{

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

    /* Init UART                                                                                               */

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

    /* Reset IP */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 Baudrate */

    UART_Open(UART0, 115200);

}



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

/*  Main Function                                                                                          */

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

int32_t main(void)

{

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

       In the end of SYS_Init() will issue SYS_LockReg()

       to lock protected register. If user want to write

       protected register, please issue SYS_UnlockReg()

       to unlock protected register if necessary */



    /* Unlock protected registers */

    SYS_UnlockReg();



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

    SYS_Init();



    /* Lock protected registers */

    SYS_LockReg();



    /* Init UART0 for printf */

    UART0_Init();



    printf("\nSystem clock rate: %d Hz\n", SystemCoreClock);



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

    printf("|                          PWM Driver Sample Code                        |\n");

    printf("|                                                                        |\n");

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

    printf("  This sample code will use PWMB channel 2 to capture\n  the signal from PWMB channel 1.\n");

    printf("  I/O configuration:\n");

    printf("    PWM5(PE.5 PWMB channel 1) <--> PWM6(PE.0 PWMB channel 2)\n\n");

    printf("Use PWMB Channel 2(PE.0) to capture the PWMB Channel 1(PE.5) Waveform\n");



    while(1)

    {

        printf("Press any key to start PWM Capture Test\n");

        getchar();



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

        /* Set the PWMB Channel 1 as PWM output function.                                               */

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



        /* Assume PWM output frequency is 250Hz and duty ratio is 30%, user can calculate PWM settings by follows.

           duty ratio = (CMR+1)/(CNR+1)

           cycle time = CNR+1

           High level = CMR+1

           PWM clock source frequency = __HXT = 12000000

           (CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency

                   = 12000000/2/1/250 = 24000

           (Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)

           CNR = 23999

           duty ratio = 30% ==> (CMR+1)/(CNR+1) = 30%

           CMR = 7199

           Prescale value is 1 : prescaler= 2

           Clock divider is PWM_CSR_DIV1 : clock divider =1

        */



        /* set PWMB channel 1 output configuration */

        PWM_ConfigOutputChannel(PWMB, PWM_CH1, 250, 30);



        /* Enable PWM Output path for PWMB channel 1 */

        PWM_EnableOutput(PWMB, 0x2);



        /* Enable Timer for PWMB channel 1 */

        PWM_Start(PWMB, 0x2);



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

        /* Set the PWMB channel 2  for capture function                                         */

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



        /* If input minimum frequency is 250Hz, user can calculate capture settings by follows.

           Capture clock source frequency = __HXT = 12000000 in the sample code.

           (CNR+1) = Capture clock source frequency/prescaler/clock source divider/minimum input frequency

                   = 12000000/2/1/250 = 24000

           (Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)

           CNR = 0xFFFF

           (Note: In capture mode, user should set CNR to 0xFFFF to increase capture frequency range.)

        */



        /* set PWMB channel 2 capture configuration */

        PWM_ConfigCaptureChannel(PWMB, PWM_CH2, 166, 0);



        /* Enable Backward Compatible: write 1 to clear CFLRI0~3 and CRLRI0~3 */

        PWMB->PBCR = 1;



        /* Enable capture falling edge interrupt for PWMB channel 2 */

        PWM_EnableCaptureInt(PWMB, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);



        /* Enable PWMB NVIC interrupt */

        NVIC_EnableIRQ((IRQn_Type)(PWMB_IRQn));



        /* Enable Timer for PWMB channel 2  */

        PWM_Start(PWMB, 0x4);



        /* Enable Capture Function for PWMB channel 2 */

        PWM_EnableCapture(PWMB, 0x4);



        /* Wait until PWMB channel 2 Timer start to count */

        while(PWMB->PDR2 == 0);



        /* Capture the Input Waveform Data */

        CalPeriodTime(PWMB, PWM_CH2);

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

        /* Stop PWMB channel 1 (Recommended procedure method 1)                                                 */

        /* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */

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



        /* Set PWMB channel 1 loaded value as 0 */

        PWM_Stop(PWMB, 0x2);



        /* Wait until PWMB channel 1 Timer Stop */

        while(PWMB->PDR1 != 0);



        /* Disable Timer for PWMB channel 1 */

        PWM_ForceStop(PWMB, 0x2);



        /* Disable PWM Output path for PWMB channel 1 */

        PWM_DisableOutput(PWMB, 0x2);



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

        /* Stop PWMB channel 2 (Recommended procedure method 1)                                                 */

        /* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */

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



        /* Disable PWMB NVIC */

        NVIC_DisableIRQ((IRQn_Type)(PWMB_IRQn));



        /* Set loaded value as 0 for PWMB channel 2 */

        PWM_Stop(PWMB, 0x4);



        /* Wait until PWMB channel 2 current counter reach to 0 */

        while(PWMB->PDR2 != 0);



        /* Disable Timer for PWMB channel 2 */

        PWM_ForceStop(PWMB, 0x4);



        /* Disable Capture Function and Capture Input path for  PWMB channel 2*/

        PWM_DisableCapture(PWMB, 0x4);



        /* Clear Capture Interrupt flag for PWMB channel 2*/

        PWM_ClearCaptureIntFlag(PWMB, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);

    }

}