[技术问答] M451,PWM捕获外部脉冲，不用PDMA的有没有?

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

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

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

 * $Revision: 9 $

 * $Date: 15/09/02 10:04a $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Capture the PWM1 Channel 0 waveform by PWM1 Channel 2.

 * @note

 * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.

 *

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

#include <stdio.h>

#include "M451Series.h"



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

/* Macro, type and constant definitions                                                                    */

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

#define PLL_CLOCK       144000000



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

/* Global variables                                                                                        */

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



/**

 * @brief       PWM1 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 PWM1 interrupt event

 */

void PWM1P1_IRQHandler(void)

{

    if(PWM_GetCaptureIntFlag(PWM1, 2) > 1)

    {

        PWM_ClearCaptureIntFlag(PWM1, 2, PWM_CAPTURE_INT_FALLING_LATCH);

    }

}



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

/* 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, u16HighPeriod, u16LowPeriod, u16TotalPeriod;



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

    PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);



    /* Wait for Capture Falling Indicator  */

    while((PWM1->CAPIF & PWM_CAPIF_CFLIF2_Msk) == 0);



    /* 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];



    u16HighPeriod = u32Count[1] - u32Count[2];



    u16LowPeriod = 0x10000 - u32Count[1];



    u16TotalPeriod = 0x10000 - u32Count[2];



    printf("\nPWM generate: \nHigh Period=17279 ~ 17281, Low Period=40319 ~ 40321, Total Period=57599 ~ 57601\n");

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

           u16RisingTime, u16FallingTime, u16HighPeriod, u16LowPeriod, u16TotalPeriod);

    if((u16HighPeriod < 17279) || (u16HighPeriod > 17281) || (u16LowPeriod < 40319) || (u16LowPeriod > 40321) || (u16TotalPeriod < 57599) || (u16TotalPeriod > 57601))

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

    else

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

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable HIRC clock (Internal RC 22.1184MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Select HCLK clock source as HIRC and and HCLK clock divider as 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



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

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);



    /* Waiting for HXT clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);



    /* Set core clock as PLL_CLOCK from PLL */

    CLK_SetCoreClock(PLL_CLOCK);



    /* Waiting for PLL clock ready */

    CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk);



    /* Enable PWM1 module clock */

    CLK_EnableModuleClock(PWM1_MODULE);



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

    /* PWM clock frequency configuration                                                                       */

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

    /* 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_PCLK1, NULL);



    /* 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);

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



    /* Enable UART module clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Select UART module clock source as HXT and UART module clock divider as 1 */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));



    /* Reset PWM1 module */

    SYS_ResetModule(PWM1_RST);



    /* Update System Core Clock */

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                                                                 */

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

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

    SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);

    SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);



    /* Set PC multi-function pins for PWM1 Channel 0 and 2 */

    SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC6MFP_Msk));

    SYS->GPC_MFPL |= SYS_GPC_MFPL_PC6MFP_PWM1_CH0;

    SYS->GPC_MFPH = (SYS->GPC_MFPH & (~SYS_GPC_MFPH_PC11MFP_Msk));

    SYS->GPC_MFPH |= SYS_GPC_MFPH_PC11MFP_PWM1_CH2;

}



void UART0_Init()

{

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

    /* Init UART                                                                                               */

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

    /* Reset UART module */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 baud rate */

    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 UART to 115200-8n1 for print message */

    UART0_Init();



    printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %dHz(PLL@ %dHz)\n", SystemCoreClock, PllClock);

    printf("PWM1 clock is from %s\n", (CLK->CLKSEL2 & CLK_CLKSEL2_PWM1SEL_Msk) ? "CPU" : "PLL");

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

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

    printf("|                                                                        |\n");

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

    printf("  This sample code will use PWM1 channel 2 to capture\n  the signal from PWM1 channel 0.\n");

    printf("  I/O configuration:\n");

    printf("    PWM1 channel 2(PC.11) <--> PWM1 channel 0(PC.6)\n\n");

    printf("Use PWM1 Channel 2(PC.11) to capture the PWM1 Channel 0(PC.6) Waveform\n");



    while(1)

    {

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

        getchar();



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

        /* Set the PWM1 Channel 0 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 = PLL = 72000000

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

                   = 72000000/5/250 = 57600

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

           CNR = 57599

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

           CMR = 17279

           Prescale value is 4 : prescaler= 5

        */



        /* set PWM1 channel 0 output configuration */

        PWM_ConfigOutputChannel(PWM1, 0, 250, 30);



        /* Enable PWM Output path for PWM1 channel 0 */

        PWM_EnableOutput(PWM1, PWM_CH_0_MASK);



        /* Enable Timer for PWM1 channel 0 */

        PWM_Start(PWM1, PWM_CH_0_MASK);



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

        /* Set the PWM1 channel 2 for capture function                                          */

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



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

           Capture clock source frequency = PLL = 72000000 in the sample code.

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

                   = 72000000/5/250 = 57600

           (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.)



           Capture unit time = 1/Capture clock source frequency/prescaler

           69.4ns = 1/72000000/5

        */



        /* set PWM1 channel 2 capture configuration */

        PWM_ConfigCaptureChannel(PWM1, 2, 69, 0);



        /* Enable capture falling edge interrupt for PWM1 channel 2 */

        //PWM_EnableCaptureInt(PWM1, 2, PWM_CAPTURE_INT_FALLING_LATCH);



        /* Enable PWM1 NVIC interrupt */

        //NVIC_EnableIRQ(PWM1P1_IRQn);



        /* Enable Timer for PWM1 channel 2 */

        PWM_Start(PWM1, PWM_CH_2_MASK);



        /* Enable Capture Function for PWM1 channel 2 */

        PWM_EnableCapture(PWM1, PWM_CH_2_MASK);



        /* Enable falling capture reload */

        PWM1->CAPCTL |= PWM_CAPCTL_FCRLDEN2_Msk;



        /* Wait until PWM1 channel 2 Timer start to count */

        while((PWM1->CNT[2]) == 0);



        /* Capture the Input Waveform Data */

        CalPeriodTime(PWM1, 2);

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

        /* Stop PWM1 channel 0 (Recommended procedure method 1)                                                    */

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

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



        /* Set PWM1 channel 0 loaded value as 0 */

        PWM_Stop(PWM1, PWM_CH_0_MASK);



        /* Wait until PWM1 channel 0 Timer Stop */

        while((PWM1->CNT[0] & PWM_CNT_CNT_Msk) != 0);



        /* Disable Timer for PWM1 channel 0 */

        PWM_ForceStop(PWM1, PWM_CH_0_MASK);



        /* Disable PWM Output path for PWM1 channel 0 */

        PWM_DisableOutput(PWM1, PWM_CH_0_MASK);



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

        /* Stop PWM1 channel 2 (Recommended procedure method 1)                                                    */

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

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



        /* Disable PWM1 NVIC */

        //NVIC_DisableIRQ(PWM1P1_IRQn);



        /* Set loaded value as 0 for PWM1 channel 2 */

        PWM_Stop(PWM1, PWM_CH_2_MASK);



        /* Wait until PWM1 channel 2 current counter reach to 0 */

        while((PWM1->CNT[2] & PWM_CNT_CNT_Msk) != 0);



        /* Disable Timer for PWM1 channel 2 */

        PWM_ForceStop(PWM1, PWM_CH_2_MASK);



        /* Disable Capture Function and Capture Input path for  PWM1 channel 2*/

        PWM_DisableCapture(PWM1, PWM_CH_2_MASK);



        /* Clear Capture Interrupt flag for PWM1 channel 2 */

        PWM_ClearCaptureIntFlag(PWM1, 2, PWM_CAPTURE_INT_FALLING_LATCH);

    }

}