M051的定时器捕获和PWM捕获

发表于 2019-5-25 22:59

先说定时器捕获

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

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

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

 * $Revision: 4 $

 * $Date: 15/05/22 2:31p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Show how to use the timer1 capture function to capture timer1 counter value.

 * @note

 * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "M051Series.h"



#define PLLCON_SETTING      CLK_PLLCON_50MHz_HXT

#define PLL_CLOCK           50000000





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

/* Global Interface Variables Declarations                                                                 */

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

extern int IsDebugFifoEmpty(void);

volatile uint8_t  g_u8IsWDTTimeoutINT = 0;

volatile uint32_t g_au32TMRINTCount[4] = {0};





/**

 * @brief       Timer0 IRQ

 *

 * @param       None

 *

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

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     The Timer0 default IRQ, declared in startup_M051Series.s.

 */

void TMR0_IRQHandler(void)

{

    /* Clear Timer0 time-out interrupt flag */

    TIMER_ClearIntFlag(TIMER0);



    g_au32TMRINTCount[0]++;

}



/**

 * @brief       Timer1 IRQ

 *

 * @param       None

 *

 * @return      None

 *

 * @details     The Timer1 default IRQ, declared in startup_M051Series.s.

 */

void TMR1_IRQHandler(void)

{

    if(TIMER_GetCaptureIntFlag(TIMER1) == 1)

    {

        /* Clear Timer1 capture interrupt flag */

        TIMER_ClearCaptureIntFlag(TIMER1);



        g_au32TMRINTCount[1]++;

    }

}



/**

 * @brief       Timer2 IRQ

 *

 * @param       None

 *

 * @return      None

 *

 * @details     The Timer2 default IRQ, declared in startup_M051Series.s.

 */

void TMR2_IRQHandler(void)

{

    /* Clear Timer2 time-out interrupt flag */

    TIMER_GetIntFlag(TIMER2);



    g_au32TMRINTCount[2]++;

}



/**

 * @brief       Timer3 IRQ

 *

 * @param       None

 *

 * @return      None

 *

 * @details     The Timer3 default IRQ, declared in startup_M051Series.s.

 */

void TMR3_IRQHandler(void)

{

    /* Clear Timer3 time-out interrupt flag */

    TIMER_GetIntFlag(TIMER3);



    g_au32TMRINTCount[3]++;

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable IRC22M clock */

    CLK->PWRCON |= CLK_PWRCON_IRC22M_EN_Msk;



    /* Waiting for IRC22M clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK->CLKSEL0 = CLK_CLKSEL0_HCLK_S_HIRC;



    /* Set PLL to Power-down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/

    CLK->PLLCON |= CLK_PLLCON_PD_Msk;



    /* Enable external 12 MHz XTAL, IRC10K */

    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk;



    /* Enable PLL and Set PLL frequency */

    CLK->PLLCON = PLLCON_SETTING;



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_IRC10K_STB_Msk);



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

    CLK->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;



    /* Enable peripheral clock */

    CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk |

                  CLK_APBCLK_TMR0_EN_Msk | CLK_APBCLK_TMR1_EN_Msk | CLK_APBCLK_TMR2_EN_Msk | CLK_APBCLK_TMR3_EN_Msk;



    /* Peripheral clock source */

    CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL |

                   CLK_CLKSEL1_TMR0_S_HXT | CLK_CLKSEL1_TMR1_S_HCLK | CLK_CLKSEL1_TMR1_S_HIRC | CLK_CLKSEL1_TMR3_S_HXT;



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set P3 multi-function pins for UART0 RXD, TXD, T0, T1 and T1EX */

    SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P34_T0 | SYS_MFP_P35_T1 | SYS_MFP_P33_T1EX;



    /* Set P1 multi-function pins for T3 */

    SYS->P1_MFP = SYS_MFP_P11_T3;

}



void UART0_Init(void)

{

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

    /* Init UART                                                                                               */

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

    /* Reset IP */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 Baudrate */

    UART_Open(UART0, 115200);

}



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

/*  MAIN function                                                                                          */

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

int main(void)

{

    volatile uint32_t u32InitCount;



    /* 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\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);

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

    printf("|    Timer External Capture Function Sample Code    |\n");

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



    printf("# Timer Settings:\n");

    printf("  Timer0: Clock source is 12 MHz; Toggle-output mode and frequency is 500 Hz.\n");

    printf("  Timer3: Clock source is 12 MHz; Toggle-output mode and frequency is 1 Hz.\n");

    printf("  Timer1: Clock source is HCLK(50 MHz); Continuous counting mode; TCMP is 0xFFFFFF;\n");

    printf("          Counter pin enable; Capture pin and capture interrupt enable;\n");

    printf("# Generate 500 Hz frequency from T0 and connect T0 pin to Timer1 counter pin.\n");

    printf("# Generate 1 Hz frequency from T3 and connect T3 pin to T1EX capture pin.\n");

    printf("# Get 500 event counts from Timer1 counter pin when each T1EX pin interrupt occurred.\n\n");



    /* Initial Timer0 and Timer3 default setting */

    TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000);

    TIMER_Open(TIMER3, TIMER_TOGGLE_MODE, 2);



    /* Initial Timer1 default setting */

    TIMER_Open(TIMER1, TIMER_CONTINUOUS_MODE, 1);



    /* Configure Timer1 setting for external counter input and capture function */

    TIMER_SET_PRESCALE_VALUE(TIMER1, 0);

    TIMER_SET_CMP_VALUE(TIMER1, 0xFFFFFF);

    TIMER_EnableEventCounter(TIMER1, TIMER_COUNTER_FALLING_EDGE);

    TIMER_EnableCapture(TIMER1, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);

    TIMER_EnableCaptureInt(TIMER1);



    /* Enable Timer1 NVIC */

    NVIC_EnableIRQ(TMR1_IRQn);



    /* Clear Timer1 interrupt counts to 0 */

    u32InitCount = g_au32TMRINTCount[1] = 0;



    /* Start Timer0, Timer1 and Timer3 counting */

    TIMER_Start(TIMER0);

    TIMER_Start(TIMER1);

    TIMER_Start(TIMER3);



    /* Check T1EX interrupt counts */

    while(g_au32TMRINTCount[1] <= 10)

    {

        if(g_au32TMRINTCount[1] != u32InitCount)

        {

            printf("[%2d] - %4d\n", g_au32TMRINTCount[1], TIMER_GetCaptureData(TIMER1));

            u32InitCount = g_au32TMRINTCount[1];

        }

    }



    /* Stop Timer0, Timer1 and Timer3 counting */

    TIMER_Close(TIMER0);

    TIMER_Close(TIMER1);

    TIMER_Close(TIMER3);



    printf("*** PASS ***\n");



    while(1);

}



/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/

发表于 2019-5-25 22:59

有多少人知道这两种捕获的区别的吗

发表于 2019-5-25 23:00

PWM捕获

复制

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

 * @file     main.c

 * @version  V1.00

 * $Revision: 4 $

 * $Date: 15/05/22 2:06p $

 * @brief    Capture the PWMB Channel 1 waveform by PWMB Channel 2.

 *

 * @note

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

 *

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

#include <stdio.h>

#include "M051Series.h"



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

/* Macro, type and constant definitions                                                                    */

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



#define PLLCON_SETTING      CLK_PLLCON_50MHz_HXT

#define PLL_CLOCK           50000000



/**

 * @brief       PWMA IRQ Handler

 *

 * @param       None

 *

 * @return      None

 *

 * @details     ISR to handle PWMA interrupt event

 */

void PWMA_IRQHandler(void)

{

    /*In this sample code, user will not use PWMA channel 0~3 PIIR interrupt and CAPIF capture interrupt.

      Defined following code as 0 for reducing interrupt execution time and code size. */

#if 0

    uint32_t u32PwmIntFlag, u32CapIntFlag0, u32CapIntFlag1;



    /* Handle PWMA Capture function */

    u32CapIntFlag0 = PWMA->CCR0;

    u32CapIntFlag1 = PWMA->CCR2;



    if(u32CapIntFlag0 & PWM_CCR0_CAPIF0_Msk)

    {

        PWMA->CCR0 &= (PWM_CCR_MASK | PWM_CCR0_CAPIF0_Msk);

    }



    else if(u32CapIntFlag0 & PWM_CCR0_CAPIF1_Msk)

    {

        PWMA->CCR0 &= (PWM_CCR_MASK | PWM_CCR0_CAPIF1_Msk);

    }



    else if(u32CapIntFlag1 & PWM_CCR2_CAPIF2_Msk)

    {

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

    }



    else if(u32CapIntFlag1 & PWM_CCR2_CAPIF3_Msk)

    {

        PWMA->CCR2 &= (PWM_CCR_MASK | PWM_CCR2_CAPIF3_Msk);

    }



    /* Handle PWMA Timer function */

    u32PwmIntFlag = PWMA->PIIR;



    if(u32PwmIntFlag & PWM_PIIR_PWMIF0_Msk)

    {

        PWMA->PIIR = PWM_PIIR_PWMIF0_Msk;

    }



    else if(u32PwmIntFlag & PWM_PIIR_PWMIF1_Msk)

    {

        PWMA->PIIR = PWM_PIIR_PWMIF1_Msk;

    }



    else if(u32PwmIntFlag & PWM_PIIR_PWMIF2_Msk)

    {

        PWMA->PIIR = PWM_PIIR_PWMIF2_Msk;

    }



    else if(u32PwmIntFlag & PWM_PIIR_PWMIF3_Msk)

    {

        PWMA->PIIR = PWM_PIIR_PWMIF3_Msk;

    }

#endif

}



/**

 * @brief       PWMB IRQ Handler

 *

 * @param       None

 *

 * @return      None

 *

 * @details     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->PWRCON |= CLK_PWRCON_OSC22M_EN_Msk;



    /* Waiting for IRC22M clock ready */

    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));



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

    CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;

    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;

    CLK->CLKDIV &= ~CLK_CLKDIV_HCLK_N_Msk;



    /* Set PLL to power down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/

    CLK->PLLCON |= CLK_PLLCON_PD_Msk;



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

    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk;



    /* Enable PLL and Set PLL frequency */

    CLK->PLLCON = PLLCON_SETTING;



    /* Waiting for clock ready */

    while(!(CLK->CLKSTATUS & (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->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;



    /* Enable IP clock */

    CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_PWM45_EN_Msk | CLK_APBCLK_PWM67_EN_Msk;



    /* IP clock source */

    CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL;



    /* IP clock source */

    CLK->CLKSEL2 = CLK_CLKSEL2_PWM45_S_HXT | CLK_CLKSEL2_PWM67_S_HXT;



    /* Reset PWMB channel0~channel3 */

    SYS->IPRSTC2 = SYS_IPRSTC2_PWM47_RST_Msk;

    SYS->IPRSTC2 = 0;



    /* 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 P3 multi-function pins for UART0 RXD and TXD  */

    SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;

    /* Set P2 multi-function pins for PWMB Channel0~3  */

    SYS->P2_MFP = SYS_MFP_P25_PWM5 | SYS_MFP_P26_PWM6;

}





void UART0_Init(void)

{



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

    /* Init UART                                                                                               */

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

    UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(PLL_CLOCK, 115200);

    UART0->LCR = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;

}







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

/*  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();



    /* Init UART0 for printf */

    UART0_Init();



    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(P2.5 PWMB channel 1) <--> PWM6(P2.6 PWMB channel 2)\n\n");

    printf("Use PWMB Channel 2(P2.6) to capture the PWMB Channel 1(P2.5) 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 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);

    }

}

发表于 2019-5-25 23:00

有大神能出来讲讲吗

发表于 2019-5-25 23:41

PWM定时器可复用为数字输入捕捉功能。如果捕捉功能使能，PWM的输出引脚将被切换至捕捉输入模
式。捕捉器0和PWM0使用同一个定时器，捕捉器1和PWM1使用另一组定时器，以此类推。因此在使用
捕捉功能之前，用户必须预先配置PMW定时器。捕捉功能使能后，捕捉器在输入通道有上升沿跳变
时，将PWM计数器的值锁存至捕捉上升沿锁存寄存器(CRLR)，在输入通道有下降沿跳变时将PWM计数
器值锁存至捕捉下降沿锁存寄存器(CFLR)。捕捉通道0的中断是可编程的，通过设定.CRL_IE0 (CCR0
[1]) (上升沿锁存中断使能)和CFL_IE0(CCR0[2]) (下降沿锁存中断使能) 来决定中断发生的条件。通过设
置.CRL_IE1(CCR0 [17])和.CRL_IE1(CCR0[18])，捕捉通道1有同样的特性。通过设置CCR2中的相应
的控制位，每组的通道2到通道3有同样的特性。对于每一组，不管捕捉何时产生中断0/1/2/3，PWM计
数器0/1/2/3都将在该时刻重载。
最大的捕捉频率受捕捉中断延迟限制。捕捉中断发生时，软件至少要执行三个步骤：读PIIRx 以得到中
断源，读CRLRx/CFLRx(x=0~3) 以得到捕捉值，最后写1清PIIRx为0。如果中断延迟要花时间T0完成，
在这段时间内(T0)，捕捉信号一定不能翻转。在这种情况下，最大的捕捉频率将是1/T0。例如：
HCLK = 50 MHz, PWM_CLK = 25 MHz, 中断延迟时间 900 ns
因此最大的捕捉频率将是1/900ns ≈ 1000 kHz

发表于 2019-5-25 23:42

事件捕获功能
计数器提供输入捕获功能，当TxEx引脚(x= 0~3)上的信号发生改变时，可以捕获TDR的值存到
TCAP寄存器中。为了将TxEX引脚用作事件捕获，RSTCAPSEL (TEXCON[4])应该设为0并且定时
器时钟源应该选择HCLK。
软件可以通过TEXDB(TEXCON[6])位使能/关闭TxEx引脚的防弹跳功能。如果禁止防弹跳功能，输
入事件的频率应该小于HCLK 频率的1/3；如果使能防弹跳功能，输入事件的频率应该小于HCLK 频
率的1/8 。否则，捕获功能可能工作的不正常。软件通过TEX_EDGE (TEXCON[2:1])位可以选择检
测的TxEX引脚的边沿相位。
事件计数模式下，软件不必考虑计数器工作在哪种模式下，只要TxEX引脚上的信号发生变化(符合
用户设定)，捕获事件就会发生。

发表于 2019-11-13 12:40

看到PWM定时器捕获功能，为啥输入的频率是250，捕获频率是160，还有就是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");
，这样的脉宽是如何计算的，这个结果和示波器捕获天壤之别，完全不对呀，有懂的大神说一下

发表于 2019-11-17 18:17

捕获也是需要响应时间的吧

发表于 2019-11-18 20:38

QFGL 发表于 2019-11-13 12:40
看到PWM定时器捕获功能，为啥输入的频率是250，捕获频率是160，还有就是printf("\nPWM generate: \nHigh Pe ...

有人给你那贴回复了。

发表于 2019-11-18 20:38

QFGL 发表于 2019-11-13 12:40
看到PWM定时器捕获功能，为啥输入的频率是250，捕获频率是160，还有就是printf("\nPWM generate: \nHigh Pe ...

测试结果打印什么信息了，测试失败？

发表于 2019-11-19 08:38

補充一下，timer是24bit, pwm capture是16bit，能補抓的長度時間不同
其它就跟5，6樓的描述相同

发表于 2019-11-20 09:51

QFGL 发表于 2019-11-13 12:40
看到PWM定时器捕获功能，为啥输入的频率是250，捕获频率是160，还有就是printf("\nPWM generate: \nHigh Pe ...

就是你捕获的跟实际的不一致？

发表于 2019-11-20 15:09

那个例子看的头疼，特别计算那，不仔细看，真难懂。

[DemoCode下载] M051的定时器捕获和PWM捕获

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