[技术问答] MINI54 ACMP触发定时器 捕获问题

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

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

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

 * $Revision: 5 $

 * $Date: 15/10/06 1:19p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Demonstrate Analog comparator (ACMP) comparison by comparing

 *           CPP0 (P1.5) with Band-gap voltage and shows the result on UART console.

 *

 * @note

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

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

#include <stdio.h>

#include "Mini51Series.h"



/* Function prototype declaration */

void SYS_Init(void);



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. */

    SYS_Init();



    /* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */

    UART_Open(UART, 115200);





    printf("\n\n");

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

    printf("|         Mini51 ACMP Sample Code       |\n");

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



    printf("\nThis sample code demonstrates ACMP0 function. Using ACMP0_P (P1.5) as ACMP0\n");

    printf("positive input and using internal band-gap voltage as the negative input\n");

    printf("The compare result reflects on ACMP0_O (P3.6)\n");



    /* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */

    ACMP_Open(ACMP, 0, ACMP_VNEG_BANDGAP, ACMP_HYSTERESIS_DISABLE);

    /* Enable ACMP0 interrupt function */

    ACMP_ENABLE_INT(ACMP, 0);



    /* Enable ACMP01 interrupt */

    NVIC_EnableIRQ(ACMP_IRQn);



    while(1);



}



void ACMP_IRQHandler(void)

{

    static uint32_t u32Cnt = 0;



    /* Clear ACMP 0 interrupt flag */

    ACMP_CLR_INT_FLAG(ACMP, 0);

    /* Check Comparator 0 Output Status */

    if(ACMP_GET_OUTPUT(ACMP, 0))

        printf("ACMP0_P voltage > Band-gap voltage (%d)\n", u32Cnt);

    else

        printf("ACMP0_P voltage <= Band-gap voltage (%d)\n", u32Cnt);



    u32Cnt++;

}





void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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



    /* Register write-protection disabled */

    SYS_UnlockReg();



    /* Set P5 multi-function pins for XTAL1 and XTAL2 */

    SYS->P5_MFP &= ~(SYS_MFP_P50_Msk | SYS_MFP_P51_Msk);

    SYS->P5_MFP |= (SYS_MFP_P50_XTAL1 | SYS_MFP_P51_XTAL2);



    /* Enable external 12MHz XTAL (UART), internal 22.1184MHz */

    CLK->PWRCON = CLK_PWRCON_XTL12M | CLK_PWRCON_IRC22M_EN_Msk;



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_XTL_STB_Msk | CLK_CLKSTATUS_IRC22M_STB_Msk);



    /* Enable UART and ACMP clock */

    CLK->APBCLK = CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_CMP_EN_Msk;



    /* Select UART clock source from external crystal*/

    CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_UART_S_Msk) | CLK_CLKSEL1_UART_S_XTAL;



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();





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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set P1.5 multi-function pin for ACMP0 positive input pin */

    SYS->P1_MFP = SYS_MFP_P15_CPP0;



    /* Disable digital input path of analog pin ACMP0_P to prevent leakage */

    GPIO_DISABLE_DIGITAL_PATH(P1, (1 << 5));



    /* Set P1 multi-function pins for UART RXD, TXD */

    SYS->P0_MFP = SYS_MFP_P00_TXD | SYS_MFP_P01_RXD;



    /* Register write-protection enabled */

    SYS_LockReg();

}



/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/