MSP430FR2433: 捕获引脚确认

你好，

     我们想确认一下，在MSP430FR2433芯片上调试定时器捕获功能，我们将P2.3作为捕获引脚，请帮助确认一下该引脚是否可以作为捕获引脚使用？

     因为我们在文档内查看到下述信息，是否只有P1.1/P1.2/P1.4/P1.5可以用作捕获引脚功能？

Susan Yang：

zhao ge 说：是否只有P1.1/P1.2/P1.4/P1.5可以用作捕获引脚功能？

是的，您的理解是正确的

,

zhao ge：

msp430fr243x_ta0_capture.c (ti.com)

你好，如果我想将改示例代码内的P1.2捕获引脚改为P1.5捕获引脚，具体代码如下：

我尝试将TA0.CCI2A(P1.2)修改为TA1.CCI1A(P1.5)，但是现在回调功能不触发，可以帮助分析一下吗？

#include <msp430.h>#define NUMBER_TIMER_CAPTURES20volatile unsigned int timerAcaptureValues[NUMBER_TIMER_CAPTURES];
unsigned int timerAcapturePointer = 0;int main(void)
{WDTCTL = WDTPW | WDTHOLD;// Stop watchdog timer// Configure GPIOP1DIR |= BIT0;// Set P1.0 as outputP1OUT |= BIT0;// P1.0 highP1SEL1 |= BIT5;// TA0.CCI2A input capture pin, second functionP1REN |= BIT5;// enable internal pull-down resistorP1OUT &= ~BIT5;P2SEL1 |= BIT2;// Set as ACLK pin, second functionP2DIR |= BIT2;// Disable the GPIO power-on default high-impedance mode to activate// previously configured port settingsPM5CTL0 &= ~LOCKLPM5;// Configure clock__bis_SR_register(SCG0);// disable FLLCSCTL3 |= SELREF__REFOCLK;// Set REFO as FLL reference sourceCSCTL0 = 0;// clear DCO and MOD registersCSCTL1 &= ~(DCORSEL_7);// Clear DCO frequency select bits firstCSCTL1 |= DCORSEL_2;// Set DCO = 4MHzCSCTL2 = FLLD_1 + 60;// DCODIV = 2MHz__delay_cycles(3);__bic_SR_register(SCG0);// enable FLLwhile(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1));// Poll until FLL is lockedCSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;// set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz// default DCODIV as MCLK and SMCLK sourceCSCTL5 |= DIVM__1 | DIVS__2;// SMCLK = 1MHz, MCLK = 2MHz// Timer0_A3 SetupTA1CCTL1 |= CM_1 | CCIS_0 | CCIE | CAP | SCS;// Capture rising edge,// Use CCI2A=ACLK,// Synchronous capture,// Enable capture mode,// Enable capture interruptTA1CTL |= TASSEL_2 | MC_2 | TACLR;// Use SMCLK as clock source, clear TA0R// Start timer in continuous mode__bis_SR_register(LPM0_bits | GIE);__no_operation();
}// Timer0_A3 CC1-2, TA Interrupt Handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER1_A1_VECTOR
__interrupt void TIMER1_A1_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_A1_VECTOR))) TIMER0_A1_ISR (void)
#else
#error Compiler not supported!
#endif
{switch(__even_in_range(TA1IV,TA1IV_TAIFG)){case TA1IV_NONE:break;// No interruptcase TA1IV_TACCR1:timerAcaptureValues[timerAcapturePointer++] = TA1CCR1;if (timerAcapturePointer >= 20){while (1){P1OUT ^= 0x01;// Toggle P1.0 (LED)__delay_cycles(100000);}}break;// CCR1 not usedcase TA1IV_TACCR2:break;// CCR2 not usedcase TA1IV_TAIFG:break;// overflowdefault:break;}
}

,

Susan Yang：

下面是我之前成功测试1.4的，您可以看一下，我也来测试一下1.5

/* --COPYRIGHT--,BSD_EX* Copyright (c) 2014, Texas Instruments Incorporated* All rights reserved.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions* are met:** *Redistributions of source code must retain the above copyright*notice, this list of conditions and the following disclaimer.** *Redistributions in binary form must reproduce the above copyright*notice, this list of conditions and the following disclaimer in the*documentation and/or other materials provided with the distribution.** *Neither the name of Texas Instruments Incorporated nor the names of*its contributors may be used to endorse or promote products derived*from this software without specific prior written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.**********************************************************************************MSP430 CODE EXAMPLE DISCLAIMER** MSP430 code examples are self-contained low-level programs that typically* demonstrate a single peripheral function or device feature in a highly* concise manner. For this the code may rely on the device's power-on default* register values and settings such as the clock configuration and care must* be taken when combining code from several examples to avoid potential side* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware* for an API functional library-approach to peripheral configuration.** --/COPYRIGHT--*/
//***************************************************************************************
//MSP430FR24xx Demo - Timer0_A3 Capture of ACLK
//
//Description: Capture a number of periods of the ACLK clock and store them in an array.
//When the set number of periods is captured the program is trapped and the LED on
//P1.0 is toggled. At this point halt the program execution read out the values using
//the debugger.
//ACLK = REFOCLK = 32kHz, MCLK = SMCLK = default DCODIV = 1MHz.
//
//MSP430FR2433
//-----------------
///|\||
//| |P1.2|<-- TA0.CCI2A
//--|RST||
//|P2.2|--> ACLK
//||
//|P1.0|-->LED
//
//
//Wei Zhao
//Texas Instruments Inc.
//Jan 2014
//Built with IAR Embedded Workbench v6.20 & Code Composer Studio v6.0.1
//***************************************************************************************
#include <msp430.h>#define NUMBER_TIMER_CAPTURES20volatile unsigned int timerAcaptureValues[NUMBER_TIMER_CAPTURES];
unsigned int timerAcapturePointer = 0;int main(void)
{WDTCTL = WDTPW | WDTHOLD;// Stop watchdog timer// Configure GPIOP1DIR |= BIT0;// Set P1.0 as outputP1OUT |= BIT0;// P1.0 highP1SEL1 |= BIT4;// TA0.CCI2A input capture pin, second functionP1REN |= BIT4;// enable internal pull-down resistorP1OUT &= ~BIT4;P2SEL1 |= BIT2;// Set as ACLK pin, second functionP2DIR |= BIT2;// Disable the GPIO power-on default high-impedance mode to activate// previously configured port settingsPM5CTL0 &= ~LOCKLPM5;// Configure clock__bis_SR_register(SCG0);// disable FLLCSCTL3 |= SELREF__REFOCLK;// Set REFO as FLL reference sourceCSCTL0 = 0;// clear DCO and MOD registersCSCTL1 &= ~(DCORSEL_7);// Clear DCO frequency select bits firstCSCTL1 |= DCORSEL_2;// Set DCO = 4MHzCSCTL2 = FLLD_1 + 60;// DCODIV = 2MHz__delay_cycles(3);__bic_SR_register(SCG0);// enable FLLwhile(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1));// Poll until FLL is lockedCSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;// set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz// default DCODIV as MCLK and SMCLK sourceCSCTL5 |= DIVM__1 | DIVS__2;// SMCLK = 1MHz, MCLK = 2MHz// Timer0_A3 SetupTA1CCTL2 |= CM_1 | CCIS_0 | CCIE | CAP | SCS;// Capture rising edge,// Use CCI2A=ACLK,// Synchronous capture,// Enable capture mode,// Enable capture interruptTA1CTL |= TASSEL_2 | MC_2 | TACLR;// Use SMCLK as clock source, clear TA0R// Start timer in continuous mode__bis_SR_register(LPM0_bits | GIE);__no_operation();
}// Timer0_A3 CC1-2, TA Interrupt Handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER1_A1_VECTOR
__interrupt void TIMER1_A1_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER1_A1_VECTOR))) TIMER1_A1_ISR (void)
#else
#error Compiler not supported!
#endif
{switch(__even_in_range(TA1IV,TA1IV_TAIFG)){case TA1IV_NONE:break;// No interruptcase TA1IV_TACCR1:break;// CCR1 not usedcase TA1IV_TACCR2:timerAcaptureValues[timerAcapturePointer++] = TA0CCR2;if (timerAcapturePointer >= 20){while (1){P1OUT ^= 0x01;// Toggle P1.0 (LED)__delay_cycles(100000);}}break;// CCR2 not usedcase TA1IV_TAIFG:break;// overflowdefault:break;}
}

,

zhao ge：

Hi Susan Yang

    请问P1.5可以吗？我想知道CCI2A 改为CCI1A还需要改哪些配置？我尝试修改引脚为P1.5,但是中断不会触发，请帮助确认

,

Susan Yang：

抱歉，今天在家办公，板子没在身边

之前我给出的P1.4您是可以成功进入中断的吗？

zhao ge 说：我想知道CCI2A 改为CCI1A还需要改哪些配置？

理论上没有其他需要修改的了

,

zhao ge：

你好，我刚尝试了一下，将您提供的P1.4下述代码进行修改：

// Timer0_A3 SetupTA1CCTL2 |= CM_1 | CCIS_0 | CCIE | CAP | SCS;

修改为

// Timer0_A3 SetupTA1CCTL1 |= CM_1 | CCIS_0 | CCIE | CAP | SCS;

此时P1.5下拉可以触发中断，此时触发的是中断 TA1IV_TACCR1

但是TA0CCR2参数想确认一下，0和2是依据什么修改的？因为此时从TA0CCR2获取的参数是0，所以可能需要尝试其他参数

,

Susan Yang：

zhao ge 说：但是TA0CCR2参数想确认一下，0和2是依据什么修改的？

SFR_16BIT(TA0CCR0); /* Timer0_A3 Capture/Compare 0 */SFR_16BIT(TA0CCR1); /* Timer0_A3 Capture/Compare 1 */SFR_16BIT(TA0CCR2); /* Timer0_A3 Capture/Compare 2 */‘

上面是"msp430fr2433.h"内的描述

zhao ge 说：此时P1.5下拉可以触发中断，此时触发的是中断 TA1IV_TACCR1

SFR_16BIT(TA1CCTL1); /* Timer1_A3 Capture/Compare Control 1 */SFR_16BIT(TA1CCTL2); /* Timer1_A3 Capture/Compare Control 2 */