我在调试MSP430FR2033的按键时发现一个很奇怪的问题，我在Debug时可以正常进入按键中断（下降沿触发），但烧录好了之后单独上电就是无法进入中断。我debug没有设置任何断点，直接点击的运行。
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
initGpio();
cs_init();
//uart_init();
limit_int_en();
bat_info_init();
angle_info_init();
vent_self_test();
rtc_wake_isr();
while (1) {
angle_test();
}
}
void limit_int_en(void)
{
P2IFG &= ~(BIT4 | BIT5); //clear P2IFGs
P2IE |= BIT4 | BIT5;
}
void vent_self_test(void)
{
__bis_SR_register(GIE); // General interrupt enable
delay_hw_s(10);
vent_info_init();
angle_en();
timer_start();
motor_init(motor_stop, 10000, 75);
pwm_init();
if (!((P2IN & BIT4) == 0)) {
vent_open();
while (vent.limit_open_flag == ERROR) {
limit_error();
}
}
vent_close();
while (vent.limit_close_flag == ERROR) {
limit_error();
}
if (vent.limit_open_flag == ERROR) {
vent_open();
while (vent.limit_open_flag == ERROR) {
limit_error();
}
}
vent.init_flag = OK;
timer_end();
Angle_correction();
angle_off();
}
// Port 2 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(PORT1_VECTOR))) Port_2 (void)
#else
#error Compiler not supported!
#endif
{
switch (P2IFG) {
case BIT0:
P2IFG &= ~BIT0;
break;
case BIT1:
P2IFG &= ~BIT1;
break;
case BIT2:
P2IFG &= ~BIT2;
break;
case BIT3:
P2IFG &= ~BIT3;
break;
case BIT4: /* P2.4 is LIMIT1 (Vent open), Falling edge*/
P2IFG &= ~BIT4;
//__delay_cycles(10000); // Delay for n*(1/MCLK(8000000)=0.1s
//if (!(P2IN & BIT4)) {
if (motor.motor_flag == open_flag) {
motor_stop_operate();
motor.stop_flag = open_limit_stop;
if (vent.limit_open_flag == ERROR) {
angle.value_open = read_angle_value();
vent.limit_open_flag = OK;
}
led_off();
green_on();
}
//}
break;
case BIT5: /* P2.5 is LIMIT2(Vent close), Falling edge*/
P2IFG &= ~BIT5;
//__delay_cycles(10000); // Delay for n*(1/MCLK(8000000)=0.1s
//if (!(P2IN & BIT5)) {
if (motor.motor_flag == close_flag) {
motor_stop_operate();
motor.stop_flag = close_limit_stop;
if (vent.limit_close_flag == ERROR) {
angle.value_close = read_angle_value();
vent.limit_close_flag = OK;
}
led_off();
blue_on();
}
//}
break;
case BIT6:
P2IFG &= ~BIT6;
break;
case BIT7:
P2IFG &= ~BIT7;
break;
default: break;
}
}
后面我单独对按键进行了测试，发现问题点是在开始时单独对中断标志位清0，还是对P2整个中断标志清0上，如果单独对你需要用的中断清0的话，debug正常，但单独上电异常，难道是单独上电时其他中断标志位初始值不为0？
下面是我的测试代码
/* --COPYRIGHT--,BSD_EX
* Copyright (c) 2014, Texas Instruments Incorporated
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*
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*
* * 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--*/
//******************************************************************************
// MSP430FR413x Demo - Software Port Interrupt Service on P1.3 from LPM3
//
// Description: A Hi/Lo transition on P1.3 will trigger P1ISR the first time.
// On hitting the P1ISR, device exits LPM3 mode and executes section of code in
// main() which includes toggling an LED.
//
// ACLK = default REFO ~32768Hz, MCLK = SMCLK = default DCODIV ~1MHz.
//
//
// MSP430FR4133
// ---------------
// /|\| |
// | | |
// --|RST |
// /|\ | |
// --o--|P1.3 P1.0|-->LED
// \|/ | |
// | |
//
// Cen Fang
// Wei Zhao
// Texas Instruments Inc.
// Oct 2013
// Built with IAR Embedded Workbench v5.60 & Code Composer Studio v5.5
//******************************************************************************
#include <msp430.h>
#include "gpio.h"
#include "led.h"
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
initGpio();
#if (1)
P2IFG = 0x0; //clear P2IFGs,it is good.
//P2IFG &= ~(BIT4 | BIT5); //clear P2.4,P2.5IFGs ,it is bad.
P2IE |= BIT4 | BIT5;
#endif
#if (0)
P2IFG = 0x0; //clear P2IFGs
P2IE = 0x30;
#endif
while(1)
{
__bis_SR_register(LPM3_bits | GIE); // Enter LPM3 w/interrupt
__no_operation(); // For debugger
}
}
// Port 2 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(PORT1_VECTOR))) Port_2 (void)
#else
#error Compiler not supported!
#endif
{
switch (P2IFG) {
case BIT0:
P2IFG &= ~BIT0;
break;
case BIT1:
P2IFG &= ~BIT1;
break;
case BIT2:
P2IFG &= ~BIT2;
break;
case BIT3:
P2IFG &= ~BIT3;
break;
case BIT4: /* P2.4 is LIMIT1 (Vent open), Falling edge*/
P2IFG &= ~BIT4;
led_off();
green_on();
break;
case BIT5: /* P2.5 is LIMIT2(Vent close), Falling edge*/
P2IFG &= ~BIT5;
led_off();
blue_on();
break;
case BIT6:
P2IFG &= ~BIT6;
break;
case BIT7:
P2IFG &= ~BIT7;
break;
default: break;
}
}
