TI中文支持网本人写了个程序，想看看捕获功能的计数值，即每次捕获时TA1CCR1的值是多少，还没写测频函数。.程序的功能是用TA0定时模块产生pwm的输出信号，然后用TA1模块进行捕获，但是很奇怪，程序运行时只进入了一次中断，而且TA1CCR1的值为0，不知为何，按照逻辑不应该是不断的产生捕获终端，计数值应该是1000才对吧，请各位大神帮忙看看程序出了什么问题，可能注释也有不对，欢迎更正。
//P1.6 pwm输出，P2.1捕获
int flag=0；
unsigned int temp;
char data[15] = {0x00};
void main()
{
WDTCTL = WDTPW+WDTHOLD; //stop WDT
TA0CTL = TASSEL_2+MC_1+TACLR; //选择smclk,up to ccr0
TA0CCTL1 |= OUTMOD_7;
CCR0 = 2000; //pwm 周期,频率1000000/2000=500HZ
CCR1 = 1000; //占空比50%
TA1CTL = TASSEL_2+MC_1+TACLR; //选择smclk,up to ccr0
TA1CCTL1 |= CM_3+SCS+CAP+CCIE;//捕获设置，上升沿下降捕获，同步，中断使能
P1SEL |= BIT6;
P1DIR = BIT6; //P1.6 output，pwm的输出pin
P2SEL |= BIT1; //P2.1作为捕获输入脚
//_BIS_SR(GIE);
_EINT();
while(1)
{while(flag){_DINT();flag=0;temp = TA1CCR1; //保存计数值/*sprintf(data,"%u",temp1);SendString(data);SendString("\r\n");注释部分为串口打印到电脑端查看TA1CCR1的值*/_EINT();}
}
}
#pragma vector=TIMER1_A1_VECTOR
__interrupt void Timer_A1(void)
{TA1CTL &= ~CCIFG;switch(TA1IV){case 2:flag = 1;break;case 4:break;case 10:break;}return;
}
Lina Lian：
long huang2，
TI MSP430 code example中有个类似的例程，你可以参考一下。具体见附件，说明见下！
//******************************************************************************// MSP430G2xx3 Demo – Timer_A0, Normal Timer Mode Input Period and Dutycycle// measurement// Description: This code example implements input capture in single capture// mode using TimerA in normal timer mode. TA1.1 is configured to output PWM// of 25% dutycycle, that is used as capture input at TA0.1. TA0.1 is// configured as timer input capture that is triggered by both the rising and// the falling edges. An external connection between TA1.1 and TA0.1 is// required in this example. Rising and Falling edges are captured and the// dutycycle is computed. If the measured dutycycle is != 25%, then LED on// P1.0 is set.//// ACLK = LFXT1 = 32kHz crystal ; SMCLK = MCLK = 8 MHz;//// MSP430F51x2// —————–// /|\| XIN|-// | | | 32kHz// –|RST XOUT|-// | |// | P1.2/TA0.1|<– CCI1A <-|// | P2.1/TA1.1|–> CCR1 –>|// | |// | P1.0|–> LED "ON" when dutycycle != 25%// | |
Lina Lian：
回复 Lina Lian:
long huang2，
建议你把对应例程都下载下来吧，或者你已经安装了MSPWare, 具体方法如下：
1. 安装了MSPWare, 见此路径: C:\ti\msp430\MSPWare_2_21_00_39\examples\devices\MSP430G2xx
2. 直接下载对应code example，到TI官网， 搜索对应型号，进入产品页，Tools&software, 下可以看到。其他型号，也可以以类似的方法找。
NamePart#Type
MSP430G2x53, MSP430G2x33, MSP430G2x13, MSP430G2x03 Code Examples (Rev. F) (ZIP 471 KB ) 3,252 views, 18 May 2015
