MSP430F2419: 管脚配置异常

图所示为项目中MSP430F4219的初始化配置（XT2=8MHz），其中注释部分（P6）在调试时异常。

现象：

1、该段代码注释后系统正常运行；加入该段代码，系统无法完成管脚初始化配置；

2、将未注释的代码下载到另一个项目的板子（XT2=6MHz）上，管脚能正常初始化配置。

请教下大家，出现这种问题的原因以及解决的办法。谢谢！

Susan Yang：

q请问是否有直接测试TI例程？您现在测试的有问题的板子，P6的功能是什么？

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//******************************************************************************
//MSP430x26x Demo - Basic Clock, MCLK Configured to Operate from XT2 HF XTAL
//
//Description: Proper selection of an external HF XTAL for MCLK is shown
//using HF XT2 OSC. OFIFG is polled until the HF XTAL is stable; only then is//MCLK sourced by XT2.MCLK is buffered on P5.4 and MCLK/10 is on P1.1 driven//by a software loop taking exactly 10 CPU cycles.
//ACLK = MCLK = LFXT1 = HF XTAL, SMCLK = default DCO ~1.045MHz
////* XT2 HF XTAL NOT INSTALLED ON FET *//
////* Min Vcc required varies with MCLK frequency - refer to datasheet *//
//
//MSP430F261x/241x
//-----------------
///|\|XIN|-
//| ||
//--|RSTXOUT|-
//||
//||
//|XT2IN|-
//|| HF XTAL (400kHz - 16MHz)
//|XT2OUT|-
//||
//|P1.1|-->MCLK/10 = XT2 HFXTAL/10
//|P5.4/MCLK|-->MCLK = XT2 HFXTAL
//
//B. Nisarga
//Texas Instruments Inc.
//September 2007
//Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include <msp430.h>volatile unsigned int i;int main(void)
{WDTCTL = WDTPW + WDTHOLD;// Stop WDTP5DIR |= 0x10;// P5.4= output directionP5SEL |= 0x10;// P5.4= MCLK option selectP1DIR |= 0x02;// P1.1 = output directionBCSCTL1 &= ~XT2OFF;// Activate XT2 high freq xtalBCSCTL3 |= XT2S_2;// 3 � 16MHz crystal or resonatordo{IFG1 &= ~OFIFG;// Clear OSCFault flagfor (i = 0xFF; i > 0; i--);// Time for flag to set}while (IFG1 & OFIFG);// OSCFault flag still set?BCSCTL2 |= SELM_2;// MCLK = XT2 HF XTAL (safe)for (;;)// Infinite loop{P1OUT |= 0x02;// P1.1 = 1P1OUT &= ~0x02;// P1.1 = 0}
}

,

Ice丶Dragon：

不是TI的例程。P6.1、P6.6为普通IO输出配置，P6.4、P6.7为ADC输入配置。

,

Susan Yang：

请看下面的参数

,

Ice丶Dragon：

谢谢

,

Ice丶Dragon：

不好意思，我刚又试了下，问题仍然没解决。

,

Ice丶Dragon：

ADC12SSEL=MCLK=8MHz，ADC12DIV=1/4。

另外我试了一下，将P6全配置为输出也是同样的问题。

,

Ice丶Dragon：

P6.6是P6.4 ADC检测模块的电源控制键，常关状态。现先将P6.6配置，使ADC检测模块正常工作，再配置P6.4为ADC输入，程序运行正常。配置如下：

,

Susan Yang：

谢谢反馈，刚刚正在看您的问题，很高兴您能解决问题

,

Ice丶Dragon：

刚才问题使解决了，但是好像不是根本原因。现在配置换了下也能正常运行了。

再初始化配置的时候其实两种表达效果是一样的。而且之前这样设置也是没有问题。例如下图的代码段就能正常运行。

不知道最根本的原因是啥。为了避免以后出问题，还是按照OK的那种方式来配置。

,

Susan Yang：

谢谢您的反馈

a |= b就是将a,b 做按位”或“运算，结果给a,相当于a = a | b;