通过点灯入门430.doc

开始学习430了，本以为有了51的基础学起来会飞快，谁知430的资源太过丰富，一时眼花缭乱，各种寄存器就让我纠结的要死了，开始几天就看例程，在头文件里查阅各种寄存器的功能，然后运用点亮LED灯的方法写程序，学习IO口的设定，中断，定时器。现在还是菜鸟一枚，小小总结一下入门的经验，新手可以参考一下。首先写了这个程序，最简单了，点亮一个灯#includevoid main() WDTCTL = WDTPW + WDTHOLD;/停止开门狗 P2DIR = 0X01; P2OUT = 0xfe; 然后试着写了一个独立按键开关灯的程序，调了一天，还是没有得到满意的结果，还是把代码贴下来，希望能有人批评指正。/*实验目的：K1控制D8,使用中断*/#include/unsigned char f = 0;void main() WDTCTL = WDTPW + WDTHOLD; P2DIR = 0X01;/设置P2.0引脚为输出模式 P2OUT = 0Xef;/刚开始灯全不亮 P1IES = BIT0;/P1.1下降沿触发中断 P1IFG = 0x00;/中断标志位清零 P1IE = BIT0;/允许P1.0位中端 _EINT(); while(1) #pragma vector = PORT1_VECTOR_interrupt void P1_Interrupt(void) if(P1IFG = 0X02)/检测到P1.0触发了中断 P1IFG = 0X00;/中断标志位清零 P2OUT = 0XFE; 接下来是用看门狗作为定时器来控制灯一秒闪烁一次以下两程序，大概的意思是_BIS_SR();/开启括号内的内容_BIS_SR_IRQ();关闭括号内的内容#define LPM3 _BIC_SR (LPM3_bits)#define LPM3_EXIT _BIC_SR_IRQ(LPM3_bits)_BIS_SR(LPM3_bits + GIE);的意思是，开启低功耗，打开中断，但我写两行，LPM3;_EINT();/开启中断函数代替就不行，也不知道为什么/用定时器控制D8一秒闪一下#includevoid P_init()/端口初始化函数/ WDTCTL = WDTPW + WDTHOLD; BCSCTL1 |= DIVA_1; WDTCTL = WDT_ADLY_1000;/定时1秒 IE1 |= WDTIE;/ P2DIR = BIT0;/P2.0设置为输出 P2OUT =0XFE;/P2.0输出低电平 void main()/ unsigned int i;/LPMS_bits低功耗 P_init(); while(1) _BIS_SR(LPM3_bits + GIE);/打开低功耗模式，打开通用中断/还可以直接LPM3; /再单独打开总中断 _EINT();/开启总中断 P2OUT = 0x01; #pragma vector = WDT_VECTOR_interrupt void WDT_Interrupt() _BIC_SR_IRQ(LPM3_bits);/关闭低功耗/LPM3_EXIT;看门狗作为定时器来实现流水灯#includevoid P_init() WDTCTL = WDT_ADLY_1000;/定时一秒 IE1 |= WDTIE; P2DIR = 0XFF; P2OUT = 0XFE;void main() P_init(); while(1) _BIS_SR(LPM3_bits + GIE); P2OUT = 1; P2OUT +=1; if(P2OUT = 0XFF) P2OUT = 0XFE; #pragma vector = WDT_VECTOR_interrupt void WDT_Interrupt() LPM3_EXIT;/ _BIC_SR_IRQ(LPM3_bits);因为框架大致和上面差不多，所以没有注释，只是用来练手的。接下来就开始用定时器A了。#includevoid P_init() WDTCTL = WDTPW + WDTHOLD;/关狗 CCTL0 = CCIE; CCR0 = 10000; TACTL = TASSEL_2 + ID_3 + MC_1; /选择SMCLK时钟源（800kKZ），8分频，增计数模式 P2DIR = 0X01; P2OUT = 0Xff; _EINT();void main() P_init(); while(1) / _BIC_SR(LPM0_bits);/ P2OUT = 0X01; unsigned char i = 0;#pragma vector = TIMERA0_VECTOR_interrupt void Timer_A(void)/LPM0_EXIT; if(i 10) P2OUT = 0X01; i = 0; i+;很奇怪，在看门狗中使用的高低功耗切换的方法不管用了，只能在中断里切换模式。用那种办法，灯会亮很久然后灭掉。就算我给灯设的初始状态时是灭的他也会先亮。先不追究了，以后用的时候注意，尽量避免这种写法。在此算是入门了，接下来要开始模块的学习。最后强烈推荐新手多研究一下msp430x14x.h等几个头文件，430的寄存器都在里面宏定义，注释的蛮清楚的。/* Alternate register names */ by msp430x14x.h#define CCTL0 TACCTL0 /* Timer A Capture/Compare Control 0 */定时器捕获/比较控制0#define CCTL1 TACCTL1 /* Timer A Capture/Compare Control 1 */#define CCTL2 TACCTL2 /* Timer A Capture/Compare Control 2 */#define CCR0 TACCR0 /* Timer A Capture/Compare 0 */#define CCR1 TACCR1 /* Timer A Capture/Compare 1 */#define CCR2 TACCR2 /* Timer A Capture/Compare 2 */#define CCTL0_ TACCTL0_ /* Timer A Capture/Compare Control 0 */#define CCTL1_ TACCTL1_ /* Timer A Capture/Compare Control 1 */#define CCTL2_ TACCTL2_ /* Timer A Capture/Compare Control 2 */#define CCR0_ TACCR0_ /* Timer A Capture/Compare 0 */#define CCR1_ TACCR1_ /* Timer A Capture/Compare 1 */#define CCR2_ TACCR2_ /* Timer A Capture/Compare 2 */#define TASSEL1 (0x0200u) /* Timer A clock source select 0 */定时器的时钟源选择0#define TASSEL0 (0x0100u) /* Timer A clock source select 1 */#define ID1 (0x0080u) /* Timer A clock input divider 1 */#define ID0 (0x0040u) /* Timer A clock input divider 0 */#define MC1 (0x0020u) /* Timer A mode control 1 */#define MC0 (0x0010u) /* Timer A mode control 0 */#define TACLR (0x0004u) /* Timer A counter clear */#define TAIE (0x0002u) /* Timer A counter interrupt enable */#define TAIFG (0x0001u) /* Timer A counter interrupt flag */#define MC_0 (0*0x10u) /* Timer A mode control: 0 - Stop */#define MC_1 (1*0x10u) /* Timer A mode control: 1 - Up to CCR0 */#define MC_2 (2*0x10u) /* Timer A mode control: 2 - Continous up */#define MC_3 (3*0x10u) /* Timer A mode control: 3 - Up/Down */#define ID_0 (0*0x40u) /* Timer A input divider: 0 - /1 */#define ID_1 (1*0x40u) /* Timer A input divider: 1 - /2 */#define ID_2 (2*0x40u) /* Timer A input divider: 2 - /4 */#define ID_3 (3*0x40u) /* Timer A input divider: 3 - /8 */#define TASSEL_0 (0*0x100u) /* Timer A clock source select: 0 - TACLK */#define TASSEL_1 (1*0x100u) /* Timer A clock source select: 1 - ACLK */#define TASSEL_2 (2*0x100u) /* Timer A clock source select: 2 - SMCLK */#define TASSEL_3 (3*0x100u) /* Timer A clock source select: 3 - INCLK */#define CM1 (0x8000u) /* Capture mode 1 */#define CM0 (0x4000u) /* Capture mode 0 */#define CCIS1 (0x2000u) /* Capture input select 1 */#define CCIS0 (0x1000u) /* Capture input select 0 */#define SCS (0x0800u) /* Capture sychronize */#define SCCI (0x0400u) /* Latched capture signal (read) */#define CAP (0x0100u) /* Capture mode: 1 /Compare mode : 0 */#define OUTMOD2 (0x0080u) /* Output mode 2 */#define OUTMOD1 (0x0040u) /* Output mode 1 */#define OUTMOD0 (0x0020u) /* Output mode 0 */#define CCIE (0x0010u) /* Capture/compare interrupt enable */#define CCI (0x0008u) /* Capture input signal (read) */#define OUT (0x0004u) /* PWM Output signal if output mode 0 */#define COV (0x0002u) /* Capture/compare overflow flag */#define CCIFG (0x0001u) /* Capture/compare interrupt flag */#define OUTMOD_0 (0*0x20u) /* PWM output mode: 0 - output only */#define OUTMOD_1 (1*0x20u) /* PWM output mode: 1 - set */#define OUTMOD_2 (2*0x20u) /* PWM output mode: 2 - PWM toggle/reset */#define OUTMOD_3 (3*0x20u) /* PWM output mode: 3 - PWM set/reset */#define OUTMOD_4 (4*0x20u) /* PWM output mode: 4 - toggle */#define OUTMOD_5 (5*0x20u) /* PWM output mode: 5 - Reset */#define OUTMOD_6 (6*0x20u) /* PWM outp