MSP430流水灯Ⅱ

//流水灯三种流动方式和四种流动速度

#include

typedef unsigned int uint;

uint i = 0,j = 0,dir = 0;

uint flag = 0,speed = 0;

void main( void )

{

P1DIR = 0XFF;P1OUT = 0XFF;

P2DIR = 0XFF;P2OUT = 0XFF;

P3DIR = 0XFF;P3OUT = 0XFF;

P4DIR = 0XFF;P4OUT = 0XFF;

P5DIR = 0XFF;P5OUT = 0XFF;

P6DIR = 0XFF;P6OUT = 0XFF;

// Stop watchdog timer to prevent time out reset

WDTCTL = WDTPW + WDTHOLD;

P6DIR |= BIT2;

P6OUT |= BIT2;

P5OUT &= ~BIT7;

CCTL0 = CCIE;

CCR0 = 50000;

TACTL = TASSEL_2 + ID_3 + MC_1;

P2DIR = 0XFF;

P2OUT = 0XFF;

_EINT();

LPM0;

}

#pragma vector = TIMERA0_VECTOR

__interrupt void Timer_A(void)

{

if(flag == 0)

{

P2OUT =~(0x80>>(i++));

}

else if(flag == 1)

{

P2OUT =~(0x01<<(i++));

}

else

{

if(dir)

{

P2OUT =~(0x80>>(i++));

}

else

{

P2OUT =~(0x01<<(i++));

}

}

if(i == 8)

{

i = 0;

dir = ~dir;

}

j++;

if(j == 40)

{

i = 0;

j = 0;

flag++;

if(flag == 4)

flag = 0;

switch(speed)

{

case 0:

TACTL &= ~ (ID0 + ID1);

TACTL |= ID_3;

case 1:

TACTL &= ~ (ID0 + ID1);

TACTL |= ID_2;

case 2:

TACTL &= ~ (ID0 + ID1);

TACTL |= ID_1;

case 3:

TACTL &= ~ (ID0 + ID1);

TACTL |= ID_0;

default:

break;

}

if(flag !=3) speed++;

if(speed == 4) speed = 0;

}

}

在中断中设置了，流水方向速度。通过设置TACTL寄存器的值设置流水速度