LaunchPad 实验六——模拟呼吸灯

只看该作者 · 2012-6-17 19:48

本帖最后由 nwx8899 于 2012-6-18 16:56 编辑

用launchpad 模拟的呼吸灯

这是一个利用msp430 launchpad 产生PWM波形来控制LED2产生呼吸效果的程序

用手机拍了个效果发到优酷了

又拍了个稍微清晰点的http://v.youku.com/v_show/id_XNDE1NTUxMjI4.html

复制

#include "msp430g2231.h"



unsigned int rate=10;

unsigned char updown = 1;



void main(void) {



WDTCTL = WDT_ADLY_16; // WDT 16ms, ACLK, interval timer

//BCSCTL1 = CALDCO_8MHZ; // Set range

//DCOCTL = CALDCO_8MHZ; // Set DCO step + modulation



P1DIR |= BIT0 | BIT6;

P1SEL |= BIT6;

P1OUT = 0;



CCR0 = 128; // PWM Period

CCTL1 = OUTMOD_6; // CCR1 reset/set

CCR1 = rate; // CCR1 PWM duty cycle

TACTL = TASSEL_1 + MC_1; // ACLK, up mode



IE1 |= WDTIE;

_BIS_SR(LPM3_bits + GIE);

while(1);

}



#pragma vector=WDT_VECTOR

__interrupt void interrupt_watchdog_timer(void){

CCR1 = rate;

if(updown){

rate += 3;

if(rate >= 120){

updown = 0;

}

}else{

rate -= 3;

if(rate <= 10){

updown = 1;

}

}



}