MSP430-pwm方波占空比频率可调.doc

/*/ MSP430 Blink the LED Demo - Software Toggle P1.0/ Description; Toggle P1.0 by xoring P1.0 inside of a software loop./ ACLK = n/a, MCLK = SMCLK = default DCO/ MSP430x5xx/ -/ /| XIN|-/ | | |/ -|RST XOUT|-/ | |/ | P1.0|-LED/ J. Stevenson/ Texas Instruments, Inc/ July 2011/ Built with Code Composer Studio v5/*#include #includetm1638.hunsigned char LED_CODE = 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, 0x77, 0x7C, 0x39,0x5E, 0x79, 0x71 ;float i=1000,j=500;int main(void)float a,b; WDTCTL = WDTPW + WDTHOLD; / Stop watchdog timerif (CALBC1_1MHZ = 0xFF | CALDCO_1MHZ = 0xFF)while (1); / If calibration constants erased, trap CPU!BCSCTL1 = CALBC1_1MHZ; / Set rangeDCOCTL = CALDCO_1MHZ; / Set DCO step + modulationBCSCTL2 = SELM_1 + DIVS_3; /set MCLK=DOC/8 P1DIR |= 0x01; / Set P1.0 to output direction /引脚设置(暂时使用P1.2输出一路PWM) P1SEL |= BIT6; /TA1从P1.6输出 P1DIR |= BIT6; /TA1从P1.6输出 P2DIR |= 0xff; P2OUT |= 0XFF; TACTL |= MC_1 +TASSEL_2+ID_0; /时钟源选择SMCLK，增计数模式 TA设置 TACCTL1 = OUTMOD_7; /模式7 高电平PWM输出PWM设置 init_TM1638(); for(;) TACCR0 = i; TACCR1 = j; if(Read_key()=0) while(Read_key()=0); i=i+10; /调频率 j=b*i/100; if(Read_key()=1) while(Read_key()=1); i=i-10; /调频率 j=b*i/100; if(Read_key()=2) while(Read_key()=2); j=j+10; /调占空比 if(Read_key()=3) while(Read_key()=3); j=j-10; /调占空比 b=j*100/i; / 占空比 Write_DATA(0x00, LED_CODE(int)b/10); Write_DATA(0x02, LED_CODE(int)b%10|0x80); Write_DATA(0x04, LED_CODE(int)(b*10)%10); a=1000000/(8.0*i);/频率 Write_DATA(0x08, LED_CODE(int)a/100); Write_DATA(0x0a, LED_CODE(int)a/10%10); Writ