MSP430F149学习之路——PWM信号

代码一：

 1 /*******************************
 2 程序功能：ACLK=32768Hz 
 3           PWM波 T=512/32768 占空比75%
 4 *********************************/
 5 
 6 #include <msp430x14x.h>
 7 void main()
 8 {
 9   WDTCTL = WDTPW + WDTHOLD;
10   TACTL  = TASSEL_1 + TACLR;
11   
12   CCTL0 = 0X00;
13   CCTL1 = 0X00;
14   
15   CCR0  = 512-1;    //T=512/32768
16   CCTL1 = OUTMOD_7;
17   CCR1  = 384;      //384/512=0.75
18   CCTL2 = OUTMOD_7;
19  // CCR2  = 124;
20   
21   P1DIR |= BIT2;k
22   P1SEL |= BIT2;
23   P2DIR |= BIT0;
24   P2SEL |= BIT0;
25   
26   TACTL |= MC_1;  
27 }

代码二：

 1 #include <msp430x14x.h>
 2 void int_clk()
 3 {
 4   BCSCTL1 &= ~XT2OFF;
 5   BCSCTL2 |= SELM1 + SELS;  //MCLK-->1MHz SMCLK-->8MHz
 6   do
 7   {
 8     IFG1 &= ~OFIFG;
 9     for(int i=0;i<100;i++)
10       _NOP();
11   }while((IFG1 & OFIFG)!=0);
12   IFG1 &= ~OFIFG;
13 }
14 void main()
15 {
16   WDTCTL = WDTPW + WDTHOLD;
17   int_clk();
18   P1DIR |= BIT0;
19   P1SEL |= BIT0;
20   TACCR0 = 800;  //PWM f=10kHz
21   TACCR1 = 400;   //1:1
22   TACCTL1 |= OUTMOD_7;
23   TACTL  = TASSEL_2 + MC_1;
24 }

代码三：

 1 /******************************
 2 程序功能：在P1.2，P1.6，P2.3及P1.3，P1.7，P2.4同时产生PWM波
 3 *********************************************************/
 4 #include <msp430x14x.h>
 5 void int_clk()
 6 {
 7   BCSCTL1 &= ~XT2OFF;
 8   BCSCTL2 |= SELM_2 + SELS;
 9   do
10   {
11     IFG1 &= ~OFIFG;
12     for(int i=100;i>0;i--)
13       _NOP();
14   }while((IFG1 & OFIFG)!=0);
15   IFG1 &= ~OFIFG;
16 }
17 void main()
18 {
19   WDTCTL = WDTPW + WDTHOLD;
20   int_clk();
21   P2SEL |= BIT3;
22   P2DIR |= BIT3;
23   
24   P1SEL |= BIT6;
25   P1DIR |= BIT6;
26   
27   P1SEL |= BIT2;
28   P1DIR |= BIT2;
29   
30   P1SEL |= BIT3;
31   P1DIR |= BIT3;
32   
33   P1SEL |= BIT7;
34   P1DIR |= BIT7;
35   
36   P2SEL |= BIT4;
37   P2DIR |= BIT4;
38   
39   TACTL |= TASSEL_2 + MC_1 + TACLR;
40   CCR0 = 8000-1;
41   CCR1 = 4000; 
42   CCTL1|=OUTMOD_7;
43   CCR2 = 4000;
44   CCTL2|=OUTMOD_7;
45 }

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posted on 2015-07-09 18:55 LeoSanford 阅读(1177) 评论(0) 编辑收藏举报