Launchpad的温度测量及串口发送 

 1 #include  "msp430g2553.h"
 2 
 3 void sendChar(unsigned char c)
 4 {
 5   while(!(IFG2&UCA0TXIFG));
 6   UCA0TXBUF=c;
 7 }
 8 
 9 void sendStr(unsigned char *s)
10 {
11       while(*s!='\0')
12       {
13               sendChar(*s);
14               s++;
15       }
16 }
17 
18 void main(void)
19 
20 {
21 
22 unsigned char i;
23 unsigned char temp;
24 unsigned long tempAverage;
25 unsigned long tempMeasured[8];
26 
27 WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
28 
29  BCSCTL1 = CALBC1_1MHZ;                    // Set DCO
30  DCOCTL = CALDCO_1MHZ;
31  BCSCTL2 &= ~(DIVS_3);
32 
33 
34  P1SEL = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD
35  P1SEL2 = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD
36 
37  UCA0CTL1 |= UCSSEL_2;                     // SMCLK
38  UCA0BR0 = 104;                            // 1MHz 9600
39  UCA0BR1 = 0;                              // 1MHz 9600
40  UCA0MCTL = UCBRS0;                        // Modulation UCBRSx = 1
41  UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**
42 
43  //IE2 |= UCA0RXIE;   // Enable USCI_A0 RX interrupt
44  
45   ADC10CTL1 = INCH_10 + ADC10DIV_3;         // Temp Sensor ADC10CLK/4     选择内部温度传感器通道，4分频
46   ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON ;
47   __delay_cycles(1000);                     // Wait for ADC Ref to settle 
48   ADC10CTL0 |= ENC + ADC10SC;
49   
50  _EINT();
51  
52 sendStr("\n======== LaunchPad 温度计=======\n");
53 
54 //__bis_SR_register(LPM0_bits + GIE);       // Enter LPM0, interrupts enabled
55 
56 
57  while(1)
58  {
59     if(i>7)
60     {
61             tempAverage=0;
62             for(;i>0;i--)
63                 tempAverage+=tempMeasured[i-1];
64             tempAverage >>= 3;
65             temp=(unsigned char)( ((tempAverage - 630) * 761) / 1024 );
66                         sendStr("\n 华氏温度：");
67             sendChar(temp%100/10+48);
68             sendChar(temp%10+48);
69                         sendStr("  |   摄氏温度：");                        
70                         temp=(temp-32)*5/9; 
71             sendChar(temp%100/10+48);
72             sendChar(temp%10+48);
73             sendChar('\n');
74 
75     }
76     else
77     {
78          ADC10CTL0 |= ENC + ADC10SC;             // Sampling and conversion start   抽样及转换
79          tempMeasured[i]=ADC10MEM;
80          i++;
81     }
82 
83  __delay_cycles(100000);
84 
85 
86  }
87 }
88 
89 //  Echo back RXed character, confirm TX buffer is ready first
90 /*
91 #pragma vector=USCIAB0RX_VECTOR
92 __interrupt void USCI0RX_ISR(void)
93 {
94  while (!(IFG2&UCA0TXIFG));                // USCI_A0 TX buffer ready?
95  UCA0TXBUF = UCA0RXBUF;                    // TX -> RXed character
96 }
97 
98 */

  和官方模拟串口例程不同，这是使用硬件，需要将板子上的串口跳线帽竖接，即选择HW（Hardware）模式，打开串口助手，可以看到不断更新的温度信息

posted @ 2012-08-19 12:12  sky1991  阅读(2021)  评论(0)  编辑  收藏  举报