本帖最后由 ZK1509629967 于 2017-4-28 22:57 编辑
#include
#define uchar unsigned char
//uchar RXdata;
void cesu (void);
void com_process_S(void); //测速
#define M 10 //测速10次取平均值
unsigned int cap,N1;
long width[10]={0,0,0,0,0,0,0,0,0,0};
char m,k,i=0;
long data,zhuansu=0;
//uchar com_value; //定义键值全局变量
//unsigned char number[];
//unsigned char digit=0;
int main(void)
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
WDTCTL = WDTPW |WDTHOLD;
// Configure GPIO
P2SEL1 |= BIT0 | BIT1; // USCI_A0 UART operation
P2SEL0 &= ~(BIT0 | BIT1);
// Disable the GPIO power-on default high-impedance mode to activate
// previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
// Startup clock system with max DCO setting ~8MHz
CSCTL0_H = CSKEY >> 8; // Unlock clock registers
CSCTL1 = DCOFSEL_3 | DCORSEL; // Set DCO to 8MHz
CSCTL2 = SELA__VLOCLK | SELS__DCOCLK | SELM__DCOCLK;// Set ACLK = VLO; SMCLK = DCO/8=1M HZ
CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1; // Set all dividers
CSCTL0_H = 0; // Lock CS registers
// Configure USCI_A0 for UART mode
UCA0CTLW0 = UCSWRST; // Put eUSCI in reset
UCA0CTLW0 |= UCSSEL__SMCLK; // CLK = SMCLK
// Baud Rate calculation
// 8000000/(16*9600) = 52.083
// Fractional portion = 0.083
// User's Guide Table 21-4: UCBRSx = 0x04
// UCBRFx = int ( (52.083-52)*16) = 1
UCA0BR0 = 52; // 8000000/16/9600
UCA0BR1 = 0x00;
UCA0MCTLW |= UCOS16 | UCBRF_1;
UCA0CTLW0 &= ~UCSWRST; // Initialize eUSCI
UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt
cesu();
P1DIR=0xFF;
P3DIR|=BIT0;
P3DIR&=~BIT4;
//__bis_SR_register(LPM3_bits | GIE); // Enter LPM3, interrupts enabled
__no_operation(); // For debugger
while (1)
{
P1OUT|=BIT3;//P1.3=1
P1OUT&=~BIT4;//P1.4=0
//delay_us(1024);
P3OUT|=BIT0;
__delay_cycles(10);
com_process_S();
}
}
// Timer_B7 Interrupt Vector (TBIV) handler
#pragma vector=TIMER0_B1_VECTOR
__interrupt void Timer0_B1_ISR(void)
{
switch( TB0IV )
{
case 6:
if(TB0CCTL3&CM1) //捕获到下降沿
{
width[m++]=65536*N1+TB0CCR3-cap; //记录下结束时间
N1=0;
TB0CCTL3=CM_1+SCS+CAP+CCIE;//+TBCLR; //改为上升沿捕获:CM1置0,CM0置1
if(m==M)
m=0;
}
else if(TB0CCTL3&CM0) //捕获到上升沿
{
cap=TB0CCR3;
N1=0;
TB0CCTL3=CM_2+SCS+CAP+CCIE;//+TBCLR; //改为下降沿捕获：CM0置0,CM1置1
}
break;
case 14:
N1++;
break;
}// 溢出
}
void com_process_S(void) //测速
{
//测速10次
data=0;
for(k=0;k
data+=width[k];
data=data/M;
data=1000000/data;
zhuansu=data;
UCA0TXBUF=zhuansu;
UCA0TXBUF='r';
UCA0TXBUF='n';
}
void cesu (void)
{
P3SEL0|=BIT4; //P3.4作为捕获模块功能的输入端输入方波
P3SEL1&=~BIT4;
// TBCCTL0=0; // 捕获源为P3.4,即CCI0A(也是CCI0B)
TBCCTL3|=CM_1+CCIS_0+SCS+CAP+CCIE; //上升沿捕获,同步捕获,工作在捕获模式+中断允许
TB0CTL|=TBSSEL_2+MC_2+ TBIE; //选择时钟SMCLK+连续计数模式+中断允许
_EINT();
}
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