timer-A-capture-function.rar_1611_Capture_timer A capture

#include "msp430x16x.h" #include "nokia_5110.h" #include "nokia_5110.c" #define uchar unsigned char #define uint unsigned int #define CPU_F ((double)8000000) //定义CPU 的时钟频率为8M #define delay_us(x) __delay_cycles((long)(CPU_F*(double)x/1000000.0))// 定义延时1us #define delay_ms(x) __delay_cycles((long)(CPU_F*(double)x/1000.0)) // 定义延时1ms #define num 32 static uint capture_array[num]; uint new_value = 0; uint old_value=0; uint value_diff=0; long sum; char flag; void Clock_Init(); void Display_Init(); void Timer_Init(); void display(); void main() { WDTCTL = WDTPW + WDTHOLD; Clock_Init(); Display_Init(); Timer_Init(); _EINT(); while(1) { if(flag) { flag=0; display(); } } } void Clock_Init() { uchar i; BCSCTL1&=~XT2OFF; do { IFG1&=~OFIFG; for(i=0xff; i>0; i--); } while((IFG1 & OFIFG)); BCSCTL2 |= SELM_2 + SELS + DIVS_3; } void Display_Init() { LCD_Init(); LCD_clear(); } void Timer_Init() { P1SEL |= BIT1; P2SEL |= BIT0; P2DIR |= BIT0; TACTL |= TASSEL_2 + MC_2; CCTL0 |= CM_3 + CCIS_0 + SCS + CAP + CCIE; } #pragma vector=TIMERA0_VECTOR __interrupt void Timer_A_ISR(void) { static uchar index=0; uchar i; //进入中断、标志位置位、表示有输入信号 new_value=TACCR0; //读取中断时的TACCR0值 value_diff=new_value-old_value ; //差异值=新值-旧值 capture_array[index]=value_diff; //将捕获的差异值存入数组 index++; if(index==num) { sum=0; flag=1; index=0; for(i=0;i<num;i++) sum+=capture_array[i]; //将捕获的Num个数据求和 sum >>= 5 ; //捕获的Num个数据求平均值 } old_value=new_value; //出中断后、新值变旧值、存旧值 } void display() { uchar q,w,e,r; q=sum/1000; w=sum/100%10; e=sum/10%10; r=sum%10; show_char(4,1,'0'+q); show_char(5,1,'0'+w); show_char(6,1,'0'+e); show_char(7,1,'0'+r); }