led.c.bak

键盘扫描 并通过LED 适时 显示

/*****************************************************
*  文件名称：
*           led1.h
*  文件说明:显示的时候首先设置要显示的内容
*           然后使能相应的LED
*
*****************************************************/
#ifndef _MSP430XF449H_
#include <msp430x44x.h>
#endif

#define LED_IN_USE 6
/*****************************************************/
/*   数据定义                                        */
/*****************************************************/
const unsigned char NUM_LED[17]=
                       {0xd7,0x14,0xcd,0x5d,0x1E,  // 0 ~ 4
                       0x5b,0xdb,0x15,0xdf,0x5f,   // 5 ~ 9
                       0x9f,0xda,0xc3,0xcc,0xcf,   // a ~ e
                       0x8b,0x00};                 //f,不显示

                       
unsigned char led_Buf[LED_IN_USE];  // LED显示缓冲区 ，
                                    // 存放要显示数据                         
unsigned char led_Ctrl;
/*******************************************************
*     模块初始化
*******************************************************/
void init_LED(void){
    char tmpv;
    P3DIR  = 0xff;    // set p3 output mode  
    P3OUT  = 0x00;    // set initial value 0
    P4DIR |= 0x03;    // set p4.0,p4.1 output mode 
    P4OUT &= 0xfc;    // set initial value 0
    led_Ctrl = 0;
    for(tmpv=0;tmpv<LED_IN_USE;tmpv++){  
      led_Buf[tmpv] = 0;
    }
    
}
/****************************************************
*     LED 显示  ,该函数可以放到定时器中断中
****************************************************/
void led_Display(){                   
    unsigned tmp ;
      
      tmp    = 0x01;
      P3OUT  = NUM_LED[led_Buf[led_Ctrl]];  // set what to be displayed
      P4OUT |= 0x02;                        // open data choose 
      P4OUT &= 0XFD;                        // close data choose
      P3OUT  = ~(tmp<<led_Ctrl);            // set which led is to be lit 
      P4OUT  |= 0x01;                       // open control choose
      P4OUT  &= 0XFE;                       // close control choose
      led_Ctrl= (led_Ctrl +1) % LED_IN_USE; // record which led to be lit
      
}