原创 Freescale NSS08Kit-R1驱动共阴数码管

NSS08Kit-R1开发板上有一个3位的共阴7段数码管，采用74hc595串行方式连接到mc9s08AC16上，引脚链接关系如下：

74hc595引脚                            MC9S08AC16引脚

PIN10                                       PIN32

PIN11                                       PIN31

PIN12                                       PIN28

PIN14                                       PIN27

原理图如下：

下面上程序，动态扫描方式

/*************************
@ Nicrosystem Freescale S08 DevKit(NSS08Kit-R1)
@ author:bluehacker<nicrosystem@gmail.com>
@ date:2009-04-06
**************************/
/***************
@说明：
本程序测试开发板上的3位7段数码管，数码管是共阴的
我们用单片机的定时器产生1秒间隔的节拍，每1秒我们更新下
7段数码管的显示，数码管显示自运行以来经历的时间（以秒计）
*****************/

#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */
#define HC595_SDI      PTDD_PTDD0
#define HC595_STCLK    PTDD_PTDD1
#define HC595_SHCLK    PTDD_PTDD2
#define HC595_RESET    PTDD_PTDD3
#define SEVENLED1      PTBD_PTBD3
#define SEVENLED2      PTBD_PTBD2
#define SEVENLED3      PTBD_PTBD1

unsigned int g_timeSecond;
volatile unsigned char g_timeOF;
//初始化定时器，每1秒中断一次
void init_tpm_timer()
{
    TPM1MODH=0x00;
    TPM1MODL=0x00;//set tpm1 as free running timer
    TPM1MODH=0x7A;
    TPM1MODL=0x12;
    TPM1SC=0x4f; //enable timer overflow interrupt
}

//设置系统时钟模式，为FEE,8MHZ的系统主频，BUS CLK为4MHZ
void init_system_clock()
{
     ICGC1=0xf8;
     ICGC2=0x89;
     while(ICGS1_LOCK==0);
}

interrupt VectorNumber_Vtpm1ovf  void tmp1_overflow_isr()
{
     g_timeOF=1;
     if(g_timeSecond>=1000)
        g_timeSecond=0;
     else
        g_timeSecond++;
     TPM1SC_TOF=0;
 
}
void init_7seg_port()
{
      PTDDD_PTDDD0=1;
      PTDDD_PTDDD1=1;
      PTDDD_PTDDD2=1;
      PTDDD_PTDDD3=1;
      PTBDD_PTBDD3=1;
      PTBDD_PTBDD1=1;
      PTBDD_PTBDD2=1;
      PTDDS_PTDDS0=1;
      PTDDS_PTDDS1=1;
      PTDDS_PTDDS2=1;
      PTDDS_PTDDS3=1;
      PTBDS_PTBDS0=1;
      PTBDS_PTBDS1=1;
      PTBDS_PTBDS2=1;
      HC595_RESET=1;
      HC595_RESET=0;
      HC595_RESET=1;
}

void write_74hc595(unsigned char dat)
{
  unsigned char i;
 
  HC595_STCLK=0;
  for(i=0;i<8;i++)
  {
    HC595_SHCLK=0;
    HC595_SDI=dat>>7;
    HC595_SHCLK=1;
    dat<<=1;
  }
  HC595_STCLK=1;
}

void display_7seg(unsigned char no,unsigned char dat)
{
    unsigned char code;
    unsigned char charmap[]=
    {
      0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7c,0x07,0x7f,0x67
    };
    code="charmap"[dat];
   
    switch(no)
    {
      case 1:
      write_74hc595(code);
      SEVENLED1=1;
      SEVENLED2=0;
      SEVENLED3=0;
      break;
     
      case 2:
      write_74hc595(code);
      SEVENLED2=1;
      SEVENLED1=0;
      SEVENLED3=0;
      break;
     
      case 3:
      write_74hc595(code);
      SEVENLED3=1;
      SEVENLED1=0;
      SEVENLED2=0;
      break;
     
      default:
       SEVENLED3=0;
       SEVENLED2=0;
       SEVENLED1=0;
       HC595_RESET=1;
       HC595_RESET=0;
       HC595_RESET=1;
       break;
    }
}

void main(void) {

  unsigned char i,buf[5];
  EnableInterrupts; /* enable interrupts */
  /* include your code here */
  SOPT_COPE=0;//disable cop watchdog
  g_timeSecond=0;
  g_timeOF=0;
  for(i=0;i<5;i++)
  {
    buf=0;
  }
  init_system_clock();
  init_tpm_timer();
  init_7seg_port();
 
  for(;;) {
    //__RESET_WATCHDOG(); /* feeds the dog */
    if(g_timeOF)
    {
      buf[0]=g_timeSecond/100;
      buf[1]=(g_timeSecond%100)/10;
      buf[2]=g_timeSecond%10;
      g_timeOF=0;
    }
    for(i=0;i<3;i++)
    {
       display_7seg(i+1,buf);
    }
  } /* loop forever */
  /* please make sure that you never leave main */
}