原创 AVR mega48 电动车电子里程仪

/*******************************************************************************************/
/* instrument         :motor instrument 2008.3.10             */
/* Designer           :Li Xiang Feng            */
/* Chip               :MEG48+two 74hc595+five Digital control(show distance)      */
/*                    +nine led(show speed)+ five led (show voltage)+Transistor      */
/* Crystal            :meg48  8.0000Mhz                     */
/* Digital control    :pc0-pc4 is control ports,QH~QA of 74hc595(u1) is date ports     */
/* nine led           :pd0 QH~QA of 74hc595(u1) and pd0  is  9 bits date port      */
/* five led           :pd3~pd7 control bits
/* 74hc595(u1)control :Serial Port is mosi ,Clock port is sck,latch port control is pb2    */
/* 74hc595(u1)control :Serial Port is mosi ,Clock port is sck,latch port control is pd0    */
/* speed impluse input:Transistor,Anti-admission, PSA,then input int0(pd2);        */
/* voltage sampleinput :adc5(pd5)                       */

/* instrumentboard    :48 input board "DP";which is  sourse Indicator;speed impluse     */ 

/*                    input"SP";right Indicator input is "DR";right Indicator input is     */   

/*                    "DR"; BIG light Indicator  input is"DD";("XXO" is their output port) */
/*******************************************************************************************/
#include <iom48v.h>
#include <macros.h>
#include <eeprom.h>
#define address 0x6f      
#define uchar unsigned char
unsigned long speed,speed1;//Variables counts speed and shows speed
unsigned long count;       //Variables counts distance
unsigned long distance;    //Variables shows distance
unsigned char voltage;    //Variables shows voltage
unsigned char eep_flag;   //flag of write diatance to eeprom
unsigned char num[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //0-9
unsigned char num_p[] = {0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10}; //0.-9.
unsigned char show_flagc=0; 
unsigned char show_flagd=0;    
void Delay(unsigned int num)//delay times
{    
 while( num-- ) WDR();
   
}       
void spi_send(uchar dd)
    {
      SPDR="dd";
      while(0==(SPSR&0X80));
   SPSR&=0X7f;
   WDR ();
    }

void eeprom_write(unsigned long i )//eeprom write
{
 EEPROM_WRITE(address,i);
  WDR();
  SEI();
}
unsigned long eeprom_read()
{
unsigned long i;

EEPROM_READ(address,i);          //eepromread
WDR();
return i;
 }

//external interupt on INT0
#pragma interrupt_handler int0_isr:iv_INT0
void int0_isr(void)
{
speed++;
if(count<=2089)//0.1KM Refreshs 改变2989数值可以改变里程数
  {count++; eep_flag=0;
 }
 else
 {
 count=0;eep_flag=1;
 distance++; //Digital control show add
 }
}

//TIMER1 initialize - prescale:256
// WGM: 0) Normal, TOP="0xFFFF"
// desired value: 1Hz
// actual value:  1.000Hz (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x85; //setup
 TCNT1L = 0xEE;
 OCR1AH = 0x7A;
 OCR1AL = 0x12;
 OCR1BH = 0x7A;
 OCR1BL = 0x12;
 ICR1H  = 0x7A;
 ICR1L  = 0x12;
 TCCR1A = 0x00;
 TCCR1B = 0x04; //start Timer
}
#pragma interrupt_handler timer1_ovf_isr:iv_TIM1_OVF
void timer1_ovf_isr(void)
{
           //TIMER1 has overflowed
 TCNT1H = 0x85; //reload counter high value
 TCNT1L = 0xEE; //reload counter low value
 speed1=speed;
 speed=0;
 }
 
//port initialize
void port_init(void)
{
 DDRB=0xff;
 PORTB=0X00;
 DDRC=0x5f;
 PORTC=0Xff;
 PORTD = 0xff;
 DDRD  = 0xFB;
}

//Watchdog initialize
// prescale: 2K
void watchdog_init(void)
{
 WDR (); //this prevents a timeout on enabling
 WDTCSR |= (1<<WDCE) | (1<<WDE); // 30-Oct-2006 Umesh 
 WDTCSR = 0x08; //WATCHDOG ENABLED - dont forget to issue WDRs
}

//spi initialize
void spi_init(void)
{
 SPCR = 0x53; //setup SPI
 SPSR = 0x00; //setup SPI
}

//ADC initialize
// Conversion time: 416uS
void adc_init(void)
{
 ADCSRA = 0x00; //disable adc
 ADMUX = 0xE5;  //select adc input 0
 ACSR  = 0x80;
 ADCSRB = 0x00;
}

void init_devices(void)
{
 CLI();
 port_init();
 spi_init();
 watchdog_init();
 adc_init();
 timer1_init();
 MCUCR = 0x00;
 EICRA = 0x03; //extended ext ints
 EIMSK = 0x01;
 
 TIMSK0 = 0x00; //timer 0 interrupt sources
 TIMSK1 = 0x01; //timer 1 interrupt sources
 TIMSK2 = 0x00; //timer 2 interrupt sources
 
 PCMSK0 = 0x00; //pin change mask 0
 PCMSK1 = 0x00; //pin change mask 1
 PCMSK2 = 0x00; //pin change mask 2
 PCICR = 0x00; //pin change enable
 PRR = 0x00; //power controller
 SEI(); //re-enable interrupts
 }

 //five Digital control refeshes
void dig_refresh(void)
{
  unsigned char a,b,c,d,e;
  unsigned long i,j,k,l,m;
  i="distance"%10;
  j="distance"%100;
  k="distance"%1000;
  l="distance"%10000;
  m="distance"%100000;//date change
  a="i";
  b=(j-a)/10;
  c=(k-j)/100;
  d=(l-k)/1000;
  e=(m-l)/10000;
   if((e==0)&&(d==0)&&(c==0))
 show_flagc=1;
 else show_flagc=0;
if((e==0)&&(d==0))
show_flagd=1;
else show_flagd=0;
 //show digtal control
    spi_send(num[a]);//refreshes 1 bit
    PORTB&=0Xfb;
 PORTB|=0X04;
 PORTC|=0X01;
 PORTC&=0X01;
 if(show_flagc==1)
 Delay(4400);
 else if (show_flagd==1)
 Delay(3500);
 else if(e==0)
 Delay(2800);
 else
 Delay(2285);
 PORTC=0X00;

 //condition write eeprom
 if(eep_flag=1)
  {
    eeprom_write(distance);
  }
 
 spi_send(num_p);//refreshes 2 bit
    PORTB&=0Xfb;
 PORTB|=0X04;
 PORTC|=0X02;
 PORTC&=0X02;
 if(show_flagc==1)
 Delay(4400);
 else if (show_flagd==1)
 Delay(3500);
 else if(e==0)
 Delay(2800);
 else
 Delay(2285);//调节数码管亮度，改小则变暗
 PORTC=0X00;
 
 if(show_flagc==0)
 {
 spi_send(num[c]);//refreshes 3 bit
    PORTB&=0Xfb;
 PORTB|=0X04;
 PORTC|=0X04;
 PORTC&=0X04;
 if(show_flagc==1)
 Delay(4400);
 else if (show_flagd==1)
 Delay(3500);
 else if(e==0)
 Delay(2800);
 else
 Delay(2285);
 PORTC=0X00;
 }
 
 if(show_flagd==0)
 {
 spi_send(num[d]);//refreshes 4 bit
    PORTB&=0Xfb;
 PORTB|=0X04;
 PORTC|=0X08;
 PORTC&=0X08;
 if(show_flagc==1)
 Delay(4400);
 else if (show_flagd==1)
 Delay(3500);
 else if(e==0)
 Delay(2800);
 else
 Delay(2285);
 PORTC=0X00;
 }
 if(e!=0)
 {
 spi_send(num[e]);////refreshes 5 bit
    PORTB&=0Xfb;
 PORTB|=0X04;
 PORTC|=0X10;
 PORTC&=0X10;
 if(show_flagc==1)
 Delay(4400);
 else if (show_flagd==1)
 Delay(3500);
 else if(e==0)
 Delay(2800);
 else
 Delay(2285);
 PORTC=0X00;
 }
}
//  speed shows
void speed_show(void)//速度区间段，改变区间值可以调节速度,改小显示速度快
{
    if(speed1>173)          {PORTD|=0X02;spi_send(0Xff);}  //all light
    else if(speed1>=153)    {PORTD&=0X02;spi_send(0X7F);} 
    else if(speed1>=128)    {PORTD&=0X02;spi_send(0X3F);}
    else if(speed1>=106)    {PORTD&=0X02;spi_send(0X1F);}
    else if(speed1>=81)     {PORTD&=0X02;spi_send(0X0F);}
    else if(speed1>=58)     {PORTD&=0X02;spi_send(0X07);}
    else if(speed1>=36)     {PORTD&=0X02;spi_send(0X03);}
    else if(speed1>=13)     {PORTD&=0X02;spi_send(0X01);}
    else                    {PORTD&=0X02;spi_send(0X00);} //the last light
    PORTD&=0XfE;PORTD|=0X01;
}