m8demo.c

AVR系列被广泛应用的单片机MEGA8开发(原理图)及例程

//ICC-AVR application builder : 2003-11-10 10:04:46
// Target : M8
// Crystal: 7.3728Mhz
#include <iom8.h>
#include <macros.h>
#include "M8Demo.h"
#include"I2C.H"
#include "Eeprom.h"
#include "AT45DB021.h"
#include "Uart.h"
#include "assembly.h"
unsigned int  DelayTimer;
unsigned int  TimerCount;
unsigned int  TimerCountOld;
unsigned int  key_tick;
unsigned char key_state;
unsigned char key_value;
unsigned char  key_pressed;
unsigned char mode_state;

unsigned char *OutPutStr;
unsigned char  out_eeprom_data;
unsigned char  out_eeprom_addr=0;
unsigned char  in_eeprom_data;
unsigned char  in_eeprom_addr=0;
unsigned int   adc_value=0;
unsigned char  AT45DB021_data;
unsigned char  AT45DB021_addr=0;
unsigned char  Display_Position=0;

const char DataTab[16]=
	{0xc0,0xf9,0xa4,0xb0,0x99,0x92,
	  0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8E};


void Delay(unsigned int delay_time)
{
while(delay_time)
delay_time--;
}

void Delayms(unsigned int timers)
{
DelayTimer=0;
while(1)
{if(DelayTimer>timers)
return;
}
}

void port_init(void)
{
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x7F; //m103 output only
 DDRC  = 0x79;
 PORTD = 0xFF;
 DDRD  = 0xFC;
}

//TIMER0 initialisation - prescale:1024
// WGM: Normal
// desired value: 10mSec
// actual value: 10.000mSec (0.0%)
void timer0_init(void)
{
  TCCR0 = 0x00; //stop
 TCNT0 = 0x8D; //set count
 TCCR0 = 0x03; //start timer

}

#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
 TCNT0 = 0x8D; //reload counter value
 // TCNT0 = 0xA4; //reload counter value

  DelayTimer++;
  key_tick++;
    Display_Position++;
 if(Display_Position>=5)
 	Display_Position=1;

   switch(mode_state)
 	 	       	{
 	 	       	  case clock_mode: DisplayTimer(TimerCount);break;
 	 	                case out_eeprom_addr_modify_mode:
 	 	                case out_eeprom_data_modify_mode:
 	 	                case out_eeprom_read_mode:DisplayHexData(out_eeprom_addr,out_eeprom_data);break;
 	 	                case in_eeprom_addr_modify_mode:
 	 	                case in_eeprom_data_modify_mode:
 	 	                case in_eeprom_read_mode:DisplayHexData(in_eeprom_addr,in_eeprom_data);break;
 	 	                case adc_mode:DisplayData( adc_value);break;
 	 	                case AT45DB021_addr_modify_mode:
				  case AT45DB021_data_modify_mode:DisplayHexData(AT45DB021_addr,AT45DB021_data);break;
                              default :break;
 	 	       	}

}

//TIMER1 initialisation - prescale:256
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 1Sec
// actual value:  1.000Sec (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x8F; //setup
 TCNT1L = 0x80;
 OCR1AH = 0x70;
 OCR1AL = 0x80;
 OCR1BH = 0x70;
 OCR1BL = 0x80;
 ICR1H  = 0x70;
 ICR1L  = 0x80;
 TCCR1A = 0x00;
 TCCR1B = 0x04; //start Timer
}

#pragma interrupt_handler timer1_ovf_isr:9
void timer1_ovf_isr(void)
{
 //TIMER1 has overflowed
 TCNT1H = 0x8F; //reload counter high value
 TCNT1L = 0x80; //reload counter low value
  TimerCount++;
if(TimerCount==3600)
	TimerCount=0;
}


void spi_init(void)
{
 SPCR = 0x70; //setup SPI
 SPSR = 0x00; //setup SPI
}

//TWI initialisation
// bit rate:1
void twi_init(void)
{
 TWCR= 0X00; //disable twi
 TWBR= 0x01; //set bit rate
 TWSR= 0x00; //set prescale
 TWAR= 0x02; //set slave address
 TWCR= 0x44; //enable twi
}

void twi_Enable(void)
{
 TWCR= 0x44; //enable twi
}
void twi_Disable(void)
{
 TWCR= 0x00; //enable twi
}


//ADC initialisation
// Conversion time: 208uS
void adc_init(void)
{
 ADCSR = 0x00; //disable adc
 ADMUX = 0x00; //select adc input 0
 ACSR  = 0x00;
 ADCSR = 0xc8;
 }
void adc_Enable(void)
{
DDRC&=0xFE;
PORTC&=0xFE;
ADCSR = 0xC8;
 }
void adc_Disable(void)
{//DDRC|=0x01;
//PORTC|=0x01;
 ADCSR = 0x00;
 }
#pragma interrupt_handler adc_isr:15
void adc_isr(void)
{
 //conversion complete, read value (int) using...
  adc_value=ADCL;            //Read 8 low bits first (important)
  adc_value|=(int)ADCH << 8; //read 2 high bits and shift into top byte
  ADCSR = 0x00;
  ADCSR = 0xC8;

}

int ReadADC( unsigned char channel)
{
    int i;

    ADMUX = channel;                        // Select channel

    ADCSR |= 0x40;                          // Start conversion

    while (!(ADCSR & 0x10));                // Check if converstion is ready

    ADCSR |= 0x10;                          // Clear Conversion ready flag by setting the bit

    i = ADCL;                               // Read 8 low bits first (important)
    i += (int)ADCH << 8;                    // Read 2 high bits and multiply with 256

    return i;
}

//call this routine to initialise all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 timer0_init();
 timer1_init();
// spi_init();
// twi_init();
 uart0_init();
// adc_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x05; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialised
}


void DisplayHexData(unsigned char timerH,unsigned char timerL)

{
unsigned char  temptimer1,temptimer2,temptimer3,temptimer4;
  		temptimer1=timerL%16;
  		temptimer2=timerL/16;
		temptimer3=timerH%16;
  		temptimer4=timerH/16;

Display_Data_LED(temptimer1,temptimer2,temptimer3,temptimer4);

}

void DisplayData(unsigned int timer)
{

unsigned char  temptimer1,temptimer2,temptimer3,temptimer4;
temptimer4=timer/1000;
timer=timer%1000;
temptimer3=timer/100;
timer=timer%100;
temptimer2=timer/10;
 temptimer1=timer%10;
Display_Data_LED(temptimer1,temptimer2,temptimer3,temptimer4);
}

void Display_Data_LED(unsigned char  Data1, unsigned char  Data2,unsigned char  Data3,unsigned char  Data4)

{unsigned char  displaydata,displaydata_2;

switch(Display_Position)
{

case 1:  displaydata=DataTab[Data1];
             displaydata_2=DataTab[Data1]&0xc0;
  			              PORTD=0x3B|displaydata_2;
 					PORTB=displaydata;
  			             break;
  case 2:displaydata=DataTab[Data2];
    		displaydata_2=DataTab[Data2]&0xc0;

  			  	  	PORTD=0x37|displaydata_2;
                            	PORTB=displaydata;
  			             break;
case 3:  	displaydata=DataTab[Data3];
  		displaydata_2=DataTab[Data3]&0xc0;
  			   	  	PORTD=0x2F|displaydata_2;
 					PORTB=displaydata;
  			             break;
case 4:	displaydata=DataTab[Data4];
  		displaydata_2=DataTab[Data4]&0xc0;
  			   	      	PORTD=0x1F|displaydata_2;
 	                        	 PORTB=displaydata;
  			             break;
  			    default:
  			             break;
  			
  			}

}
void DisplayTimer(unsigned int timer)
{
unsigned char  temptimer1,temptimer2,temptimer3,temptimer4;
temptimer1=timer%60;
temptimer3=timer/60;
temptimer2=temptimer1/10;
temptimer1=temptimer1%10;
temptimer4=temptimer3/10;
temptimer3=temptimer3%10;
Display_Data_LED(temptimer1,temptimer2,temptimer3,temptimer4);

}

unsigned char  Key_Decode(void)
{   Delay(10);

      DDRC&=0x79;
      PORTC|=0x30;
      PORTC&=0x59;
      Delay(10);
      if (!(PINC & 0x02))
      { return key_inc;}
      if (!(PINC & 0x04))
    {return key_enter;}
      PORTC|=0x30;
	PORTC&=0x69;
    	Delay(10);
       if (!(PINC & 0x02))
       {return key_dec;}
        if (!(PINC & 0x04))
	 {return key_mode;}
      return key_no;

}
void Key_Task(void)
{

switch(key_state)
{
    case KBD_IDLE:
    		{
    		key_value=key_no;
	    	key_pressed=false;
	    	key_value=Key_Decode();
	      if(key_value!=key_no)
	      	{
      			key_state = KBD_DEBOUNCE;