spi_m8.c~

键盘扫描程序

#include <mega8.h>

// SPI functions
#include <spi.h>
#include <mylib.h>
#include <mega8.h>
// Declare your global variables here

void main(void)
{
// Declare your local variables here
unsigned char i = 0;
unsigned char tem = 0;
// Input/Output Ports initialization
// Port B initialization
// Func7=In Func6=In Func5=Out Func4=In Func3=Out Func2=Out Func1=In Func0=In
// State7=T State6=T State5=0 State4=T State3=0 State2=0 State1=T State0=T
PORTB=0x00;
DDRB=0x2C;

// Port C initialization
// Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;

// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
TCCR0=0x00;
TCNT0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: Off
// USART Mode: Asynchronous
// USART Baud rate: 1200 (Double Speed Mode)
UCSRA=0x02;
UCSRB=0x90;
UCSRC=0x86;
UBRRH=0x03;
UBRRL=0x40;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
// Analog Comparator Output: Off
ACSR=0x80;
SFIOR=0x00;

// SPI initialization
// SPI Type: Master
// SPI Clock Rate: 500.000 kHz
// SPI Clock Phase: Cycle Half
// SPI Clock Polarity: Low
// SPI Data Order: MSB First
SPCR=0x51;
SPSR=0x00;
while (1)
      {
      // Place your code here
   for(i = 0;i < 0xff;i++)
     { 
     for(tem = 0;tem < 8;tem++)
       {
         PORTB.2 = 0;
         spi(i);
         PORTB.2 = 1;
         delay_1ms_8m(1);
       }
       }
      };
}