main._c

ATMEGA128的SPI驱动程序

/************************************************
文件：main.c
用途：
注意：内部8M晶振
创建：2008.4.1
修改：2008.4.1
Copy Right  (c)  www.avrvi.com  AVR与虚拟仪器
************************************************/

#include "config.h"
volatile unsigned int countnum=0; 

void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x8F; //setup
 TCNT1L = 0x81;
 OCR1AH = 0x70;
 OCR1AL = 0x7F;
 OCR1BH = 0x70;
 OCR1BL = 0x7F;
 OCR1CH = 0x70;
 OCR1CL = 0x7F;
 ICR1H  = 0x70;
 ICR1L  = 0x7F;
 TCCR1A = 0x00;
 TCCR1B = 0x04; //start Timer
}

#pragma interrupt_handler timer1_ovf_isr:15
void timer1_ovf_isr(void)
{
 TCNT1H = 0x8F; //reload counter high value
 TCNT1L = 0x81; //reload counter low value
 countnum++;
 if(countnum>9999) countnum=0;
}

void init_devices(void)
{
 CLI(); //disable all interrupts
 timer1_init();
 TIMSK = 0x04; //timer interrupt sources
 SEI(); //re-enable interrupts
}

void main(void)
{
 init_devices(); 
 HC_595_init();
 while(1)
 	{
		 //Seg7_Led_display(countnum);
		 Seg7_Led_float(25.13);
	}
}