led.c

#include <wiringPi.h>
#include <stdio.h>

#define SCK 28
#define RCK 27
#define SI 29
int leddata(unsigned char pattern1,unsigned char pattern2){
	int x;
	unsigned char flg;
	flg = 0x01;
	for(x=0;x<8;x++){
		if((pattern2 & flg) == flg) write_bit(0);
		else write_bit(1);
		pattern2 = pattern2 >> 1;
	}
	flg = 0x80;
	for(x=0;x<8;x++){
		if((pattern1 & flg) == flg) write_bit(1);
		else write_bit(0);
		pattern1 = pattern1 << 1;
	}
	digitalWrite(SCK,0); digitalWrite(SCK,1); digitalWrite(SCK,0);
}
int write_bit(int i){
	digitalWrite(SI,i); digitalWrite(RCK,0); digitalWrite(RCK,1);
	return 0;
}
int main(void){
	unsigned char x,y;
	unsigned char data[8] = {0x3c,0x42,0xa5,0x81,0xa5,0x99,0x42,0x3c};
	int i;
	if(wiringPiSetup() == -1){
		printf("Error\n");
		return 1;
	}
	pinMode(SCK,OUTPUT); pinMode(RCK,OUTPUT); pinMode(SI,OUTPUT);
/*test pattern */
	printf("\nstart\n");
	for(y=1;y > 0;y=y << 1){
 		for(x=1;x > 0;x=x << 1){ leddata(x,y); usleep(30000); }
	}
	 for(i=0;i<2;i++){
		x=0;
		for(y=1;y > 0;y=y << 1){
			if(x>8)x=0;leddata(data[x++],y);	
		usleep(300000);
		}
	}
/*Nico chan*/
while(1){
	for(i=0;i<50000;i++){
		x=0;
		for(y=1;y > 0;y=y << 1){
			if(x>8)x=0;leddata(data[x++],y);	
		}
	}
}
return 0;
}