main.c~

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#include <string.h>

#include <wiringPiSPI.h>


#define SPI_CHANNEL 0

#define LED_NUM 23

	//output buffer
unsigned char output[LED_NUM*3];


//prototypes
void update();
void led_set(int id, char r, char g, char b);


int main(void){

	
	//init SPI
	if (wiringPiSPISetup (SPI_CHANNEL, 100000) < 0)
		printf("SPI Setup error\n");

	int i;	
	for(i=0;i<LED_NUM;i++){
		led_set(i,255,255,255);
	}
	
	for (i=0; i<10000;){	
		update();
		
	}	

}


void led_set(int id, char r, char g, char b){

	output[id*3 + 0] = r | 0x80;
	output[id*3 + 1] = g | 0x80;
	output[id*3 + 2] = b | 0x80;
}


void update(){


	unsigned char temp[LED_NUM*3];
	unsigned char latch[3] = {0,0,0};

	memcpy(temp,output, LED_NUM*3);
	
	wiringPiSPIDataRW (SPI_CHANNEL, temp, LED_NUM*3) ;
	wiringPiSPIDataRW (SPI_CHANNEL, latch, 3) ;
	usleep(1000);
}