我是看着胡老师的文档做的，现在也懒得写了。把文档放在这了http://pan.baidu.com/s/1c07D02k，胡老师写的文档真是太详细了

下面只贴一下代码吧，也没有注释。

led.h

#define LED_A 29
#define LED_B 27
#define LED_C 24
#define LED_D 22
#define LED_E 21
#define LED_F 28
#define LED_G 25
#define LED_H 23
#define LED_COM1 0
#define LED_COM2 2
#define LED_COM3 3
#define LED_COM4 12

#define LED_D1 LED_E
#define LED_D2 LED_D
#define LED_D3 LED_H
#define LED_D4 LED_C
#define LED_D5 30
#define LED_D6 31
#define LED_D7 11
#define LED_D8 10

int tube_segment[]={LED_A, LED_B, LED_C, LED_D, LED_E, LED_F, LED_G, LED_H};
int number_segments[]={0b11111100, 0b01100000, 0b11011010, 0b11110010, 0b01100110, 0b10110110, 0b10111110,0b11100000, 0b11111110, 0b11100110};
int tube_coms[]={LED_COM1, LED_COM2, LED_COM3, LED_COM4};

int led_segment[]={LED_D1, LED_D2, LED_D3, LED_D4, LED_D5, LED_D6, LED_D7, LED_D8};
void init_raspberrypi_gpios(void);
void display_number_in_tube(int number, int tube_number);

led.c

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

int main()
{
	int i, current_number=0;
	wiringPiSetup();
	init_raspberrypi_gpios();
	while(1){
		// for (i = 0; i < 4; ++i)
		{
			display_number_in_tube(current_number, 0);
			display_number_in_tube(current_number, 1);
			display_number_in_tube(current_number, 2);
			display_number_in_tube(current_number, 3);
			current_number++;
			if(current_number==10){
				current_number=0;
			}
			delay(500);
		}
	}
	return 0;
}

void init_raspberrypi_gpios(void){
	int i, count =8;
	for (i = 0; i < count; ++i)
	{
		pinMode(tube_segment[i], OUTPUT);
		digitalWrite(tube_segment[i], HIGH);
	}

	count = 4;
	for (i = 0; i < count; ++i)
	{
		pinMode(tube_coms[i], OUTPUT);
		digitalWrite(tube_coms[i], HIGH);
	}
}

void display_number_in_tube(int number, int tube_number){
	int i;
	int b_number = number_segments[number];
	for (i = 0; i < 8; ++i)
	{
		if(b_number&0x80){
			digitalWrite(tube_segment[i], LOW);
		}else{
			digitalWrite(tube_segment[i], HIGH);
		}
		b_number<<=1;
	}

	// for (i = 0; i < 4; ++i)
	// {
	// 	digitalWrite(tube_coms[i], HIGH);
	// }

	if (tube_number < 4)
	{
		digitalWrite(tube_coms[tube_number], LOW);
		/* code */
	}else{
		printf("%s\n", "tube number error!");
	}
}

然后用WinScp传到树莓派上，在终端用如下命令编译、运行。

gcc -Wall -o led led.c -lwiringPi

sudo ./led