在pcDuino上通过TCP/IP Socket控制Linker LED

pcduino_3001984

很多用户对TCP/IP sockets 编程能否用于Arduio-ish C环境抱有疑问，答案是肯定的，与Arduino相比，也不需要再用其他WiFi Shield 或者Ethernet shield。

下面介绍的是如何通过socket通信实现pcDuino控制LED灯，10mm的绿色LED灯以及proto shield，接线图如下：

要在pcDuino上建立TCP/IP socket 服务器，从客服端接收信息执行连接。当收到字符"O"时，灯亮；当收到字符 "F"时，灯灭，收到其它指令时不作出反应。

首先需要先获取pcDuino API：http://www.github.com/pcduino/c_enviroment

程序代码：

tcpip_led_test

1. /*
   
2. * LED test program
   
3. * The LED will be controlled by TCP socket
   
4. * This program serves an example of TCP socket server
   
5. *
   
6. *The TCP socket code is adpoted from : http://www.thegeekstuff.com/2011/12/c-socket-programming/
   
7. *
   
8. * Please use linker kit LED module,and install it on D2 D3 V G postion
   
9. *
   
10. * Jingfeng Liu
    
11. *
    
12. * 5/4/2013
    
13. *
    
14. */
    
15. 
    
16. #include <sys/socket.h>
    
17. #include <netinet/in.h>
    
18. #include <arpa/inet.h>
    
19. #include
    
20. #include
    
21. #include
    
22. #include
    
23. #include
    
24. #include <sys/types.h>
    
25. #include
    
26. 
    
27. #include
    
28. 
    
29. int led_pin = 2;
    
30. 
    
31. int listenfd = 0, connfd = 0;
    
32. int n;
    
33. struct sockaddr_in serv_addr;
    
34. 
    
35. char sendBuff[1025];
    
36. time_t ticks;
    
37. 
    
38. void setup()
    
39. {
    
40. 
    
41. led_pin = 2;
    
42. 
    
43. pinMode(led_pin, OUTPUT);
    
44. 
    
45. listenfd = socket(AF_INET, SOCK_STREAM, 0);
    
46. memset(&serv_addr, '0', sizeof(serv_addr));
    
47. memset(sendBuff, '0', sizeof(sendBuff));
    
48. 
    
49. serv_addr.sin_family = AF_INET;
    
50. serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    
51. serv_addr.sin_port = htons(5000);
    
52. 
    
53. bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
    
54. 
    
55. listen(listenfd, 10);
    
56. 
    
57. connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);
    
58. 
    
59. }
    
60. 
    
61. void loop()
    
62. {
    
63. 
    
64. // ticks = time(NULL);
    
65. // snprintf(sendBuff, sizeof(sendBuff), "Jingfeng Liu%.24s\r\n", ctime(&ticks));
    
66. // write(connfd, sendBuff, strlen(sendBuff));
    
67. 
    
68. n = read(connfd, sendBuff, strlen(sendBuff) );
    
69. 
    
70. if(n>0)
    
71. {
    
72. if(sendBuff[0]=='O') digitalWrite(led_pin, HIGH); // set the LED on
    
73. if(sendBuff[0]=='F') digitalWrite(led_pin,LOW); // set the LED off
    
74. }
    
75. 
    
76. // close(connfd);
    
77. // sleep(1);
    
78. 
    
79. }

复制代码

源文件 tcpip_led_test可以在目录 c_enviroment/sample里下载

在c_enviroment/sample里修改Makefile加入新的源文件：

1. DIR=$(shell pwd)/../
   
2. 
   
3. INCS = -I.\
   
4. -I$(DIR) \
   
5. -I$(DIR)/hardware \
   
6. -I$(DIR)/hardware/arduino \
   
7. -I$(DIR)/hardware/arduino/cores \
   
8. -I$(DIR)/hardware/arduino/cores/arduino \
   
9. -I$(DIR)/hardware/arduino/variants \
   
10. -I$(DIR)/hardware/arduino/variants/sunxi \
    
11. -I$(DIR)/libraries \
    
12. -I$(DIR)/libraries/Serial \
    
13. -I$(DIR)/libraries/SPI \
    
14. -I$(DIR)/libraries/Wire \
    
15. -I$(DIR)/libraries/LiquidCrystal \
    
16. -I$(DIR)/libraries/PN532_SPI
    
17. 
    
18. LIBS=../libarduino.a
    
19. TARGET=../output/test
    
20. 
    
21. OBJS = <strong>tcpip_led_test</strong> io_test adc_test pwm_test spi_test adxl345_test serial_te
    
22. st liquidcrystal_i2c liquidcrystal_spi interrupt_test tone_test
    
23. OBJS += linker_led_test linker_potentiometer_test linker_tilt_test linker_light_
    
24. sensor_test linker_button_test
    
25. OBJS += linker_touch_sensor_test linker_magnetic_sensor_test linker_temperature_
    
26. sensor_test linker_joystick_test
    
27. OBJS += linker_rtc_test linker_sound_sensor_test linker_buzzer_test linker_hall_
    
28. sensor_test linker_led_bar_test linker_relay_test
    
29. OBJS += pn532_readAllMemoryBlocks pn532readMifareMemory pn532readMifareTargetID
    
30. pn532writeMifareMemory
    
31. 
    
32. all:
    
33. @mkdir -p $(TARGET)
    
34. for i in $(OBJS); do echo "$(CXX) $(INCS) $$i.c -o $(TARGET)/$$i $(LIBS)
    
35. "; done
    
36. @for i in $(OBJS); do $(CXX) $(INCS) $$i.c -o $(TARGET)/$$i $(LIBS); don
    
37. e
    
38. 
    
39. clean:
    
40. @for i in $(OBJS); do rm -f $(TARGET)/$$i; done

复制代码

编译，运行 ‘$make’

1. /c_enviroment/output/test$ ./tcpip_led_test

复制代码

在另外一台pc上安装 TCP/IP Client，向pcDuino上的服务器发送数据，TCP客服端如下图：

这样就可以通过TCP客服端发送字符指令来控制LED灯了

奋斗哥

pcDuino的模块好丰富啊！！！

pcduino_3001984

奋斗哥 发表于 2013-5-8 13:36
pcDuino的模块好丰富啊！！！

这个主要是socket协议的应用 模块扩展应用确实蛮多