上次已经开启了Linux系统，并且有GUI桌面，虽然不是比较熟悉的Qt环境，但也是可以做个小应用感受下stm32mp135系列产品的特点。

  首先要搭建开发环境，毫无疑问安装个SDK就行了，官方WiKi页面啥都有。

  基于Ubuntu18系统，补充安装所需要的库和小工具

  更新软件列表  

1. sudo apt-get update

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     安装python3   

1. sudo apt-get install gawk wget git diffstat unzip texinfo gcc-multilib chrpath socat cpio python3 python3-pip python3-pexpect

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     其他工具

1. sudo apt-get install libssl-dev libgmp-dev libmpc-dev lz4 zstd

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       编译器等组件

1. sudo apt-get install build-essential libncurses-dev libyaml-dev libssl-dev

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        默认使用python3

1. sudo apt install python-is-python3

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        其他有用的工具

1. sudo apt-get install coreutils bsdmainutils sed curl bc lrzsz corkscrew cvs subversion mercurial nfs-common nfs-kernel-server libarchive-zip-perl dos2unix texi2html libxml2-utils

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执行完以上内容，就可以下载和安装SDK软件包了。从以下地址获取最新的SDK

   https://www.st.com/en/embedded-software/stm32mp1dev.html#get-software   我还是在windows下面下载的，然后拷贝到了虚拟机使用。使用tar xvf 解压该压缩包。chmod +x 赋予可执行权限。然后运行安装就行了，默认的目录是/opt/st/stm32mp1/，，这个路径就可以，直接继续安装。

   然后就学着官方文档的样子去验证下SDK是否安装成功
   
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  以上就完成了编译环境，至于说开发环境，一般还得有个IDE或者其他编辑器加调试工具。这里打算做的小程序使用gedit就行。

  首先拷贝官方给的demo程序，基于GTK得hello world。

  

1. #include <gtk/gtk.h>
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2. 
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3. static void
   
4. print_hello (GtkWidget *widget,
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5. gpointer data)
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6. {
   
7. g_print ("Hello World\n");
   
8. }
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9. 
   
10. static void
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11. activate (GtkApplication *app,
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12. gpointer user_data)
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13. {
    
14. GtkWidget *window;
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15. GtkWidget *button;
    
16. GtkWidget *button_box;
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17. 
    
18. window = gtk_application_window_new (app);
    
19. gtk_window_set_title (GTK_WINDOW (window), "Window");
    
20. gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
    
21. 
    
22. button_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
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23. gtk_container_add (GTK_CONTAINER (window), button_box);
    
24. 
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25. button = gtk_button_new_with_label ("Hello World");
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26. g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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27. g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
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28. gtk_container_add (GTK_CONTAINER (button_box), button);
    
29. 
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30. gtk_widget_show_all (window);
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31. }
    
32. 
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33. int
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34. main (int argc,
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35. char **argv)
    
36. {
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37. GtkApplication *app;
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38. int status;
    
39. 
    
40. app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
    
41. g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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42. status = g_application_run (G_APPLICATION (app), argc, argv);
    
43. g_object_unref (app);
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44. 
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45. return status;
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46. }
    

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    然后也复制一个makefile文件，其实单个文件，直接使用gcc命令也可以得。  
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1. PROG = gtk_hello_world
   
2. SRCS = gtk_hello_world.c
   
3. 
   
4. CLEANFILES = $(PROG)
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5. 
   
6. # Add / change option in CFLAGS and LDFLAGS
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7. CFLAGS += -Wall $(shell pkg-config --cflags gtk+-3.0)
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8. LDFLAGS += $(shell pkg-config --libs gtk+-3.0)
   
9. 
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10. all: $(PROG)
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11. 
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12. $(PROG): $(SRCS)
    
13. $(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
    
14. 
    
15. clean:
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16. rm -f $(CLEANFILES) $(patsubst %.c,%.o, $(SRCS))
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  然后make，scp到开发板执行程序，就可以看到一个hello world窗口出现在之前得桌面上了。
: G/ [9 `1 o' M# o 接下来改程序，说实话没用过gtk，不过看了下helloworld得程序可以看懂，所以也百度了一下，就基本做出来了。

1. #include <gtk/gtk.h>
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2. #include <stdio.h>
   
3. #include <string.h>
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4. 
   
5. char buf[50] = "";
   
6. 
   
7. void calc(GtkButton *button, gpointer data)
   
8. {
   
9. const char *text = gtk_button_get_label(button);
   
10. 
    
11. //退个操作
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12. if (0 == strcmp(text, "c"))
    
13. {
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14. buf[strlen(buf) - 1] = 0;
    
15. }else{
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16. 
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17. int a = 0, b = 0;
    
18. char c;
    
19. strcat(buf,text);
    
20. 
    
21. if (0 == strcmp("=", text)) {
    
22. 
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23. sscanf(buf, "%d%c%d", &a, &c, &b);
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24. 
    
25. if ('+' == c) {
    
26. sprintf(buf,"%d", a+b);
    
27. }
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28. else if ('-' == c) {
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29. sprintf(buf, "%d", a-b);
    
30. }
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31. else if ('*' == c) {
    
32. sprintf(buf, "%d", a*b);
    
33. }
    
34. else if ('/' == c) {
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35. sprintf(buf, "%d", a/b);
    
36. }
    
37. 
    
38. }
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39. }
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40. 
    
41. gtk_entry_set_text(GTK_ENTRY(data), buf);
    
42. 
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43. return;
    
44. }
    
45. 
    
46. int main(int argc,char *argv[])
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47. {
    
48. 
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49. gtk_init(&argc, &argv);
    
50. 
    
51. 
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52. GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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53. gtk_window_set_title (GTK_WINDOW (window), "calc");
    
54. 
    
55. //创建一个表格容器5行4列
    
56. GtkWidget *table = gtk_table_new(5,4,TRUE);
    
57. 
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58. gtk_container_add(GTK_CONTAINER(window), table);
    
59. 
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60. //创建一个行编辑
    
61. GtkWidget *entry = gtk_entry_new();
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62. 
    
63. gtk_entry_set_text(GTK_ENTRY(entry), "0");
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64. 
    
65. gtk_editable_set_editable(GTK_EDITABLE(entry), FALSE);
    
66. 
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67. //创建多个按钮
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68. GtkWidget *button0 = gtk_button_new_with_label("0");
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69. GtkWidget *button1 = gtk_button_new_with_label("1");
    
70. GtkWidget *button2 = gtk_button_new_with_label("2");
    
71. GtkWidget *button3 = gtk_button_new_with_label("3");
    
72. GtkWidget *button4 = gtk_button_new_with_label("4");
    
73. GtkWidget *button5 = gtk_button_new_with_label("5");
    
74. GtkWidget *button6 = gtk_button_new_with_label("6");
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75. GtkWidget *button7 = gtk_button_new_with_label("7");
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76. GtkWidget *button8 = gtk_button_new_with_label("8");
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77. GtkWidget *button9 = gtk_button_new_with_label("9");
    
78. 
    
79. GtkWidget *button_add = gtk_button_new_with_label("+");
    
80. GtkWidget *button_minus = gtk_button_new_with_label("-");
    
81. GtkWidget *button_mul = gtk_button_new_with_label("*");
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82. GtkWidget *button_div = gtk_button_new_with_label("/");
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83. GtkWidget *button_equal = gtk_button_new_with_label("=");
    
84. GtkWidget *button_delete = gtk_button_new_with_label("c");
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85. 
    
86. 
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87. gtk_table_attach_defaults(GTK_TABLE(table), entry, 0, 4, 0, 1);
    
88. 
    
89. gtk_table_attach_defaults(GTK_TABLE(table), button0, 0, 1, 4, 5);
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90. gtk_table_attach_defaults(GTK_TABLE(table), button1, 0, 1, 3, 4);
    
91. gtk_table_attach_defaults(GTK_TABLE(table), button2, 1, 2, 3, 4);
    
92. gtk_table_attach_defaults(GTK_TABLE(table), button3, 2, 3, 3, 4);
    
93. gtk_table_attach_defaults(GTK_TABLE(table), button4, 0, 1, 2, 3);
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94. gtk_table_attach_defaults(GTK_TABLE(table), button5, 1, 2, 2, 3);
    
95. gtk_table_attach_defaults(GTK_TABLE(table), button6, 2, 3, 2, 3);
    
96. gtk_table_attach_defaults(GTK_TABLE(table), button7, 0, 1, 1, 2);
    
97. gtk_table_attach_defaults(GTK_TABLE(table), button8, 1, 2, 1, 2);
    
98. gtk_table_attach_defaults(GTK_TABLE(table), button9, 2, 3, 1, 2);
    
99. 
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100. gtk_table_attach_defaults(GTK_TABLE(table), button_add, 1, 2, 4, 5);
     
101. gtk_table_attach_defaults(GTK_TABLE(table), button_minus, 2, 3, 4, 5);
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102. gtk_table_attach_defaults(GTK_TABLE(table), button_mul , 3, 4, 2, 3);
     
103. gtk_table_attach_defaults(GTK_TABLE(table), button_div, 3, 4, 3, 4);
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104. gtk_table_attach_defaults(GTK_TABLE(table), button_equal, 3, 4, 4, 5);
     
105. gtk_table_attach_defaults(GTK_TABLE(table), button_delete, 3, 4, 1, 2);
     
106. 
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107. //注册信号函数，calc()
     
108. g_signal_connect(button0, "pressed", G_CALLBACK(calc), entry);
     
109. g_signal_connect(button1, "pressed", G_CALLBACK(calc), entry);
     
110. g_signal_connect(button2, "pressed", G_CALLBACK(calc), entry);
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111. g_signal_connect(button3, "pressed", G_CALLBACK(calc), entry);
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112. g_signal_connect(button4, "pressed", G_CALLBACK(calc), entry);
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113. g_signal_connect(button5, "pressed", G_CALLBACK(calc), entry);
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114. g_signal_connect(button6, "pressed", G_CALLBACK(calc), entry);
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115. g_signal_connect(button7, "pressed", G_CALLBACK(calc), entry);
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116. g_signal_connect(button8, "pressed", G_CALLBACK(calc), entry);
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117. g_signal_connect(button9, "pressed", G_CALLBACK(calc), entry);
     
118. 
     
119. g_signal_connect(button_add, "pressed", G_CALLBACK(calc), entry);
     
120. g_signal_connect(button_mul, "pressed", G_CALLBACK(calc), entry);
     
121. g_signal_connect(button_div, "pressed", G_CALLBACK(calc), entry);
     
122. g_signal_connect(button_minus, "pressed", G_CALLBACK(calc), entry);
     
123. g_signal_connect(button_equal, "pressed", G_CALLBACK(calc), entry);
     
124. g_signal_connect(button_delete, "pressed", G_CALLBACK(calc), entry);
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125. 
     
126. 
     
127. gtk_widget_show_all(window);
     
128. 
     
129. //主事件循环
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130. gtk_main();
     
131. 
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132. return 0;
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133. }
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    以上程序，编译运行后，就可以有以下得效果  

  操作和UI都是比较简单得，就不演示过程了，系统得触摸驱动也是做好的，gtk只管做应用就好了。操作也算流畅，毕竟也没涉及到复杂的图表渲染。

   搞到这里，发现其实不复杂得GUI程序用这套现成的框架倒也是挺方便。Linux系统下其实资源很丰富，软件开发方式也很多选择，所以不多做逗留了。这款开发板还有一大特点就是可以按照以往STM32单片机得方式进行使用，所以后面感受下1GHz的单片机开发方式。

可以搞个演示视频