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

复制代码

     安装python3   

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

复制代码

     其他工具

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

复制代码

       编译器等组件

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

复制代码

        默认使用python3

1. sudo apt install python-is-python3

复制代码

        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

复制代码

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。

2 W3 k- ~& s0 C& y   然后就学着官方文档的样子去验证下SDK是否安装成功
1 N. x! E  j* d2 A. \2 B2 k# x9 m: Y   
) f3 x! `1 T# B9 n. G

  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>
   
2. 
   
3. static void
   , }. U2 v; E6 r0 I6 a/ T
4. print_hello (GtkWidget *widget,
   
5. gpointer data)
   ! l) v. s) T" I. |2 A+ f
6. {
   
7. g_print ("Hello World\n");
   
8. }
   , c& f5 m7 x# l& {+ I
9. 
   
10. static void
    , X" D7 j% Y$ R6 O; |! r/ I
11. activate (GtkApplication *app,
    
12. gpointer user_data)
    # ?) g% y4 [! z) m
13. {
    # }" V) w3 \; ?1 `- k- d8 N
14. GtkWidget *window;
    
15. GtkWidget *button;
    4 W' U& `! I2 A$ p4 h# y. l2 I0 p. |
16. GtkWidget *button_box;
    
17. 
    
18. window = gtk_application_window_new (app);
    
19. gtk_window_set_title (GTK_WINDOW (window), "Window");
    % \4 O( O& N( k* N2 K
20. gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
    , }0 ^$ J7 F: n7 G- v; _
21. 
    # `7 d, `- e; |2 w
22. button_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
    ( X6 a' f9 I: [8 h- E$ ?
23. gtk_container_add (GTK_CONTAINER (window), button_box);
    
24. 
    
25. button = gtk_button_new_with_label ("Hello World");
    
26. g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
    
27. g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
    ) K7 w+ p/ W( B( w) k4 ]% ?
28. gtk_container_add (GTK_CONTAINER (button_box), button);
    : l. w& x, D+ \2 c
29. 
    ' C8 T  x8 X0 _. V) P- f- b* W: z
30. gtk_widget_show_all (window);
    
31. }
    6 z; Q- Z' N" F) j7 T9 u
32. 
    " j0 p& c# c( C' Z1 G" i/ k
33. int
    " ^1 [' f9 l% I
34. main (int argc,
      N) ?: ?1 r  D( R, L" [9 O0 {
35. char **argv)
    
36. {
    
37. GtkApplication *app;
    
38. int status;
    ! f+ Y7 L/ y+ r
39. 
    3 h3 @' Y: S& ?3 F. M5 t& \8 P$ d. v
40. app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
    
41. g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
    & z( g" k, G& [6 N. H
42. status = g_application_run (G_APPLICATION (app), argc, argv);
    : h7 t! n! t/ o8 L/ n4 y
43. g_object_unref (app);
    % j" r9 U4 Q# L+ O
44. 
    
45. return status;
    
46. }
    " Y9 C0 g: ~: y- [; m7 O

复制代码

    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。  

1. PROG = gtk_hello_world
   
2. SRCS = gtk_hello_world.c
   ) b, {( a. R3 _) L$ S: c2 R8 g4 I
3. 
   
4. CLEANFILES = $(PROG)
   ) g5 c( F1 ]3 a  L0 G& U
5. 
   
6. # Add / change option in CFLAGS and LDFLAGS
   - f6 E2 _9 X' ~7 a$ d+ ]6 w
7. CFLAGS += -Wall $(shell pkg-config --cflags gtk+-3.0)
   9 @  ^* ~0 ?" P. s& [
8. LDFLAGS += $(shell pkg-config --libs gtk+-3.0)
   9 m1 b$ y. J0 B
9. 
   
10. all: $(PROG)
    * X2 r3 v3 x4 k' N: @
11. 
    9 I3 X' d% r# O$ y* g
12. $(PROG): $(SRCS)
    
13. $(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
    
14. 
    / L  [) U8 K' t( M- m; Y
15. clean:
    0 S8 Y) W! ], c& h
16. rm -f $(CLEANFILES) $(patsubst %.c,%.o, $(SRCS))
    

复制代码

  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。
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 p; s" i6 R5 h% M
7 C2 c7 X  o9 ]6 {- L5 T. U

1. #include <gtk/gtk.h>
   
2. #include <stdio.h>
   
3. #include <string.h>
   ; g3 j7 N( j: V9 X) q0 K5 J
4. 
   9 ^4 {. t* e) m3 N; J. P, I& r' A, L
5. char buf[50] = "";
   
6. 
   : d5 Z. J& K) T+ V: ^) x% A
7. void calc(GtkButton *button, gpointer data)
   
8. {
   
9. const char *text = gtk_button_get_label(button);
   
10. 
    % N* ?9 `8 w2 D, G$ P8 }0 b( Y
11. //退个操作
    
12. if (0 == strcmp(text, "c"))
    1 b: [% F5 ?; i3 t, b& d/ L
13. {
    
14. buf[strlen(buf) - 1] = 0;
    ; t9 \- I8 p* P( x! C
15. }else{
    
16. 
    
17. int a = 0, b = 0;
    $ Z4 T) h2 F# n, n0 D9 O
18. char c;
    # b. e9 K# j( E( @: s; S
19. strcat(buf,text);
    
20. 
    1 z8 P8 J( r5 a+ c' |4 A& B
21. if (0 == strcmp("=", text)) {
    
22. 
    4 O$ f0 x8 Q3 P, T9 g
23. sscanf(buf, "%d%c%d", &a, &c, &b);
    
24. 
    
25. if ('+' == c) {
    
26. sprintf(buf,"%d", a+b);
    
27. }
    % a( @, {( W3 T, O" F
28. else if ('-' == c) {
    
29. sprintf(buf, "%d", a-b);
    
30. }
    
31. else if ('*' == c) {
    
32. sprintf(buf, "%d", a*b);
    
33. }
    
34. else if ('/' == c) {
    / p: q; m0 c) a* i6 U# J: B
35. sprintf(buf, "%d", a/b);
    ! q! j7 V0 b% C2 ^
36. }
    1 j& R# W2 X( J# ?* |. n. ]
37. 
    
38. }
    
39. }
    
40. 
    
41. gtk_entry_set_text(GTK_ENTRY(data), buf);
    / p- u4 d8 h( f8 @  i3 W/ Z
42. 
    ( k5 _& G: L2 e; O: a# O
43. return;
    ' t* q# m1 C: l7 d5 O
44. }
    
45. 
    
46. int main(int argc,char *argv[])
    
47. {
    : M- z" B, {" u1 k* T5 k& h
48. 
    
49. gtk_init(&argc, &argv);
    
50. 
    
51. 
    
52. GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    
53. gtk_window_set_title (GTK_WINDOW (window), "calc");
    9 N/ V* [7 i7 N  Z/ B
54. 
    
55. //创建一个表格容器5行4列
    
56. GtkWidget *table = gtk_table_new(5,4,TRUE);
    
57. 
    0 E0 O, _. Y. b5 i, p8 O0 u3 v
58. gtk_container_add(GTK_CONTAINER(window), table);
    4 L) B8 f% u. O1 H0 d& z3 B
59. 
    4 o/ ?2 n; j$ K- g! Q1 v; N0 e
60. //创建一个行编辑
    3 |3 f# D1 Y% w5 c9 ]5 [6 [0 q: P
61. GtkWidget *entry = gtk_entry_new();
    ) e6 ^1 S# h9 T+ R% {
62. 
    8 F* |0 I4 z' }  |
63. gtk_entry_set_text(GTK_ENTRY(entry), "0");
    
64. 
    & W4 O& h; t# B
65. gtk_editable_set_editable(GTK_EDITABLE(entry), FALSE);
    " R4 H- `% b6 b4 g1 W; q3 z
66. 
    
67. //创建多个按钮
    % H; m5 d" c" f& q, ^8 N! y
68. GtkWidget *button0 = gtk_button_new_with_label("0");
    6 F: g, ~$ ]- g
69. GtkWidget *button1 = gtk_button_new_with_label("1");
    4 c! s( U% U! ^" O* C
70. GtkWidget *button2 = gtk_button_new_with_label("2");
    : ~8 F& c# n% d" F( s( [! r
71. GtkWidget *button3 = gtk_button_new_with_label("3");
    2 v' v  O% N7 A0 N7 Q+ Q
72. GtkWidget *button4 = gtk_button_new_with_label("4");
    
73. GtkWidget *button5 = gtk_button_new_with_label("5");
    $ A$ U0 z# t7 w: C- m( A
74. GtkWidget *button6 = gtk_button_new_with_label("6");
    
75. GtkWidget *button7 = gtk_button_new_with_label("7");
    
76. GtkWidget *button8 = gtk_button_new_with_label("8");
    . g! Z8 Y( e8 z+ s: k
77. GtkWidget *button9 = gtk_button_new_with_label("9");
    
78. 
    " H. D& F2 S6 @
79. GtkWidget *button_add = gtk_button_new_with_label("+");
    ) z# N( y$ c/ k6 e4 z; V, d5 \
80. GtkWidget *button_minus = gtk_button_new_with_label("-");
    " M+ o- x# ?  b/ Q& ]
81. GtkWidget *button_mul = gtk_button_new_with_label("*");
    
82. GtkWidget *button_div = gtk_button_new_with_label("/");
    : Y3 `' i. _. \( T! Z4 n! M
83. GtkWidget *button_equal = gtk_button_new_with_label("=");
    7 N" C- ?% V) Y0 d
84. GtkWidget *button_delete = gtk_button_new_with_label("c");
    ( z3 s$ V5 M  s8 W- \* I
85. 
    
86. 
    1 b  T1 u8 G. ^+ h5 A& a1 c; Y9 ~
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);
    ' \& z6 G; K) n- W7 f8 I
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);
    
94. gtk_table_attach_defaults(GTK_TABLE(table), button5, 1, 2, 2, 3);
      ^$ n) E) N+ Z  P
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);
    + `2 n1 @' O; O6 d" ?: n
98. gtk_table_attach_defaults(GTK_TABLE(table), button9, 2, 3, 1, 2);
    9 |( u* i- y% ?+ Z+ W
99. 
    / i4 g' x. `$ y' m  z* c. s
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);
     
102. gtk_table_attach_defaults(GTK_TABLE(table), button_mul , 3, 4, 2, 3);
     3 G  H+ I3 p: T: Q
103. gtk_table_attach_defaults(GTK_TABLE(table), button_div, 3, 4, 3, 4);
     6 f" m+ P7 M, `5 R4 V1 Z
104. gtk_table_attach_defaults(GTK_TABLE(table), button_equal, 3, 4, 4, 5);
     : k5 G' v+ l/ v3 y, x# {6 O: f
105. gtk_table_attach_defaults(GTK_TABLE(table), button_delete, 3, 4, 1, 2);
     
106. 
     
107. //注册信号函数，calc()
     
108. g_signal_connect(button0, "pressed", G_CALLBACK(calc), entry);
     1 v% L! v! `, A
109. g_signal_connect(button1, "pressed", G_CALLBACK(calc), entry);
     0 |1 D/ q8 a' v+ q% J
110. g_signal_connect(button2, "pressed", G_CALLBACK(calc), entry);
     & p( N4 y: S  t$ i
111. g_signal_connect(button3, "pressed", G_CALLBACK(calc), entry);
     7 p) W% n! N6 c6 ?& j/ r  s5 b- ]3 _
112. g_signal_connect(button4, "pressed", G_CALLBACK(calc), entry);
     
113. g_signal_connect(button5, "pressed", G_CALLBACK(calc), entry);
     " I5 i! x* e! o7 e4 Y
114. g_signal_connect(button6, "pressed", G_CALLBACK(calc), entry);
     
115. g_signal_connect(button7, "pressed", G_CALLBACK(calc), entry);
     7 B. V! h6 Q" m) \8 d7 C' h
116. g_signal_connect(button8, "pressed", G_CALLBACK(calc), entry);
     - D6 v2 w/ O2 C, D
117. g_signal_connect(button9, "pressed", G_CALLBACK(calc), entry);
     - R+ \( }( j% F: X# J0 y
118. 
     - `7 @8 s# t0 v6 O2 e5 j; S; j
119. g_signal_connect(button_add, "pressed", G_CALLBACK(calc), entry);
     & U8 g) n: F4 p: e5 ?
120. g_signal_connect(button_mul, "pressed", G_CALLBACK(calc), entry);
     4 a7 R- j" ?5 e( q% S8 g) j
121. g_signal_connect(button_div, "pressed", G_CALLBACK(calc), entry);
     
122. g_signal_connect(button_minus, "pressed", G_CALLBACK(calc), entry);
     $ V1 z* |- Z2 j5 @! p7 k
123. g_signal_connect(button_equal, "pressed", G_CALLBACK(calc), entry);
     
124. g_signal_connect(button_delete, "pressed", G_CALLBACK(calc), entry);
     - Q9 J" M. m2 y! d" d
125. 
     
126. 
     
127. gtk_widget_show_all(window);
     
128. 
     % `6 K4 a2 E9 C: K
129. //主事件循环
     
130. gtk_main();
     
131. 
     
132. return 0;
     
133. }
     ; s1 b: V% t- |2 D6 W2 b/ z

复制代码

    以上程序，编译运行后，就可以有以下得效果  
' d3 F  @$ x8 U" G; y5 E
7 m( B6 ?7 K' G  \" X1 S

  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
% M/ V2 E0 N( F4 O