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。
/ i( p6 ~7 i) D) t
   然后就学着官方文档的样子去验证下SDK是否安装成功
   
2 T4 ?) R7 q1 t2 w

  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
     e1 t1 M. Z$ }0 R0 m# Y2 D7 N
4. print_hello (GtkWidget *widget,
   
5. gpointer data)
   
6. {
   
7. g_print ("Hello World\n");
   6 W% N9 J5 D  l" _: Q1 @- m
8. }
   
9. 
   
10. static void
    0 o& l" {2 }. X: z$ S4 R5 u( T: ~
11. activate (GtkApplication *app,
    
12. gpointer user_data)
    & \3 a8 Z- |" E7 N9 n" i# h+ ?5 c6 l# t
13. {
    
14. GtkWidget *window;
    : c: t) `' s4 \7 y" M% l% u# z
15. GtkWidget *button;
    1 u: q+ ]% p6 E' a+ B8 m
16. GtkWidget *button_box;
    1 N" \8 u8 Y3 ]+ h' d
17. 
    * o% E/ L8 K- D! I$ ]( k
18. window = gtk_application_window_new (app);
    % D# a, e; m! Y/ z' l7 j  ]
19. gtk_window_set_title (GTK_WINDOW (window), "Window");
    ! S8 L4 J1 s% {9 x2 P
20. gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
    
21. 
    ( C. [4 m6 C: |* v3 E* Q6 Z
22. button_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
    ! W) j/ }) o; r# c
23. gtk_container_add (GTK_CONTAINER (window), button_box);
    + k$ {% H3 j9 ~, ]' c. i; V
24. 
    
25. button = gtk_button_new_with_label ("Hello World");
    3 i" K! h! h/ l( D, X4 \
26. g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
    
27. g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
    
28. gtk_container_add (GTK_CONTAINER (button_box), button);
    & {. {* s$ |6 N! W
29. 
    
30. gtk_widget_show_all (window);
    
31. }
    
32. 
    
33. int
    
34. main (int argc,
    / A& b. Q' t; Z( t. X4 a& p3 ]
35. char **argv)
    
36. {
    3 n+ e( ^5 g2 c% w1 M9 c* A' c
37. GtkApplication *app;
    4 |; H  z% v+ T4 o' [4 t9 y! j0 ^
38. int status;
    
39. 
    
40. app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
    $ h+ \0 H8 a2 H. Y% s% ]1 T
41. g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
    
42. status = g_application_run (G_APPLICATION (app), argc, argv);
    + l& H; x7 h" a8 H6 ^5 w9 u( F
43. g_object_unref (app);
    
44. 
    
45. return status;
    
46. }
    

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
   
3. 
   ; f6 V7 C5 p3 f; ^7 k6 p
4. CLEANFILES = $(PROG)
   " G# @' M3 z' Y: d* O
5. 
   6 C; L% _# q8 h% C( S- e. G7 ]
6. # Add / change option in CFLAGS and LDFLAGS
   6 d9 }4 ?+ ~: _3 e
7. CFLAGS += -Wall $(shell pkg-config --cflags gtk+-3.0)
   
8. LDFLAGS += $(shell pkg-config --libs gtk+-3.0)
   8 F: S, E/ F1 R
9. 
   : ~1 w, O* S/ y4 O  I1 @
10. all: $(PROG)
    
11. 
    
12. $(PROG): $(SRCS)
    
13. $(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
    2 c8 p8 U0 g# r: n$ V! d* ?
14. 
      i# ~; Z. n! R8 c! y
15. clean:
    
16. rm -f $(CLEANFILES) $(patsubst %.c,%.o, $(SRCS))
    7 L; W+ W4 Y2 `+ Y) ^

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。

, c8 l. J8 \* @5 W. e5 |
' |  ^7 o; J4 M2 l

1. #include <gtk/gtk.h>
   
2. #include <stdio.h>
   " U0 ]  C* f% T8 g  f+ w$ h
3. #include <string.h>
   
4. 
   
5. char buf[50] = "";
   
6. 
   
7. void calc(GtkButton *button, gpointer data)
   
8. {
   ' f) \3 q" ^2 ^( q4 p. G
9. const char *text = gtk_button_get_label(button);
   7 G! U! L0 L' |( P2 L5 S: u
10. 
    
11. //退个操作
    ( Q0 d3 F  p" N& T7 i/ L
12. if (0 == strcmp(text, "c"))
    1 h" [3 _7 r! _' g
13. {
    
14. buf[strlen(buf) - 1] = 0;
    ; [5 r# |" B% s, [6 Y0 }& L  h
15. }else{
    4 K  `8 I; f4 d4 R* ^# `
16. 
    ' S% V. f( M+ _6 ?( F
17. int a = 0, b = 0;
    
18. char c;
    
19. strcat(buf,text);
    
20. 
    
21. if (0 == strcmp("=", text)) {
    
22. 
    % ?; T* T8 A5 q: I, F- [. `
23. sscanf(buf, "%d%c%d", &a, &c, &b);
    
24. 
    
25. if ('+' == c) {
    
26. sprintf(buf,"%d", a+b);
      ?' i& L3 k$ D3 j/ C
27. }
    1 j( X; X% t( V/ g8 z3 N
28. else if ('-' == c) {
      T- }) _8 \6 p& c4 E" X
29. sprintf(buf, "%d", a-b);
    
30. }
    & W/ I3 s4 T* l
31. else if ('*' == c) {
    ' H7 J$ p1 q$ f2 ]8 p5 E
32. sprintf(buf, "%d", a*b);
    . U7 G: h3 x) e5 Z, o
33. }
    
34. else if ('/' == c) {
    # H% J2 p8 \/ r6 U
35. sprintf(buf, "%d", a/b);
    
36. }
    4 _1 ^; m+ }: c' b: ^- j! J7 m
37. 
    
38. }
    
39. }
    8 F0 V3 B1 a7 n. s4 x# n3 p3 A8 S$ i
40. 
    
41. gtk_entry_set_text(GTK_ENTRY(data), buf);
    ; ?( S5 T* }% n9 c. M4 [
42. 
    
43. return;
    $ T0 s/ j$ i2 W# s) U
44. }
    ! f/ U+ H3 ?. G; I
45. 
      W0 s: z8 ?0 W# p3 P. u
46. int main(int argc,char *argv[])
    ) a0 H  a6 w8 A& z: @& L9 |
47. {
    
48. 
    7 w1 C4 j* O3 _, q1 e7 \
49. gtk_init(&argc, &argv);
    
50. 
    + `9 ~  n2 p: g1 J% r4 G
51. 
    
52. GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    
53. gtk_window_set_title (GTK_WINDOW (window), "calc");
    
54. 
    9 }+ T1 f( h' w/ m; K
55. //创建一个表格容器5行4列
    6 \* p( Z8 B0 w' r3 C
56. GtkWidget *table = gtk_table_new(5,4,TRUE);
    
57. 
    + z9 H9 X# n0 u2 T$ `
58. gtk_container_add(GTK_CONTAINER(window), table);
    " O! _9 j) v/ d8 ^
59. 
    
60. //创建一个行编辑
    & B! o2 g( {+ D( c
61. GtkWidget *entry = gtk_entry_new();
    
62. 
    
63. gtk_entry_set_text(GTK_ENTRY(entry), "0");
    ' W/ b: m5 ^2 \
64. 
    
65. gtk_editable_set_editable(GTK_EDITABLE(entry), FALSE);
    . O; E2 d# ~5 j7 q! \" J/ p
66. 
    + V9 N5 r8 N7 V8 d. w
67. //创建多个按钮
    , Z- }+ `0 |4 u5 o4 \$ N- T
68. GtkWidget *button0 = gtk_button_new_with_label("0");
    
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");
    ) d3 _) C! N, h0 N# j, H
73. GtkWidget *button5 = gtk_button_new_with_label("5");
    
74. GtkWidget *button6 = gtk_button_new_with_label("6");
    5 S5 P9 B! ~7 `! @* J3 {# G
75. GtkWidget *button7 = gtk_button_new_with_label("7");
    
76. GtkWidget *button8 = gtk_button_new_with_label("8");
    
77. GtkWidget *button9 = gtk_button_new_with_label("9");
    
78. 
    ( ?4 h+ @4 U: E) A) j- a2 Y
79. GtkWidget *button_add = gtk_button_new_with_label("+");
    
80. GtkWidget *button_minus = gtk_button_new_with_label("-");
    7 L. |1 \5 a3 L
81. GtkWidget *button_mul = gtk_button_new_with_label("*");
    $ s3 L, N" T' E0 r( I! k
82. GtkWidget *button_div = gtk_button_new_with_label("/");
    
83. GtkWidget *button_equal = gtk_button_new_with_label("=");
    3 `0 G( D+ h* V, F. @
84. GtkWidget *button_delete = gtk_button_new_with_label("c");
    ; D0 s* W' O4 P7 T7 o6 v3 D( N
85. 
    # P& t. ^" s8 f
86. 
    & T. ^* `  [$ }
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);
    ' D2 C5 S$ q2 w* u- }# M2 Y" S& `
90. gtk_table_attach_defaults(GTK_TABLE(table), button1, 0, 1, 3, 4);
    ; W# \. u- m3 `" A8 e/ F! ]  t5 L
91. gtk_table_attach_defaults(GTK_TABLE(table), button2, 1, 2, 3, 4);
    6 {: a2 P6 Y- y4 n, O1 s+ V: R
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);
    
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);
    5 J) ?: X9 m( N/ b
99. 
    , Q1 E9 U( R7 v0 c
100. gtk_table_attach_defaults(GTK_TABLE(table), button_add, 1, 2, 4, 5);
     2 S$ N" \5 Q3 L& W  @
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);
     
103. gtk_table_attach_defaults(GTK_TABLE(table), button_div, 3, 4, 3, 4);
     3 R* y+ L/ W6 v; o% d
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. 
     
107. //注册信号函数，calc()
     0 ~! A1 T! [# E$ M( J* J
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);
     
111. g_signal_connect(button3, "pressed", G_CALLBACK(calc), entry);
     1 k3 r6 s/ A* K/ ?; N
112. g_signal_connect(button4, "pressed", G_CALLBACK(calc), entry);
     4 T0 D6 `+ {  A
113. g_signal_connect(button5, "pressed", G_CALLBACK(calc), entry);
     
114. g_signal_connect(button6, "pressed", G_CALLBACK(calc), entry);
       X" r. T4 g( z9 v7 m! q/ q
115. g_signal_connect(button7, "pressed", G_CALLBACK(calc), entry);
     
116. g_signal_connect(button8, "pressed", G_CALLBACK(calc), entry);
     0 ^# ~9 y6 N6 Q7 ]8 A- w% f
117. g_signal_connect(button9, "pressed", G_CALLBACK(calc), entry);
     
118. 
     2 Q8 m! v; Y/ f) u0 q2 |5 U
119. g_signal_connect(button_add, "pressed", G_CALLBACK(calc), entry);
     " |/ @& F3 B8 V$ H6 K
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);
     + W+ J  O1 Y2 _+ ^
123. g_signal_connect(button_equal, "pressed", G_CALLBACK(calc), entry);
     ( S$ ]. Y1 t% q% L- r. S; l
124. g_signal_connect(button_delete, "pressed", G_CALLBACK(calc), entry);
     
125. 
     
126. 
     
127. gtk_widget_show_all(window);
     & C" @- t: x; G9 x( y2 W6 }
128. 
     2 V" y/ \$ [1 B$ Z
129. //主事件循环
     / s8 y0 _* \, N0 U  `
130. gtk_main();
     3 q- p' ?7 I1 O3 v, V7 }
131. 
       o3 Y" o1 Q; l
132. return 0;
     
133. }
     5 }# P( t/ `) ]" i2 w

复制代码

    以上程序，编译运行后，就可以有以下得效果  

  i. \' n* l/ ]% x' p" ]

  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