1. Overview[edit | edit source]
This stage explains how to create, build and execute a simple C code application using the freshly installed SDK.
2. Code[edit | edit source]
- Create a directory that will host your source codes
mkdir $HOME/STM32MPU_workspace/STM32MP1-Ecosystem-v4.0.0/Developer-Package/stm32mp1-openstlinux-22.06.15 mkdir $HOME/STM32MPU_workspace/STM32MP1-Ecosystem-v4.0.0/Developer-Package/stm32mp1-openstlinux-22.06.15/sources
- Create a directory for your user space example
mkdir $HOME/STM32MPU_workspace/STM32MP1-Ecosystem-v4.0.0/Developer-Package/stm32mp1-openstlinux-22.06.15/sources/gtk_hello_world_example cd $HOME/STM32MPU_workspace/STM32MP1-Ecosystem-v4.0.0/Developer-Package/stm32mp1-openstlinux-22.06.15/sources/gtk_hello_world_example
- Create the source code file for your user space example: gtk_hello_world.c
#include <gtk/gtk.h> static void print_hello (GtkWidget *widget, gpointer data) { g_print ("Hello World\n"); } static void activate (GtkApplication *app, gpointer user_data) { GtkWidget *window; GtkWidget *button; GtkWidget *button_box; window = gtk_application_window_new (app); gtk_window_set_title (GTK_WINDOW (window), "Window"); gtk_window_set_default_size (GTK_WINDOW (window), 200, 200); button_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL); gtk_container_add (GTK_CONTAINER (window), button_box); button = gtk_button_new_with_label ("Hello World"); g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL); g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window); gtk_container_add (GTK_CONTAINER (button_box), button); gtk_widget_show_all (window); } int main (int argc, char **argv) { GtkApplication *app; int status; app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE); g_signal_connect (app, "activate", G_CALLBACK (activate), NULL); status = g_application_run (G_APPLICATION (app), argc, argv); g_object_unref (app); return status; }
3. Build[edit | edit source]
- Create the makefile for your user space example: Makefile
PROG = gtk_hello_world SRCS = gtk_hello_world.c CLEANFILES = $(PROG) # Add / change option in CFLAGS and LDFLAGS CFLAGS += -Wall $(shell pkg-config --cflags gtk+-3.0) LDFLAGS += $(shell pkg-config --libs gtk+-3.0) all: $(PROG) $(PROG): $(SRCS) $(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS) clean: rm -f $(CLEANFILES) $(patsubst %.c,%.o, $(SRCS))
- Cross-compile the project
make
4. Deploy and execute[edit | edit source]
- Push this binary onto the board (Ethernet connection needed)
scp gtk_hello_world root@<board ip address>:/usr/local
- Execute your user space example by using the user "weston"
cd /usr/local/ su -l weston -c "/usr/local/gtk_hello_world"
- A GTK window is displayed
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- Click the "Hello world" button to close the window. Hello world is displayed on the console:
Hello world