Hi.
I'm trying to develop a native app that uses 'wiringPi' using NDK.
However, an error occurs in the NDK that cannot find the wiringPi. Below is the screen.
When creating an NDK installer, I think it's because I didn't add a wiringPi library to the toolchain of NDK build.
How can i build the app using wiringPi
plz help me!
Thank you 
I did it!
I tried to cross-compile the library (libwiringPi.so, libwiringPiDev.so etc..), but it didn't work. So I took the library to my Ubuntu from the gpio component that I installed in webOS and made it link to 'cmake'.
but i have a problem.
It was definitely a code that was working well before, but when I woke up, I got an error message, "ERROR, cannot connect!" and the binary didn't work. Embedded is really hard. Can you tell me why?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-client.h>
#include <wayland-egl.h>
#include <wayland-webos-shell-client-protocol.h>
#include <EGL/egl.h>
#include <GLES2/gl2.h>
#include <wiringPi.h>
struct wl_display *g_pstDisplay = NULL;
struct wl_compositor *g_pstCompositor = NULL;
struct wl_surface *g_pstSurface = NULL;
struct wl_shell *g_pstShell = NULL;
struct wl_shell_surface *g_pstShellSurface = NULL;
struct wl_webos_shell *g_pstWebOSShell = NULL;
struct wl_webos_shell_surface *g_pstWebosShellSurface = NULL;
struct wl_egl_window *g_pstEglWindow = NULL;
EGLDisplay g_pstEglDisplay = NULL;
EGLConfig g_pstEglConfig = NULL;
EGLSurface g_pstEglSurface = NULL;
EGLContext g_pstEglContext = NULL;
static void finalize();
static void registryHandler(void *data, struct wl_registry *registry, uint32_t id, const char *interface, uint32_t version)
{
if (strcmp(interface, "wl_compositor") == 0)
{
g_pstCompositor = wl_registry_bind(registry, id, &wl_compositor_interface, 1);
}
else if (strcmp(interface, "wl_shell") == 0)
{
g_pstShell = wl_registry_bind(registry, id, &wl_shell_interface, 1);
}
else if (strcmp(interface, "wl_webos_shell") == 0)
{
g_pstWebOSShell = wl_registry_bind(registry, id, &wl_webos_shell_interface, 1);
}
}
static void registryRemover(void *data, struct wl_registry *registry, uint32_t id)
{
}
static const struct wl_registry_listener s_stRegistryListener = {
registryHandler,
registryRemover
};
static void webosShellHandleState(void *data, struct wl_webos_shell_surface *wl_webos_shell_surface, uint32_t state)
{
switch(state)
{
case WL_WEBOS_SHELL_SURFACE_STATE_FULLSCREEN:
break;
case WL_WEBOS_SHELL_SURFACE_STATE_MINIMIZED:
break;
}
}
static void webosShellHandlePosition(void *data, struct wl_webos_shell_surface *wl_webos_shell_surface, int32_t x, int32_t y)
{
}
static void webosShellHandleClose(void *data, struct wl_webos_shell_surface *wl_webos_shell_surface)
{
finalize();
exit(0);
}
static void webosShellHandleExpose(void *data, struct wl_webos_shell_surface *wl_webos_shell_surface, struct wl_array *rectangles)
{
}
static void webosShellHandleStateAboutToChange(void *data, struct wl_webos_shell_surface *wl_webos_shell_surface, uint32_t state)
{
}
static const struct wl_webos_shell_surface_listener s_pstWebosShellListener = {
webosShellHandleState,
webosShellHandlePosition,
webosShellHandleClose,
webosShellHandleExpose,
webosShellHandleStateAboutToChange
};
static void getWaylandServer()
{
struct wl_registry *pstRegistry = NULL;
g_pstDisplay = wl_display_connect(NULL);
if (g_pstDisplay == NULL)
{
fprintf(stderr, "ERROR, cannot connect!\n");
exit(1);
}
pstRegistry = wl_display_get_registry(g_pstDisplay);
wl_registry_add_listener(pstRegistry, &s_stRegistryListener, NULL);
wl_display_dispatch(g_pstDisplay);
// wait for a synchronous response
wl_display_roundtrip(g_pstDisplay);
if (g_pstCompositor == NULL || g_pstShell == NULL || g_pstWebOSShell == NULL)
{
fprintf(stderr, "ERROR, cannot find compositor / shell\n");
exit(1);
}
g_pstSurface = wl_compositor_create_surface(g_pstCompositor);
if (g_pstSurface == NULL)
{
fprintf(stderr, "ERROR, cannot create surface \n");
exit(1);
}
g_pstShellSurface = wl_shell_get_shell_surface(g_pstShell, g_pstSurface);
if (g_pstShellSurface == NULL)
{
fprintf(stderr, "Can't create shell surface\n");
exit(1);
}
wl_shell_surface_set_toplevel(g_pstShellSurface);
// Please see wayland-webos-shell-client-protocol.h file for webOS specific wayland protocol
g_pstWebosShellSurface = wl_webos_shell_get_shell_surface(g_pstWebOSShell, g_pstSurface);
if (g_pstWebosShellSurface == NULL)
{
fprintf(stderr, "Can't create webos shell surface\n");
exit(1);
}
wl_webos_shell_surface_add_listener(g_pstWebosShellSurface, &s_pstWebosShellListener, g_pstDisplay);
wl_webos_shell_surface_set_property(g_pstWebosShellSurface, "appId", (getenv("APP_ID") ? getenv("APP_ID") : "com.sample.waylandegl"));
// for secondary display, set the last parameter as 1
wl_webos_shell_surface_set_property(g_pstWebosShellSurface, "displayAffinity", (getenv("DISPLAY_ID") ? getenv("DISPLAY_ID") : "0"));
}
static void createWindow()
{
// webOS only supports full screen size
g_pstEglWindow = wl_egl_window_create(g_pstSurface, 1920, 1080);
if (g_pstEglWindow == EGL_NO_SURFACE)
{
fprintf(stderr, "ERROR, cannot create wayland egl window\n");
exit(1);
}
g_pstEglSurface = eglCreateWindowSurface(g_pstEglDisplay, g_pstEglConfig, g_pstEglWindow, NULL);
if (!eglMakeCurrent(g_pstEglDisplay, g_pstEglSurface, g_pstEglSurface, g_pstEglContext))
{
fprintf(stderr, "ERROR, cannot make current\n");
}
}
static void initEgl() {
EGLint major, minor, count, n, size;
EGLConfig *configs;
int i;
EGLint configAttributes[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE
};
static const EGLint contextAttributes[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
g_pstEglDisplay = eglGetDisplay((EGLNativeDisplayType) g_pstDisplay);
if (g_pstEglDisplay == EGL_NO_DISPLAY)
{
fprintf(stderr, "ERROR, cannot create create egl g_pstDisplay\n");
exit(1);
}
if (eglInitialize(g_pstEglDisplay, &major, &minor) != EGL_TRUE)
{
fprintf(stderr, "ERROR, cannot initialize egl g_pstDisplay\n");
exit(1);
}
eglGetConfigs(g_pstEglDisplay, NULL, 0, &count);
configs = (EGLConfig*)calloc(count, sizeof(EGLConfig));
eglChooseConfig(g_pstEglDisplay, configAttributes, configs, count, &n);
// simply choose the first config
g_pstEglConfig = configs[0];
g_pstEglContext = eglCreateContext(g_pstEglDisplay, g_pstEglConfig, EGL_NO_CONTEXT, contextAttributes);
}
static void finalize()
{
eglDestroyContext(g_pstEglDisplay, g_pstEglContext);
eglDestroySurface(g_pstEglDisplay, g_pstEglSurface);
eglTerminate(g_pstEglDisplay);
wl_display_disconnect(g_pstDisplay);
}
int main(int argc, char **argv)
{
getWaylandServer();
initEgl();
createWindow();
wiringPiSetup();
pinMode (0, OUTPUT);
for (;;)
{
digitalWrite (0, HIGH) ; delay (500) ;
digitalWrite (0, LOW) ; delay (500) ;
}
while (wl_display_dispatch_pending(g_pstDisplay) != -1)
{
glClearColor(1.0, 1.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
eglSwapBuffers(g_pstEglDisplay, g_pstEglSurface);
}
finalize();
exit(0);
}
below is a error screen!
Hi @SSo,
I'm not 100% sure,
but you need to type NDK environment setup command every time you open a new shell.
(The last step of NDK setup)
If it didn't work, please let me your process so I can re-produce your problem.
Thanks
