Added GrovePi demo program which uses the light sensor, button, lcd a…

…nd led addons.

server/i2c/grovepi/Demo.cpp

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2015 Niek Linnenbank
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <FreeNOS/Config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+    int greenLed = open("/dev/groveDigi4", O_WRONLY);
+    int button   = open("/dev/groveDigi3", O_RDONLY);
+    int light    = open("/dev/groveAnalog0", O_RDONLY);
+    int lcd      = open("/dev/groveLCD", O_WRONLY);
+    char buf[32], text[32];
+
+    if (greenLed < 0 || button < 0 || light < 0 || lcd < 0)
+    {
+        printf("%s: failed to open GrovePi devices: %s\n",
+                argv[0], strerror(errno));
+        return EXIT_FAILURE;
+    }
+
+    while (1)
+    {
+        // Reset fds
+        lseek(button, 0, SEEK_SET);
+        lseek(greenLed, 0, SEEK_SET);
+        lseek(light, 0, SEEK_SET);
+        lseek(lcd, 0, SEEK_SET);
+
+        // Copy button value to the green LED
+        read(button, buf, sizeof(buf));
+        write(greenLed, buf, 1);
+
+        // Display light status on the LCD
+        read(light, buf, sizeof(buf));
+        snprintf(text, sizeof(text), "light: %s\nFreeNOS %s",
+                 buf, VERSION);
+        write(lcd, text, sizeof(text));
+
+        // Sleep a bit
+        sleep(1);
+    }
+
+    return EXIT_SUCCESS;
+}

server/i2c/grovepi/SConscript

@@ -22,4 +22,5 @@ env = build_env.Clone()
 if env['SYSTEM'] == 'raspberry':
     env.UseServers(['log', 'filesystem', 'core'])
     env.UseLibraries([ 'libposix', 'liballoc', 'libstd', 'libarch', 'libexec', 'libi2c' ])
-    env.TargetProgram('server', [ Glob('*.cpp') ])
+    env.TargetProgram('server', [ 'AnalogPort.cpp', 'DigitalPort.cpp', 'Main.cpp', 'LCDBar.cpp' ])
+    env.TargetProgram('demo', [ 'Demo.cpp' ])