apps/ltr308: add simple application to test ltr308 sensor

Signed-off-by: Robert-Ionut Alexa <robertalexa2000@gmail.com>

examples/ltr308/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_LTR308
+	tristate "LTR308 ambient light sensor example"
+	default n
+	depends on SENSORS_LTR308
+	---help---
+		Enable the LTR308 example
+
+if EXAMPLES_LTR308
+
+config EXAMPLES_LTR308_PROGNAME
+	string "Program name"
+	default "ltr308"
+	---help---
+		This is the name of the program that will be used when the NSH ELF
+		program is installed.
+
+config EXAMPLES_LTR308_PRIORITY
+	int "LTR308 task priority"
+	default 100
+
+config EXAMPLES_LTR308_STACKSIZE
+	int "LTR308 stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

examples/ltr308/Make.defs

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+############################################################################
+# apps/examples/ltr308/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_LTR308),)
+CONFIGURED_APPS += $(APPDIR)/examples/ltr308
+endif

examples/ltr308/Makefile

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+############################################################################
+# apps/examples/ltr308/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# LTR308 ambient light sensor example built-in application info
+
+PROGNAME = $(CONFIG_EXAMPLES_LTR308_PROGNAME)
+PRIORITY = $(CONFIG_EXAMPLES_LTR308_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_LTR308_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_LTR308)
+
+# LTR308 ambient light sensor example
+
+MAINSRC = ltr308_main.c
+
+include $(APPDIR)/Application.mk

examples/ltr308/ltr308_main.c

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+/****************************************************************************
+ * apps/examples/ltr308/ltr308_main.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/sensors/ioctl.h>
+#include <nuttx/sensors/sensor.h>
+#include <nuttx/sensors/ltr308.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <poll.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * ltr308_main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  struct ltr308_calibval calibval;
+  struct sensor_light light;
+  struct pollfd pfd;
+  int ret;
+  int fd;
+
+  fd = open("/dev/uorb/sensor_light0", O_RDONLY);
+  if (fd < 0)
+    {
+      perror("Could not open file");
+      return fd;
+    }
+
+  calibval.integration_time = 1;
+  calibval.measurement_rate = 2;
+  calibval.gain = 1;
+  ret = ioctl(fd, SNIOC_CALIBRATE, &calibval);
+  if (ret < 0)
+    {
+      perror("Could not calibrate sensor");
+      goto err_out;
+    }
+
+  memset(&pfd, 0, sizeof(struct pollfd));
+  pfd.fd = fd;
+  pfd.events = POLLIN;
+  ret = poll(&pfd, 1, -1);
+  if (ret < 0)
+    {
+      perror("Could not poll sensor");
+      goto err_out;
+    }
+
+  ret = read(fd, &light, sizeof(struct sensor_light));
+  if (ret < 0)
+    {
+      perror("Could not read from sensor");
+      goto err_out;
+    }
+
+  printf("timestamp: %llu, lux: %f\n", light.timestamp, light.light);
+  return OK;
+
+err_out:
+  close(fd);
+  return ret;
+}