+#include "log.h"
+#include <math.h>
+
+/**
+ * Read a data value from a sensor; block until value is read
+ * @param sensor_id - The ID of the sensor
+ * @returns The current value of the sensor
+ */
+DataPoint GetData(int sensor_id)
+{
+ // switch based on the sensor_id at the moment for testing;
+ // might be able to just directly access ADC from sensor_id?
+ //TODO: Implement for real sensors
+
+ DataPoint d;
+ //TODO: Deal with time stamps properly
+ static int count = 0;
+ d.time = count++;
+ switch (sensor_id)
+ {
+ case SENSOR_TEST0:
+ d.value = count;
+ break;
+ case SENSOR_TEST1:
+ d.value = (float)(rand() % 100) / 100;
+ break;
+ default:
+ Fatal("Unknown sensor id: %d", sensor_id);
+ break;
+ }
+ usleep(100000); // simulate delay in sensor polling
+ return d;
+}
+
+
+/**
+ * Destroy a sensor
+ * @param s - Sensor to destroy
+ */
+void Destroy(Sensor * s)
+{
+ // Maybe move the binary file into long term file storage?
+ fclose(s->file);
+}
+
+
+
+/**
+ * Initialise a sensor
+ * @param s - Sensor to initialise
+ */
+void Sensor_Init(Sensor * s, int id)
+{
+ s->write_index = 0;
+ s->read_offset = 0;
+ s->id = id;
+
+ #define FILENAMESIZE BUFSIZ
+ char filename[FILENAMESIZE];
+ //if (s->id >= pow(10, FILENAMESIZE))
+ if (false)
+ {
+ Fatal("Too many sensors! FILENAMESIZE is %d; increase it and recompile.", FILENAMESIZE);
+ }
+
+ pthread_mutex_init(&(s->mutex), NULL);
+
+ sprintf(filename, "%d", s->id);
+ unlink(filename); //TODO: Move old files somewhere
+
+ s->file = fopen(filename, "a+b"); // open binary file
+ Log(LOGDEBUG, "Initialised sensor %d; binary file is \"%s\"", id, filename);
+}
+