Mercurial > co2meter / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/task_ds18b20.h	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,54 @@
+
+/**
+ * @file task_ds18b20.h
+ * @brief The FreeRTOS task to query the DS18B20 sensors on one or two
+ *        one-wire busses. Each bus must have only one sensor. That way
+ *        we don't need to care about the DS18B20 internal ROM address.
+ *        The task will update the DS18B20_State structure.
+ */
+
+#ifndef	_TASK_DS18B20_H
+#define	_TASK_DS18B20_H
+
+/*
+ * Error codes in this task
+ */
+#define	DS18B20_ERR_NONE		0			///< No errors
+#define DS18B20_ERR_NOSENSOR		1			///< No sensor detected
+#define	DS18B20_ERR_TOOMANY		2			///< Too many sensors
+#define	DS18B20_ERR_CRC			3			///< CRC read error
+#define	DS18B20_ERR_READ		4			///< Generic read error
+
+
+/**
+ * @brief Structure containing the variables for the DS18B20 task.
+ */
+typedef struct {
+    bool   bottle_valid;		///< Bottle sensor valid reading.
+    double bottle_temperature;		///< Current bottle temperature.
+    int    bottle_error;		///< Bottle error number.
+} DS18B20_State;
+
+
+
+/**
+ * @brief Request a new measurement
+ */
+void request_ds18b20(void);
+
+
+/**
+ * @brief Measurement ready state
+ * @return Returns true if the temperature measurements are ready
+ */
+bool ready_ds18b20(void);
+
+
+/**
+ * @brief The FreeRTOS task to update the DS18B20 temperature sensors on request.
+ */
+void task_ds18b20(void *);
+
+
+#endif
+