add TronSens HTM-B71 humidity sensor

conf/messages.xml

@@ -754,8 +754,13 @@
     <field name="values" type="uint8[]" unit="none"/>
   </message>
 
+  <message name="HTM_STATUS" id="115">
+    <field name="ihumid" type="uint16"/>
+    <field name="itemp"  type="uint16"/>
+    <field name="humid"  type="float" unit="rel_hum" format="%.2f"/>
+    <field name="temp"   type="float" unit="deg_celsius" format="%.2f"/>
+  </message>
 
- <!--115 is free -->
  <!--116 is free -->
  <!--117 is free -->
  <!--118 is free -->

conf/modules/humid_htm_b71.xml

@@ -0,0 +1,19 @@
+<!DOCTYPE module SYSTEM "module.dtd">
+
+<!--
+     TronSens HTM-B71 humidity sensor (I2C)
+     @param HTM_I2C_DEV i2c device (default i2c0)
+     -->
+
+<module name="humid_htm_b71" dir="meteo">
+  <header>
+    <file name="humid_htm_b71.h"/>
+  </header>
+  <init fun="humid_htm_init()"/>
+  <periodic fun="humid_htm_start()" freq="4" delay="10"/>
+  <periodic fun="humid_htm_read()"  freq="4" delay="14"/>
+  <event fun="humid_htm_event()"/>
+  <makefile target="ap">
+    <file name="humid_htm_b71.c"/>
+  </makefile>
+</module>

sw/airborne/modules/meteo/humid_htm_b71.c

@@ -0,0 +1,107 @@
+/*
+ * $Id$
+ *
+ * Copyright (C) 2011 Martin Mueller <martinmm@pfump.org>
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi 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 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi 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 paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+/** \file humid_htm_b71.c
+ *  \brief TronSens HTM-B71 humidity/temperature sensor i2c interface
+ *
+ */
+
+/* nice sensor but not very collaborative with others on the i2c bus */
+
+
+#include "modules/meteo/humid_htm_b71.h"
+
+#include "sys_time.h"
+#include "mcu_periph/i2c.h"
+#include "mcu_periph/uart.h"
+#include "messages.h"
+#include "downlink.h"
+
+#ifndef DOWNLINK_DEVICE
+#define DOWNLINK_DEVICE DOWNLINK_AP_DEVICE
+#endif
+
+#ifndef HTM_I2C_DEV
+#define HTM_I2C_DEV i2c0
+#endif
+
+#define HTM_SLAVE_ADDR 0x28
+
+struct i2c_transaction htm_trans;
+uint8_t htm_status;
+uint16_t humidhtm, temphtm;
+float fhumidhtm, ftemphtm;
+
+
+void humid_htm_init(void) {
+  htm_status = HTM_IDLE;
+}
+
+void humid_htm_start( void ) {
+  if (cpu_time_sec > 1) {
+    /* measurement request: wake up sensor, sample temperature/humidity */
+    I2CTransmit(HTM_I2C_DEV, htm_trans, HTM_SLAVE_ADDR, 0);
+    htm_status = HTM_MR;
+  }
+}
+
+/* needs 18.5ms delay from measurement request */
+void humid_htm_read( void ) {
+  if (htm_status == HTM_MR_OK) {
+    /* read humid and temp*/
+    htm_status = HTM_READ_DATA;
+    I2CReceive(HTM_I2C_DEV, htm_trans, HTM_SLAVE_ADDR, 4);
+  }
+}
+
+void humid_htm_event( void ) {
+  if (htm_trans.status == I2CTransSuccess) {
+    switch (htm_status) {
+
+    case HTM_MR:
+      htm_status = HTM_MR_OK;
+      htm_trans.status = I2CTransDone;
+      break;
+
+    case HTM_READ_DATA:
+      /* check stale status */
+      if (((htm_trans.buf[0] >> 6) & 0x3) == 0) {
+        /* humidity */
+        humidhtm = ((htm_trans.buf[0] & 0x3F) << 8) | htm_trans.buf[1];
+        fhumidhtm = humidhtm / 163.83;
+        /* temperature */
+        temphtm = (htm_trans.buf[2] << 6) | (htm_trans.buf[3] >> 2);
+        ftemphtm = -40.00 + 0.01 * temphtm;
+        DOWNLINK_SEND_HTM_STATUS(DefaultChannel, &humidhtm, &temphtm, &fhumidhtm, &ftemphtm);
+      }
+      htm_trans.status = I2CTransDone;
+      break;
+
+    default:
+      htm_trans.status = I2CTransDone;
+      break;
+    }
+  }
+}
+

sw/airborne/modules/meteo/humid_htm_b71.h

@@ -0,0 +1,19 @@
+#ifndef HUMID_HTM_H
+#define HUMID_HTM_H
+
+#include "std.h"
+
+enum htm_type {
+  HTM_IDLE,
+  HTM_MR,
+  HTM_MR_OK,
+  HTM_READ_DATA
+};
+
+void humid_htm_init(void);
+void humid_htm_start(void);
+void humid_htm_read(void);
+void humid_htm_event(void);
+
+#endif // HUMID_HTM_H
+