Added a quick sht11 sensor driver support for Z1

Support for Sensirion SHT1x/SHT7x support is adapted from core for Z1 in the Ziglet port.
XXX TODO:
 + Remove SHT11_PWR
 + Lines are shared with I2C, hence port reconfiguration must be added at the driver level.

examples/z1/Makefile

@@ -2,8 +2,8 @@ ifndef TARGET
 TARGET=z1
 endif
 
-CONTIKI_PROJECT = test-phidgets blink test-adxl345 tmp102-test test-battery #test-potent
+CONTIKI_PROJECT = test-phidgets blink test-adxl345 tmp102-test test-battery test-sht11 #test-potent
-CONTIKI_SOURCEFILES += cc2420-arch.c
+CONTIKI_SOURCEFILES += cc2420-arch.c sensors.c sht11.c
 PROJECT_SOURCEFILES = i2cmaster.c tmp102.c adxl345.c battery-sensor.c sky-sensors.c #potentiometer-sensor.c
 APPS=serial-shell
 

examples/z1/TODO

@@ -1 +1,2 @@
 + clean-up test-battery.c
++ sht11 drier compat. with i2c

examples/z1/test-sht11.c

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2011, Zolertia(TM) is a trademark of Advancare,SL
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: test-sht11.c,v 1.3 2011/02/27 07:39:55 enricmcalvo $
+ */
+
+/**
+ * \file
+ *         Testing the SHT11 sensor on the Zolertia Z1 Platform.
+ * \author
+ *         Nicolas Tsiftes <nvt@sics.se>
+ *         Enric M. Calvo <ecalvo@zolertia.com>
+ */
+
+#include "contiki.h"
+#include "dev/sht11.h"
+
+#include <stdio.h>
+
+PROCESS(test_sht11_process, "SHT11 test");
+AUTOSTART_PROCESSES(&test_sht11_process);
+
+PROCESS_THREAD(test_sht11_process, ev, data)
+{
+  static struct etimer et;
+  static unsigned rh;
+
+  PROCESS_BEGIN();
+  sht11_init();
+
+  for (etimer_set(&et, CLOCK_SECOND);; etimer_reset(&et)) {
+    PROCESS_YIELD();
+    printf("Temperature:   %u degrees Celsius\n",
+	(unsigned) (-39.60 + 0.01 * sht11_temp()));
+    rh = sht11_humidity();
+    printf("Rel. humidity: %u%%\n",
+	(unsigned) (-4 + 0.0405*rh - 2.8e-6*(rh*rh)));
+  }
+
+  PROCESS_END();
+}

platform/z1/dev/sht11-arch.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2011, Zolertia(TM) is a trademark of Advancare,SL
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ */
+
+/**
+ * \file
+ *	Architecture-specific definitions for the SHT11 sensor on Zolertia Z1
+ *      when connected to the Ziglet port.
+ * \author
+ *      Enric M. Calvo <ecalvo@zolertia.com>, adapted from work by
+ * 	Nicolas Tsiftes <nvt@sics.se>
+ */
+
+#ifndef SHT11_ARCH_H
+#define SHT11_ARCH_H
+
+// Architecture-specific definitions for the SHT11 sensor on Zolertia Z1
+// when connected to the Ziglet port. 
+// CAUTION: I2C needs to be disabled to use the bitbang protocol of SHT11
+
+#define SHT11_ARCH_SDA	1	/* P5.1 */
+#define SHT11_ARCH_SCL	2	/* P5.2 */
+// SHT11_ARCH_PWR is not needed, but until and *-arch abstraction exists, this
+// should fix it 
+#define SHT11_ARCH_PWR	3	/* P5.3 -- unused pin */ 
+
+#define	SHT11_PxDIR	P5DIR
+#define SHT11_PxIN	P5IN
+#define SHT11_PxOUT	P5OUT
+#define SHT11_PxSEL	P5SEL
+
+#endif