New Contiki port to STM32W108.

platform/mb851/dev/temperature-sensor.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2010, STMicroelectronics.
+ * 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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 OS
+ *
+ * $Id: temperature-sensor.c,v 1.1 2010/10/25 09:03:39 salvopitru Exp $
+ */
+/*---------------------------------------------------------------------------*/
+/**
+* \file
+*			Temperature sensor.
+* \author
+*			Salvatore Pitrulli <salvopitru@users.sourceforge.net>
+*/
+/*---------------------------------------------------------------------------*/
+
+/**
+ *  NOTE: 
+ *  For the temperature measurement, the ADC extended range mode is needed;
+ *  but this is inaccurate due to the high voltage mode bug of the general purpose ADC 
+ *  (see STM32W108 errata).
+ */
+
+
+#include PLATFORM_HEADER
+#include BOARD_HEADER
+#include "hal/error.h"
+#include "hal/hal.h"
+#include "micro/adc.h"
+
+#include "dev/temperature-sensor.h"
+
+
+/*---------------------------------------------------------------------------*/
+static void
+init(void)
+{
+  halGpioConfig(TEMPERATURE_SENSOR_GPIO,GPIOCFG_ANALOG);
+  halInternalInitAdc();
+  halAdcSetRange(TRUE);
+}
+/*---------------------------------------------------------------------------*/
+static int
+value(int type)
+{
+  static int16u ADCvalue;
+  static int16s volts;
+  
+  halStartAdcConversion(ADC_USER_APP, ADC_REF_INT, ADC_SOURCE_ADC2_VREF2, ADC_CONVERSION_TIME_US_4096);
+  
+  halReadAdcBlocking(ADC_USER_APP, &ADCvalue); // This blocks for a while, about 4ms.
+  
+  // 100 uVolts
+  volts = halConvertValueToVolts(ADCvalue);
+  
+  //return ((18641 - (int32s)volts)*100)/1171;  // +- 0.23 degC in the range (-10;65) degC
+  return ((18663 - (int32s)volts)*100)/1169;   // +- 0.004 degC in the range (20;30) degC
+  
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, int value)
+{
+  switch(type){
+    case SENSORS_HW_INIT:
+      init();
+      return 1;
+    case SENSORS_ACTIVE:
+      return 1;
+  }
+       
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static int
+status(int type)
+{
+  switch(type) {
+    
+    case SENSORS_READY:
+      return 1;
+  }
+  
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(temperature_sensor, TEMPERATURE_SENSOR,
+	       value, configure, status);