refactored some ADC code into sky-sensors and made it possible to turn off sensors to save energy

2010-02-02 20:59:45 +00:00 · 2010-02-02 20:59:45 +00:00 · fd4aebdf7f
commit fd4aebdf7f
parent fcf60e9260
5 changed files with 152 additions and 35 deletions
--- a/platform/sky/dev/sky-sensors.c
+++ b/platform/sky/dev/sky-sensors.c
@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2010, Swedish Institute of Computer Science.
+ * 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: sky-sensors.c,v 1.1 2010/02/02 20:59:45 joxe Exp $
+ *
+ * -----------------------------------------------------------------
+ *
+ * Author  : Joakim Eriksson
+ * Created : 2010-02-02
+ * Updated : $Date: 2010/02/02 20:59:45 $
+ *           $Revision: 1.1 $
+ */
+#include <stdlib.h>
+
+#include <io.h>
+#include "contiki.h"
+
+static uint8_t adc_on;
+/*---------------------------------------------------------------------------*/
+void
+sky_sensors_activate(uint8_t type)
+{
+  uint8_t pre = adc_on;
+
+  adc_on |= type;
+  P6SEL |= type;
+
+  if(pre == 0 && adc_on > 0) {
+    P6DIR = 0xff;
+    P6OUT = 0x00;
+
+    /* if nothing was started before, start up the ADC system */
+    /* Set up the ADC. */
+    ADC12CTL0 = REF2_5V + SHT0_6 + SHT1_6 + MSC; /* Setup ADC12, ref., sampling time */
+    ADC12CTL1 = SHP + CONSEQ_3 + CSTARTADD_0;	/* Use sampling timer, repeat-sequenc-of-channels */
+    /* convert up to MEM4 */
+    ADC12MCTL4 |= EOS;
+
+    ADC12CTL0 |= ADC12ON + REFON;
+    ADC12CTL0 |= ENC;		/* enable conversion */
+    ADC12CTL0 |= ADC12SC;		/* sample & convert */
+  }
+}
+/*---------------------------------------------------------------------------*/
+void
+sky_sensors_deactivate(uint8_t type)
+{
+  adc_on &= ~type;
+
+  if(adc_on == 0) {
+    /* stop converting immediately, turn off reference voltage, etc. */
+    /* wait for conversion to stop */
+
+    ADC12CTL0 &= ~ENC;
+    /* need to remove CONSEQ_3 if not EOS is configured */
+    ADC12CTL1 &= ~CONSEQ_3;
+
+    while(ADC12CTL1 & ADC12BUSY);
+
+    ADC12CTL0 = 0;
+    ADC12CTL1 = 0;
+
+    P6DIR = 0x00;
+    P6OUT = 0x00;
+    P6SEL = 0x00;
+  }
+}
+/*---------------------------------------------------------------------------*/