91 lines
3 KiB
C
91 lines
3 KiB
C
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISE OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* -----------------------------------------------------------------
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*
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* Author : Robert Olsson
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* Created : 2015-10-27
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* Updated : $Date: 2010/08/25 19:30:52 $
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* $Revision: 1.11 $
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*/
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#include "contiki.h"
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#include "dev/temp_mcu-sensor.h"
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#include <util/delay_basic.h>
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#define delay_us(us) (_delay_loop_2(1 + (us * F_CPU) / 4000000UL))
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const struct sensors_sensor temp_mcu_sensor;
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/* Returns the MCU temp in C*10 read from the BATMON MCU register
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* See AtMega chip docs for BATMON details.
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*/
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static int
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value(int type)
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{
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uint16_t v;
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ADCSRB |= (1 << MUX5); /* this bit buffered till ADMUX written to! */
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ADMUX = 0xc9;
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/* ADC on /32 ADC start */
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ADCSRA = (1 << ADPS2) | (0 << ADPS1) | (1 << ADPS0);
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ADCSRA |= (1 << ADEN); /* Enable the ADC */
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while(!(ADCSRB & (1 << AVDDOK))) ; /* Wait for AVDD ok */
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while(!(ADCSRB & (1 << REFOK))) ; /* Wait for ref ok */
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ADCSRA |= (1 << ADSC); /* Throwaway conversion */
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while
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(ADCSRA & (1 << ADSC)) ;
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ADCSRA |= (1 << ADSC); /* Start conversion */
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while
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(ADCSRA & (1 << ADSC)) ;
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v = ADC;
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/* Disable the ADC to save power */
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ADCSRA &= ~_BV(ADEN);
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/* ADMUX = 0; //turn off internal vref */
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return (int)((double)(v * 1.13 - 272.8) * 10);
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}
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static int
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configure(int type, int c)
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{
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return 0;
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}
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static int
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status(int type)
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{
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return 1;
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}
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SENSORS_SENSOR(temp_mcu_sensor, TEMP_MCU_SENSOR, value, configure, status);
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