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/*
* Copyright (c) 2007 empronix (http://www.empronix.com)
* Author: Benedikt Sauter <sauter@empronix.com>
* All rights reserved.
*
* Short descripton of file:
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the FH Augsburg 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*/
#include "common.h"
#include "protocol.h"
#include "adc.h"
#include <stdio.h>
#include "debug.h"
void adc_parser(char *buf)
{
//debugf("adc parser CMD %02x\n",buf[0]);
switch(buf[0])
{
case CMD_ADC_INIT_PIN:
adc_init_usb(buf[2]);
break;
case CMD_ADC_DEINIT_PIN:
adc_deinit_usb(buf[2]);
break;
case CMD_ADC_GET:
adc_get_usb(buf[2]);
break;
case CMD_ADC_REF:
adc_ref_usb(buf[2]);
break;
default:
answer[0]=buf[0];
answer[1]=RSP_UNKOWN_CMD;
answer[2]=0;
CommandAnswer(3);
}
}
int adc_init(uint8_t pin)
{
if (pin >= 10 && pin <= 17)
{
octopus.ports[pin] = PIN_AD;
ADMUX |= (1<<REFS1) | (1<<REFS0); // interne Referenzspannung nutzen
return RSP_OK;
}
return RSP_UNKOWN_PIN;
}
void adc_init_usb(uint8_t pin)
{
answer[0]=CMD_ADC_INIT_PIN;
answer[1]=(unsigned char)adc_init(pin);
answer[2]=0;
CommandAnswer(3);
}
int adc_deinit(uint8_t pin)
{
if (octopus.ports[pin] == PIN_AD)
{
octopus.ports[pin] = PIN_NONE;
return RSP_OK;
}
return RSP_UNKOWN_PIN;
}
void adc_deinit_usb(uint8_t pin)
{
answer[0]=CMD_ADC_DEINIT_PIN;
answer[1]= (unsigned char)adc_deinit(pin);
answer[2]=0;
CommandAnswer(3);
}
void adc_get_usb(uint8_t pin)
{
uint16_t result;
//uint8_t result[2];
answer[0]=CMD_ADC_GET;
answer[1]=adc_get(pin,&result);
//result[0] = 0x77;
//result[1] = 0x88;
//answer[2]=(char)result[1]; //high
//answer[3]=(char)result[0]; //low
answer[2]=(char)(result>>8); //high
answer[3]=(char)(result); //low
CommandAnswer(4);
}
int adc_get(uint8_t pin, uint16_t *value)
{
*value = 0;
if (octopus.ports[pin] == PIN_AD)
{
// 40 => 0
// 39 => 1
// 38 => 2
// pin => 40-pin
*value =_adc_read_channel(17 - pin);
debugf("Wert %i\r\n",*value);
return RSP_OK;
}
else
return RSP_WRONG_PIN_CONFIG;
}
void adc_ref_usb(uint8_t ref)
{
answer[0]=CMD_ADC_REF;
answer[1]=adc_ref(ref);
answer[2]=0;
CommandAnswer(3);
}
int adc_ref(uint8_t ref)
{
ADMUX = 0x00;
switch(ref)
{
case PARAM_ADC_AREF: break;
case PARAM_ADC_AVCC: ADMUX |= (1<<REFS0); break;
case PARAM_ADC_INTERNAL: ADMUX |= (1<<REFS1) | (1<<REFS0); break;
default:
return RSP_ERROR;
}
return RSP_OK;
}
uint16_t _adc_read_channel(uint8_t mux)
{
int i;
uint16_t result;
//ADMUX |= mux; // Kanal waehlen
ADCSRA = (1<<ADEN) | (1<<ADPS1) | (1<<ADPS0); // Frequenzvorteiler
// setzen auf 8 (1) und ADC aktivieren (1)
ADMUX = (ADMUX & 0xF0) | mux; // select channel
//ADMUX |= (1<<REFS1) | (1<<REFS0); // interne Referenzspannung nutzen
/* nach Aktivieren des ADC wird ein "Dummy-Readout" empfohlen, man liest
also einen Wert und verwirft diesen, um den ADC "warmlaufen zu lassen" */
ADCSRA |= (1<<ADSC); // eine ADC-Wandlung
while ( ADCSRA & (1<<ADSC) ) {
; // auf Abschluss der Konvertierung warten
}
result = ADCW; // ADCW muss einmal gelesen werden,
// sonst wird Ergebnis der n�chsten Wandlung
// nicht �bernommen.
/* Eigentliche Messung - Mittelwert aus 4 aufeinanderfolgenden Wandlungen */
result = 0;
for( i=0; i<4; i++ )
{
ADCSRA |= (1<<ADSC); // eine Wandlung "single conversion"
while ( ADCSRA & (1<<ADSC) ) {
; // auf Abschluss der Konvertierung warten
}
result += ADCW; // Wandlungsergebnisse aufaddieren
}
ADCSRA &= ~(1<<ADEN); // ADC deaktivieren (2)
result /= 4; // Summe durch vier teilen = arithm. Mittelwert
return result;
}
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