MHVLib
20111011
An efficiency oriented runtime library for AVR microcontrollers
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00001 /* 00002 * Copyright (c) 2011, Make, Hack, Void Inc 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions are met: 00007 * * Redistributions of source code must retain the above copyright 00008 * notice, this list of conditions and the following disclaimer. 00009 * * Redistributions in binary form must reproduce the above copyright 00010 * notice, this list of conditions and the following disclaimer in the 00011 * documentation and/or other materials provided with the distribution. 00012 * * Neither the name of the Make, Hack, Void nor the 00013 * names of its contributors may be used to endorse or promote products 00014 * derived from this software without specific prior written permission. 00015 * 00016 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 00017 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00018 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00019 * DISCLAIMED. IN NO EVENT SHALL MAKE, HACK, VOID BE LIABLE FOR ANY 00020 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00021 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00022 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00023 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00024 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00025 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00026 */ 00027 #include <MHV_ADC.h> 00028 00035 MHV_ADC::MHV_ADC(MHV_EVENT_ADC *adcs, uint8_t adcCount) { 00036 _adcs = adcs; 00037 _adcCount = adcCount; 00038 00039 _adcChannel = -1; 00040 00041 mhv_memClear(_adcs, sizeof(*_adcs), adcCount); 00042 } 00043 00047 void MHV_ADC::adc() { 00048 _adcValue = ADC; 00049 _adcChannel = MHV_AD_CHANNEL; 00050 00051 MHV_AD_DISABLE_INTERRUPT; 00052 } 00053 00059 void MHV_ADC::registerListener(uint8_t channel, MHV_ADCListener *listener) { 00060 for (uint8_t i = 0; i < _adcCount; i++) { 00061 if (_adcs[i].channel == -1) { 00062 _adcs[i].channel = channel; 00063 _adcs[i].listener = listener; 00064 break; 00065 } 00066 } 00067 } 00068 00073 void MHV_ADC::deregisterListener(uint8_t channel) { 00074 for (uint8_t i = 0; i < _adcCount; i++) { 00075 if (_adcs[i].channel == channel) { 00076 _adcs[i].channel = -1; 00077 break; 00078 } 00079 } 00080 } 00081 00087 uint16_t MHV_ADC::busyRead(uint8_t channel, uint8_t reference) { 00088 ADMUX = reference | (channel & 0x0F); 00089 00090 #ifdef MUX5 00091 ADCSRB = (ADCSRB & ~_BV(MUX5)) | ((channel & _BV(5) >> (5-MUX5))); 00092 #endif 00093 00094 // Start the conversion 00095 ADCSRA |= _BV(ADSC); 00096 00097 while (ADCSRA & _BV(ADSC)) {}; 00098 00099 return ADC; 00100 } 00101 00107 void MHV_ADC::asyncRead(uint8_t channel, uint8_t reference) { 00108 ADMUX = reference | (channel & 0x0F); 00109 00110 #ifdef MUX5 00111 ADCSRB = (ADCSRB & ~_BV(MUX5)) | ((channel & _BV(5) >> (5-MUX5))); 00112 #endif 00113 00114 // Start the conversion 00115 ADCSRA |= _BV(ADSC); 00116 00117 MHV_AD_ENABLE_INTERRUPT; 00118 } 00119 00124 void MHV_ADC::setPrescaler(MHV_AD_PRESCALER prescaler) { 00125 ADCSRA = (ADCSRA & 0xf8) | (prescaler & 0x7); 00126 } 00127 00128 00132 void MHV_ADC::handleEvents() { 00133 uint8_t i; 00134 00135 if (_adcChannel != -1) { 00136 for (i = 0; i < _adcCount; i++) { 00137 if (_adcs[i].channel == _adcChannel) { 00138 _adcChannel = -1; 00139 _adcs[i].listener->adc(_adcs[i].channel, _adcValue); 00140 break; 00141 } 00142 } 00143 } 00144 }