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| Rev | Author | Line No. | Line |
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| 33 | jlesech | 1 | /**************************************************************************//** |
| 2 | * \brief ADC library. |
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| 3 | * \author Copyright (C) 2012 Julien Le Sech - www.idreammicro.com |
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| 4 | * \version 1.0 |
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| 5 | * \date 20121029 |
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| 6 | * |
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| 7 | * This file is part of the iDreamMicro library. |
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| 8 | * |
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| 9 | * This library is free software: you can redistribute it and/or modify it under |
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| 10 | * the terms of the GNU Lesser General Public License as published by the Free |
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| 11 | * Software Foundation, either version 3 of the License, or (at your option) any |
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| 12 | * later version. |
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| 13 | * |
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| 14 | * This library is distributed in the hope that it will be useful, but WITHOUT |
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| 15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| 16 | * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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| 17 | * details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU Lesser General Public License |
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| 20 | * along with this program. If not, see http://www.gnu.org/licenses/ |
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| 21 | ******************************************************************************/ |
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| 22 | |||
| 23 | /**************************************************************************//** |
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| 24 | * \file adc.c |
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| 25 | ******************************************************************************/ |
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| 26 | |||
| 27 | /****************************************************************************** |
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| 28 | * Header file inclusions. |
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| 29 | ******************************************************************************/ |
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| 30 | |||
| 31 | #include "../adc.h" |
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| 32 | |||
| 33 | #include <useful/bits.h> |
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| 34 | |||
| 35 | #include <avr/io.h> |
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| 36 | |||
| 37 | #include <stdint.h> |
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| 38 | |||
| 39 | /****************************************************************************** |
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| 40 | * Public function definitions. |
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| 41 | ******************************************************************************/ |
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| 42 | |||
| 43 | /**************************************************************************//** |
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| 44 | * \fn void adc__single_channel_initialize(adc__channel_t channel) |
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| 45 | * |
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| 46 | * \brief Initialize ADC. |
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| 47 | * |
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| 48 | * \param channel ADC channel. |
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| 49 | ******************************************************************************/ |
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| 50 | void |
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| 51 | adc__single_channel_initialize |
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| 52 | ( |
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| 53 | adc__channel_t channel |
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| 54 | ){ |
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| 55 | // Enable ADC. |
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| 56 | BIT__SET(ADCSRA, ADEN); |
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| 57 | |||
| 58 | // Clock prescaled by 16. |
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| 59 | // If Clock speed is 16 MHz, then ADC clock = 16 MHz / 16 = 1 MHz. |
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| 60 | ADCSRA |= 0b00000100; |
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| 61 | |||
| 62 | // Disable Digital Input on ADC Channel 0 to reduce power consumption |
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| 63 | DIDR0 = 0b00111111; |
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| 64 | |||
| 65 | // Disable Left-Adjust. |
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| 66 | ADMUX = 0b01000000; |
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| 67 | |||
| 68 | // Select ADC channel as input. |
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| 69 | ADMUX |= channel; |
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| 70 | } |
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| 71 | |||
| 72 | /**************************************************************************//** |
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| 73 | * \fn uint16_t adc__read(void) |
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| 74 | * |
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| 75 | * \brief Read ADC. |
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| 76 | * |
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| 77 | * \return Read value. |
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| 78 | ******************************************************************************/ |
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| 79 | uint16_t |
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| 80 | adc__single_channel_read |
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| 81 | ( |
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| 82 | void |
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| 83 | ){ |
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| 84 | // Start ADC Conversion. |
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| 85 | BIT__SET(ADCSRA, ADSC); |
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| 86 | |||
| 87 | // Wait till conversion is complete. |
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| 88 | //while ((ADCSRA & (1 << ADIF)) != 0x10); |
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| 89 | while (!BIT__TST(ADCSRA, ADIF)); |
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| 90 | |||
| 91 | // Read the ADC Result. |
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| 92 | uint16_t value = ADC; |
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| 93 | |||
| 94 | // Clear ADC Conversion Interrupt Flag. |
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| 95 | BIT__RST(ADCSRA, ADIF); |
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| 96 | |||
| 97 | return value; |
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| 98 | } |