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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 67 | jlesech | 1 | /**************************************************************************//** |
| 2 | * \brief SPI library |
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| 3 | * \author Copyright (C) 2011 Julien Le Sech - www.idreammicro.com |
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| 4 | * \version 1.0 |
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| 5 | * \date 20110315 |
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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 spi_slave.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 <spi/spi.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 | #if defined (__AVR_ATmega128__) |
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| 40 | #include "../include/spi_atmega128.h" |
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| 41 | #elif defined (__AVR_ATmega328P__) || defined (__AVR_ATmega328__) |
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| 42 | #include "../include/spi_atmega328.h" |
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| 43 | #elif defined (__AVR_ATmega2560__) |
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| 44 | #include "../include/spi_atmega2560.h" |
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| 45 | #endif |
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| 46 | |||
| 47 | /****************************************************************************** |
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| 48 | * Public function definitions. |
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| 49 | ******************************************************************************/ |
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| 50 | |||
| 51 | /**************************************************************************//** |
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| 52 | * \fn void spi_slave__initialize(void) |
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| 53 | * |
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| 54 | * \brief Initialize SPI in slave mode. |
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| 55 | ******************************************************************************/ |
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| 56 | void |
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| 57 | spi_slave__initialize |
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| 58 | ( |
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| 59 | void |
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| 60 | ){ |
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| 61 | // Configure pins. |
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| 62 | DDR_SPI = _BV(DD_MISO); |
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| 63 | |||
| 64 | // Enable SPI. |
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| 65 | SPCR = _BV(SPE); |
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| 66 | } |
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| 67 | |||
| 68 | /**************************************************************************//** |
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| 69 | * \fn uint8_t spi_slave__receive(void) |
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| 70 | * |
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| 71 | * \brief Receive data. |
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| 72 | * |
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| 73 | * \return Received data. |
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| 74 | ******************************************************************************/ |
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| 75 | uint8_t |
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| 76 | spi_slave__receive |
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| 77 | ( |
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| 78 | void |
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| 79 | ){ |
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| 80 | // Wait for previous transmission complete. |
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| 81 | while (!(SPSR & (1 << SPIF))); |
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| 82 | |||
| 83 | // Read data from SPI data register. |
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| 84 | return SPDR; |
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| 85 | } |