42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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/*
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* spi.h
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*
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* http://www.atmel.com/dyn/resources/prod_documents/doc2585.pdf
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*
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* Copyright 2011 Mika Tuupola
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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*/
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/* http://www.atmel.com/dyn/resources/prod_documents/doc8161.pdf */
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#if defined(__AVR_ATmega168__) \
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|| defined(__AVR_ATmega168P__) \
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|| defined(__AVR_ATmega328__) \
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|| defined (__AVR_ATmega328P__)
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#define SPI_SS PB2 /* Slave Select. PORTB2 LATCH RCK*/
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#define SPI_SCLK PB5 /* Serial clock. PORTB5 CLOCK */
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#define SPI_MOSI PB3 /* Master Out Slave In. PORTB3 DATA*/
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#define SPI_MISO PB4 /* Master In Slave Out PORTB4 */
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/* http://www.pjrc.com/teensy/atmega32u4.pdf */
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#elif defined (__AVR_ATmega32U4__)
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#define SPI_SS B0
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#define SPI_SCLK B1
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#define SPI_MOSI B2
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#define SPI_MISO B3
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#endif
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#define spi_set_lsb() SPCR |= _BV(DORD)
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#define spi_set_msb() SPCR &= ~(_BV(DORD))
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#define spi_set_master() SPCR |= _BV(MSTR)
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#define spi_set_slave() SPCR &= ~(_BV(MSTR))
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#define spi_enable() SPCR |= _BV(SPE)
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#define spi_disable() SPCR &= ~(_BV(SPE));
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uint8_t spi_transfer(volatile uint8_t data);
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void spi_init(void);
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