50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
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//spi.h - hardware SPI
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#ifndef SPI_H
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#define SPI_H
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#include <inttypes.h>
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#include <avr/io.h>
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#include "config.h"
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#define SPI_SPCR(rat, pha, pol, mst, dor) ((rat & 3) | (pha?(1<<CPHA):0) | (pol?(1<<CPOL):0) | (mst?(1<<MSTR):0) | (dor?(1<<DORD):0) | (1<<SPE))
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#define SPI_SPSR(rat) ((rat & 4)?(1<<SPI2X):0)
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#define DD_SS 0
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#define DD_SCK 1
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#define DD_MOSI 2
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#define DD_MISO 3
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#if defined(__cplusplus)
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extern "C" {
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#endif //defined(__cplusplus)
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static inline void spi_init()
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{
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DDRB &= ~((1 << DD_SCK) | (1 << DD_MOSI) | (1 << DD_MISO));
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DDRB |= (1 << DD_SS) | (1 << DD_SCK) | (1 << DD_MOSI);
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PORTB &= ~((1 << DD_SCK) | (1 << DD_MOSI) | (1 << DD_MISO));
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PORTB |= (1 << DD_SS);
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SPCR = SPI_SPCR(0, 0, 0, 1, 0); //SPE=1, MSTR=1 (0x50)
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SPSR = 0x00;
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}
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static inline void spi_setup(uint8_t spcr, uint8_t spsr)
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{
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SPCR = spcr;
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SPSR = spsr;
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}
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static inline uint8_t spi_txrx(uint8_t tx)
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{
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SPDR = tx;
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while (!(SPSR & (1 << SPIF)));
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return SPDR;
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}
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#if defined(__cplusplus)
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}
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#endif //defined(__cplusplus)
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#endif //SPI_H
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