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51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
#include <avr/io.h>
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#include "spi.h"
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#include "globals.h"
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/*
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* Initialize SPI bus.
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*/
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//~ // From working SPI ENC28J60 driver
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//~ #define ENC28J60_CONTROL_PORT PORTB
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//~ #define ENC28J60_CONTROL_DDR DDRB
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//~
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//~ #define ENC28J60_CONTROL_CS PORTB6
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//~ #define ENC28J60_CONTROL_SO PORTB3
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//~ #define ENC28J60_CONTROL_SI PORTB2
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//~ #define ENC28J60_CONTROL_SCK PORTB1
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//~ #define ENC28J60_CONTROL_SS PORTB0
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//~
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//~ // set CS to 0 = active
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//~ #define CSACTIVE ENC28J60_CONTROL_PORT&=~(1<<ENC28J60_CONTROL_CS)
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//~ // set CS to 1 = passive
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//~ #define CSPASSIVE ENC28J60_CONTROL_PORT|=(1<<ENC28J60_CONTROL_CS)
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//
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//~ #define waitspi() while(!(SPSR&(1<<SPIF)))
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void
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spi_init(void)
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{
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// CS PIN for FLASH
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DDRB |= _BV(WIZNET_CS); // CS to OUT && Disable
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SPI_WIZNET_DISABLE();
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/* Initalize ports for communication with SPI units. */
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/* CSN=SS and must be output when master! */
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DDRB |= _BV(MOSI) | _BV(SCK) | _BV(CSN);
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PORTB |= _BV(MOSI) | _BV(SCK);
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/* Enables SPI, selects "master", clock rate FCK / 4 - 4Mhz, and SPI mode 0 */
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SPCR = _BV(SPE) | _BV(MSTR);
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#if defined(SPI_8_MHZ)
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SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
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#elif defined (SPI_4_MHZ)
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SPSR = 0x0; //FCK / 4 - 4Mhz
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#else
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SPSR = 0x0; //FCK / 4 - 4Mhz
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#endif
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}
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