1 #ifndef QMSK_SPI_H

     2 #define QMSK_SPI_H

     3 

     4 #include "stdlib.h"

     5 #include "port.h"

     6 

     7 static ioport_t *const SPI_DDR = &DDRB;

     8 static ioport_t *const SPI_PORT = &PORTB;

     9 

    10 static const byte SPI_SCK   = PORTB5;

    11 static const byte SPI_MISO  = PORTB4;

    12 static const byte SPI_MOSI  = PORTB3;

    13 static const byte SPI_SS    = PORTB2;

    14 

    15 enum spi_dord {

    16     SPI_DORD_MSB        = 0b0,

    17 

    18     SPI_DORD            = SPI_DORD_MSB

    19 };

    20 

    21 enum spi_cpol {

    22     SPI_CPOL_0 = 0b0,

    23     SPI_CPOL_1 = 0b1,

    24 

    25     SPI_CPOL   = SPI_CPOL_1 // mode 3

    26 };

    27 

    28 enum spi_cpha {

    29     SPI_CPHA_0  = 0b0,

    30     SPI_CPHA_1  = 0b1,

    31 

    32     SPI_CPHA   = SPI_CPHA_1 // mode 3

    33 };

    34 

    35 enum spi_clock {

    36     SPI_CLOCK_4         = 0b000,

    37     SPI_CLOCK_16        = 0b001,

    38     SPI_CLOCK_64        = 0b010,

    39     SPI_CLOCK_128       = 0b011,

    40 

    41     SPI_CLOCK           = SPI_CLOCK_16

    42 };

    43 

    44 #define SPI_COUNT 2

    45 

    46 /*

    47  * Initialize in SPI master mode.

    48  */

    49 void spi_init ();

    50 

    51 /*

    52  * Write out value, and return read value.

    53  */

    54 byte spi_readwrite (byte value);

    55 

    56 /*

    57  * Perform an SPI bus update.

    58  */

    59 void spi_update ();

    60 

    61 void spi_set (byte index, byte value);

    62 

    63 byte spi_get (byte index);

    64 

    65 #endif