1

#define LED7_DDR    DDRB

     2

#define LED7_PORT   PORTB

     3

#define LED7_OE     PORTB1

     4

     5

// common anode?

     6

#define LED7_ANODE  0

     7

     8

#define LED7_OFFSET 0

     9

#define LED7_COUNT  2

    10

    11

static const uint8_t LED7SEG_FONT[] = {

    12

    0b00111111,	// 0

    13

    0b00000110,	// 1

    14

    0b01011011,	// 2

    15

    0b01001111,	// 3

    16

    0b01100110,	// 4

    17

    0b01101101,	// 5

    18

    0b01111101,	// 6

    19

    0b00000111,	// 7

    20

    0b01111111,	// 8

    21

    0b01100111,	// 9

    22

    0b01110111,	// A

    23

    0b01111100,	// B

    24

    0b00111001,	// C

    25

    0b01011110,	// D

    26

    0b01111001,	// E

    27

    0b01110001,	// F

    28

};

    29

    30

enum {

    31

    LED7SEG_DOT     = 0b10000000,

    32

};

    33

    34

void led7_init (void)

    35

{

    36

    sbi(&LED7_PORT, LED7_OE); // disabled (low)

    37

    sbi(&LED7_DDR, LED7_OE); // out

    38

}

    39

    40

/*

    41

 * Update external IO.

    42

 */

    43

void led7_update_raw (uint8_t *led7, char count)

    44

{

    45

    int i;

    46

    47

    for (i = 0; i < count; i++) {

    48

        char raw = LED7SEG_FONT[led7[i]];

    49

    50

        spi_tx[LED7_OFFSET + i] = LED7_ANODE ? ~raw  : raw;

    51

    } 

    52

}

    53

    54

void led7_update_hex (unsigned char c)

    55

{

    56

    uint8_t led7[2];

    57

    58

    led7[0] = c >> 4;

    59

    led7[1] = c & 0xF;

    60

    61

    return led7_update_raw(led7, sizeof(led7));

    62

}

    63

    64

void led7_update (char state)

    65

{

    66

    static unsigned char i = 0;

    67

    68

    if (i) {

    69

        // enable display

    70

        cbi(&LED7_PORT, LED7_OE);

    71

    }

    72

    73

    led7_update_hex(state);

    74

    75

    i++;

    76

}