Attiny13+ TM1637 . не могу разобраться

/**
 * Copyright (c) 2018, Łukasz Marcin Podkalicki <lpodkalicki@gmail.com>
 *
 * This is ATtiny13 "Running Digits, Dots 
 
and LEDs" example using attiny-tm1637-library,
 * https://github.com/lpodkalicki/attiny-tm1637-library .
 */
 
#include 
 
<avr/io.h>
#include <stdint.h>
#include <util/delay.h>
#include "tm1638.h"
 
static uint8_t scan_keys_demo(void);
static void 
 
digits_and_dots_demo(uint8_t n);
static void leds_demo(uint8_t n);
 
int
main(void)
{
    uint8_t n = 0, k = 0, keys;
 
    /* setup 
 
*/
    TM1638_init(1/*enable*/, 3/*brighness*/);
 
    /* loop */
    while (1) {
        keys = scan_keys_demo();
    
 
    if ((k % 10) == 0) { 
            digits_and_dots_demo(n);
            if (!keys) {
            
 
    leds_demo(n);
            }
            n++;
        }
        k++;
        
 
_delay_ms(30);
    }
}
 
uint8_t
scan_keys_demo(void)
{
    uint8_t i, keys;
 
    keys = TM1638_scan_keys();
    for (i = 0; i < 
 
8; ++i) {
        TM1638_set_led((i + 1) % 8, !!(keys & (1 << i)));
    }
 
    return keys;
}
 
void
digits_and_dots_demo(uint8_t n)
{
    uint8_t i;
 
    for (i = 0; i < 8; ++i) {
        TM1638_display_digit(i, 
 
(n + i) % 0x10, !!(n % 0x02));
    }
}
 
void
leds_demo(uint8_t n)
{
    uint8_t i;
 
    for (i = 0; i < 8; ++i) {
        
 
TM1638_set_led(i, !!((i + n) % 0x02));
    }
}

#ifndef _ATTINY_TM1637_H_
#define _ATTINY_TM1637_H_
 
#include <stdint.h>
 
// Main Settings
#define TM1637_DIO_PIN          PB0
#define TM1637_CLK_PIN          PB1
#define TM1637_DELAY_US         (5)
#define TM1637_BRIGHTNESS_MAX       (7)
#define TM1637_POSITION_MAX     (4)
 
// TM1637 commands
#define TM1637_CMD_SET_DATA     0x40
#define TM1637_CMD_SET_ADDR     0xC0
#define TM1637_CMD_SET_DSIPLAY      0x80
 
// TM1637 data settings (use bitwise OR to contruct complete command)
#define TM1637_SET_DATA_WRITE       0x00 // write data to the display register
#define TM1637_SET_DATA_READ        0x02 // read the key scan data
#define TM1637_SET_DATA_A_ADDR      0x00 // automatic address increment
#define TM1637_SET_DATA_F_ADDR      0x04 // fixed address
#define TM1637_SET_DATA_M_NORM      0x00 // normal mode
#define TM1637_SET_DATA_M_TEST      0x10 // test mode
 
// TM1637 display control command set (use bitwise OR to consruct complete command)
#define TM1637_SET_DISPLAY_OFF      0x00 // off
#define TM1637_SET_DISPLAY_ON       0x08 // on
 
 
/**
 * Initialize TM1637 display driver.
 * Clock pin (TM1637_CLK_PIN) and data pin (TM1637_DIO_PIN)
 * are defined at the top of this file.
 */
void TM1637_init(const uint8_t enable, const uint8_t brightness);
 
/**
 * Turn display on/off.
 * value: 1 - on, 0 - off
 */
void TM1637_enable(const uint8_t value);
 
/**
 * Set display brightness.
 * Min value: 0
 * Max value: 7
 */
void TM1637_set_brightness(const uint8_t value);
 
/**
 * Display raw segments at position (0x00..0x03)
 *
 *      bits:
 *        -- 0 --
 *       |       |
 *       5       1
 *       |       |
 *        -- 6 --
 *       |       |
 *       4       2
 *       |       |
 *        -- 3 --
 *
 * Example segment configurations:
 * - for character 'H', segments=0b01110110
 * - for character '-', segments=0b01000000
 * - etc.
 */
void TM1637_display_segments(const uint8_t position, const uint8_t segments);
 
/**
 * Display digit ('0'..'9') at position (0x00..0x03)
 */
void TM1637_display_digit(const uint8_t position, const uint8_t digit);
 
/**
 * Display colon on/off.
 * value: 1 - on, 0 - off
 */
void TM1637_display_colon(const uint8_t value);
 
/**
 * Clear all segments (including colon).
 */
void TM1637_clear(void);
 
#endif  /* !_ATTINY_TM1637_H_ */

#define TM1637_DIO_PIN          PB0
#define TM1637_CLK_PIN          PB1