graph  TD
    A[System Start]  -->B[Initialization]
    B  -->  C(Read shutter_period_time value in config.json)
    C  -->  T1[thread_shutter_pulse begin]
    C  -->  T2[thread_shutter_record begin]
    C  -->  INT[button_callback begin]
    C  -->  T3[thread_i2c begin]

    T1  -->  T11(Open LED1 and LED2)
    T11  -->  T1D1(Wait seconds at shutter_period_time)
    T1D1  -->  T12(Close LED1 and LED2)
    T12  -->  T1D2(Wait seconds at shutter_period_time)
    T1D2  -->  T11

    T2  -->  T2INT{Is it_occured value set?}
    T2INT  -->  |Yes| T2SAVE(Save values from ts_buffer array to shutter.csv)
    T2SAVE  -->  T2CLEAR(Clear it_occured flag and ts_buffer array)
    T2CLEAR  -->  T2SET(Set i2c_flag)
    T2SET  -->  T2D1(Wait seconds at shutter_period_time)
    T2D1  -->  T2INT
    T2INT  -->  |No| T2D2(Wait seconds at shutter_period_time)
    T2D2  -->  T2INT

    INT  -->  INT_ISPRESSED{Is button pressed?}
    INT_ISPRESSED  -->  |Yes| INT_ISPRESSED_Y(Save current timestamp value to ts_buffer array and print it with cout)
    INT_ISPRESSED_Y  -->  INT_ISPRESSED_1(set it_occured flag)
    INT_ISPRESSED_1  -->  INT_ISPRESSED
    INT_ISPRESSED  -->  |No| INT_ISPRESSED

    T3  -->  T3_INT{Is i2c_flag set?}
    T3_INT  -->  |Yes| T3_STM(Wake Receive Interrupt on STM32F407VG board)
    T3_STM  -->  T3_CNT(Sum the incoming data bytes and print the sum which is the counter value)
    T3_CNT  -->  T3_RST(Reset i2c_flag)
    T3_RST  -->  T3_INT
    T3_INT  -->  |No| T3_INT

graph TD
    A[System Start] -->B[Initialization]
    B --> C(Set 0 all bytes of i2c_veri)
    C --> D{Is receive interrupt occured?}
    D --> |No| D
    D --> |Yes| E(Send 4 byte i2c_veri)
    
    E --> CFB{Is first byte of i2c_veri less then 255?}
    CFB --> |Yes| FBI(Increase first byte of i2c_veri)
    FBI --> D
    CFB --> |No| CSB{Is first byte of i2c_veri equal 255 and second byte of i2c_veri less then 255?}
    
    CSB --> |Yes| SBI(Increase second byte of i2c_veri)
    SBI --> D
    CSB --> |No| CTB{Is second byte of i2c_veri equal 255 and third byte of i2c_veri less then 255?}
    
    CTB --> |Yes| TBI(Increase third byte of i2c_veri)
    TBI --> D
    CTB --> |No| CFFB{Is third byte of i2c_veri equal 255 and fourth byte of i2c_veri less then 255?}
    
    CFFB --> |Yes| FFBI(Increase fourth byte of i2c_veri)
    FFBI --> D
    CFFB --> |No| RST(Reset i2c_veri array)
    RST --> D