Готовая библиотека i2c

Reviewed-on: #6

.gitignore

@@ -1,9 +0,0 @@
-hdlc1.c
-hdlc1.h
-hdlc_frame.c
-hdlc_frame.h
-main1.c
-uart.c
-uart.h
-
-!./hdlc

.idea/modules.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/untitled1.iml" filepath="$PROJECT_DIR$/.idea/untitled1.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/Display_Avr_3.iml" filepath="$PROJECT_DIR$/.idea/Display_Avr_3.iml" />
     </modules>
   </component>
 </project>

CMakeLists.txt

@@ -1,6 +0,0 @@
-cmake_minimum_required(VERSION 3.25)
-project(untitled1 C)
-
-set(CMAKE_C_STANDARD 11)
-
-add_executable(untitled1 hdlc/fcs.h hdlc/fcs.c hdlc/hdlc.h hdlc/hdlc.c hdlc/main.c hdlc/client.c)

MyLCD.h

@@ -0,0 +1,22 @@
+
+#ifndef MYLCD_H_
+#define MYLCD_H_
+
+
+// ïîäêëþ÷àåì âñå ëèáû
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <compat/twi.h>
+#include <inttypes.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <stdio.h>
+#include "lcdpcf8574.h"
+#include "pcf8574.h"
+#include "i2cmaster.h"
+
+
+#endif

Readme.md

@@ -12,4 +12,5 @@
 * Отрисовка данных на дисплей
 
 Деркачев Андрей
-* Соединения и рефактор блоков UART, HDLC и вывода
+* Соединения и рефактор блоков UART, HDLC и вывода
+* Работа с I2C

frame.c

@@ -0,0 +1,380 @@
+#include "frame.h"
+
+#include <stdio.h>
+
+extern int window_length;
+extern int raw_data_length;
+extern int frame_number_range;
+
+
+/* 33 crc*/
+short crc[] = {1, 0, 0, 0, 0, 0,
+               1, 0, 0, 1, 1, 0,
+               0, 0, 0, 0, 1,
+               0, 0, 0, 1, 1, 1,
+               0, 1, 1, 0, 1, 1,
+               0, 1, 1, 1};
+
+
+
+short send_receive_num[][3] = {{0, 0, 0},
+                               {0, 0, 1},
+                               {0, 1, 0},
+                               {0, 1, 1},
+                               {1, 0, 0},
+                               {1, 0, 1},
+                               {1, 1, 0},
+                               {1, 1, 1}
+};
+
+static Frame *fill_flag_and_fcs(Frame *p_frame) {
+
+    short s[] = {0, 1, 1, 1, 1, 1, 1, 0};
+    int i;
+    for (i = 0; i < 8; ++i) {
+        p_frame ->head_flag[i] = s[i];
+        p_frame ->rail_flag[i] = s[i];
+    }
+    for (i = 0; i < (sizeof(crc) / sizeof(short) - 1); ++i) {
+        p_frame ->fcs[i] = 0;
+    }
+
+    return p_frame;
+}
+
+static Frame *create_generic_unnumbered_frame(Frame *p_frame) {
+
+    fill_flag_and_fcs(p_frame);
+    p_frame ->control[0] = 1;
+    p_frame ->control[1] = 1;
+    p_frame ->s.size = 0;
+    return p_frame;
+}
+
+static Frame *create_generic_info_frame(Frame *p_frame) {
+
+    fill_flag_and_fcs(p_frame);
+    p_frame ->control[0] = 0;
+    p_frame ->s.size = 0;
+    return p_frame;
+}
+
+static Frame *create_generic_sup_frame(Frame *p_frame) {
+
+    fill_flag_and_fcs(p_frame);
+    p_frame ->control[0] = 1;
+    p_frame ->control[1] = 0;
+    p_frame ->s.size = 0;
+    return p_frame;
+}
+
+
+static void convert_frame_to_seq(Frame *p_frame, short seq[], int *size) {
+
+    int i;
+    (*size) = 0;
+    for (i = 0; i < 8; ++i) {
+        seq[*size] = p_frame ->address[i];
+        ++(*size);
+    }
+
+    for (i = 0; i < 8; ++i) {
+        seq[*size] = p_frame ->control[i];
+        ++(*size);
+    }
+
+    for (i = 0; i < p_frame ->s.size; ++i) {
+        if (1 == (p_frame ->s.infor_type[i])) {
+            seq[*size] = p_frame ->s.information[i];
+            ++(*size);
+        }
+    }
+    for (i = 0; i < sizeof(crc) / sizeof(short) - 1; ++i) {
+        seq[*size] = p_frame ->fcs[i];
+        ++(*size);
+    }
+}
+/* 0 has been filled before calling this method.*/
+
+static int seq_fcs(short seq[], int size) {
+
+    int i;
+    int non_zero = 0;
+    int temp_non_zero;
+    bool new_non_zero = 0;
+
+    for (i = 0; i < size; ++i) {
+        if (1 == seq[i]) {
+            non_zero = i;
+            new_non_zero = 1;
+            break;
+        }
+    }
+
+    for (;non_zero <= size - sizeof(crc)/sizeof(short);) {
+        new_non_zero = 0;
+        temp_non_zero = -1;
+        for (i = non_zero; i < non_zero + sizeof(crc)/sizeof(short); ++i) {
+            seq[i] ^= crc[i - non_zero];
+            if ((1 == seq[i]) && !new_non_zero) {
+                temp_non_zero = i;
+                new_non_zero = 1;
+            }
+        }
+
+        if (-1 == temp_non_zero) {
+            for (i = non_zero + sizeof(crc) / sizeof(short); i < size; ++i) {
+                if (1 == seq[i]) {
+                    non_zero = i;
+                    break;
+                }
+            }
+            if (i == size) return -1;
+        } else {
+            non_zero = temp_non_zero;
+        }
+    }
+
+    return non_zero;
+}
+
+/*Here add fcs to one frame*/
+static void add_fcs_to_frame(Frame *p_frame) {
+
+    short seq[1024];
+    int size = 0;
+    int i;
+    int non_zero = 0;
+
+    convert_frame_to_seq(p_frame, seq, &size);
+
+    seq_fcs(seq, size);
+
+    for (i = 0; i < sizeof(crc)/sizeof(short) - 1; ++i) {
+        p_frame ->fcs[i] = seq[size - (sizeof(crc)/sizeof(short) - 1) + i];
+    }
+}
+
+
+static void convert_decimal_2_binary(int decimal, short binary[]) {
+
+    binary[2] = decimal % 2;
+    binary[0] = decimal / 4;
+    binary[1] = (decimal - binary[0] * 4) / 2;
+}
+
+/*Here create SABME, UA and DISC.*/
+Frame create_unnumbered_frame(short addr[], enum FRAME_TYPE ft, bool p_f) {
+
+    Frame f;
+    short s1[] = {1, 1, 0, 1, 1, 0};/* For SABME*/
+    short s2[] = {0, 0, 0, 1, 1, 0};/* For UA*/
+    short s3[] = {0, 0, 0, 0, 1, 0};/* For DISC*/
+    int i;
+
+    create_generic_unnumbered_frame(&f);
+
+    for (i = 0; i < 8; ++i) {
+        f.address[i] = addr[i];
+    }
+
+    switch(ft) {
+        case SABME :
+            for (i = 2; i < 8; ++i) {
+                f.control[i] = s1[i - 2];
+            }
+            break;
+
+        case UA :
+            for (i = 2; i < 8; ++i) {
+                f.control[i] = s2[i - 2];
+            }
+            break;
+
+        case DISC :
+            for (i = 2; i < 8; ++i) {
+                f.control[i] = s3[i - 2];
+            }
+            break;
+        default : fprintf(stderr, "Call create unnumbered frame error!\n");
+
+            break;
+    }
+
+    f.control[4] = p_f;
+
+    add_fcs_to_frame(&f);
+    return f;
+}
+
+Frame create_sup_frame(short addr[], enum FRAME_TYPE ft, bool p_f, short want_receive) {
+    Frame f;
+    int i;
+    short next_receive[3];
+    create_generic_sup_frame(&f);
+
+    for (i = 0; i < 8; ++i) {
+        f.address[i] = addr[i];
+    }
+
+    f.control[2] = 0;
+    switch(ft) {
+        case RR :
+            f.control[3] = 0;
+            break;
+        case REJ :
+            f.control[3] = 1;
+            break;
+        default :
+            fprintf(stderr, "create sup frame error!\n");
+            break;
+    }
+    f.control[4] = p_f;
+
+
+    convert_decimal_2_binary(want_receive, next_receive);
+    for (i = 5; i < 8; ++i) {
+        f.control[i] = next_receive[i - 5];
+    }
+
+    add_fcs_to_frame(&f);
+    return f;
+}
+
+
+
+/* prequestic : ($end - $start) % $raw_data_length = 0*/
+Frame* create_infor_frames(short addr[], short send_n, bool p_f, short receive_n,
+                           short data[], int start, int end, Frame *frames) { /*Normal data transferring.*/
+
+    Frame f;
+    int i;
+    int j;
+    int k;
+    int ite = 0;
+    short receive_number[3];
+    short send_number[3];
+
+    if ((end -start + 1) > (850 * window_length)) {
+        fprintf(stderr, "One frame takes too long data!\n");
+        return &f;
+    }
+
+    convert_decimal_2_binary(receive_n, receive_number);
+
+    for (ite = 0; ite < ((end - start) / raw_data_length); ++ite) {
+
+        create_generic_info_frame(&f);
+        convert_decimal_2_binary(send_n, send_number);
+        for (i = 1; i < 4; ++i) {
+
+            f.control[i] = send_number[i - 1];
+            f.control[i + 4] = receive_number[i - 1];
+        }
+
+        send_n = (send_n + 1) % frame_number_range;
+        f.control[4] = p_f;
+
+        j = 0;
+        k = 0;
+
+
+        /*bit stuffing!*/
+        for (i = start + ite * raw_data_length; i < start + (ite + 1) * raw_data_length; ++i) {
+
+            f.s.information[k] = data[i]; f.s.infor_type[k] = 1; ++k;  ++f.s.size;
+            if (1 == data[i]) {
+                if (4 == (i - j)) {
+                    f.s.information[k] = 0; f.s.infor_type[k] = 0; ++k;  ++f.s.size;
+                    j = i + 1;
+                }
+            } else {
+                j = i + 1;
+            }
+        }
+
+        add_fcs_to_frame(&f);
+        frames[ite] = f;
+    }
+    return frames;
+}
+
+short unnumbered[][8] = {
+        {1, 1, 1, 1, 0, 1, 1, 0}, /*SABME*/
+        {1, 1, 0, 0, 0, 1, 1, 0}, /*UA*/
+        {1, 1, 0, 0, 0, 0, 1, 0} /*DISC*/  };
+
+enum FRAME_TYPE get_frame_type(Frame *p_frame) {
+
+    if (0 == p_frame ->control[0]) {
+        return INFOR;
+    }
+
+    if (0 == p_frame ->control[1]) {
+        if (0 == p_frame ->control[3]) return RR;
+        else return REJ;
+    } else {
+        if (1 == p_frame ->control[2]) return SABME;
+        else {
+            if (1 == p_frame ->control[5]) return UA;
+            else return DISC;
+        }
+    }
+
+    fprintf(stdout, "Inteprete Frame type error!\n");
+    return INFOR;
+}
+
+void get_address(Frame *p_frame, short *storage) {
+
+    int i;
+    for (i = 0; i < 8; ++i) {
+        storage[i] = p_frame ->address[i];
+    }
+}
+
+/* Only for INFOR, */
+short get_send_number(Frame *p_frame) {
+
+    int num;
+    num = p_frame ->control[1] * 4 + p_frame ->control[2] * 2 + p_frame ->control[3];
+    return num;
+}
+/* For INFOR, RR, REJ.*/
+short get_expect_number(Frame *p_frame) {
+
+    int num;
+    num = p_frame ->control[5] * 4 + p_frame ->control[6] * 2 + p_frame ->control[7];
+    return num;
+}
+
+/* Only for INFOR.*/
+void get_infor(Frame *p_frame, short *storage, int *size) {
+    int i;
+    *size = 0;
+
+    for (i = 0; i < p_frame ->s.size; ++i) {
+        if (1 == p_frame ->s.infor_type[i]) {
+            storage[*size] = p_frame ->s.information[i];
+            ++(*size);
+        }
+    }
+}
+
+/*Here using fcs to judge whether the data is right.*/
+bool is_fcs_right(Frame *p_frame) {
+
+    short seq[1024];
+    int size = 0;
+    int non_zero;
+    int i;
+
+    convert_frame_to_seq(p_frame, seq, &size);
+
+    non_zero = seq_fcs(seq, size);
+    if (-1 == non_zero) {
+        return 1;
+    }
+
+    return 0;
+}

frame.h

@@ -0,0 +1,57 @@
+#ifndef _FRAME_H
+#define _FRAME_H
+
+typedef int bool;
+
+/*This is the frame structure in HDLC.*/
+typedef struct Frame {
+
+    short  head_flag[8];
+    short address[8];
+    short control[8];
+    struct{
+
+        /*Actuall size should also be arry. It is also sequence of '01', here I simplify it.*/
+        short size; /*Record the real length of the data.*/
+        short information[1024];/*Capacity is 1024.*/
+        short infor_type[1024]; /*0 : bit stuffing; 1 : real data.*/
+    }s;
+
+    short fcs[32];
+    short rail_flag[8];
+}Frame;
+
+enum FRAME_TYPE {SABME, DISC, UA, REJ, RR, INFOR};
+
+/* SABME, UA and DISC*/
+Frame create_unnumbered_frame(short addr[], enum FRAME_TYPE ft, bool p_f);
+
+/* REJ, RR*/
+Frame create_sup_frame(short addr[], enum FRAME_TYPE ft, bool p_f, short next_receive);
+
+/* Frame for normal data transferring.*/
+Frame* create_infor_frames(short addr[], short send_number, bool p_f,
+                           short receive_number, short data[], int start, int end, Frame *frames);/* Using $start,$end, better than $size*/
+
+/*Extract frame type from the given frame. */
+enum FRAME_TYPE get_frame_type(Frame *p_frame);
+
+
+/* Extract address field from the given frame.*/
+void get_address(Frame *p_frame, short *storage);
+
+/* The # of the frame.*/
+short get_send_number(Frame *p_frame);
+
+/* The # of the frame sender wants.*/
+short get_expect_number(Frame *p_frame);
+
+/* Extract the real data from the given frame.*/
+void get_infor(Frame *p_frame, short *storage, int *size);
+
+
+/*Here using fcs to judge whether the data is right.*/
+bool is_fcs_right(Frame *p_frame);
+
+
+#endif

hdlc/client.c

@@ -1,123 +0,0 @@
-#include "client.h"
-#include "hdlc.h"
-#include "stdio.h"
-
-#define ERR_INVALID_DATA_SIZE -1
-#define ERR_ALL_BUFFERS_FILL -2
-#define ERR_INVALID_PARAMS -3
-#define ERR_INVALID_STATE -4
-#define ERR_FRAME_TIME_OUT -5
-#define ERR_INVALID_SEQ_NUMBER_FRAME -6
-#define ERR_TIMEOUT_ANSWER -7
-
-#define SIZE_DATA_BUFFERS 64
-
-int connecting_frame_timeout_bf;
-
-void init_hdlc_client(struct Client* client, int connecting_frame_timeout){
-    client->state = IDLE_STATE;
-    client->connecting_frame_timeout = connecting_frame_timeout;
-    connecting_frame_timeout_bf = connecting_frame_timeout;
-
-    client->current_state_hdlc.control_escape = 0;
-    client->current_state_hdlc.fcs = FCS_INIT_VALUE;
-    client->current_state_hdlc.start_index = -1;
-    client->current_state_hdlc.end_index = -1;
-    client->current_state_hdlc.src_index = 0;
-    client->current_state_hdlc.dest_index = 0;
-}
-
-void connect(struct Client* client, hdlc_control_t* frame){
-    client->state = CONNECTING;
-
-    client->frameS.seq_no = 0;
-    client->frameS.frame = S_FRAME;
-
-    *frame = client->frameS;
-
-//    if (client->frame1.seq_no == -4){
-//        client->frame1.seq_no = 0;
-//        client->frame1.frame = S_FRAME;
-//
-//        *frame = client->frame1;
-//    } else if (client->frame1.seq_no == -4){
-//        client->frame1.seq_no = 0;
-//        client->frame1.frame = S_FRAME;
-//
-//        *frame = client->frame1;
-//    }
-}
-
-int send_data(struct Client* client, hdlc_control_t* frame, uint8_t* data, size_t data_len){
-    if (client->state != READY_STATE){
-        return ERR_INVALID_STATE;
-    }
-
-    client->state = RECIVING;
-
-    if (SIZE_DATA_BUFFERS < data_len){
-        return ERR_INVALID_DATA_SIZE;
-    }
-
-    client->frameI.seq_no = 0;
-    client->frameI.frame = I_FRAME;
-    client->data_i_frame = *data;
-    client->len_data_i_frame = data_len;
-
-    *frame = client->frameI;
-
-    client->state = RECIVING;
-};
-
-int hdlc_get_raw_frame(struct Client *client, hdlc_control_t* frame, uint8_t buffer[], size_t lenBuffer) {
-    if (frame->frame = S_FRAME){
-        int ret = hdlc_frame_data(frame, NULL, 0, buffer, &lenBuffer);
-        if (ret < 0){
-            printf("err in get_frame: %d\n", ret);
-        }
-    } else {
-        int ret = hdlc_frame_data(frame, &client->data_i_frame,
-                                  client->len_data_i_frame, buffer, &lenBuffer);
-        if (ret < 0){
-            printf("err in get_frame: %d\n", ret);
-        }
-    }
-
-    return 0;
-}
-
-int hdlc_decode_recived_raw_data(struct Client* client, uint8_t buffer[], size_t len_buffer){
-    hdlc_control_t recv_control;
-    uint8_t recive[len_buffer];
-
-    int ret = hdlc_get_data_with_state(&client->current_state_hdlc, &recv_control, buffer, len_buffer, recive,
-                            &len_buffer);
-
-    if (ret < 0) {
-        return ret;
-    }
-
-    switch (recv_control.frame) {
-        case S_FRAME:
-            client->state = READY_STATE;
-            break;
-        case I_FRAME:
-            break;
-        case S_FRAME_NACK:
-            client->state = DISCONNECTING;
-            client->frame_rej.seq_no = 0;
-            client->frame_rej.frame = S_FRAME_NACK;
-            break;
-    }
-
-    client->connecting_frame_timeout = connecting_frame_timeout_bf;
-    return 0;
-}
-
-int hdlc_timeout_handler(struct Client* client, int delta_time){
-    client->connecting_frame_timeout -= delta_time;
-
-    if (client->connecting_frame_timeout <= 0){
-        return ERR_FRAME_TIME_OUT;
-    }
-}

hdlc/client.h

@@ -1,39 +0,0 @@
-#ifndef CLIENT_H
-#define CLIENT_H
-
-#include <stdint.h>
-#include <stdbool.h>
-#include "hdlc.h"
-
-enum HDLCState {
-    UNINITIALIZED_STATE = 0,  // состояние до инцилизации
-    IDLE_STATE, // Состояние ожидания начала
-    READY_STATE, // Состояние принятия
-    CONNECTING, // состояние соединения
-    DISCONNECTING, // состояния отключения
-    RECIVING // состояние приема и отправки
-};
-
-struct Client{
-    enum HDLCState state;
-    int connecting_frame_timeout; //-1
-    hdlc_state_t current_state_hdlc;
-    hdlc_control_t frameS;
-    hdlc_control_t frameI;
-    uint8_t data_i_frame;
-    size_t len_data_i_frame;
-//    hdlc_control_t frame3;
-//    hdlc_control_t frame4;
-    hdlc_control_t frame_rej;
-};
-
-//название функций
-void init_hdlc_client(struct Client* client, int connecting_frame_timeout);
-void connect(struct Client* client, hdlc_control_t* frame);
-int send_data(struct Client* client, hdlc_control_t* frame, uint8_t* data, size_t data_len);
-int hdlc_get_raw_frame(struct Client *client, hdlc_control_t* frame, uint8_t buffer[], size_t lenBuffer);
-//принимает буффер с уарта
-int hdlc_decode_recived_raw_data(struct Client* client, uint8_t buffer[], size_t len_buffer);
-int hdlc_timeout_handler(struct Client* client, int delta_time);
-
-#endif //CLIENT_H

hdlc/fcs.c

@@ -1,41 +0,0 @@
-#include "fcs.h"
-
-/*
- *    CRC-Type:     CRC16 CCIT
- *    Polynomial:   0x1021 (x^16+x^12+x^5+1)
- *    Lookup Table: Reflected
- */
-static const unsigned short fcstab[256] = {
-        0x0000, 0x1189, 0x2312, 0x329b,
-        0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c,
-        0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c,
-        0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff,
-        0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
-        0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183,
-        0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42,
-        0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116,
-        0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7,
-        0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1,
-        0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960,
-        0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630,
-        0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
-        0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf,
-        0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581,
-        0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52,
-        0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612,
-        0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5,
-        0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7,
-        0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74,
-        0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
-        0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c,
-        0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd,
-        0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f,
-        0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e,
-        0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a,
-        0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb,
-        0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9,
-        0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 };
-
-FCS_SIZE calc_fcs(FCS_SIZE fcs, unsigned char value) {
-    return (fcs >> 8) ^ fcstab[(fcs ^ value) & 0xff];
-}

hdlc/fcs.h

@@ -1,18 +0,0 @@
-#ifndef FCS_H
-#define FCS_H
-
-#define FCS_INIT_VALUE 0xFFFF /* FCS initialization value. */
-#define FCS_GOOD_VALUE 0xF0B8 /* FCS value for valid frames. */
-#define FCS_INVERT_MASK 0xFFFF /* Invert the FCS value accordingly to the specification */
-#define FCS_SIZE unsigned short
-
-/**
- * Calculates a new FCS based on the current value and value of data.
- *
- * @param fcs Current FCS value
- * @param value The value to be added
- * @returns Calculated FCS value
- */
-FCS_SIZE calc_fcs(FCS_SIZE fcs, unsigned char value);
-
-#endif

hdlc/hdlc.c

@@ -1,261 +0,0 @@
-#include "hdlc.h"
-
-// HDLC Control field bit positions
-#define HDLC_CONTROL_S_OR_U_FRAME_BIT 0
-#define HDLC_CONTROL_SEND_SEQ_NO_BIT 1
-#define HDLC_CONTROL_S_FRAME_TYPE_BIT 2
-#define HDLC_CONTROL_POLL_BIT 4
-#define HDLC_CONTROL_RECV_SEQ_NO_BIT 5
-
-// HDLC Control type definitions
-#define HDLC_CONTROL_TYPE_RECEIVE_READY 0
-#define HDLC_CONTROL_TYPE_RECEIVE_NOT_READY 1
-#define HDLC_CONTROL_TYPE_REJECT 2
-#define HDLC_CONTROL_TYPE_SELECTIVE_REJECT 3
-
-static hdlc_state_t hdlc_state = {
-        .control_escape = 0,
-        .fcs = FCS_INIT_VALUE,
-        .start_index = -1,
-        .end_index = -1,
-        .src_index = 0,
-        .dest_index = 0,
-};
-
-int hdlc_set_state(hdlc_state_t *state) {
-    if (!state) {
-        return -EINVAL;
-    }
-
-    hdlc_state = *state;
-    return 0;
-}
-
-
-int hdlc_get_state(hdlc_state_t *state) {
-    if (!state) {
-        return -EINVAL;
-    }
-
-    *state = hdlc_state;
-    return 0;
-}
-
-void hdlc_escape_value(char value, char *dest, int *dest_index) {
-    // Check and escape the value if needed
-    if ((value == HDLC_FLAG_SEQUENCE) || (value == HDLC_CONTROL_ESCAPE)) {
-        dest[(*dest_index)++] = HDLC_CONTROL_ESCAPE;
-        value ^= 0x20;
-    }
-
-    // Add the value to the destination buffer and increment destination index
-    dest[(*dest_index)++] = value;
-}
-
-hdlc_control_t hdlc_get_control_type(unsigned char control) {
-    hdlc_control_t value;
-
-    // Check if the frame is a S-frame (or U-frame)
-    if (control & (1 << HDLC_CONTROL_S_OR_U_FRAME_BIT)) {
-        // Check if S-frame type is a Receive Ready (ACK)
-        if (((control >> HDLC_CONTROL_S_FRAME_TYPE_BIT) & 0x3)
-            == HDLC_CONTROL_TYPE_RECEIVE_READY) {
-            value.frame = S_FRAME;
-        } else {
-            // Assume it is an NACK since Receive Not Ready, Selective Reject and U-frames are not supported
-            value.frame = S_FRAME_NACK;
-        }
-
-        // Add the receive sequence number from the S-frame (or U-frame)
-        value.seq_no = (control >> HDLC_CONTROL_RECV_SEQ_NO_BIT);
-    } else {
-        // It must be an I-frame so add the send sequence number (receive sequence number is not used)
-        value.frame = I_FRAME;
-        value.seq_no = (control >> HDLC_CONTROL_SEND_SEQ_NO_BIT);
-    }
-
-    return value;
-}
-
-unsigned char hdlc_frame_control_type(hdlc_control_t *control) {
-    unsigned char value = 0;
-
-    switch (control->frame) {
-        case I_FRAME:
-            // Create the HDLC I-frame control byte with Poll bit set
-            value |= (control->seq_no << HDLC_CONTROL_SEND_SEQ_NO_BIT);
-            value |= (1 << HDLC_CONTROL_POLL_BIT);
-            break;
-        case S_FRAME:
-            // Create the HDLC Receive Ready S-frame control byte with Poll bit cleared
-            value |= (control->seq_no << HDLC_CONTROL_RECV_SEQ_NO_BIT);
-            value |= (1 << HDLC_CONTROL_S_OR_U_FRAME_BIT);
-            break;
-        case S_FRAME_NACK:
-            // Create the HDLC Receive Ready S-frame control byte with Poll bit cleared
-            value |= (control->seq_no << HDLC_CONTROL_RECV_SEQ_NO_BIT);
-            value |= (HDLC_CONTROL_TYPE_REJECT << HDLC_CONTROL_S_FRAME_TYPE_BIT);
-            value |= (1 << HDLC_CONTROL_S_OR_U_FRAME_BIT);
-            break;
-    }
-
-    return value;
-}
-
-void hdlc_get_data_reset() {
-    hdlc_get_data_reset_with_state(&hdlc_state);
-}
-
-void hdlc_get_data_reset_with_state(hdlc_state_t *state) {
-    state->fcs = FCS_INIT_VALUE;
-    state->start_index = state->end_index = -1;
-    state->src_index = state->dest_index = 0;
-    state->control_escape = 0;
-}
-
-//int hdlc_get_data(hdlc_control_t *control, const char *src,
-//                    unsigned int src_len, char *dest, unsigned int *dest_len)
-int hdlc_get_data(hdlc_control_t *control, uint8_t *src,
-                  size_t src_len, uint8_t *dest, size_t *dest_len){
-    return hdlc_get_data_with_state(&hdlc_state, control, src, src_len, dest, dest_len);
-}
-
-//int hdlc_get_data_with_state(hdlc_state_t *state, hdlc_control_t *control, const char *src,
-//                               unsigned int src_len, char *dest, unsigned int *dest_len)
-int hdlc_get_data_with_state(hdlc_state_t *state, hdlc_control_t *control, uint8_t *src,
-                             size_t src_len, uint8_t *dest, size_t *dest_len){
-    int ret;
-    char value;
-    unsigned int i;
-
-    // Make sure that all parameters are valid
-    if (!state || !control || !src || !dest || !dest_len) {
-        return -EINVAL;
-    }
-
-    // Run through the data bytes
-    for (i = 0; i < src_len; i++) {
-        // First find the start flag sequence
-        if (state->start_index < 0) {
-            if (src[i] == HDLC_FLAG_SEQUENCE) {
-                // Check if an additional flag sequence byte is present
-                if ((i < (src_len - 1)) && (src[i + 1] == HDLC_FLAG_SEQUENCE)) {
-                    // Just loop again to silently discard it (accordingly to HDLC)
-                    continue;
-                }
-
-                state->start_index = state->src_index;
-            }
-        } else {
-            // Check for end flag sequence
-            if (src[i] == HDLC_FLAG_SEQUENCE) {
-                // Check if an additional flag sequence byte is present or earlier received
-                if (((i < (src_len - 1)) && (src[i + 1] == HDLC_FLAG_SEQUENCE))
-                    || ((state->start_index + 1) == state->src_index)) {
-                    // Just loop again to silently discard it (accordingly to HDLC)
-                    continue;
-                }
-
-                state->end_index = state->src_index;
-                break;
-            } else if (src[i] == HDLC_CONTROL_ESCAPE) {
-                state->control_escape = 1;
-            } else {
-                // Update the value based on any control escape received
-                if (state->control_escape) {
-                    state->control_escape = 0;
-                    value = src[i] ^ 0x20;
-                } else {
-                    value = src[i];
-                }
-
-                // Now update the FCS value
-                state->fcs = calc_fcs(state->fcs, value);
-
-                if (state->src_index == state->start_index + 2) {
-                    // Control field is the second byte after the start flag sequence
-                    *control = hdlc_get_control_type(value);
-                } else if (state->src_index > (state->start_index + 2)) {
-                    // Start adding the data values after the Control field to the buffer
-                    dest[state->dest_index++] = value;
-                }
-            }
-        }
-        state->src_index++;
-    }
-
-    // Check for invalid frame (no start or end flag sequence)
-    if ((state->start_index < 0) || (state->end_index < 0)) {
-        // Return no message and make sure destination length is 0
-        *dest_len = 0;
-        ret = -ENOMSG;
-    } else {
-        // A frame is at least 4 bytes in size and has a valid FCS value
-        if ((state->end_index < (state->start_index + 4))
-            || (state->fcs != FCS_GOOD_VALUE)) {
-            // Return FCS error and indicate that data up to end flag sequence in buffer should be discarded
-            *dest_len = i;
-            ret = -EIO;
-        } else {
-            // Return success and indicate that data up to end flag sequence in buffer should be discarded
-            *dest_len = state->dest_index - sizeof(state->fcs);
-            ret = i;
-        }
-
-        // Reset values for next frame
-        hdlc_get_data_reset_with_state(state);
-    }
-
-    return ret;
-}
-
-//int hdlc_frame_data(hdlc_control_t *control, const char *src,
-//                      unsigned int src_len, char *dest, unsigned int *dest_len)
-int hdlc_frame_data(hdlc_control_t *control, uint8_t *src,
-                    size_t src_len, uint8_t *dest, size_t *dest_len){
-    unsigned int i;
-    int dest_index = 0;
-    unsigned char value = 0;
-    FCS_SIZE fcs = FCS_INIT_VALUE;
-
-    // Make sure that all parameters are valid
-    if (!control || (!src && (src_len > 0)) || !dest || !dest_len) {
-        return -EINVAL;
-    }
-
-    // Start by adding the start flag sequence
-    dest[dest_index++] = HDLC_FLAG_SEQUENCE;
-
-    // Add the all-station address from HDLC (broadcast)
-    fcs = calc_fcs(fcs, HDLC_ALL_STATION_ADDR);
-    hdlc_escape_value(HDLC_ALL_STATION_ADDR, dest, &dest_index);
-
-    // Add the framed control field value
-    value = hdlc_frame_control_type(control);
-    fcs = calc_fcs(fcs, value);
-    hdlc_escape_value(value, dest, &dest_index);
-
-    // Only DATA frames should contain data
-    if (control->frame == I_FRAME) {
-        // Calculate FCS and escape data
-        for (i = 0; i < src_len; i++) {
-            fcs = calc_fcs(fcs, src[i]);
-            hdlc_escape_value(src[i], dest, &dest_index);
-        }
-    }
-
-    // Invert the FCS value accordingly to the specification
-    fcs ^= FCS_INVERT_MASK;
-
-    // Run through the FCS bytes and escape the values
-    for (i = 0; i < sizeof(fcs); i++) {
-        value = ((fcs >> (8 * i)) & 0xFF);
-        hdlc_escape_value(value, dest, &dest_index);
-    }
-
-    // Add end flag sequence and update length of frame
-    dest[dest_index++] = HDLC_FLAG_SEQUENCE;
-    *dest_len = dest_index;
-
-    return 0;
-}

hdlc/hdlc.h

@@ -1,126 +0,0 @@
-//
-// Created by 79513 on 15.12.2023.
-//
-
-#ifndef HDLC_H
-#define HDLC_H
-
-#include "fcs.h"
-#include <errno.h>
-#include "stdint.h"
-
-/** HDLC start/end flag sequence */
-#define HDLC_FLAG_SEQUENCE 0x7E
-
-/** HDLC control escape value */
-#define HDLC_CONTROL_ESCAPE 0x7D
-
-/** HDLC all station address */
-#define HDLC_ALL_STATION_ADDR 0xFF
-
-/** Supported HDLC frame types */
-typedef enum {
-    I_FRAME,
-    S_FRAME,
-    S_FRAME_NACK,
-} hdlc_frame_t;
-
-/** Control field information */
-typedef struct {
-    hdlc_frame_t frame;
-    unsigned char seq_no :3;
-} hdlc_control_t;
-
-/** Variables used in hdlc_get_data and hdlc_get_data_with_state
- * to keep track of received buffers
- */
-typedef struct {
-    char control_escape;
-    FCS_SIZE fcs;
-    int start_index;
-    int end_index;
-    int src_index;
-    int dest_index;
-} hdlc_state_t;
-
-/**
- * Set the hdlc state
- *
- * @param[in] state The new hdlc state to be used
- * @retval 0 Success
- * @retval -EINVAL Invalid parameter
- */
-int hdlc_set_state(hdlc_state_t *state);
-
-/**
- * Get current hdlc state
- *
- * @param[out] state Current hdlc state
- * @retval 0 Success
- * @retval -EINVAL Invalid parameter
- */
-int hdlc_get_state(hdlc_state_t *state);
-
-/**
- * Retrieves data from specified buffer containing the HDLC frame. Frames can be
- * parsed from multiple buffers e.g. when received via UART.
- *
- * @param[out] control Control field structure with frame type and sequence number
- * @param[in] src Source buffer with frame
- * @param[in] src_len Source buffer length
- * @param[out] dest Destination buffer (should be able to contain max frame size)
- * @param[out] dest_len Destination buffer length
- * @retval >=0 Success (size of returned value should be discarded from source buffer)
- * @retval -EINVAL Invalid parameter
- * @retval -ENOMSG Invalid message
- * @retval -EIO Invalid FCS (size of dest_len should be discarded from source buffer)
- *
- * @see hdlc_get_data_with_state
- */
-int hdlc_get_data(hdlc_control_t *control, uint8_t *src,
-                    size_t src_len, uint8_t *dest, size_t *dest_len);
-
-/**
- * Retrieves data from specified buffer containing the HDLC frame. Frames can be
- * parsed from multiple buffers e.g. when received via UART.
- *
- * This function is a variation of @ref hdlc_get_data
- * The difference is only in first argument: hdlc_state_t *state
- * Data under that pointer is used to keep track of internal buffers.
- *
- * @see hdlc_get_data
- */
-int hdlc_get_data_with_state(hdlc_state_t *state, hdlc_control_t *control, uint8_t *src,
-                             size_t src_len, uint8_t *dest, size_t *dest_len);
-
-/**
- * Resets values used in yahdlc_get_data function to keep track of received buffers
- */
-void hdlc_get_data_reset();
-
-/**
- * This is a variation of @ref hdlc_get_data_reset
- * Resets state values that are under the pointer provided as argument
- *
- * This function need to be called before the first call to hdlc_get_data_with_state
- * when custom state storage is used.
- *
- * @see hdlc_get_data_reset
- */
-void hdlc_get_data_reset_with_state(hdlc_state_t *state);
-
-/**
- * Creates HDLC frame with specified data buffer.
- *
- * @param[in] control Control field structure with frame type and sequence number
- * @param[in] src Source buffer with data
- * @param[in] src_len Source buffer length
- * @param[out] dest Destination buffer (should be bigger than source buffer)
- * @param[out] dest_len Destination buffer length
- * @retval 0 Success
- * @retval -EINVAL Invalid parameter
- */
-int hdlc_frame_data(hdlc_control_t *control, uint8_t *src,
-                      size_t src_len, uint8_t *dest, size_t *dest_len);
-
-#endif //HDLC_H

hdlc/main.c

@@ -1,179 +0,0 @@
-//#include "hdlc.h"
-#include "stdio.h"
-#include "client.h"
-#include <stdlib.h>
-#include <inttypes.h>
-
-int main(){
-    struct Client hdlc;
-    init_hdlc_client(&hdlc, 200);
-    hdlc_control_t frame;
-    connect(&hdlc, &frame);
-    uint8_t buffer_for_ex[25];
-    uint8_t fake_buffer[2];
-    hdlc_get_raw_frame(&hdlc, &frame, buffer_for_ex, sizeof(buffer_for_ex));
-
-    for (int i = 0; i < 200; i++){
-        int z = hdlc_timeout_handler(&hdlc, 1);
-        if (z < 0){
-            printf("%d\n", z);
-        }
-        hdlc_decode_recived_raw_data(&hdlc, fake_buffer, sizeof(fake_buffer));
-    }
-
-    hdlc_get_raw_frame(&hdlc, &frame, buffer_for_ex, sizeof(buffer_for_ex));
-    int i = hdlc_decode_recived_raw_data(&hdlc, buffer_for_ex, sizeof(buffer_for_ex));
-    printf("%d\n", i);
-
-    hdlc_control_t frame_data;
-    uint8_t data = 003;
-    send_data(&hdlc, &frame_data, &data, sizeof(data));
-    uint8_t buffer_for_ex_data[128];
-
-    hdlc_get_raw_frame(&hdlc, &frame_data, buffer_for_ex_data, sizeof(buffer_for_ex_data));
-
-    i = hdlc_decode_recived_raw_data(&hdlc, buffer_for_ex_data, sizeof(buffer_for_ex_data));
-    printf("%d\n", i);
-
-
-
-//    uint8_t send[64];
-//    uint8_t buffer[134];
-//    for (int i = 0; i < sizeof(send); i++) {
-//        send[i] = (uint8_t) (rand() % 0x70);
-//    }
-//    send_data(&hdlc, send, sizeof(send_data));
-//    //get_frame(&hdlc, buffer, sizeof(buffer), send_data, sizeof(send_data));
-//
-//    hdlc_get_raw_data(&hdlc, buffer, sizeof(buffer));
-
-    // test 1
-
-//    int ret;
-//    uint8_t frame_data[8], recv_data[8];
-//    size_t i, frame_length = 0, recv_length = 0;
-//    hdlc_control_t control_send, control_recv;
-
-//    // Run through the supported sequence numbers (3-bit)
-//    for (i = 0; i <= 7; i++) {
-//        // Initialize the control field structure with frame type and sequence number
-//        control_send.frame = HDLC_FRAME_ACK;
-//        control_send.seq_no = i;
-//
-//        // Create an empty frame with the control field information
-//        ret = hdlc_frame_data(&control_send, NULL, 0, frame_data, &frame_length);
-//
-//        // Get the data from the frame
-//        ret = hdlc_get_data(&control_recv, frame_data, frame_length, recv_data,
-//                              &recv_length);
-//
-//        // Result should be frame_length minus start flag to be discarded and no bytes received
-//        if(ret != (int )frame_length - 1){
-//            printf("err");
-//        }
-//    }
-//    if (recv_length != 0){
-//        printf("err2");
-//    }
-//
-//    if (control_send.frame != control_recv.frame){
-//        printf("err3");
-//    }
-//
-//    if (control_send.seq_no != control_recv.seq_no){
-//        printf("err4");
-//    }
-
-    // test 2
-
-    // Run through the supported sequence numbers (3-bit)
-//    for (i = 0; i <= 7; i++) {
-//        // Initialize the control field structure with frame type and sequence number
-//        control_send.frame = HDLC_FRAME_DATA;
-//        control_send.seq_no = i;
-//
-//        char* input = "311";
-//        uint8_t data = (uint8_t)atoi(input);
-//
-//        // Create an empty frame with the control field information
-//        ret = hdlc_frame_data(&control_send, &data, 3, frame_data, &frame_length);
-//        if (ret != 0){
-//            printf("err123\n");
-//        }
-//
-//        // Get the data from the frame
-//        ret = hdlc_get_data(&control_recv, frame_data, frame_length, recv_data,
-//                            &recv_length);
-//
-//        // Result should be frame_length minus start flag to be discarded and no bytes received
-//        if(ret != (int )frame_length - 1){
-//            printf("err333\n");
-//        }
-//        if (recv_length != 0){
-//            printf("err2\n");
-//        }
-//
-//        // Verify the control field information
-//        if (control_send.frame != control_recv.frame){
-//            printf("err3\n");
-//        }
-//
-//        if (control_send.seq_no != control_recv.seq_no){
-//            printf("err4\n");
-//        }
-//    }
-
-//    int ret;
-//    hdlc_control_t control;
-//    uint8_t send_data[512], frame_data[530], recv_data[530];
-//    size_t i, frame_length = 0, recv_length = 0, buf_length = 16;
-//
-//    // Initialize data to be send with random values (up to 0x70 to keep below the values to be escaped)
-//    for (i = 0; i < sizeof(send_data); i++) {
-//        send_data[i] = (uint8_t) (rand() % 0x70);
-//    }
-//
-//    // Initialize control field structure and create frame
-//    control.frame = HDLC_FRAME_DATA;
-//    ret = hdlc_frame_data(&control, send_data, sizeof(send_data), frame_data,
-//                            &frame_length);
-//
-//    // Check that frame length is maximum 2 bytes larger than data due to escape of FCS value
-//    if(frame_length >= ((sizeof(send_data) + 6) + 2)){
-//        printf("1");
-//    }
-//    if(ret != 0){
-//        printf("2");
-//    }
-//
-//    // Run though the different buffers (simulating decode of buffers from UART)
-//    for (i = 0; i <= sizeof(send_data); i += buf_length) {
-//        // Decode the data
-//        ret = hdlc_get_data(&control, &frame_data[i], buf_length, recv_data,
-//                              &recv_length);
-//
-//        printf("%zu: %s\n", i, recv_data);
-//
-//        if (i < sizeof(send_data)) {
-//            // All chunks until the last should return no message and zero length
-//            if (ret != -ENOMSG){
-//                printf("3");
-//            }
-//            if (recv_length != 0){
-//                printf("1231");
-//            }
-//        } else {
-//            if (ret > 7){
-//                printf("332");
-//            }
-//            if (recv_length != sizeof(send_data)){
-//                printf("88888");
-//            }
-//            // The last chunk should return max 6 frame bytes - 1 start flag sequence byte + 2 byte for the possible
-//            // escaped FCS = 7 bytes
-////            BOOST_CHECK(ret <= 7);
-////            BOOST_CHECK_EQUAL(recv_length, sizeof(send_data));
-//            //printf("5");
-//        }
-//    }
-}

i2cmaster.h

@@ -0,0 +1,42 @@
+#ifndef _I2CMASTER_H
+#define _I2CMASTER_H
+
+// флаг, отвечающий за чтение данных по i2c
+#define I2C_READ    1
+
+// флаг, отвечающий за отправку данных по i2c
+#define I2C_WRITE   0
+
+// частота тактирования линии в Герцах
+#define SCL_CLOCK 100000L
+
+// инициализация интерфейса
+void i2c_init(void);
+
+// передача условия СТОП на шину
+void i2c_stop(void);
+
+// передача условия СТАРТ на шину
+unsigned char i2c_start(unsigned char addr);
+
+// повторный старт(перезапуск)
+unsigned char i2c_rep_start(unsigned char addr);
+
+// ждем, если устрой-во занято, а потом передаем условие СТАРТ на шину
+void i2c_start_wait(unsigned char addr);
+
+ // отправка данных
+unsigned char i2c_write(unsigned char data);
+
+// читаем данные и продолжаем вещание
+unsigned char i2c_readAck(void);
+
+// читаем данные и после их получения передаем услови СТОП
+unsigned char i2c_readNak(void);
+
+// читаем данные с шины
+unsigned char i2c_read(unsigned char ack);
+
+// выбираем какой варинт чтения данных будет
+#define i2c_read(ack)  (ack) ? i2c_readAck() : i2c_readNak(); 
+#endif

twimaster.cpp

@@ -0,0 +1,117 @@
+#include "MyLCD.h"
+
+// инициализация интерфейса i2c
+void i2c_init(void)
+{
+  // предделитель тактовой частоты равен 1 
+  TWSR = 0;     
+  // рассчет скорости передачи данных                   
+  TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
+}
+
+// передача условия СТАРТ на шину
+unsigned char i2c_start(unsigned char address)
+{
+    uint8_t   twst;
+	
+	// отправка условия СТАРТ
+	TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
+	// ожидание завершения передачи условия СТАРТ
+	while(!(TWCR & (1<<TWINT)));
+	// проверка значений регистра
+	twst = TW_STATUS & 0xF8;
+	if ( (twst != TW_START) && (twst != TW_REP_START)) return 1;
+	// отправка адреса устрой-ва
+	TWDR = address;
+	TWCR = (1<<TWINT) | (1<<TWEN);
+	// ожидание ответа от ведомого уст-ва
+	while(!(TWCR & (1<<TWINT)));
+	// проверка полученных значений
+	twst = TW_STATUS & 0xF8;
+	if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
+
+	return 0;
+
+}
+
+// ждем, если устрой-во занято, а потом передаем условие СТАРТ на шину
+void i2c_start_wait(unsigned char address)
+{
+    uint8_t   twst;
+
+    for(;;)
+    {
+	    // отправка условия СТАРТ
+	    TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
+    	// ожидание завершения передачи условия СТАРТ
+    	while(!(TWCR & (1<<TWINT)));
+    	// проверка значений регистра
+    	twst = TW_STATUS & 0xF8;
+    	if ( (twst != TW_START) && (twst != TW_REP_START)) continue;
+    	// отправка адреса устрой-ва
+    	TWDR = address;
+    	TWCR = (1<<TWINT) | (1<<TWEN);
+    	 // ожидание ответа от ведомого уст-ва
+    	while(!(TWCR & (1<<TWINT)));
+    	// проверка занято ли ведомое уст-во
+    	twst = TW_STATUS & 0xF8;
+    	if ( (twst == TW_MT_SLA_NACK )||(twst ==TW_MR_DATA_NACK) ) 
+    	{    	    
+    	    // устройство занято, отправьте условие остановки для прекращения операции записи
+	        TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
+	        // ждем освобождения шины
+	        while(TWCR & (1<<TWSTO));
+    	    continue;
+    	}
+    	break;
+     }
+}
+
+// тупа повторяем условие СТАРТ
+unsigned char i2c_rep_start(unsigned char address)
+{
+    return i2c_start(address);
+}
+
+// передача условия СТОП на шину
+void i2c_stop(void)
+{
+    // отправка условия СТОП
+	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
+	// ждем выполнения условия остановки
+	while(TWCR & (1<<TWSTO));
+}
+
+// отправка данных, если функция вернет 0, то все успешно, иначе нет
+unsigned char i2c_write( unsigned char data )
+{	
+    uint8_t   twst;
+    
+	// отправляем данные на уст-во
+	TWDR = data;
+	TWCR = (1<<TWINT) | (1<<TWEN);
+	// ждем завершения передачи
+	while(!(TWCR & (1<<TWINT)));
+	// записываем ответ от ведомого уст-ва
+	twst = TW_STATUS & 0xF8;
+	if( twst != TW_MT_DATA_ACK) return 1;
+	return 0;
+}
+
+// читаем данные и продолжаем вещание
+unsigned char i2c_readAck(void)
+{
+	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA);
+	while(!(TWCR & (1<<TWINT)));    
+
+    return TWDR;
+}
+
+// читаем данные и после их получения передаем услови СТОП
+unsigned char i2c_readNak(void)
+{
+	TWCR = (1<<TWINT) | (1<<TWEN);
+	while(!(TWCR & (1<<TWINT)));
+	
+    return TWDR;
+}