Готовая библиотека i2c

Reviewed-on: #6

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

client.c

@@ -1,125 +0,0 @@
-#include "client.h"
-
-#include <stdio.h>
-#include <fcntl.h>
-
-#define START_FLAG 0x7E
-#define END_FLAG 0x7E
-
-void init_Client(Client* client, bool test_is_valid, uint8_t address) {
-    client->TEST_IS_VALID = test_is_valid;
-    client->address = address;
-    client->_send_sequence_number = 0;
-    client->poll_final = 1;
-    client->_receive_sequence_number = 0;
-}
-
-
-void connect(Client* client) {
-    UFrame u_frame;
-    init_UFrame(&u_frame, client->address, client->poll_final, "BP", NULL, 0);
-
-    uint8_t result[256];
-    create_frame(&u_frame.base, result);
-
-
-    // Wait for acknowledgment frame
-    bool flag = true;
-    uint8_t data;
-    while(flag){
-        data = uart_read();
-        if (data > 0){
-            flag = false;
-        }
-    }
-
-    HDLCFrame frame;
-    init_HDLCFrame(&frame, 0, 0, &data + 3, 256 - 6);
-    if (validate(&data, 256)) {
-        return;
-    } else {
-        // Connection failed
-    }
-}
-
-void send(Client* client, uint8_t* data, size_t data_length) {
-    connect(client);
-
-    IFrame i_frame;
-    init_IFrame(&i_frame, client->address, client->_receive_sequence_number, client->poll_final, client->_send_sequence_number, data, data_length);
-
-    uint8_t result[256];
-    create_frame(&i_frame.base, result);
-
-    uart_send_byte(*i_frame.base.data);
-
-    client->_send_sequence_number++;
-}
-
-void receive_data(uint8_t* recivedData) {
-    bool flag = true;
-    while(flag){
-        *recivedData = uart_read();
-        if (recivedData > 0){
-            flag = false;
-        }
-    }
-}
-
-#include <stdbool.h>
-
-bool validate(const uint8_t* frame, size_t length) {
-    if (length < 4 || frame[0] != START_FLAG || frame[length - 1] != END_FLAG) {
-        // Invalid frame length or missing start/end flag
-        return false;
-    }
-
-    uint16_t received_fcs = (frame[length - 3] << 8) | frame[length - 2];
-    uint16_t calculated_fcs = 0xFFFF;
-
-    for (size_t i = 1; i < length - 3; i++) {
-        uint8_t byte = frame[i];
-        calculated_fcs = (calculated_fcs >> 8) ^ (calculated_fcs << 8) ^ byte;
-        calculated_fcs &= 0xFFFF;
-    }
-
-    return received_fcs == calculated_fcs;
-}
-
-int sendSerialData(const char* port, uint8_t* data, size_t length) {
-    int serial_port = open(port, O_RDWR);
-
-    if (serial_port < 0) {
-        perror("Error opening the serial port");
-        return -1;
-    }
-
-    ssize_t bytes_written = write(serial_port, data, length);
-
-    if (bytes_written < 0) {
-        perror("Error writing to the serial port");
-        return -1;
-    }
-
-    close(serial_port);
-    return bytes_written;
-}
-
-int receiveSerialData(const char* port, uint8_t* data, int length) {
-    int serial_port = open(port, O_RDWR); // Replace "port" with your serial port device
-
-    if (serial_port < 0) {
-        perror("Error opening the serial port");
-        return -1;
-    }
-
-    ssize_t bytes_read = read(serial_port, data, length);
-
-    if (bytes_read < 0) {
-        perror("Error reading from the serial port");
-        return -1;
-    }
-
-    close(serial_port);
-    return bytes_read;
-}

client.h

@@ -1,24 +0,0 @@
-#ifndef CLIENT_H
-#define CLIENT_H
-
-#include "hdlc_frame.h"
-#include "uart_module.h"
-#include <stdbool.h>
-#include <stddef.h> // Для использования size_t
-#include <stdint.h>
-
-typedef struct {
-    bool TEST_IS_VALID;
-    uint8_t address;
-    uint8_t _send_sequence_number;
-    uint8_t poll_final;
-    uint8_t _receive_sequence_number;
-} Client;
-
-void init_Client(Client* client, bool test_is_valid, uint8_t address);
-void connect(Client* client);
-void send(Client* client, uint8_t* data, size_t data_length);
-void receive_data(uint8_t* recivedData);
-bool validate(const uint8_t* frame, size_t length);
-
-#endif

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_frame.c

@@ -1,108 +0,0 @@
-#include "hdlc_frame.h"
-
-#include <string.h>
-
-#define START_FLAG 0x7E
-#define END_FLAG 0x7E
-#define ESCAPE_FLAG 0x7D
-#define ESCAPE_XOR 0x20
-
-void init_HDLCFrame(HDLCFrame* frame, uint8_t address, uint8_t control, uint8_t* data, size_t data_length) {
-    frame->address = address;
-    frame->control = control;
-    frame->data = data;
-    frame->data_length = data_length;
-}
-
-uint16_t calculate_fcs(const HDLCFrame *frame, size_t i) {
-    uint16_t fcs = 0xFFFF;
-
-    uint8_t data_bytes[2 + frame->data_length];
-    data_bytes[0] = frame->address;
-    data_bytes[1] = frame->control;
-    memcpy(data_bytes + 2, frame->data, frame->data_length);
-
-    for (size_t i = 0; i < frame->data_length + 2; i++) {
-        uint8_t byte = data_bytes[i];
-        fcs = (fcs >> 8) ^ (fcs << 8) ^ byte;
-        fcs &= 0xFFFF;
-    }
-
-    return fcs;
-}
-
-void create_frame(const HDLCFrame* frame, uint8_t* result) {
-    size_t index = 0;
-
-    result[index++] = START_FLAG;
-    result[index++] = frame->address;
-    result[index++] = frame->control;
-
-    if (frame->data != NULL) {
-        for (size_t i = 0; i < frame->data_length; i++) {
-            uint8_t byte = frame->data[i];
-            if (byte == START_FLAG || byte == END_FLAG || byte == ESCAPE_FLAG) {
-                result[index++] = ESCAPE_FLAG;
-                result[index++] = byte ^ ESCAPE_XOR;
-            } else {
-                result[index++] = byte;
-            }
-        }
-    }
-
-    uint16_t fcs = calculate_fcs(frame, 0);
-    result[index++] = fcs & 0xFF;
-    result[index++] = (fcs >> 8) & 0xFF;
-    result[index++] = END_FLAG;
-}
-
-void init_IFrame(IFrame* frame, uint8_t address, uint8_t receive_sequence_number, uint8_t poll_final,
-                 uint8_t send_sequence_number, uint8_t* data, size_t data_length) {
-    init_HDLCFrame(&frame->base, address,
-                   ((receive_sequence_number & 0b111) << 6) | ((poll_final & 0b1) << 4) |
-                   ((send_sequence_number & 0b111) << 1) | 0,
-                   data, data_length);
-    frame->receive_sequence_number = receive_sequence_number;
-    frame->poll_final = poll_final;
-    frame->send_sequence_number = send_sequence_number;
-}
-
-void init_SFrame(SFrame* frame, uint8_t address, uint8_t receive_sequence_number, uint8_t poll_final,
-                 const char* frame_type) {
-    uint8_t frame_type_value;
-    if (strcmp(frame_type, "RR") == 0) {
-        frame_type_value = 0;
-    } else if (strcmp(frame_type, "RNR") == 0) {
-        frame_type_value = 1;
-    } else if (strcmp(frame_type, "REJ") == 0) {
-        frame_type_value = 2;
-    } else if (strcmp(frame_type, "SREJ") == 0) {
-        frame_type_value = 3;
-    } else {
-        // Handle error
-        return;
-    }
-
-    init_HDLCFrame(&frame->base, address,
-                   ((receive_sequence_number & 0b111) << 6) | ((poll_final & 0b1) << 5) |
-                   ((frame_type_value & 0b111) << 2) | 1,
-                   NULL, 0);
-    frame->receive_sequence_number = receive_sequence_number;
-    frame->poll_final = poll_final;
-    frame->frame_type = frame_type;
-}
-
-void init_UFrame(UFrame* frame, uint8_t address, uint8_t poll_final, const char* frame_type,
-                 uint8_t* data, size_t data_length) {
-    uint8_t frame_type_value;
-    if (strcmp(frame_type, "BP") == 0) {
-        frame_type_value = 63;
-    } else {
-        // Handle error
-        return;
-    }
-
-    init_HDLCFrame(&frame->base, address, (frame_type_value << 2) | 3, data, data_length);
-    frame->poll_final = poll_final;
-    frame->frame_type = frame_type;
-}

hdlc_frame.h

@@ -1,45 +0,0 @@
-#ifndef HDLC_FRAME_H
-#define HDLC_FRAME_H
-
-#include <stdint.h>
-
-typedef struct {
-    uint8_t address;
-    uint8_t control;
-    uint8_t* data;
-    size_t data_length;
-} HDLCFrame;
-
-void init_HDLCFrame(HDLCFrame* frame, uint8_t address, uint8_t control, uint8_t* data, size_t data_length);
-uint16_t calculate_fcs(const HDLCFrame *frame, size_t i);
-void create_frame(const HDLCFrame* frame, uint8_t* result);
-
-typedef struct {
-    HDLCFrame base;
-    uint8_t receive_sequence_number;
-    uint8_t poll_final;
-    uint8_t send_sequence_number;
-} IFrame;
-
-void init_IFrame(IFrame* frame, uint8_t address, uint8_t receive_sequence_number, uint8_t poll_final,
-                 uint8_t send_sequence_number, uint8_t* data, size_t data_length);
-
-typedef struct {
-    HDLCFrame base;
-    uint8_t receive_sequence_number;
-    uint8_t poll_final;
-    const char* frame_type;
-} SFrame;
-
-void init_SFrame(SFrame* frame, uint8_t address, uint8_t receive_sequence_number, uint8_t poll_final,
-                 const char* frame_type);
-
-typedef struct {
-    HDLCFrame base;
-    uint8_t poll_final;
-    const char* frame_type;
-} UFrame;
-
-void init_UFrame(UFrame* frame, uint8_t address, uint8_t poll_final, const char* frame_type, uint8_t* data, size_t data_length);
-
-#endif

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

main.c

@@ -1,25 +0,0 @@
-#include <stdint.h>
-#include "config.h"
-#include <avr/io.h>
-#include <util/delay.h>
-#include <avr/interrupt.h>
-#include "uart_hal.h"
-
-
-int main(void)
-{
-	//example
-	uint8_t data = 'A';
-
-	uart_init(9600,0);
-    uart_send_byte(data);
-	sei();
-    while (1) 
-    {
-		if(uart_read_count() > 0){
-			data = uart_read();
-			uart_send_byte(data);
-		}
-
-    }
-}

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;
+}

uart_module.c

@@ -1,82 +0,0 @@
-#include "uart_hal.h"
-
-volatile static uint8_t rx_buffer[RX_BUFFER_SIZE] = {0};
-volatile static uint16_t rx_count = 0;
-volatile static uint8_t uart_tx_busy = 1;
-// кольцевой буффер
-ISR(USART_RX_vect){
-	
-	volatile static uint16_t rx_write_pos = 0;
-	
-	rx_buffer[rx_write_pos] = UDR0;
-	rx_count++;
-	rx_write_pos++;
-	if(rx_write_pos >= RX_BUFFER_SIZE){
-		rx_write_pos = 0;
-	}
-	
-}
-
-
-ISR(USART_TX_vect){
-	uart_tx_busy = 1;
-}
-
-
-void uart_init(uint32_t baud,uint8_t high_speed){
-	
-	uint8_t speed = 16;
-	
-	if(high_speed != 0){
-		speed = 8;
-		UCSR0A |= 1 << U2X0;
-	}
-	
-	baud = (F_CPU/(speed*baud)) - 1;
-	
-	UBRR0H = (baud & 0x0F00) >> 8;
-	UBRR0L = (baud & 0x00FF);
-	
-	UCSR0B |= (1 << TXEN0) | (1 << RXEN0) | (1 << TXCIE0) | (1 << RXCIE0);
-	
-}
-
-
-void uart_send_byte(uint8_t c){
-	while(uart_tx_busy == 0);
-	uart_tx_busy = 0;
-	UDR0 = c;
-}
-
-void uart_send_array(uint8_t *c,uint16_t len){
-	for(uint16_t i = 0; i < len;i++){
-		uart_send_byte(c[i]);
-	}
-}
-
-void uart_send_string(uint8_t *c){
-	uint16_t i = 0;
-	do{
-		uart_send_byte(c[i]);
-		i++;
-		
-	}while(c[i] != '\0');
-	uart_send_byte(c[i]);
-}
-
-uint16_t uart_read_count(void){
-	return rx_count;
-}
-
-uint8_t uart_read(void){
-	static uint16_t rx_read_pos = 0;
-	uint8_t data = 0;
-	
-	data = rx_buffer[rx_read_pos];
-	rx_read_pos++;
-	rx_count--;
-	if(rx_read_pos >= RX_BUFFER_SIZE){
-		rx_read_pos = 0;
-	}
-	return data;
-}

uart_module.h

@@ -1,20 +0,0 @@
-#ifndef UART_HAL_H_
-#define UART_HAL_H_
-
-
-#include <stdint.h>
-#include "config.h"
-#include <avr/io.h>
-#include <util/delay.h>
-#include <avr/interrupt.h>
-
-#define RX_BUFFER_SIZE 128
-
-void uart_init(uint32_t baud,uint8_t high_speed);
-void uart_send_byte(uint8_t c);
-void uart_send_array(uint8_t *c,uint16_t len);
-void uart_send_string(uint8_t *c);
-uint16_t uart_read_count(void);
-uint8_t uart_read(void);
-
-#endif /* UART_HAL_H_ */