new version. Example in main
This commit is contained in:
Qukich
parent
ecdac7b3d3
commit
82408c4d50
200
client.c
200
client.c
@ -1,125 +1,123 @@
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#include "client.h"
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#include "client.h"
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#include "hdlc.h"
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#include "stdio.h"
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#include <stdio.h>
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#define ERR_INVALID_DATA_SIZE -1
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#include <fcntl.h>
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#define ERR_ALL_BUFFERS_FILL -2
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#define ERR_INVALID_PARAMS -3
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#define ERR_INVALID_STATE -4
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#define ERR_FRAME_TIME_OUT -5
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#define ERR_INVALID_SEQ_NUMBER_FRAME -6
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#define ERR_TIMEOUT_ANSWER -7
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#define START_FLAG 0x7E
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#define SIZE_DATA_BUFFERS 64
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#define END_FLAG 0x7E
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void init_Client(Client* client, bool test_is_valid, uint8_t address) {
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int connecting_frame_timeout_bf;
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client->TEST_IS_VALID = test_is_valid;
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client->address = address;
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void init_hdlc_client(struct Client* client, int connecting_frame_timeout){
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client->_send_sequence_number = 0;
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client->state = IDLE_STATE;
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client->poll_final = 1;
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client->connecting_frame_timeout = connecting_frame_timeout;
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client->_receive_sequence_number = 0;
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connecting_frame_timeout_bf = connecting_frame_timeout;
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client->current_state_hdlc.control_escape = 0;
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client->current_state_hdlc.fcs = FCS_INIT_VALUE;
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client->current_state_hdlc.start_index = -1;
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client->current_state_hdlc.end_index = -1;
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client->current_state_hdlc.src_index = 0;
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client->current_state_hdlc.dest_index = 0;
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}
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}
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void connect(struct Client* client, hdlc_control_t* frame){
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client->state = CONNECTING;
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void connect(Client* client) {
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client->frameS.seq_no = 0;
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UFrame u_frame;
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client->frameS.frame = S_FRAME;
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init_UFrame(&u_frame, client->address, client->poll_final, "BP", NULL, 0);
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uint8_t result[256];
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*frame = client->frameS;
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create_frame(&u_frame.base, result);
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// if (client->frame1.seq_no == -4){
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// client->frame1.seq_no = 0;
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// client->frame1.frame = S_FRAME;
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//
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// *frame = client->frame1;
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// } else if (client->frame1.seq_no == -4){
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// client->frame1.seq_no = 0;
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// client->frame1.frame = S_FRAME;
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//
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// *frame = client->frame1;
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// }
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}
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// Wait for acknowledgment frame
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int send_data(struct Client* client, hdlc_control_t* frame, uint8_t* data, size_t data_len){
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bool flag = true;
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if (client->state != READY_STATE){
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uint8_t data;
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return ERR_INVALID_STATE;
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while(flag){
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data = uart_read();
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if (data > 0){
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flag = false;
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}
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}
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}
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HDLCFrame frame;
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client->state = RECIVING;
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init_HDLCFrame(&frame, 0, 0, &data + 3, 256 - 6);
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if (validate(&data, 256)) {
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if (SIZE_DATA_BUFFERS < data_len){
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return;
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return ERR_INVALID_DATA_SIZE;
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}
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client->frameI.seq_no = 0;
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client->frameI.frame = I_FRAME;
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client->data_i_frame = *data;
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client->len_data_i_frame = data_len;
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*frame = client->frameI;
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client->state = RECIVING;
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};
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int hdlc_get_raw_frame(struct Client *client, hdlc_control_t* frame, uint8_t buffer[], size_t lenBuffer) {
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if (frame->frame = S_FRAME){
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int ret = hdlc_frame_data(frame, NULL, 0, buffer, &lenBuffer);
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if (ret < 0){
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printf("err in get_frame: %d\n", ret);
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}
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} else {
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} else {
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// Connection failed
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int ret = hdlc_frame_data(frame, &client->data_i_frame,
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client->len_data_i_frame, buffer, &lenBuffer);
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if (ret < 0){
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printf("err in get_frame: %d\n", ret);
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}
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}
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}
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return 0;
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}
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}
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void send(Client* client, uint8_t* data, size_t data_length) {
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int hdlc_decode_recived_raw_data(struct Client* client, uint8_t buffer[], size_t len_buffer){
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connect(client);
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hdlc_control_t recv_control;
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uint8_t recive[len_buffer];
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IFrame i_frame;
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int ret = hdlc_get_data_with_state(&client->current_state_hdlc, &recv_control, buffer, len_buffer, recive,
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init_IFrame(&i_frame, client->address, client->_receive_sequence_number, client->poll_final, client->_send_sequence_number, data, data_length);
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&len_buffer);
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uint8_t result[256];
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if (ret < 0) {
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create_frame(&i_frame.base, result);
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return ret;
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}
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uart_send_byte(*i_frame.base.data);
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switch (recv_control.frame) {
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case S_FRAME:
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client->state = READY_STATE;
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break;
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case I_FRAME:
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break;
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case S_FRAME_NACK:
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client->state = DISCONNECTING;
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client->frame_rej.seq_no = 0;
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client->frame_rej.frame = S_FRAME_NACK;
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break;
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}
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client->_send_sequence_number++;
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client->connecting_frame_timeout = connecting_frame_timeout_bf;
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return 0;
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}
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}
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void receive_data(uint8_t* recivedData) {
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int hdlc_timeout_handler(struct Client* client, int delta_time){
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bool flag = true;
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client->connecting_frame_timeout -= delta_time;
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while(flag){
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*recivedData = uart_read();
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if (client->connecting_frame_timeout <= 0){
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if (recivedData > 0){
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return ERR_FRAME_TIME_OUT;
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flag = false;
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}
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}
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}
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}
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}
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#include <stdbool.h>
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bool validate(const uint8_t* frame, size_t length) {
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if (length < 4 || frame[0] != START_FLAG || frame[length - 1] != END_FLAG) {
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// Invalid frame length or missing start/end flag
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return false;
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}
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uint16_t received_fcs = (frame[length - 3] << 8) | frame[length - 2];
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uint16_t calculated_fcs = 0xFFFF;
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for (size_t i = 1; i < length - 3; i++) {
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uint8_t byte = frame[i];
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calculated_fcs = (calculated_fcs >> 8) ^ (calculated_fcs << 8) ^ byte;
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calculated_fcs &= 0xFFFF;
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}
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return received_fcs == calculated_fcs;
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}
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int sendSerialData(const char* port, uint8_t* data, size_t length) {
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int serial_port = open(port, O_RDWR);
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if (serial_port < 0) {
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perror("Error opening the serial port");
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return -1;
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}
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ssize_t bytes_written = write(serial_port, data, length);
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if (bytes_written < 0) {
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perror("Error writing to the serial port");
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return -1;
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}
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close(serial_port);
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return bytes_written;
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}
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int receiveSerialData(const char* port, uint8_t* data, int length) {
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int serial_port = open(port, O_RDWR); // Replace "port" with your serial port device
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if (serial_port < 0) {
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perror("Error opening the serial port");
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return -1;
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}
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ssize_t bytes_read = read(serial_port, data, length);
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if (bytes_read < 0) {
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perror("Error reading from the serial port");
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return -1;
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}
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close(serial_port);
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return bytes_read;
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}
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49
client.h
49
client.h
@ -1,24 +1,39 @@
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#ifndef CLIENT_H
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#ifndef CLIENT_H
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#define CLIENT_H
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#define CLIENT_H
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#include "hdlc_frame.h"
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#include "uart_module.h"
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#include <stdbool.h>
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#include <stddef.h> // Для использования size_t
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#include <stdint.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "hdlc.h"
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typedef struct {
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enum HDLCState {
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bool TEST_IS_VALID;
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UNINITIALIZED_STATE = 0, // состояние до инцилизации
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uint8_t address;
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IDLE_STATE, // Состояние ожидания начала
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uint8_t _send_sequence_number;
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READY_STATE, // Состояние принятия
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uint8_t poll_final;
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CONNECTING, // состояние соединения
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uint8_t _receive_sequence_number;
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DISCONNECTING, // состояния отключения
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} Client;
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RECIVING // состояние приема и отправки
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};
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void init_Client(Client* client, bool test_is_valid, uint8_t address);
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struct Client{
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void connect(Client* client);
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enum HDLCState state;
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void send(Client* client, uint8_t* data, size_t data_length);
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int connecting_frame_timeout; //-1
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void receive_data(uint8_t* recivedData);
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hdlc_state_t current_state_hdlc;
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bool validate(const uint8_t* frame, size_t length);
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hdlc_control_t frameS;
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hdlc_control_t frameI;
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uint8_t data_i_frame;
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size_t len_data_i_frame;
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// hdlc_control_t frame3;
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// hdlc_control_t frame4;
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hdlc_control_t frame_rej;
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};
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#endif
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//название функций
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void init_hdlc_client(struct Client* client, int connecting_frame_timeout);
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void connect(struct Client* client, hdlc_control_t* frame);
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int send_data(struct Client* client, hdlc_control_t* frame, uint8_t* data, size_t data_len);
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int hdlc_get_raw_frame(struct Client *client, hdlc_control_t* frame, uint8_t buffer[], size_t lenBuffer);
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//принимает буффер с уарта
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int hdlc_decode_recived_raw_data(struct Client* client, uint8_t buffer[], size_t len_buffer);
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int hdlc_timeout_handler(struct Client* client, int delta_time);
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#endif //CLIENT_H
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41
fcs.c
Normal file
41
fcs.c
Normal file
@ -0,0 +1,41 @@
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#include "fcs.h"
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/*
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* CRC-Type: CRC16 CCIT
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* Polynomial: 0x1021 (x^16+x^12+x^5+1)
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* Lookup Table: Reflected
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*/
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static const unsigned short fcstab[256] = {
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0x0000, 0x1189, 0x2312, 0x329b,
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0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c,
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0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c,
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0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff,
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0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183,
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0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42,
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0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116,
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0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7,
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0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1,
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0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960,
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0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630,
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0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf,
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0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581,
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0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52,
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0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612,
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0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5,
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0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7,
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0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74,
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0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c,
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0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd,
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0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f,
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0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e,
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0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a,
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0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb,
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0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9,
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0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 };
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FCS_SIZE calc_fcs(FCS_SIZE fcs, unsigned char value) {
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return (fcs >> 8) ^ fcstab[(fcs ^ value) & 0xff];
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}
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18
fcs.h
Normal file
18
fcs.h
Normal file
@ -0,0 +1,18 @@
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#ifndef FCS_H
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#define FCS_H
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#define FCS_INIT_VALUE 0xFFFF /* FCS initialization value. */
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#define FCS_GOOD_VALUE 0xF0B8 /* FCS value for valid frames. */
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#define FCS_INVERT_MASK 0xFFFF /* Invert the FCS value accordingly to the specification */
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#define FCS_SIZE unsigned short
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/**
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* Calculates a new FCS based on the current value and value of data.
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*
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* @param fcs Current FCS value
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* @param value The value to be added
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* @returns Calculated FCS value
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*/
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FCS_SIZE calc_fcs(FCS_SIZE fcs, unsigned char value);
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||||||
|
#endif
|
||||||
261
hdlc.c
Normal file
261
hdlc.c
Normal file
@ -0,0 +1,261 @@
|
|||||||
|
#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;
|
||||||
|
}
|
||||||
126
hdlc.h
Normal file
126
hdlc.h
Normal file
@ -0,0 +1,126 @@
|
|||||||
|
//
|
||||||
|
// 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
|
||||||
108
hdlc_frame.c
108
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;
|
|
||||||
}
|
|
||||||
45
hdlc_frame.h
45
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
|
|
||||||
25
main.c
25
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);
|
|
||||||
}
|
|
||||||
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -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;
|
|
||||||
}
|
|
||||||
@ -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_ */
|
|
||||||
Loading…
Reference in New Issue
Block a user