Can.c

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#ifndef TEST_MODE
#include "stm32f7xx_it.h"
#endif
 
#include "../../../../Inc/Systems/Comms/Can/Can.h"
#include "../../../../Inc/Systems/Comms/Can/DBCParser.h"
#include "../../../../Inc/Systems/PrintHelpers.h"
 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
 
// CAN message list
CAN_MessageList can_messages[MAX_BUS];
 
int init_CANBus(CANBus bus) {
    // Initialize the CAN message list
    can_messages[bus].bus = bus;
    can_messages[bus].num_messages = 0;
 
    return 0;
}
 
int load_dbc_file(CANBus bus, const unsigned char* filename)
{
    // Load the DBC file
    #ifdef TEST_MODE
    // unsigned char* dbc_contents = fopen(filename, "w");
    #else
    unsigned char* dbc_contents = filename;
    #endif
//    printf("Loading DBC file: %c\r\r\n", filename[0]);
    
    #ifndef TEST_MODE
    // Parse the DBC file
    parseDbcFile(&can_messages[bus], dbc_contents);
    #endif
 
    #ifdef TEST_MODE
    // fclose(dbc_contents);
    #endif
 
    print_CAN_MessageList(&can_messages[bus]);
    return 0;
}
 
int add_message(CANBus bus, CAN_Message_Template message) {
    // Add the message to the list
    can_messages[bus].messages[can_messages[bus].num_messages] = message;
    can_messages[bus].num_messages++;
    return 0;
}
 
int add_message_lop(CANBus bus, int id, int dlc, int ide, int rtr, const char* name, const char* sender, int signal_count, CAN_Signal_Template* signals)
{
    // Create a CAN message template
    CAN_Message_Template message;
    message.id = id;
    message.dlc = dlc;
    message.ide = ide;
    message.rtr = rtr;
    strcpy(message.name, name);
    strcpy(message.sender, sender);
    message.signal_count = signal_count;
    message.payload_length = 0;
 
    // Copy the signals
    for (int i = 0; i < signal_count; i++) {
        message.signals[i] = signals[i];
        message.payload_length += signals[i].length;
    }
 
    // Add the message to the list
    return add_message(bus, message);
}
 
// Send a CAN message
int send_CAN_message(CANBus bus, CANProtocol protocol, uint32_t id, uint8_t* data, uint8_t len) {
    CAN_TxHeaderTypeDef TxHeader;
    if (protocol == CAN_2A) {
        TxHeader.StdId = id;
        TxHeader.IDE = CAN_ID_STD;
    } else if (protocol == CAN_2B) {
        TxHeader.ExtId = id;
        TxHeader.IDE = CAN_ID_EXT;
    } else {
        printf("Invalid CAN protocol\r\n");
        return -1;
    }
 
    TxHeader.RTR = CAN_RTR_DATA;
    TxHeader.DLC = len;
 
    // Print the message
    printf(ANSI_COLOR_YELLOW "Sending CAN Message" ANSI_COLOR_RESET ": ID: %d, DLC: %d, Data: ", id, len);
    for (int i = 0; i < len; i++) {
        printf("%02X ", data[i]);
    }
    printf("\r\n");
 
    #ifndef TEST_MODE
    // Send the CAN message
    if (send_CAN_message_helper(bus, &TxHeader, data) != 0) {
        return -2;
    }
    #endif
    return 0;
}
 
// Receive a CAN message from the Callback
void receive_CAN_message(CAN_RxHeaderTypeDef* RxHeader, uint8_t* RxData, CANBus bus) {
    CAN_Message* can_message = malloc(sizeof(CAN_Message) + sizeof(CAN_Signal) * 8);
    can_message->header = *RxHeader;
        memcpy(can_message->data, RxData, 8);
 
        // Parse the message
        parseMessage(&can_messages[bus], can_message);
 
        // Print out the contents of the message
        printf(ANSI_COLOR_YELLOW "Received CAN Message" ANSI_COLOR_RESET ": %s (ID: %d, DLC: %d, Sender: %s)\r\n", can_message->template->name, can_message->header.StdId, can_message->header.DLC, can_message->template->sender);
 
        // Print the signals
        for (int i = 0; i < can_message->template->signal_count; i++) {
            CAN_Signal* signal = &can_message->signals[i];
            printf("\t" ANSI_COLOR_MAGENTA "Signal" ANSI_COLOR_RESET ": %s (Value: %u, Unit: %s)\r\n", signal->template->name, signal->value, signal->template->unit);
        }
        printf("\r\n");
 
        // Free the message
        free(can_message);
}
 
// Parse a CAN message
void parseMessage(CAN_MessageList* messages, CAN_Message* can_message) {
    // Find the message in the list
    // TODO: Implement a hash table or map for faster lookup
    for (int i = 0; i < messages->num_messages; i++) {
        CAN_Message_Template* msg = &messages->messages[i];
        if (msg->id == can_message->header.StdId || msg->id == can_message->header.ExtId) {
            // Parse the signals of the message
            can_message->template = msg;
            parseSignals(msg, can_message);
            return;
        }
    }
}
 
// Parse the signals of a CAN message
void parseSignals(CAN_Message_Template* message, CAN_Message* can_message) {
    // Find the signals in the message
    for (int i = 0; i < message->signal_count; i++) {
        CAN_Signal_Template* signal = &message->signals[i];
        // Parse the signal
        parseSignal(signal, &can_message->signals[i], can_message);
    }
}
 
// Parse a CAN signal
void parseSignal(CAN_Signal_Template* signal, CAN_Signal* can_signal, CAN_Message* can_message) {
    can_signal->template = signal;
 
    // Extract the raw data from the message
    uint64_t raw_data = 0;
    for (int i = signal->start_bit; i < signal->start_bit + signal->length; i++) {
        raw_data |= ((can_message->data[i / 8] >> (i % 8)) & 1) << (i - signal->start_bit);
    }
 
    // Check if the signal is big endian
    if (signal->endian == 1) {
        // Reverse the bits
        uint64_t reversed_data = 0;
        for (int i = 0; i < signal->length; i++) {
            reversed_data |= ((raw_data >> i) & 1) << (signal->length - i - 1);
        }
        raw_data = reversed_data;
    }
 
    // Check if the signal is signed
    if (signal->isSigned) {
        // Sign extend the data
        raw_data = (raw_data << (64 - signal->length)) >> (64 - signal->length);
    }
 
    // Scale and offset the data
    can_signal->value = (raw_data * signal->scale) + signal->offset;
 
}
 
void print_CAN_Messages_Lists() {
    for (int i = 0; i < MAX_BUS; i++) {
        printf("Printing CAN Message List for bus %d with %d messages\r\n", i, can_messages[i].num_messages);
        for (int j = 0; j < can_messages[i].num_messages; j++) {
            const CAN_Message_Template* msg = &can_messages[i].messages[j];
            printf(ANSI_COLOR_GREEN "Message" ANSI_COLOR_RESET ": %s (ID: %d, DLC: %d, Sender: %s, SIGs: %d)\r\n", msg->name, msg->id, msg->dlc, msg->sender, msg->signal_count);
            for (int k = 0; k < msg->signal_count; k++) {
                const CAN_Signal_Template* sig = &msg->signals[k];
                printf("\t" ANSI_COLOR_BLUE "Signal" ANSI_COLOR_RESET ": %s (Start bit: %d, Length: %d, Endain: %d, Signed: %c,\r\n\t\tScale: %f, Offset: %f, Min: %f, Max: %f, \r\n\t\tUnit: %s, Reciever: %s)\r\n", sig->name, sig->start_bit, sig->length, sig->endian, sig->isSigned, sig->scale, sig->offset, sig->min, sig->max, sig->unit, sig->reciever);
            }
            printf("\r\n");
        }
        if (can_messages[i].num_messages == 0) {
            printf("No messages on bus %d\r\n", i);
        }
    }
}