Method currentDTCCodes

src/ELMduino.cpp:3064–3222

void ELM327::currentDTCCodes(const bool& isBlocking) Description: ------------ * Get the list of current DTC codes. This method is blocking by default, but can be run in non-blocking mode if desired with optional boolean argument. Typical use involves calling the monitorStatus() function first to get the number of DTC current codes stored, then calling this function to retr

  * void
*/
void ELM327::currentDTCCodes(const bool& isBlocking)
{
    char *idx;
    char codeType = '\0';
    char codeNumber[5] = {0};
    char temp[6] = {0};

    if (isBlocking) // In blocking mode, we loop here until get_response() is past ELM_GETTING_MSG state
    {
        sendCommand("03"); // Check DTC is always Service 03 with no PID
        while (get_response() == ELM_GETTING_MSG)
            ;
    }
    else
    {
        if (nb_query_state == SEND_COMMAND)
        {
            sendCommand("03");
            nb_query_state = WAITING_RESP;
        }

        else if (nb_query_state == WAITING_RESP)
            get_response();
    }

    if (nb_rx_state == ELM_SUCCESS)
    {
        nb_query_state = SEND_COMMAND; // Reset the query state machine for next command
        memset(DTC_Response.codes, 0, DTC_CODE_LEN * DTC_MAX_CODES);

        if (strstr(payload, "43") != NULL) // Successful response to Mode 03 request
        {
            // OBD scanner will provide a response that contains one or more lines indicating the codes present.
            // Each response line will start with "43" indicating it is a response to a Mode 03 request.
            // See p. 31 of ELM327 datasheet for details and lookup table of code types.

            uint8_t codesFound = strlen(payload) / 8; // Each code found returns 8 chars starting with "43"
            idx = strstr(payload, "43") + 4;          // Pointer to first DTC code digit (third char in the response)

            if (codesFound > DTC_MAX_CODES) // I don't think the ELM is capable of returning
            {                               // more than 0xF (16) codes, but just in case...
                codesFound = DTC_MAX_CODES;
                Serial.print(F("DTC response truncated at "));
                Serial.print(DTC_MAX_CODES);
                Serial.println(F(" codes."));
            }

            DTC_Response.codesFound = codesFound;

            for (int i = 0; i < codesFound; i++)
            {
                memset(temp, 0, sizeof(temp));
                memset(codeNumber, 0, sizeof(codeNumber));

                codeType = *idx;            // Get first digit of second byte
                codeNumber[0] = *(idx + 1); // Get second digit of second byte
                codeNumber[1] = *(idx + 2); // Get first digit of third byte
                codeNumber[2] = *(idx + 3); // Get second digit of third byte