generic_functions.cpp

/*
 * uuid-modbus - Microcontroller asynchronous Modbus library
 * Copyright 2021-2022  Simon Arlott
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <uuid/modbus.h>
 
#include <Arduino.h>
 
#include <algorithm>
#include <cstdarg>
#include <cstdint>
#include <memory>
 
namespace uuid {
 
namespace modbus {
 
Request::Request(uint16_t device, uint8_t function_code, uint16_t timeout_ms,
        const std::shared_ptr<Response> &response)
        : device_(device), function_code_(function_code), timeout_ms_(timeout_ms),
        response_(response) {
}
 
uint16_t Request::encode(frame_buffer_t &frame) {
    frame[0] = device();
    frame[1] = function_code();
    return 2;
}
 
bool Response::check_length(frame_buffer_t &frame, uint16_t actual, uint16_t expected) {
    if (actual != expected) {
        logger.err(F("Length mismatch for function %02X from device %u, expected %u received %u"),
            frame[1], frame[0], expected, actual);
        return false;
    } else {
        return true;
    }
}
 
} // namespace modbus
 
} // namespace uuid