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Mrna 2024-10-11 17:33:05 +02:00
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LICENSE Normal file
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MIT License
Copyright (c) 2024 Veles Labs s.r.o.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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modbus.c
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/* /*
* modbus.c * File: modbus.c
* Description: MODBUS RTU library
* Author: Jan Mrna
* Date: 2021-07-18
*
* Modbus slave RTU library (does NOT support ASCII and TCP)
*
* Note that byte order is big endian.
*
*
* Copyright (c) 2024 Veles Labs s.r.o.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* *
* Created on: Jul 18, 2021
* Author: user
*/ */
#include "modbus.h" #include "modbus.h"

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modbus.h
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/* /*
* modbus.h * File: modbus.h
* Description: MODBUS RTU library
* Author: Jan Mrna
* Date: 2021-07-18
* *
* Created on: Jul 18, 2021 * Modbus slave RTU library (does NOT support ASCII and TCP)
* Author: user
* *
* Modbus slave RTU library (does NOT support ASCII and TCP) * Note that byte order is big endian.
* *
* Useful links:
* https://www.picotech.com/library/oscilloscopes/modbus-serial-protocol-decoding
* https://ipc2u.com/articles/knowledge-base/modbus-rtu-made-simple-with-detailed-descriptions-and-examples/
* https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
* https://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf
* *
* Note that byte order is big endian. * Copyright (c) 2024 Veles Labs s.r.o.
* *
* USAGE: * Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* *
* 1) Implement functions modbus_callback_function() and modbus_uart_transmit_function() * The above copyright notice and this permission notice shall be included in all
* - modbus_uart_transmit_function() sends data via UART * copies or substantial portions of the Software.
* - modbus_callback_function() does the real work: read sensors, set outputs... *
* note that when filling buffers (e.g. input_registers[]) user must * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* ensure that all data is big-endian * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* These functions are implementation-specific. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* 2) Set device address (variable modbus_device_address); you can do this either * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* - setting modbus_device_address directly (modbus.h needs to be included, duh) * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* - using modbus_set_device_address(uint8_t address) function * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* Or you can leave address as-is (MODBUS_DEFAULT_SLAVE_ADDRESS) and set it via * SOFTWARE.
* Modbus during runtime
* 3) Call modbus_process_msg() after message reception; you need to observe Modbus RTU timing:
* - pauses between chars in frame are less or equal to 1.5 char
* - pauses between frames are at least 3.5 chars (of silence)
* For more information see section 2.5.1.1 (MODBUS Message RTU Framing)
* in "MODBUS over Serial Line: Specification and Implementation Guide"
* *
*/ */