https://github.com/liyanboy74/modbus

MODBUS RTU library for STM32 STM8 AVR LPC & more
https://github.com/liyanboy74/modbus

c library modbus rtu stm32

Last synced: about 6 hours ago
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MODBUS RTU library for STM32 STM8 AVR LPC & more

• Host: GitHub
• URL: https://github.com/liyanboy74/modbus
• Owner: liyanboy74
• License: bsd-3-clause
• Created: 2020-10-20T18:03:35.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2024-07-21T04:57:12.000Z (4 months ago)
• Last Synced: 2024-07-21T05:45:20.485Z (4 months ago)
• Topics: c, library, modbus, rtu, stm32
• Language: C
• Homepage:
• Size: 652 KB
• Stars: 35
• Watchers: 2
• Forks: 9
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

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README

        
# MODBUS

Modbus RTU C library for embedded systems.

![MBLib-data-flow](https://user-images.githubusercontent.com/64005694/154830661-b1cc3740-ec50-44c9-9330-b34d01b1224c.svg)

### Requirements

**Memory**

    

        

        Flash

        RAM

    

    

        Master

        ~2K

        64

    

    

        Slave

        ~4K

        96 *

    

* Without database size, default +68 Byte.

### Guide 

Follow below steps:

- Select master or slave mode in `mb.h` or in Compiler Defines.

- Send Byte-by-Byte received data to `mb_rx_new_data()` for processing .

- Use `mb_set_tx_handler()` for set callback for transmit data from MODBUS layer.

- In master mode, received packet don't process automatically! so the callback must be set by `mb_set_master_process_handler()` .

**Note:** The library don't handle Rx Timout error! the `mb_rx_timeout_handler()` must be call for reset rx buffer index .

### Examples

- [STM32 MODBUS Slave Example](https://github.com/ioelectro/modbus-stm32-slave-example.git)

- [STM8 MODBUS Slave Example](https://github.com/ioelectro/modbus-stm8-slave-example)

- [AVR MODBUS Network Example](https://github.com/ioelectro/modbus-avr-example.git)

### File Description

**Common**

- `mb` : Common MODBUS init,functions and types

- `mb-link` : Prepare Packet for send, receive and process

- `mb-crc` : Cyclic redundancy check

- `mb-packet` : Make packets

**Slave**

- `mb-check` : Checking received data

- `mb-process` : Process received packets

- `mb-table` : Database

### Run Test.c

After installing `GCC` and `Make` , run below command:

```

make test

```