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lib freemodbus porting for esp32

License: MIT License

C 99.39% Makefile 0.61%

modbus-rtu modbus-master freemodbus esp32 porting-to-esp32

modbus_port_esp32's Introduction

modbus_port_esp32

lib freemodbus porting for esp32

you must know thise lib should be used for modbus master role.

implemented:(see components/esp-modbus/functions/)

一、简述

FreeModbus是一款开源的Modbus协议栈，但是只有从机开源，主机源码是需要收费的。同时网上也没有发现比较好的开源的Modbus主机协议栈，所以才开发这款支持主机模式的FreeModbus协议栈。本版FreeModbus版本号更改为V1.6,支持Modbus主机协议栈，特性如下：

CMD - 0x01

eMBMasterReqReadCoils

CMD - 0x02

eMBMasterReqReadDiscreteInputs

CMD - 0x03

eMBMasterReqReadHoldingRegister

CMD - 0x04

eMBMasterReqReadInputRegister

CMD - 0x05

eMBMasterReqWriteCoil

CMD - 0x06

eMBMasterReqWriteHoldingRegister

CMD - 0x0f

eMBMasterReqWriteMultipleCoils

CMD - 0x10

eMBMasterReqWriteMultipleHoldingRegister

CMD - 0x17

eMBMasterReqReadWriteMultipleHoldingRegister

--now add rs485 support (note:this demo rs485 en pin using gpio12)--

thanks armink ! more reference seeing his git>https://github.com/armink/FreeModbus_Slave-Master-RTT-STM32

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unclerus onepas eds2code mcuiot sam-wang gzhufrank ivancho523 liming2013 cnc4less dbloong clientttt yicheng55 hilam8899 jeff-cn

modbus_port_esp32's Issues

请问，只能当主设备用吗？

Only MasterMode？

rs485 收发切换缓慢

uart_set_pin(MB_UART, MB_UART_TX_PIN, MB_UART_RX_PIN, MB_UART_EN_PIN, UART_PIN_NO_CHANGE);
uart_driver_install(MB_UART, MB_UART_BUF_SIZE * 2, MB_UART_BUF_SIZE * 2, 20, &mb_uart_queue, 0);
uart_set_mode(MB_UART, UART_MODE_RS485_HALF_DUPLEX);
建议使用rs485自身的收发切换
原项目的手动收发切换延迟太高, 如果modbus的发送和返回间隔在10ms左右, 切换太慢就导致收不到返回消息

port event error

mb.h中eMBMasterPoll使用的event queue 和 portevent.c中eMBMasterWaitRequestFinish使用的event queue 要分开使用2个, 否则两处recieve_event产生竞争, 出现未知逻辑错误

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