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clear specific events before modbus master operation. #53

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clear specific events before modbus master operation. #53

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NickXia007
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Next modbus ops may failed if we received some data before operation starting.

Signed-off-by: Xia Haiqiang [email protected]

clear specific events before modbus master operation.
437c9ac 
Next modbus ops may failed if we received some data before operation starting.

Signed-off-by: Xia Haiqiang <[email protected]>
@NickXia007
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The FreeRTOS port version as flowing:
`/**

  • This function is used for clear all events at last modbus operation.
  • @note If you are use OS, you can use OS's event mechanism. Otherwise you have to run
  • much user custom delay for waiting.
    /
    void eMBMasterEventClear( void )
    {
    xEventGroupClearBits(xModbusMasterOsEvent, /     The event group being tested. */
    EV_MASTER_PROCESS_SUCESS | EV_MASTER_ERROR_RESPOND_TIMEOUT
    | EV_MASTER_ERROR_RECEIVE_DATA | EV_MASTER_ERROR_EXECUTE_FUNCTION);
    }
    `

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