free ModBus on STM32F767

[Pilous Droip]

Hello friends.

I try imeplement freemodbus on my project. And I have a problem with connect. My task is here:

/* ------------------------ Defines --------------------------------------- */
 
#define REG_INPUT_START         1000
#define REG_INPUT_NREGS         4
#define REG_HOLDING_START       2000
#define REG_HOLDING_NREGS       130
 
/* ----------------------- Static variables ---------------------------------*/
static USHORT   usRegInputStart = REG_INPUT_START;
static USHORT   usRegInputBuf[REG_INPUT_NREGS];
static USHORT   usRegHoldingStart = REG_HOLDING_START;
static USHORT   usRegHoldingBuf[REG_HOLDING_NREGS];
 
void ModbusTask(void *pvParameters)
{
	eMBErrorCode    xStatus;
 
	InfoPrint("FINISH INIT modbus");
 
	while (1)
	{
		if (eMBTCPInit( MB_TCP_PORT_USE_DEFAULT) != MB_ENOERR)
		{
			InfoPrint("can't initialize modbus stack!");
		}
		else if (eMBEnable() != MB_ENOERR)
		{
			InfoPrint("can't enable modbus stack!");
		}
		else
		{
			do
			{
				xStatus = eMBPoll();
			} while (xStatus == MB_ENOERR);
		}
		/* An error occured. Maybe we can restart. */
		(void) eMBDisable();
		(void) eMBClose();
	}
}
 
void init_modbus(void)
{
	xTaskCreate(ModbusTask, "ModbusTask", 4096, (void *) NULL, 2, NULL);
}
 
eMBErrorCode
eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
{
    eMBErrorCode    eStatus = MB_ENOERR;
    int             iRegIndex;
 
    if( ( usAddress >= REG_INPUT_START )
        && ( usAddress + usNRegs <= REG_INPUT_START + REG_INPUT_NREGS ) )
    {
        iRegIndex = ( int )( usAddress - usRegInputStart );
        while( usNRegs > 0 )
        {
            *pucRegBuffer++ = ( unsigned char )( usRegInputBuf[iRegIndex] >> 8 );
            *pucRegBuffer++ = ( unsigned char )( usRegInputBuf[iRegIndex] & 0xFF );
            iRegIndex++;
            usNRegs--;
        }
    }
    else
    {
        eStatus = MB_ENOREG;
    }
    return eStatus;
}
 
eMBErrorCode
eMBRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs, eMBRegisterMode eMode )
{
    eMBErrorCode    eStatus = MB_ENOERR;
    int             iRegIndex;
 
    if( ( usAddress >= REG_HOLDING_START ) &&
        ( usAddress + usNRegs <= REG_HOLDING_START + REG_HOLDING_NREGS ) )
    {
        iRegIndex = ( int )( usAddress - usRegHoldingStart );
        switch ( eMode )
        {
            /* Pass current register values to the protocol stack. */
        case MB_REG_READ:
            while( usNRegs > 0 )
            {
                *pucRegBuffer++ = ( UCHAR ) ( usRegHoldingBuf[iRegIndex] >> 8 );
                *pucRegBuffer++ = ( UCHAR ) ( usRegHoldingBuf[iRegIndex] & 0xFF );
                iRegIndex++;
                usNRegs--;
            }
            break;
 
            /* Update current register values with new values from the
             * protocol stack. */
        case MB_REG_WRITE:
            while( usNRegs > 0 )
            {
                usRegHoldingBuf[iRegIndex] = *pucRegBuffer++ << 8;
                usRegHoldingBuf[iRegIndex] |= *pucRegBuffer++;
                iRegIndex++;
                usNRegs--;
            }
        }
    }
    else
    {
        eStatus = MB_ENOREG;
    }
    return eStatus;
}
 
eMBErrorCode
eMBRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils, eMBRegisterMode eMode )
{
    return MB_ENOREG;
}
 
eMBErrorCode
eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
{
    return MB_ENOREG;
}

And configuration with port is in added files. Can anybody help me with it?

[parth kothiya]

i am also facing same problem i'm using stm32f103 and stm32f4 discovery board to communicate with HMI

[Pilous Droip]

I modificated my task function:

void ModbusTask(void *pvParameters)
{
	if (eMBTCPInit( MB_TCP_PORT_USE_DEFAULT) != MB_ENOERR)
	{
		InfoPrint("FreeMODBUS: fail init");
	}
 
	if (eMBEnable() != MB_ENOERR)
	{
		InfoPrint("FreeMODBUS: fail enable");
	}
 
	InfoPrint("FINISH INIT modbus");
 
	while (1)
	{
		eMBPoll();
	}
 
}

and enable debug output. So I use to connect Hercules SETUP utility by HW-group.com. I set IP address: 192.168.11.111 port: 502 in client mode. And I know, connection is good.

But how to connect client with modbus I don't know....

[Pilous Droip]

Hello.

I try implement this project: https://github.com/armink/FreeModbus_Slave-Master-RTT-STM32/releases/tag/V1.1

And now client is working. And now I am trying start master. And I have a problem with init master. Does anybody help?

Here is my source codes...

Source in: porttcp.c work with client.

Init function

#if MB_MASTER_TCP_ENABLED > 0
eMBErrorCode eMBMasterTCPInit(USHORT ucTCPPort)
{
	eMBErrorCode eStatus = MB_ENOERR;
 
	if ((eStatus = eMBTCPDoInit(ucTCPPort)) != MB_ENOERR)
	{
		eMBState = STATE_DISABLED;
	}
	else if (!xMBPortEventInit())
	{
		/* Port dependent event module initalization failed. */
		eStatus = MB_EPORTERR;
	}
	else
	{
		pvMBMasterFrameStartCur = eMBTCPStart;
		pvMBMasterFrameStopCur = eMBTCPStop;
		peMBMasterFrameReceiveCur = eMBTCPReceive;
		peMBMasterFrameSendCur = eMBTCPSend;
		pvMBMasterFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBTCPPortClose : NULL;
		eMBState = STATE_DISABLED;
	}
	return eStatus;
}
#endif

And I think, I will must create a new source file: porttcp_m.c with functions for master. Is it?