File content as of revision 0:bc6e22bac566:

#include "mbed.h"

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
 
/* ----------------------- Defines ------------------------------------------*/
#define REG_INPUT_START 1000
#define REG_INPUT_NREGS 4
#define SLAVE_ID 0x0A

//------------------------------------
// Hyperterminal configuration
// 9600 bauds, 8-bit data, no parity
//------------------------------------

Serial pc_port(SERIAL_TX, SERIAL_RX);

DigitalOut myled(LED1);
/*
int main()
{
    int i = 1;
    pc_port.printf("Hello World !\n");
    while(1) {
        wait(1);
        pc_port.printf("This program runs since %d seconds.\n", i++);
        myled = !myled;
    }
}
*/
 
/* ----------------------- Static variables ---------------------------------*/
static USHORT   usRegInputStart = REG_INPUT_START;
static USHORT   usRegInputBuf[REG_INPUT_NREGS];
 
/* ----------------------- Start implementation -----------------------------*/
int
main( void )
{
    eMBErrorCode    eStatus;
 
    eStatus = eMBInit( MB_RTU, SLAVE_ID, 0, 9600, MB_PAR_NONE );
 
    /* Enable the Modbus Protocol Stack. */
    eStatus = eMBEnable(  );
    
    // Initialise some registers
    usRegInputBuf[1] = 0x1234;
    usRegInputBuf[2] = 0x5678;
    usRegInputBuf[3] = 0x9abc;        
 
    for( ;; )
    {
        ( void )eMBPoll(  );
                
        /* Here we simply count the number of poll cycles. */
        usRegInputBuf[0]++;
    }
}
 
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 (eMode == MB_REG_READ)
    {
        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--;
            }
        }
    }
 
    if (eMode == MB_REG_WRITE)
    {
        if( ( usAddress >= REG_INPUT_START )
            && ( usAddress + usNRegs <= REG_INPUT_START + REG_INPUT_NREGS ) )
        {
            iRegIndex = ( int )( usAddress - usRegInputStart );
            while( usNRegs > 0 )
            {
                usRegInputBuf[iRegIndex] =  ((unsigned int) *pucRegBuffer << 8) | ((unsigned int) *(pucRegBuffer+1));
                pucRegBuffer+=2;
                iRegIndex++;
                usNRegs--;
            }
        }
    }
 
    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;
}