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modbus master: add request coils func.

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@590 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
lijin.unix 2010-04-07 06:52:56 +00:00
parent 1e5fe1d7c1
commit 2360e84ec9
2 changed files with 71 additions and 3 deletions
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60
net/freemodbus/modbus/mbmaster.c
View File

@ -66,3 +66,63 @@ eMBErrorCode eMBMReadHoldingRegisters (UCHAR ucSlaveAddress, USHORT usRegStartA
return eStatus;
}
/*! @fn eMBErrorCode eMBMReadCoils (UCHAR ucSlaveAddress, USHORT usCoilStartAddress,
UBYTE ubNCoils, USHORT arusBufferOut[])
** @brief request coils
** @details
** @param ucSlaveAddress slave station address :from 1 to 247(max)
** @param usCoilStartAddress coils address
** @param ubNCoils request coils number
** @param arusBufferOut response packet buf
** @return eMBErrorCode
** @author LiJin
** @date 2010-04-07
** @note
*/
eMBErrorCode eMBMReadCoils (UCHAR ucSlaveAddress, USHORT usCoilStartAddress,
UBYTE ubNCoils, USHORT arusBufferOut[])
{
static UCHAR ucMBFrame[5];
eMBErrorCode eStatus = MB_ENOERR;
eMBEventType eEvent;
static UCHAR ucRcvAddress;
static USHORT usLength;
/* make up request frame */
ucMBFrame[0] = MB_FUNC_READ_COILS;
ucMBFrame[1] = (UCHAR)(usCoilStartAddress >> 8);
ucMBFrame[2] = (UCHAR)(usCoilStartAddress);
ucMBFrame[3] = (UCHAR)(ubNCoils >> 8);
ucMBFrame[4] = (UCHAR)(ubNCoils);
rt_kprintf("send frame [%x%x%x%x%x]\n",
ucMBFrame[0], ucMBFrame[1], ucMBFrame[2], ucMBFrame[3], ucMBFrame[4]);
/* send request frame to slave device */
eStatus = eMBRTUSend( ucSlaveAddress, ucMBFrame, 5 );
/* wait on receive event */
if( xMBPortEventGet( &eEvent ) == TRUE )
{
eStatus = eMBRTUReceive( &ucRcvAddress, &ucMBFrame, &usLength );
if( eStatus == MB_ENOERR )
{
/* Check if the frame is for us. If not ignore the frame. */
if( ( ucRcvAddress == ucSlaveAddress ) || ( ucRcvAddress == MB_ADDRESS_BROADCAST ) )
{
/* parse and restore data */
rt_kprintf("parse and restore date here\n");
}
}
}
else eStatus = MB_ETIMEDOUT;
return eStatus;
}

14
net/freemodbus/modbus/port/demo.c
View File

@ -10,6 +10,7 @@
* Change Logs:
* Date Author Notes
* 2010-04-04 yi.qiu first version
* 2010-04-07 LiJin
*/
/* ----------------------- Platform includes --------------------------------*/
@ -23,10 +24,13 @@
#include "mbproto.h"
#include "mbfunc.h"
USHORT buf[256];
void rt_modbus_thread_entry(void* parameter)
{
eMBErrorCode eStatus;
USHORT buf[100];
eStatus = eMBInit( MB_RTU, 0x0A, 0, 115200, MB_PAR_EVEN );
@ -37,10 +41,14 @@ void rt_modbus_thread_entry(void* parameter)
while(1)
{
eMBMReadHoldingRegisters(0x0A, 0x10000, 0x1, buf);
/* request holding reg */
eMBMReadHoldingRegisters(0x0A, 0x1, 0x10, buf);
rt_kprintf("stop\n");
rt_thread_delay(100);
/* request coils */
eMBMReadCoils(0x0A, 0x1, 128, buf);
rt_thread_delay(100);
//while(1);
}
}