| /**************************************************************************** |
| * apps/modbus/functions/mbfuncinput_m.c |
| * |
| * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. |
| * Copyright (C) 2013 Armink <armink.ztl@gmail.com> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "port.h" |
| |
| #include <apps/modbus/mb.h> |
| #include <apps/modbus/mb_m.h> |
| #include <apps/modbus/mbframe.h> |
| #include <apps/modbus/mbproto.h> |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| #define MB_PDU_REQ_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0) |
| #define MB_PDU_REQ_READ_REGCNT_OFF (MB_PDU_DATA_OFF + 2) |
| #define MB_PDU_REQ_READ_SIZE (4) |
| #define MB_PDU_FUNC_READ_BYTECNT_OFF (MB_PDU_DATA_OFF + 0) |
| #define MB_PDU_FUNC_READ_VALUES_OFF (MB_PDU_DATA_OFF + 1) |
| #define MB_PDU_FUNC_READ_SIZE_MIN (1) |
| |
| #define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF (MB_PDU_DATA_OFF) |
| |
| /**************************************************************************** |
| * Public Function Prototypes |
| ****************************************************************************/ |
| |
| eMBException prveMBError2Exception(eMBErrorCode eErrorCode); |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| #if defined(CONFIG_RTU_ASCII_MASTER) || defined(CONFIG_MB_ASCII_MASTER) |
| |
| /**************************************************************************** |
| * Description: |
| * This function will request read input register. |
| * |
| * Input Parameters: |
| * ucSndAddr salve address |
| * usRegAddr register start address |
| * usNRegs register total number |
| * lTimeOut timeout (-1 will waiting forever) |
| * |
| * Returned Value: |
| * error code |
| * |
| ****************************************************************************/ |
| |
| #if defined(CONFIG_MB_FUNC_READ_INPUT_ENABLED) |
| eMBMasterReqErrCode eMBMasterReqReadInputRegister(uint8_t ucSndAddr, |
| uint16_t usRegAddr, |
| uint16_t usNRegs, |
| uint32_t lTimeOut) |
| { |
| uint8_t *ucMBFrame; |
| eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR; |
| |
| if (ucSndAddr > CONFIG_MB_MASTER_TOTAL_SLAVE_NUM) |
| { |
| eErrStatus = MB_MRE_ILL_ARG; |
| } |
| else if (xMBMasterRunResTake(lTimeOut) == false) |
| { |
| eErrStatus = MB_MRE_MASTER_BUSY; |
| } |
| else |
| { |
| vMBMasterGetPDUSndBuf(&ucMBFrame); |
| vMBMasterSetDestAddress(ucSndAddr); |
| ucMBFrame[MB_PDU_FUNC_OFF] = MB_FUNC_READ_INPUT_REGISTER; |
| ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] = usRegAddr >> 8; |
| ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF + 1] = usRegAddr; |
| ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF] = usNRegs >> 8; |
| ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF + 1] = usNRegs; |
| vMBMasterSetPDUSndLength(MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE); |
| (void)xMBMasterPortEventPost(EV_MASTER_FRAME_SENT); |
| eErrStatus = eMBMasterWaitRequestFinish(); |
| } |
| |
| return eErrStatus; |
| } |
| |
| eMBException eMBMasterFuncReadInputRegister(uint8_t *pucFrame, |
| uint16_t *usLen) |
| { |
| uint8_t *ucMBFrame; |
| uint16_t usRegAddress; |
| uint16_t usRegCount; |
| |
| eMBException eStatus = MB_EX_NONE; |
| eMBErrorCode eRegStatus; |
| |
| /* If this request is broadcast, and it's read mode. This request don't need |
| * execute. |
| */ |
| |
| if (xMBMasterRequestIsBroadcast()) |
| { |
| eStatus = MB_EX_NONE; |
| } |
| else if (*usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN) |
| { |
| vMBMasterGetPDUSndBuf(&ucMBFrame); |
| usRegAddress = (uint16_t) (ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8); |
| usRegAddress |= (uint16_t) (ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF + 1]); |
| usRegAddress++; |
| |
| usRegCount = (uint16_t) (ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF] << 8); |
| usRegCount |= (uint16_t) (ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF + 1]); |
| |
| /* Check if the number of registers to read is valid. If not return |
| * Modbus illegal data value exception. |
| */ |
| |
| if ((usRegCount >= 1) && |
| (2 * usRegCount == pucFrame[MB_PDU_FUNC_READ_BYTECNT_OFF])) |
| { |
| /* Make callback to fill the buffer. */ |
| |
| eRegStatus = |
| eMBMasterRegInputCB(&pucFrame[MB_PDU_FUNC_READ_VALUES_OFF], |
| usRegAddress, usRegCount); |
| |
| /* If an error occurred convert it into a Modbus exception. */ |
| |
| if (eRegStatus != MB_ENOERR) |
| { |
| eStatus = prveMBError2Exception(eRegStatus); |
| } |
| } |
| else |
| { |
| eStatus = MB_EX_ILLEGAL_DATA_VALUE; |
| } |
| } |
| else |
| { |
| /* Can't be a valid request because the length is incorrect. */ |
| |
| eStatus = MB_EX_ILLEGAL_DATA_VALUE; |
| } |
| |
| return eStatus; |
| } |
| |
| #endif |
| #endif |