forked from espressif/esp-modbus
225 lines
8.9 KiB
C
225 lines
8.9 KiB
C
/*
|
|
* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
|
|
* Copyright (c) 2016, 2017 Nucleron R&D LLC <main@nucleron.ru>
|
|
* Copyright (c) 2006 Christian Walter <wolti@sil.at>
|
|
* 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.
|
|
*
|
|
* File: $Id: mbfunccoils.c, v 1.8 2007/02/18 23:47:16 wolti Exp $
|
|
*/
|
|
#include <mb_common.h>
|
|
#include <mb_proto.h>
|
|
#include "mb_slave.h"
|
|
/* ----------------------- Defines ------------------------------------------*/
|
|
#define MB_PDU_FUNC_READ_ADDR_OFF (MB_PDU_DATA_OFF)
|
|
#define MB_PDU_FUNC_READ_COILCNT_OFF (MB_PDU_DATA_OFF + 2)
|
|
#define MB_PDU_FUNC_READ_SIZE (4)
|
|
#define MB_PDU_FUNC_READ_COILCNT_MAX (0x07D0)
|
|
|
|
#define MB_PDU_FUNC_WRITE_ADDR_OFF (MB_PDU_DATA_OFF)
|
|
#define MB_PDU_FUNC_WRITE_VALUE_OFF (MB_PDU_DATA_OFF + 2)
|
|
#define MB_PDU_FUNC_WRITE_SIZE (4)
|
|
|
|
#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF (MB_PDU_DATA_OFF)
|
|
#define MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF (MB_PDU_DATA_OFF + 2)
|
|
#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF (MB_PDU_DATA_OFF + 4)
|
|
#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF (MB_PDU_DATA_OFF + 5)
|
|
#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN (5)
|
|
#define MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX (0x07B0)
|
|
|
|
/* ----------------------- Static functions ---------------------------------*/
|
|
mb_exception_t mb_error_to_exception(mb_err_enum_t error_code);
|
|
|
|
/* ----------------------- Start implementation -----------------------------*/
|
|
|
|
#if MB_FUNC_READ_COILS_ENABLED > 0
|
|
|
|
mb_exception_t mbs_fn_read_coils(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
|
|
{
|
|
uint16_t reg_addr;
|
|
uint16_t coil_cnt;
|
|
uint8_t byte_num;
|
|
uint8_t *frame_cur;
|
|
|
|
mb_exception_t status = MB_EX_NONE;
|
|
mb_err_enum_t reg_status = MB_EILLFUNC;
|
|
|
|
if (*len_buf == (MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN)) {
|
|
reg_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_ADDR_OFF] << 8);
|
|
reg_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_ADDR_OFF + 1]);
|
|
reg_addr++;
|
|
|
|
coil_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_COILCNT_OFF] << 8);
|
|
coil_cnt |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_COILCNT_OFF + 1]);
|
|
|
|
/* Check if the number of registers to read is valid. If not
|
|
* return Modbus illegal data value exception.
|
|
*/
|
|
if ((coil_cnt >= 1) &&
|
|
(coil_cnt < MB_PDU_FUNC_READ_COILCNT_MAX)) {
|
|
/* Set the current PDU data pointer to the beginning. */
|
|
frame_cur = &frame_ptr[MB_PDU_FUNC_OFF];
|
|
*len_buf = MB_PDU_FUNC_OFF;
|
|
|
|
/* First byte contains the function code. */
|
|
*frame_cur++ = MB_FUNC_READ_COILS;
|
|
*len_buf += 1;
|
|
|
|
/* Test if the quantity of coils is a multiple of 8. If not last
|
|
* byte is only partially field with unused coils set to zero. */
|
|
if ((coil_cnt & 0x0007) != 0) {
|
|
byte_num = (uint8_t)(coil_cnt / 8 + 1);
|
|
} else {
|
|
byte_num = (uint8_t)(coil_cnt / 8);
|
|
}
|
|
|
|
*frame_cur++ = byte_num;
|
|
*len_buf += 1;
|
|
|
|
if (inst->rw_cbs.reg_coils_cb) {
|
|
reg_status = inst->rw_cbs.reg_coils_cb(inst, frame_cur, reg_addr, coil_cnt, MB_REG_READ);
|
|
}
|
|
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if (reg_status != MB_ENOERR) {
|
|
status = mb_error_to_exception(reg_status);
|
|
} else {
|
|
/* The response contains the function code, the starting address
|
|
* and the quantity of registers. We reuse the old values in the
|
|
* buffer because they are still valid. */
|
|
*len_buf += byte_num;;
|
|
}
|
|
} else {
|
|
status = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
} else {
|
|
/* Can't be a valid read coil register request because the length
|
|
* is incorrect. */
|
|
status = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
#if MB_FUNC_WRITE_COIL_ENABLED > 0
|
|
mb_exception_t mbs_fn_write_coil(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
|
|
{
|
|
uint16_t reg_addr;
|
|
uint8_t buf[2];
|
|
|
|
mb_exception_t status = MB_EX_NONE;
|
|
mb_err_enum_t reg_status = MB_EILLFUNC;
|
|
|
|
if (*len_buf == (MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN)) {
|
|
reg_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8);
|
|
reg_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF + 1]);
|
|
reg_addr++;
|
|
|
|
if ((frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF + 1] == 0x00) &&
|
|
((frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF) ||
|
|
(frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0x00))) {
|
|
buf[1] = 0;
|
|
if (frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF) {
|
|
buf[0] = 1;
|
|
} else {
|
|
buf[0] = 0;
|
|
}
|
|
|
|
if (inst->rw_cbs.reg_coils_cb) {
|
|
reg_status = inst->rw_cbs.reg_coils_cb(inst, &buf[0], reg_addr, 1, MB_REG_WRITE);
|
|
}
|
|
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if (reg_status != MB_ENOERR) {
|
|
status = mb_error_to_exception(reg_status);
|
|
}
|
|
} else {
|
|
status = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
} else {
|
|
/* Can't be a valid write coil register request because the length
|
|
* is incorrect. */
|
|
status = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if MB_FUNC_WRITE_MULTIPLE_COILS_ENABLED > 0
|
|
mb_exception_t mbs_fn_write_multi_coils(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
|
|
{
|
|
uint16_t reg_addr;
|
|
uint16_t coil_cnt;
|
|
uint8_t byte_cnt;
|
|
uint8_t byte_cnt_verify;
|
|
|
|
mb_exception_t status = MB_EX_NONE;
|
|
mb_err_enum_t reg_status = MB_EILLFUNC;
|
|
|
|
if (*len_buf > (MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN)) {
|
|
reg_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8);
|
|
reg_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1]);
|
|
reg_addr++;
|
|
|
|
coil_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF] << 8);
|
|
coil_cnt |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF + 1]);
|
|
|
|
byte_cnt = frame_ptr[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];
|
|
|
|
/* Compute the number of expected bytes in the request. */
|
|
if ((coil_cnt & 0x0007) != 0) {
|
|
byte_cnt_verify = (uint8_t)(coil_cnt / 8 + 1);
|
|
} else {
|
|
byte_cnt_verify = (uint8_t)(coil_cnt / 8);
|
|
}
|
|
|
|
if ((coil_cnt >= 1) &&
|
|
(coil_cnt <= MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX) &&
|
|
(byte_cnt_verify == byte_cnt)) {
|
|
if (inst->rw_cbs.reg_coils_cb) {
|
|
reg_status = inst->rw_cbs.reg_coils_cb(inst, &frame_ptr[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF], reg_addr, coil_cnt, MB_REG_WRITE);
|
|
}
|
|
|
|
/* If an error occured convert it into a Modbus exception. */
|
|
if (reg_status != MB_ENOERR) {
|
|
status = mb_error_to_exception(reg_status);
|
|
} else {
|
|
/* The response contains the function code, the starting address
|
|
* and the quantity of registers. We reuse the old values in the
|
|
* buffer because they are still valid. */
|
|
*len_buf = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;
|
|
}
|
|
} else {
|
|
status = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
} else {
|
|
/* Can't be a valid write coil register request because the length
|
|
* is incorrect. */
|
|
status = MB_EX_ILLEGAL_DATA_VALUE;
|
|
}
|
|
return status;
|
|
}
|
|
#endif
|
|
#endif
|