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esp-modbus/modbus/mb_objects/functions/mbfuncholding_master.c
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aleks 1af46133fa fix: master handling of broadcast request
2026-07-08 15:59:17 +02:00

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/*
* SPDX-FileCopyrightText: 2013 Armink
*
* SPDX-License-Identifier: BSD-3-Clause
*
* SPDX-FileContributor: 2020-2026 Espressif Systems (Shanghai) CO LTD
*/
/*
* FreeModbus Library: 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.
*
* File: $Id: mbfuncholding_m.c, v 1.60 2013/09/02 14:13:40 Armink Add Master Functions Exp $
*/
#include "mb_common.h"
#include "mb_proto.h"
#include "transport_common.h"
#include "mb_master.h"
/* ----------------------- Defines ------------------------------------------*/
#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_REGCNT_MAX (0x007D)
#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_REQ_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_WRITE_VALUE_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_WRITE_SIZE (4)
#define MB_PDU_FUNC_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_WRITE_VALUE_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_FUNC_WRITE_SIZE (4)
#define MB_PDU_REQ_WRITE_MUL_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_WRITE_MUL_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF (MB_PDU_DATA_OFF + 4)
#define MB_PDU_REQ_WRITE_MUL_VALUES_OFF (MB_PDU_DATA_OFF + 5)
#define MB_PDU_REQ_WRITE_MUL_SIZE_MIN (5)
#define MB_PDU_REQ_WRITE_MUL_REGCNT_MAX (0x0078)
#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_FUNC_WRITE_MUL_SIZE (4)
#define MB_PDU_REQ_READWRITE_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_READWRITE_READ_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 4)
#define MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF (MB_PDU_DATA_OFF + 6)
#define MB_PDU_REQ_READWRITE_WRITE_BYTECNT_OFF (MB_PDU_DATA_OFF + 8)
#define MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF (MB_PDU_DATA_OFF + 9)
#define MB_PDU_REQ_READWRITE_SIZE_MIN (9)
#define MB_PDU_FUNC_READWRITE_READ_BYTECNT_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_READWRITE_READ_VALUES_OFF (MB_PDU_DATA_OFF + 1)
#define MB_PDU_FUNC_READWRITE_SIZE_MIN (1)
/* ----------------------- Static functions ---------------------------------*/
mb_exception_t mb_error_to_exception(mb_err_enum_t error_code);
/* ----------------------- Start implementation -----------------------------*/
#if MB_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED
#if MB_FUNC_WRITE_HOLDING_ENABLED
/**
* This function will request write holding register.
*
* @param snd_addr slave address
* @param reg_addr register start address
* @param reg_data register data to be written
* @param timeout timeout (-1 will waiting forever)
*
* @return error code
*/
mb_err_enum_t mbm_rq_write_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t reg_addr, uint16_t reg_data, uint32_t tout)
{
uint8_t *mb_frame_ptr;
if (snd_addr > MB_ADDRESS_MAX) {
return MB_EINVAL;
}
if (!mb_port_event_res_take(inst->port_obj, tout)) {
return MB_EBUSY;
}
inst->get_send_buf(inst, &mb_frame_ptr);
inst->set_dest_addr(inst, snd_addr);
mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_WRITE_REGISTER;
mb_frame_ptr[MB_PDU_REQ_WRITE_ADDR_OFF] = reg_addr >> 8;
mb_frame_ptr[MB_PDU_REQ_WRITE_ADDR_OFF + 1] = reg_addr;
mb_frame_ptr[MB_PDU_REQ_WRITE_VALUE_OFF] = reg_data >> 8;
mb_frame_ptr[MB_PDU_REQ_WRITE_VALUE_OFF + 1] = reg_data;
inst->set_send_len(inst, MB_PDU_SIZE_MIN + MB_PDU_REQ_WRITE_SIZE);
(void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
return mb_port_event_wait_req_finish(inst->port_obj);
}
mb_exception_t mbm_fn_write_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
mb_exception_t status = MB_EX_NONE;
mb_err_enum_t reg_status = MB_EILLFUNC;
if (!len_buf || !frame_ptr || !inst) {
return MB_EINVAL;
}
/* For broadcast request do not check the buffer size. */
if (*len_buf == (MB_PDU_SIZE_MIN + MB_PDU_FUNC_WRITE_SIZE)
|| inst->transp_obj->frm_is_bcast(inst->transp_obj)) {
ESP_LOGD(__func__, "Length: %u", *len_buf);
uint16_t reg_address;
reg_address = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8);
reg_address |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF + 1]);
reg_address++;
/* Make callback to update the value. */
if (inst->rw_cbs.reg_holding_cb) {
reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF], reg_address, 1, MB_REG_WRITE);
}
/* If an error occurred convert it into a Modbus exception. */
if (reg_status != MB_ENOERR) {
status = mb_error_to_exception(reg_status);
}
} else {
/* Can't be a valid request because the length is incorrect. */
status = MB_EX_ILLEGAL_DATA_VALUE;
}
return status;
}
#endif
#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED
/**
* This function will request write multiple holding register.
*
* @param snd_addr slave address
* @param reg_addr register start address
* @param reg_num register total number
* @param data_ptr data to be written
* @param timeout timeout (-1 will waiting forever)
*
* @return error code
*/
mb_err_enum_t mbm_rq_write_multi_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t reg_addr, uint16_t reg_num, uint16_t *data_ptr, uint32_t tout)
{
uint8_t *mb_frame_ptr;
uint16_t reg_idx = 0;
if (!data_ptr || !inst || (snd_addr > MB_ADDRESS_MAX)) {
return MB_EINVAL;
}
if (!mb_port_event_res_take(inst->port_obj, tout)) {
return MB_EBUSY;
}
inst->get_send_buf(inst, &mb_frame_ptr);
inst->set_dest_addr(inst, snd_addr);
mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_WRITE_MULTIPLE_REGISTERS;
mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF] = reg_addr >> 8;
mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF + 1] = reg_addr;
mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF] = reg_num >> 8;
mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF + 1] = reg_num;
mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF] = reg_num * 2;
mb_frame_ptr += MB_PDU_REQ_WRITE_MUL_VALUES_OFF;
while (reg_num > reg_idx) {
*mb_frame_ptr++ = data_ptr[reg_idx] >> 8;
*mb_frame_ptr++ = data_ptr[reg_idx++];
}
inst->set_send_len(inst, (MB_PDU_SIZE_MIN + MB_PDU_REQ_WRITE_MUL_SIZE_MIN + 2 * reg_num));
(void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
return mb_port_event_wait_req_finish(inst->port_obj);
}
mb_exception_t mbm_fn_write_multi_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
mb_exception_t status = MB_EX_NONE;
uint8_t *mb_frame_ptr;
uint16_t reg_address;
uint16_t reg_count;
uint16_t byte_count;
mb_err_enum_t reg_status = MB_EILLFUNC;
if (!len_buf || !frame_ptr || !inst) {
return MB_EINVAL;
}
if ((*len_buf == MB_PDU_SIZE_MIN + MB_PDU_FUNC_WRITE_MUL_SIZE)
|| inst->transp_obj->frm_is_bcast(inst->transp_obj)) {
ESP_LOGD(__func__, "Length: %u", *len_buf);
inst->get_send_buf(inst, &mb_frame_ptr);
reg_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF] << 8);
reg_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF + 1]);
reg_address++;
reg_count = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF] << 8);
reg_count |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF + 1]);
byte_count = mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF];
if (byte_count == 2 * reg_count) {
/* Make callback to update the register values. */
if (inst->rw_cbs.reg_holding_cb) {
reg_status = inst->rw_cbs.reg_holding_cb(inst, &mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_VALUES_OFF],
reg_address, reg_count, MB_REG_WRITE);
}
/* If an error occurred 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 request because the length is incorrect. */
status = MB_EX_ILLEGAL_DATA_VALUE;
}
return status;
}
#endif
#if MB_FUNC_READ_HOLDING_ENABLED
/**
* This function will request read holding register.
*
* @param snd_addr slave address
* @param reg_addr register start address
* @param reg_num register total number
* @param timeout timeout (-1 will waiting forever)
*
* @return error code
*/
mb_err_enum_t mbm_rq_read_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t reg_addr, uint16_t reg_num, uint32_t tout)
{
uint8_t *mb_frame_ptr;
if (!inst || (snd_addr > MB_ADDRESS_MAX)) {
return MB_EINVAL;
}
/* The broadcast read holding registers request is not supported. */
if (!snd_addr) {
return MB_ENOREG;
}
if (!mb_port_event_res_take(inst->port_obj, tout)) {
return MB_EBUSY;
}
inst->get_send_buf(inst, &mb_frame_ptr);
inst->set_dest_addr(inst, snd_addr);
mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_READ_HOLDING_REGISTER;
mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF] = reg_addr >> 8;
mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF + 1] = reg_addr;
mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF] = reg_num >> 8;
mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF + 1] = reg_num;
inst->set_send_len(inst, (MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE));
(void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
return mb_port_event_wait_req_finish(inst->port_obj);
}
mb_exception_t mbm_fn_read_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
mb_exception_t status = MB_EX_NONE;
uint8_t *mb_frame_ptr;
uint16_t reg_address;
uint16_t reg_count;
mb_err_enum_t reg_status = MB_EILLFUNC;
ESP_LOGD(__func__, "Buffer length: %u, bcast: %u", *len_buf, (unsigned)inst->transp_obj->frm_is_bcast(inst->transp_obj));
ESP_LOG_BUFFER_HEX_LEVEL(__func__, (void *)frame_ptr, *len_buf, ESP_LOG_DEBUG);
if (inst->transp_obj->frm_is_bcast(inst->transp_obj)) {
status = MB_EX_ILLEGAL_DATA_ADDRESS;
} else if ((*len_buf >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN)) {
inst->get_send_buf(inst, &mb_frame_ptr);
reg_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF] << 8);
reg_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF + 1]);
reg_address++;
reg_count = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF] << 8);
reg_count |= (uint16_t)(mb_frame_ptr[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 ((reg_count >= 1) && (2 * reg_count == frame_ptr[MB_PDU_FUNC_READ_BYTECNT_OFF])) {
/* Make callback to update the register values. */
if (inst->rw_cbs.reg_holding_cb) {
reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_READ_VALUES_OFF],
reg_address, reg_count, MB_REG_READ);
}
/* If an error occurred 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 request because the length is incorrect. */
status = MB_EX_ILLEGAL_DATA_VALUE;
}
return status;
}
#endif
#if MB_FUNC_READWRITE_HOLDING_ENABLED
/**
* This function will request read and write holding register.
*
* @param snd_addr slave address
* @param rd_reg_addr read register start address
* @param rd_reg_num read register total number
* @param data_ptr data to be written
* @param wr_reg_addr write register start address
* @param wr_reg_num write register total number
* @param timeout timeout (-1 will waiting forever)
*
* @return error code
*/
mb_err_enum_t mbm_rq_rw_multi_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t rd_reg_addr,
uint16_t rd_reg_num, uint16_t *data_ptr, uint16_t wr_reg_addr, uint16_t wr_reg_num, uint32_t tout)
{
uint8_t *mb_frame_ptr;
uint16_t reg_idx = 0;
if (!data_ptr || !inst || (snd_addr > MB_ADDRESS_MAX)) {
return MB_EINVAL;
}
if (!mb_port_event_res_take(inst->port_obj, tout)) {
return MB_EBUSY;
}
inst->get_send_buf(inst, &mb_frame_ptr);
inst->set_dest_addr(inst, snd_addr);
mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;
mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] = rd_reg_addr >> 8;
mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF + 1] = rd_reg_addr;
mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF] = rd_reg_num >> 8;
mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF + 1] = rd_reg_num;
mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF] = wr_reg_addr >> 8;
mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF + 1] = wr_reg_addr;
mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF] = wr_reg_num >> 8;
mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF + 1] = wr_reg_num;
mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_BYTECNT_OFF] = wr_reg_num * 2;
mb_frame_ptr += MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF;
while (wr_reg_num > reg_idx) {
*mb_frame_ptr++ = data_ptr[reg_idx] >> 8;
*mb_frame_ptr++ = data_ptr[reg_idx++];
}
inst->set_send_len(inst, (MB_PDU_SIZE_MIN + MB_PDU_REQ_READWRITE_SIZE_MIN + 2 * wr_reg_num));
(void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
return mb_port_event_wait_req_finish(inst->port_obj);
}
mb_exception_t mbm_fn_rw_multi_holding_regs(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
mb_exception_t status = MB_EX_NONE;
mb_err_enum_t reg_status = MB_EILLFUNC;
uint16_t reg_rd_cnt, reg_wr_cnt;
uint16_t reg_rd_address, reg_wr_address;
uint8_t *mb_frame_ptr;
if (!len_buf || !frame_ptr || !inst) {
return MB_EINVAL;
}
/* If this request is broadcast, do not check the length */
if ((*len_buf >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READWRITE_SIZE_MIN)
|| inst->transp_obj->frm_is_bcast(inst->transp_obj)) {
ESP_LOGD(__func__, "Length: %u", *len_buf);
inst->get_send_buf(inst, &mb_frame_ptr);
reg_rd_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] << 8);
reg_rd_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF + 1]);
reg_rd_address++;
reg_rd_cnt = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF] << 8);
reg_rd_cnt |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF + 1]);
reg_wr_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF] << 8U);
reg_wr_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF + 1]);
reg_wr_address++;
reg_wr_cnt = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF] << 8U);
reg_wr_cnt |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF + 1]);
if ((2 * reg_rd_cnt) == frame_ptr[MB_PDU_FUNC_READWRITE_READ_BYTECNT_OFF]) {
/* Make callback to update the register values. */
if (inst->rw_cbs.reg_holding_cb) {
reg_status = inst->rw_cbs.reg_holding_cb(inst, &mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF],
reg_wr_address, reg_wr_cnt, MB_REG_WRITE);
}
if (reg_status == MB_ENOERR) {
/* Make the read callback. */
if (inst->rw_cbs.reg_holding_cb) {
reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_READWRITE_READ_VALUES_OFF],
reg_rd_address, reg_rd_cnt, MB_REG_READ);
}
}
if (reg_status != MB_ENOERR) {
status = mb_error_to_exception(reg_status);
}
} else {
status = MB_EX_ILLEGAL_DATA_VALUE;
}
}
return status;
}
#endif
#endif // #if MB_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED
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