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/*
* Copyright (c) 2020 PHYTEC Messtechnik GmbH
* Copyright (c) 2021 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* Parts of this file are based on mb.h from uC/Modbus Stack.
*
* uC/Modbus
* The Embedded Modbus Stack
*
* Copyright 2003-2020 Silicon Laboratories Inc. www.silabs.com
*
* SPDX-License-Identifier: APACHE-2.0
*
* This software is subject to an open source license and is distributed by
* Silicon Laboratories Inc. pursuant to the terms of the Apache License,
* Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
*/
#ifndef ZEPHYR_INCLUDE_MODBUS_INTERNAL_H_
#define ZEPHYR_INCLUDE_MODBUS_INTERNAL_H_
#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/modbus/modbus.h>
#ifdef CONFIG_MODBUS_FP_EXTENSIONS
#define MODBUS_FP_EXTENSIONS_ADDR 5000
#else
#define MODBUS_FP_EXTENSIONS_ADDR UINT16_MAX
#endif
#define MODBUS_RTU_MTU 256
/* Modbus function codes */
#define MODBUS_FC01_COIL_RD 1
#define MODBUS_FC02_DI_RD 2
#define MODBUS_FC03_HOLDING_REG_RD 3
#define MODBUS_FC04_IN_REG_RD 4
#define MODBUS_FC05_COIL_WR 5
#define MODBUS_FC06_HOLDING_REG_WR 6
#define MODBUS_FC08_DIAGNOSTICS 8
#define MODBUS_FC15_COILS_WR 15
#define MODBUS_FC16_HOLDING_REGS_WR 16
/* Diagnostic sub-function codes */
#define MODBUS_FC08_SUBF_QUERY 0
#define MODBUS_FC08_SUBF_CLR_CTR 10
#define MODBUS_FC08_SUBF_BUS_MSG_CTR 11
#define MODBUS_FC08_SUBF_BUS_CRC_CTR 12
#define MODBUS_FC08_SUBF_BUS_EXCEPT_CTR 13
#define MODBUS_FC08_SUBF_SERVER_MSG_CTR 14
#define MODBUS_FC08_SUBF_SERVER_NO_RESP_CTR 15
/* Modbus RTU (ASCII) constants */
#define MODBUS_COIL_OFF_CODE 0x0000
#define MODBUS_COIL_ON_CODE 0xFF00
#define MODBUS_RTU_MIN_MSG_SIZE 4
#define MODBUS_CRC16_POLY 0xA001
#define MODBUS_ASCII_MIN_MSG_SIZE 11
#define MODBUS_ASCII_START_FRAME_CHAR ':'
#define MODBUS_ASCII_END_FRAME_CHAR1 '\r'
#define MODBUS_ASCII_END_FRAME_CHAR2 '\n'
/* Modbus ADU constants */
#define MODBUS_ADU_PROTO_ID 0x0000
struct modbus_serial_config {
/* UART device */
const struct device *dev;
/* RTU timeout (maximum inter-frame delay) */
uint32_t rtu_timeout;
/* Pointer to current position in buffer */
uint8_t *uart_buf_ptr;
/* Pointer to driver enable (DE) pin config */
struct gpio_dt_spec *de;
/* Pointer to receiver enable (nRE) pin config */
struct gpio_dt_spec *re;
/* RTU timer to detect frame end point */
struct k_timer rtu_timer;
/* Number of bytes received or to send */
uint16_t uart_buf_ctr;
/* Storage of received characters or characters to send */
uint8_t uart_buf[CONFIG_MODBUS_BUFFER_SIZE];
};
#define MODBUS_STATE_CONFIGURED 0
struct modbus_context {
/* Interface name */
const char *iface_name;
union {
/* Serial line configuration */
struct modbus_serial_config *cfg;
/* RAW TX callback */
struct modbus_raw_cb rawcb;
};
/* MODBUS mode */
enum modbus_mode mode;
/* True if interface is configured as client */
bool client;
/* Amount of time client is willing to wait for response from server */
uint32_t rxwait_to;
/* Pointer to user server callbacks */
struct modbus_user_callbacks *mbs_user_cb;
/* Interface state */
atomic_t state;
/* Client's mutually exclusive access */
struct k_mutex iface_lock;
/* Wait for response semaphore */
struct k_sem client_wait_sem;
/* Server work item */
struct k_work server_work;
/* Received frame */
struct modbus_adu rx_adu;
/* Frame to transmit */
struct modbus_adu tx_adu;
/* Records error from frame reception, e.g. CRC error */
int rx_adu_err;
#ifdef CONFIG_MODBUS_FC08_DIAGNOSTIC
uint16_t mbs_msg_ctr;
uint16_t mbs_crc_err_ctr;
uint16_t mbs_except_ctr;
uint16_t mbs_server_msg_ctr;
uint16_t mbs_noresp_ctr;
#endif
/* A linked list of function code, handler pairs */
sys_slist_t user_defined_cbs;
/* Unit ID */
uint8_t unit_id;
};
/**
* @brief Get Modbus interface context.
*
* @param ctx Modbus interface context
*
* @retval Pointer to interface context or NULL
* if interface not available or not configured;
*/
struct modbus_context *modbus_get_context(const uint8_t iface);
/**
* @brief Get Modbus interface index.
*
* @param ctx Pointer to Modbus interface context
*
* @retval Interface index or negative error value.
*/
int modbus_iface_get_by_ctx(const struct modbus_context *ctx);
/**
* @brief Send ADU.
*
* @param ctx Modbus interface context
*/
void modbus_tx_adu(struct modbus_context *ctx);
/**
* @brief Send ADU and wait certain time for response.
*
* @param ctx Modbus interface context
*
* @retval 0 If the function was successful,
* -ENOTSUP if Modbus mode is not supported,
* -ETIMEDOUT on timeout,
* -EMSGSIZE on length error,
* -EIO on CRC error.
*/
int modbus_tx_wait_rx_adu(struct modbus_context *ctx);
/**
* @brief Let server handle the received ADU.
*
* @param ctx Modbus interface context
*
* @retval True if the server has prepared a response ADU
* that should be sent.
*/
bool modbus_server_handler(struct modbus_context *ctx);
/**
* @brief Reset server stats.
*
* @param ctx Modbus interface context
*/
void modbus_reset_stats(struct modbus_context *ctx);
/**
* @brief Disable serial line reception.
*
* @param ctx Modbus interface context
*/
void modbus_serial_rx_disable(struct modbus_context *ctx);
/**
* @brief Enable serial line reception.
*
* @param ctx Modbus interface context
*/
void modbus_serial_rx_enable(struct modbus_context *ctx);
/**
* @brief Assemble ADU from serial line RX buffer
*
* @param ctx Modbus interface context
*
* @retval 0 If the function was successful,
* -ENOTSUP if serial line mode is not supported,
* -EMSGSIZE on length error,
* -EIO on CRC error.
*/
int modbus_serial_rx_adu(struct modbus_context *ctx);
/**
* @brief Assemble ADU from serial line RX buffer
*
* @param ctx Modbus interface context
*
* @retval 0 If the function was successful,
* -ENOTSUP if serial line mode is not supported.
*/
int modbus_serial_tx_adu(struct modbus_context *ctx);
/**
* @brief Initialize serial line support.
*
* @param ctx Modbus interface context
* @param param Configuration parameter of the interface
*
* @retval 0 If the function was successful.
*/
int modbus_serial_init(struct modbus_context *ctx,
struct modbus_iface_param param);
/**
* @brief Disable serial line support.
*
* @param ctx Modbus interface context
*/
void modbus_serial_disable(struct modbus_context *ctx);
int modbus_raw_rx_adu(struct modbus_context *ctx);
int modbus_raw_tx_adu(struct modbus_context *ctx);
int modbus_raw_init(struct modbus_context *ctx,
struct modbus_iface_param param);
#endif /* ZEPHYR_INCLUDE_MODBUS_INTERNAL_H_ */