add modbus (not tested yet)

2026-02-28 03:44:30 +03:00 · 2024-09-19 17:32:05 +03:00
parent bdbd7d68d9
commit 22a205001a
22 changed files with 1030 additions and 118 deletions
--- a/F1:F103/FX3U/modbusrtu.h
+++ b/F1:F103/FX3U/modbusrtu.h
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the fx3u project.
+ * Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <stdint.h>
+
+// input and output buffers size
+#define MODBUSBUFSZI  (64)
+#define MODBUSBUFSZO  (64)
+
+#define MODBUS_MASTER_ID    (0)
+#define MODBUS_MAX_ID       (247)
+
+// some exceptions
+typedef enum{
+    ME_ILLEGAL_FUNCION = 1, // The function code received in the request is not an authorized action for the slave.
+    ME_ILLEGAL_ADDRESS = 2, // The data address received by the slave is not an authorized address for the slave.
+    ME_ILLEGAL_VALUE = 3,   // The value in the request data field is not an authorized value for the slave.
+    ME_SLAVE_FAILURE = 4,   // The slave fails to perform a requested action because of an unrecoverable error.
+    ME_ACK = 5,             // The slave accepts the request but needs a long time to process it.
+    ME_SLAVE_BUSY = 6,      // The slave is busy processing another command.
+    ME_NACK = 7,            // The slave cannot perform the programming request sent by the master.
+    ME_PARITY_ERROR = 8,    // Memory parity error: slave is almost dead.
+} modbus_exceptions;
+
+// common function codes; "by bits" means that output data length = (requested+15)/16
+typedef enum{
+    MC_READ_COIL = 1,           // read output[s] state (by bits)
+    MC_READ_DISCRETE = 2,       // read input[s] state (by bits!)
+    MC_READ_HOLDING_REG = 3,
+    MC_READ_INPUT_REG = 4,
+    MC_WRITE_COIL = 5,
+    MC_WRITE_REG = 6,
+    MC_WRITE_MUL_COILS = 0xF,
+    MC_WRITE_MUL_REGS = 0x10,
+} modbus_fcode;
+
+// modbus master request (without CRC)
+typedef struct{
+    uint8_t ID;     // slave ID
+    uint8_t Fcode;  // functional code
+    uint16_t startreg; // started register or single register address
+    uint16_t regno; // number of registers or data to write
+    uint8_t datalen;// data for 0xf/0x10
+    uint8_t *data;
+} modbus_request;
+
+// responce->Fcode & RESPONCE_ERRMARK -> error packet
+#define MODBUS_RESPONSE_ERRMARK    (0x80)
+
+// modbus slave responce (without CRC)
+typedef struct{
+    uint8_t ID;         // slave ID
+    uint8_t Fcode;      // functional code
+    uint8_t datalen;    // length of data in BYTES! (or exception code)
+    uint8_t *data;      // data (or NULL for error packet); BE CAREFUL: all data is big-endian!
+} modbus_response;
+
+void modbus_setup(uint32_t speed);
+int modbus_receive(uint8_t **packet);
+int modbus_get_request(modbus_request* r);
+int modbus_get_response(modbus_response* r);
+int modbus_send(uint8_t *data, int l);
+int modbus_send_request(modbus_request *r);
+int modbus_send_response(modbus_response *r);