Steve Karg
1f591db6e7
* Added a MS/TP zero-config (automatically choose an unused MAC address) using an algorithm that starts with MAC=64 and waits for a random number of PFM (minimum of 8 plus modulo 64) before attempting to choose a MAC sequentially from 64..127. The confirmation uses a 128-bit UUID with the MSTP Test Request frame. The modifications are in src/bacnet/datalink/mstp.c and src/bacnet/datalink/dlmstp.c modules enabling any device to use zero-config if enabled. A working demonstration is in the ports/stm32f4xx for the NUCLEO board. Complete unit testing is included. Options include lurking forever (wait for a router or another master node before joining) or lurking for a minimum time (enables self forming automatic MAC addressing device nodes).
141 lines
5.0 KiB
C
141 lines
5.0 KiB
C
/************************************************************************
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*
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* Copyright (C) 2011 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*************************************************************************/
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "stm32f4xx.h"
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#include "stm32f4xx_pwr.h"
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#include "stm32f4xx_rcc.h"
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#include "stm32f4xx_rng.h"
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#include "system_stm32f4xx.h"
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#include "bacnet/basic/object/device.h"
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#include "bacnet/basic/sys/mstimer.h"
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#include "bacnet/basic/sys/ringbuf.h"
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#include "bacnet/datalink/datalink.h"
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#include "bacnet/datalink/dlmstp.h"
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#include "bacnet/datalink/mstp.h"
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#include "rs485.h"
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#include "led.h"
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#include "bacnet.h"
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/* MS/TP port */
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static struct mstp_port_struct_t MSTP_Port;
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static struct dlmstp_rs485_driver RS485_Driver = {
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.init = rs485_init,
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.send = rs485_bytes_send,
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.read = rs485_byte_available,
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.transmitting = rs485_rts_enabled,
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.baud_rate = rs485_baud_rate,
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.baud_rate_set = rs485_baud_rate_set,
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.silence_milliseconds = rs485_silence_milliseconds,
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.silence_reset = rs485_silence_reset
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};
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static struct dlmstp_user_data_t MSTP_User_Data;
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static uint8_t Input_Buffer[DLMSTP_MPDU_MAX];
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static uint8_t Output_Buffer[DLMSTP_MPDU_MAX];
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/**
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* @brief Called from _write() function from printf and friends
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* @param[in] ch Character to send
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*/
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int __io_putchar(int ch)
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{
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(void)ch;
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return 0;
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}
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/**
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* @brief Main function
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* @return 0 - never returns
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*/
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int main(void)
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{
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struct mstimer Blink_Timer;
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/*At this stage the microcontroller clock setting is already configured,
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this is done through SystemInit() function which is called from startup
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file (startup_stm32f4xx.s) before to branch to application main.
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To reconfigure the default setting of SystemInit() function, refer to
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system_stm32f4xx.c file */
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SystemCoreClockUpdate();
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/* enable some clocks - USART and GPIO clocks are enabled in our drivers */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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/* initialize hardware layer */
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mstimer_init();
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led_init();
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rs485_init();
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mstimer_set(&Blink_Timer, 500);
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/* initialize MSTP datalink layer */
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MSTP_Port.Nmax_info_frames = DLMSTP_MAX_INFO_FRAMES;
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MSTP_Port.Nmax_master = DLMSTP_MAX_MASTER;
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MSTP_Port.InputBuffer = Input_Buffer;
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MSTP_Port.InputBufferSize = sizeof(Input_Buffer);
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MSTP_Port.OutputBuffer = Output_Buffer;
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MSTP_Port.OutputBufferSize = sizeof(Output_Buffer);
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/* user data */
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MSTP_Port.ZeroConfigEnabled = true;
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MSTP_Port.SlaveNodeEnabled = false;
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MSTP_User_Data.RS485_Driver = &RS485_Driver;
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MSTP_Port.UserData = &MSTP_User_Data;
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dlmstp_init((char *)&MSTP_Port);
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if (MSTP_Port.ZeroConfigEnabled) {
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dlmstp_set_mac_address(255);
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} else {
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/* FIXME: get the address from hardware DIP or from EEPROM */
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dlmstp_set_mac_address(1);
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}
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/* FIXME: get the baud rate from hardware DIP or from EEPROM */
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dlmstp_set_baud_rate(DLMSTP_BAUD_RATE_DEFAULT);
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/* initialize application layer*/
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bacnet_init();
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/* FIXME: get the device ID from EEPROM */
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Device_Set_Object_Instance_Number(103);
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/* seed stdlib rand() with device-id to get pweudo consisten
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zero-config poll slot, or use hardware RNG to get a more random slot */
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#ifdef BACNET_ZERO_CONFIG_RNG_HARDWARE
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/* enable the random number generator hardware */
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RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
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RNG_Cmd(ENABLE);
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while (RNG_GetFlagStatus(RNG_FLAG_DRDY) == RESET) {
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/* wait for 32-bit random number to generate */
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}
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srand(RNG_GetRandomNumber());
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#else
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srand(Device_Object_Instance_Number());
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#endif
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for (;;) {
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if (mstimer_expired(&Blink_Timer)) {
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mstimer_reset(&Blink_Timer);
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led_toggle(LED_LD3);
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led_toggle(LED_RS485);
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}
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led_task();
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bacnet_task();
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}
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}
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