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bacnet-stack/ports/win32/dlmstp-mm.c
Patrick Grimm 01349ec9e8 fork from http://sourceforge.net/projects/bacnet/
2013-03-21 22:53:31 +01:00

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/**************************************************************************
*
* Copyright (C) 2006 Steve Karg <skarg@users.sourceforge.net>
* Multimedia Timer contribution by Cameron Crothers, 2008
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "bacdef.h"
#include "bacaddr.h"
#include "mstp.h"
#include "dlmstp.h"
#include "rs485.h"
#include "npdu.h"
#include "bits.h"
#define WIN32_LEAN_AND_MEAN
#define STRICT 1
#include <windows.h>
#include <MMSystem.h> /* for multimedia timers */
/* Number of MS/TP Packets Rx/Tx */
uint16_t MSTP_Packets = 0;
/* packet queues */
static DLMSTP_PACKET Receive_Packet;
static HANDLE Receive_Packet_Flag;
/* mechanism to wait for a frame in state machine */
HANDLE Received_Frame_Flag;
static DLMSTP_PACKET Transmit_Packet;
/* local MS/TP port data - shared with RS-485 */
volatile struct mstp_port_struct_t MSTP_Port;
/* buffers needed by mstp port struct */
static uint8_t TxBuffer[MAX_MPDU];
static uint8_t RxBuffer[MAX_MPDU];
/* Timer that indicates line silence - and functions */
static uint32_t SilenceStartTime;
static uint32_t TimeBeginPeriod;
/* 1-millisecond target resolution */
#define TARGET_RESOLUTION 1
static uint16_t Timer_Silence(
void)
{
uint32_t now = timeGetTime();
uint32_t delta_time = 0;
if (SilenceStartTime < now) {
delta_time = now - SilenceStartTime;
} else {
delta_time = (UINT32_MAX - SilenceStartTime) + now + 1;
}
if (delta_time > 0xFFFF) {
delta_time = 0xFFFF;
}
return (uint16_t) delta_time;
}
static void Timer_Silence_Reset(
void)
{
SilenceStartTime = timeGetTime();
}
void dlmstp_reinit(
void)
{
/*RS485_Reinit(); */
dlmstp_set_mac_address(DEFAULT_MAC_ADDRESS);
dlmstp_set_max_info_frames(DEFAULT_MAX_INFO_FRAMES);
dlmstp_set_max_master(DEFAULT_MAX_MASTER);
/* reset timer resolution */
timeEndPeriod(TimeBeginPeriod);
}
void dlmstp_cleanup(
void)
{
/* nothing to do for static buffers */
if (Received_Frame_Flag) {
CloseHandle(Received_Frame_Flag);
}
if (Receive_Packet_Flag) {
CloseHandle(Receive_Packet_Flag);
}
}
/* returns number of bytes sent on success, zero on failure */
int dlmstp_send_pdu(
BACNET_ADDRESS * dest, /* destination address */
BACNET_NPDU_DATA * npdu_data, /* network information */
uint8_t * pdu, /* any data to be sent - may be null */
unsigned pdu_len)
{ /* number of bytes of data */
int bytes_sent = 0;
unsigned i = 0;
if (!Transmit_Packet.ready) {
if (npdu_data->data_expecting_reply) {
Transmit_Packet.frame_type =
FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY;
} else {
Transmit_Packet.frame_type =
FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
}
Transmit_Packet.pdu_len = pdu_len;
for (i = 0; i < pdu_len; i++) {
Transmit_Packet.pdu[i] = pdu[i];
}
bacnet_address_copy(&Transmit_Packet.address, dest);
bytes_sent = pdu_len + MAX_HEADER;
Transmit_Packet.ready = true;
}
return bytes_sent;
}
uint16_t dlmstp_receive(
BACNET_ADDRESS * src, /* source address */
uint8_t * pdu, /* PDU data */
uint16_t max_pdu, /* amount of space available in the PDU */
unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0;
DWORD wait_status = 0;
(void) max_pdu;
/* see if there is a packet available, and a place
to put the reply (if necessary) and process it */
wait_status = WaitForSingleObject(Receive_Packet_Flag, timeout);
if (wait_status == WAIT_OBJECT_0) {
if (Receive_Packet.ready) {
if (Receive_Packet.pdu_len) {
MSTP_Packets++;
if (src) {
memmove(src, &Receive_Packet.address,
sizeof(Receive_Packet.address));
}
if (pdu) {
memmove(pdu, &Receive_Packet.pdu,
sizeof(Receive_Packet.pdu));
}
pdu_len = Receive_Packet.pdu_len;
}
Receive_Packet.ready = false;
}
}
return pdu_len;
}
static void dlmstp_receive_fsm_task(
void *pArg)
{
bool received_frame;
(void) pArg;
(void) SetThreadPriority(GetCurrentThread(),
THREAD_PRIORITY_TIME_CRITICAL);
while (TRUE) {
/* only do receive state machine while we don't have a frame */
if ((MSTP_Port.ReceivedValidFrame == false) &&
(MSTP_Port.ReceivedInvalidFrame == false)) {
do {
RS485_Check_UART_Data(&MSTP_Port);
MSTP_Receive_Frame_FSM(&MSTP_Port);
received_frame = MSTP_Port.ReceivedValidFrame ||
MSTP_Port.ReceivedInvalidFrame;
if (received_frame) {
ReleaseSemaphore(Received_Frame_Flag, 1, NULL);
break;
}
} while (MSTP_Port.DataAvailable);
}
}
}
static void dlmstp_master_fsm_task(
void *pArg)
{
DWORD dwMilliseconds = 0;
(void) pArg;
(void) SetThreadPriority(GetCurrentThread(),
THREAD_PRIORITY_TIME_CRITICAL);
while (TRUE) {
switch (MSTP_Port.master_state) {
case MSTP_MASTER_STATE_IDLE:
dwMilliseconds = Tno_token;
break;
case MSTP_MASTER_STATE_WAIT_FOR_REPLY:
dwMilliseconds = Treply_timeout;
break;
case MSTP_MASTER_STATE_POLL_FOR_MASTER:
dwMilliseconds = Tusage_timeout;
break;
default:
dwMilliseconds = 0;
break;
}
if (dwMilliseconds)
WaitForSingleObject(Received_Frame_Flag, dwMilliseconds);
MSTP_Master_Node_FSM(&MSTP_Port);
}
}
void dlmstp_fill_bacnet_address(
BACNET_ADDRESS * src,
uint8_t mstp_address)
{
int i = 0;
if (mstp_address == MSTP_BROADCAST_ADDRESS) {
/* mac_len = 0 if broadcast address */
src->mac_len = 0;
src->mac[0] = 0;
} else {
src->mac_len = 1;
src->mac[0] = mstp_address;
}
/* fill with 0's starting with index 1; index 0 filled above */
for (i = 1; i < MAX_MAC_LEN; i++) {
src->mac[i] = 0;
}
src->net = 0;
src->len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
src->adr[i] = 0;
}
}
/* for the MS/TP state machine to use for putting received data */
uint16_t MSTP_Put_Receive(
volatile struct mstp_port_struct_t *mstp_port)
{
uint16_t pdu_len = 0;
BOOL rc;
if (!Receive_Packet.ready) {
/* bounds check - maybe this should send an abort? */
pdu_len = mstp_port->DataLength;
if (pdu_len > sizeof(Receive_Packet.pdu))
pdu_len = sizeof(Receive_Packet.pdu);
memmove((void *) &Receive_Packet.pdu[0],
(void *) &mstp_port->InputBuffer[0], pdu_len);
dlmstp_fill_bacnet_address(&Receive_Packet.address,
mstp_port->SourceAddress);
Receive_Packet.pdu_len = mstp_port->DataLength;
Receive_Packet.ready = true;
rc = ReleaseSemaphore(Receive_Packet_Flag, 1, NULL);
}
return pdu_len;
}
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
volatile struct mstp_port_struct_t * mstp_port,
unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0;
uint8_t destination = 0; /* destination address */
(void) timeout;
if (!Transmit_Packet.ready) {
return 0;
}
/* load destination MAC address */
if (Transmit_Packet.address.mac_len == 1) {
destination = Transmit_Packet.address.mac[0];
} else {
return 0;
}
if ((MAX_HEADER + Transmit_Packet.pdu_len) > MAX_MPDU) {
return 0;
}
/* convert the PDU into the MSTP Frame */
pdu_len = MSTP_Create_Frame(&mstp_port->OutputBuffer[0], /* <-- loading this */
mstp_port->OutputBufferSize, Transmit_Packet.frame_type, destination,
mstp_port->This_Station, &Transmit_Packet.pdu[0],
Transmit_Packet.pdu_len);
Transmit_Packet.ready = false;
return pdu_len;
}
bool dlmstp_compare_data_expecting_reply(
uint8_t * request_pdu,
uint16_t request_pdu_len,
uint8_t src_address,
uint8_t * reply_pdu,
uint16_t reply_pdu_len,
BACNET_ADDRESS * dest_address)
{
uint16_t offset;
/* One way to check the message is to compare NPDU
src, dest, along with the APDU type, invoke id.
Seems a bit overkill */
struct DER_compare_t {
BACNET_NPDU_DATA npdu_data;
BACNET_ADDRESS address;
uint8_t pdu_type;
uint8_t invoke_id;
uint8_t service_choice;
};
struct DER_compare_t request;
struct DER_compare_t reply;
/* unused parameters */
request_pdu_len = request_pdu_len;
reply_pdu_len = reply_pdu_len;
/* decode the request data */
request.address.mac[0] = src_address;
request.address.mac_len = 1;
offset =
npdu_decode(&request_pdu[0], NULL, &request.address,
&request.npdu_data);
if (request.npdu_data.network_layer_message) {
return false;
}
request.pdu_type = request_pdu[offset] & 0xF0;
if (request.pdu_type != PDU_TYPE_CONFIRMED_SERVICE_REQUEST) {
return false;
}
request.invoke_id = request_pdu[offset + 2];
/* segmented message? */
if (request_pdu[offset] & BIT3)
request.service_choice = request_pdu[offset + 5];
else
request.service_choice = request_pdu[offset + 3];
/* decode the reply data */
bacnet_address_copy(&reply.address, dest_address);
offset =
npdu_decode(&reply_pdu[0], &reply.address, NULL, &reply.npdu_data);
if (reply.npdu_data.network_layer_message) {
return false;
}
/* reply could be a lot of things:
confirmed, simple ack, abort, reject, error */
reply.pdu_type = reply_pdu[offset] & 0xF0;
switch (reply.pdu_type) {
case PDU_TYPE_CONFIRMED_SERVICE_REQUEST:
reply.invoke_id = reply_pdu[offset + 2];
/* segmented message? */
if (reply_pdu[offset] & BIT3)
reply.service_choice = reply_pdu[offset + 5];
else
reply.service_choice = reply_pdu[offset + 3];
break;
case PDU_TYPE_SIMPLE_ACK:
reply.invoke_id = reply_pdu[offset + 1];
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_COMPLEX_ACK:
reply.invoke_id = reply_pdu[offset + 1];
/* segmented message? */
if (reply_pdu[offset] & BIT3)
reply.service_choice = reply_pdu[offset + 4];
else
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_ERROR:
reply.invoke_id = reply_pdu[offset + 1];
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_REJECT:
case PDU_TYPE_ABORT:
reply.invoke_id = reply_pdu[offset + 1];
break;
default:
return false;
}
/* these don't have service choice included */
if ((reply.pdu_type == PDU_TYPE_REJECT) ||
(reply.pdu_type == PDU_TYPE_ABORT)) {
if (request.invoke_id != reply.invoke_id) {
return false;
}
} else {
if (request.invoke_id != reply.invoke_id) {
return false;
}
if (request.service_choice != reply.service_choice) {
return false;
}
}
if (request.npdu_data.protocol_version != reply.npdu_data.protocol_version) {
return false;
}
if (request.npdu_data.priority != reply.npdu_data.priority) {
return false;
}
if (!bacnet_address_same(&request.address, &reply.address)) {
return false;
}
return true;
}
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(
volatile struct mstp_port_struct_t * mstp_port,
unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0; /* return value */
uint8_t destination = 0; /* destination address */
bool matched = false;
(void) timeout;
if (!Transmit_Packet.ready) {
return 0;
}
/* load destination MAC address */
if (Transmit_Packet.address.mac_len == 1) {
destination = Transmit_Packet.address.mac[0];
} else {
return 0;
}
if ((MAX_HEADER + Transmit_Packet.pdu_len) > MAX_MPDU) {
return 0;
}
/* is this the reply to the DER? */
matched =
dlmstp_compare_data_expecting_reply(&mstp_port->InputBuffer[0],
mstp_port->DataLength, mstp_port->SourceAddress,
&Transmit_Packet.pdu[0], Transmit_Packet.pdu_len,
&Transmit_Packet.address);
if (!matched)
return 0;
/* convert the PDU into the MSTP Frame */
pdu_len = MSTP_Create_Frame(&mstp_port->OutputBuffer[0], /* <-- loading this */
mstp_port->OutputBufferSize, Transmit_Packet.frame_type, destination,
mstp_port->This_Station, &Transmit_Packet.pdu[0],
Transmit_Packet.pdu_len);
Transmit_Packet.ready = false;
return pdu_len;
}
void dlmstp_set_mac_address(
uint8_t mac_address)
{
/* Master Nodes can only have address 0-127 */
if (mac_address <= 127) {
MSTP_Port.This_Station = mac_address;
/* FIXME: implement your data storage */
/* I2C_Write_Byte(
EEPROM_DEVICE_ADDRESS,
mac_address,
EEPROM_MSTP_MAC_ADDR); */
if (mac_address > MSTP_Port.Nmax_master)
dlmstp_set_max_master(mac_address);
}
return;
}
uint8_t dlmstp_mac_address(
void)
{
return MSTP_Port.This_Station;
}
/* This parameter represents the value of the Max_Info_Frames property of */
/* the node's Device object. The value of Max_Info_Frames specifies the */
/* maximum number of information frames the node may send before it must */
/* pass the token. Max_Info_Frames may have different values on different */
/* nodes. This may be used to allocate more or less of the available link */
/* bandwidth to particular nodes. If Max_Info_Frames is not writable in a */
/* node, its value shall be 1. */
void dlmstp_set_max_info_frames(
uint8_t max_info_frames)
{
if (max_info_frames >= 1) {
MSTP_Port.Nmax_info_frames = max_info_frames;
/* FIXME: implement your data storage */
/* I2C_Write_Byte(
EEPROM_DEVICE_ADDRESS,
(uint8_t)max_info_frames,
EEPROM_MSTP_MAX_INFO_FRAMES_ADDR); */
}
return;
}
uint8_t dlmstp_max_info_frames(
void)
{
return MSTP_Port.Nmax_info_frames;
}
/* This parameter represents the value of the Max_Master property of the */
/* node's Device object. The value of Max_Master specifies the highest */
/* allowable address for master nodes. The value of Max_Master shall be */
/* less than or equal to 127. If Max_Master is not writable in a node, */
/* its value shall be 127. */
void dlmstp_set_max_master(
uint8_t max_master)
{
if (max_master <= 127) {
if (MSTP_Port.This_Station <= max_master) {
MSTP_Port.Nmax_master = max_master;
/* FIXME: implement your data storage */
/* I2C_Write_Byte(
EEPROM_DEVICE_ADDRESS,
max_master,
EEPROM_MSTP_MAX_MASTER_ADDR); */
}
}
return;
}
uint8_t dlmstp_max_master(
void)
{
return MSTP_Port.Nmax_master;
}
/* RS485 Baud Rate 9600, 19200, 38400, 57600, 115200 */
void dlmstp_set_baud_rate(
uint32_t baud)
{
RS485_Set_Baud_Rate(baud);
}
uint32_t dlmstp_baud_rate(
void)
{
return RS485_Get_Baud_Rate();
}
void dlmstp_get_my_address(
BACNET_ADDRESS * my_address)
{
int i = 0; /* counter */
my_address->mac_len = 1;
my_address->mac[0] = MSTP_Port.This_Station;
my_address->net = 0; /* local only, no routing */
my_address->len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
my_address->adr[i] = 0;
}
return;
}
void dlmstp_get_broadcast_address(
BACNET_ADDRESS * dest)
{ /* destination address */
int i = 0; /* counter */
if (dest) {
dest->mac_len = 1;
dest->mac[0] = MSTP_BROADCAST_ADDRESS;
dest->net = BACNET_BROADCAST_NETWORK;
dest->len = 0; /* always zero when DNET is broadcast */
for (i = 0; i < MAX_MAC_LEN; i++) {
dest->adr[i] = 0;
}
}
return;
}
bool dlmstp_init(
char *ifname)
{
unsigned long hThread = 0;
uint32_t arg_value = 0;
TIMECAPS tc;
/* initialize packet queue */
Receive_Packet.ready = false;
Receive_Packet.pdu_len = 0;
Receive_Packet_Flag = CreateSemaphore(NULL, 0, 1, "dlmstpReceivePacket");
if (Receive_Packet_Flag == NULL)
exit(1);
Received_Frame_Flag = CreateSemaphore(NULL, 0, 1, "dlsmtpReceiveFrame");
if (Received_Frame_Flag == NULL) {
CloseHandle(Receive_Packet_Flag);
exit(1);
}
/* initialize hardware */
/* initialize hardware */
if (ifname) {
RS485_Set_Interface(ifname);
#if PRINT_ENABLED
fprintf(stderr, "MS/TP Interface: %s\n", ifname);
#endif
}
RS485_Initialize();
MSTP_Port.InputBuffer = &RxBuffer[0];
MSTP_Port.InputBufferSize = sizeof(RxBuffer);
MSTP_Port.OutputBuffer = &TxBuffer[0];
MSTP_Port.OutputBufferSize = sizeof(TxBuffer);
MSTP_Port.SilenceTimer = Timer_Silence;
MSTP_Port.SilenceTimerReset = Timer_Silence_Reset;
MSTP_Init(&MSTP_Port);
#if 0
uint8_t data;
/* FIXME: implement your data storage */
data = 64; /* I2C_Read_Byte(
EEPROM_DEVICE_ADDRESS,
EEPROM_MSTP_MAC_ADDR); */
if (data <= 127)
MSTP_Port.This_Station = data;
else
dlmstp_set_my_address(DEFAULT_MAC_ADDRESS);
/* FIXME: implement your data storage */
data = 127; /* I2C_Read_Byte(
EEPROM_DEVICE_ADDRESS,
EEPROM_MSTP_MAX_MASTER_ADDR); */
if ((data <= 127) && (data >= MSTP_Port.This_Station))
MSTP_Port.Nmax_master = data;
else
dlmstp_set_max_master(DEFAULT_MAX_MASTER);
/* FIXME: implement your data storage */
data = 1;
/* I2C_Read_Byte(
EEPROM_DEVICE_ADDRESS,
EEPROM_MSTP_MAX_INFO_FRAMES_ADDR); */
if (data >= 1)
MSTP_Port.Nmax_info_frames = data;
else
dlmstp_set_max_info_frames(DEFAULT_MAX_INFO_FRAMES);
#endif
#if PRINT_ENABLED
fprintf(stderr, "MS/TP MAC: %02X\n", MSTP_Port.This_Station);
fprintf(stderr, "MS/TP Max_Master: %02X\n", MSTP_Port.Nmax_master);
fprintf(stderr, "MS/TP Max_Info_Frames: %u\n", MSTP_Port.Nmax_info_frames);
#endif
/* set timer resolution */
if (timeGetDevCaps(&tc, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
fprintf(stderr, "Failed to set timer resolution\n");
}
TimeBeginPeriod =
min(max(tc.wPeriodMin, TARGET_RESOLUTION), tc.wPeriodMax);
timeBeginPeriod(TimeBeginPeriod);
/* start the threads */
hThread = _beginthread(dlmstp_receive_fsm_task, 4096, &arg_value);
if (hThread == 0) {
fprintf(stderr, "Failed to start recive FSM task\n");
}
hThread = _beginthread(dlmstp_master_fsm_task, 4096, &arg_value);
if (hThread == 0) {
fprintf(stderr, "Failed to start Master Node FSM task\n");
}
return true;
}
#ifdef TEST_DLMSTP
#include <stdio.h>
void apdu_handler(
BACNET_ADDRESS * src, /* source address */
uint8_t * apdu, /* APDU data */
uint16_t pdu_len)
{ /* for confirmed messages */
(void) src;
(void) apdu;
(void) pdu_len;
}
/* returns a delta timestamp */
uint32_t timestamp_ms(
void)
{
DWORD ticks = 0, delta_ticks = 0;
static DWORD last_ticks = 0;
ticks = GetTickCount();
delta_ticks =
(ticks >= last_ticks ? ticks - last_ticks : MAXDWORD - last_ticks);
last_ticks = ticks;
return delta_ticks;
}
static char *Network_Interface = "COM3";
int main(
int argc,
char *argv[])
{
uint16_t pdu_len = 0;
/* argv has the "COM4" or some other device */
if (argc > 1) {
Network_Interface = argv[1];
}
dlmstp_set_baud_rate(38400);
dlmstp_set_mac_address(0x05);
dlmstp_set_max_info_frames(DEFAULT_MAX_INFO_FRAMES);
dlmstp_set_max_master(DEFAULT_MAX_MASTER);
dlmstp_init(Network_Interface);
/* forever task */
for (;;) {
pdu_len = dlmstp_receive(NULL, NULL, 0, INFINITE);
#if 0
MSTP_Create_And_Send_Frame(&MSTP_Port, FRAME_TYPE_TEST_REQUEST,
MSTP_Port.SourceAddress, MSTP_Port.This_Station, NULL, 0);
#endif
}
return 0;
}
#endif
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