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0d53e593696e80f7d7db9d4210106e07ea99650b
bacnet_stack/bacnet-stack/ports/linux/dlmstp_linux.c
T
skarg 7d1550362b Merged revision(s) 3136 from branches/releases/bacnet-stack-0-8-0: 
Replace Receive_Packet_Flag conditional variable with a semaphore and update the related library functions accordingly.
Analysis of the problem determined that the issue lay in the transfer of APDU packets between the FSM and the APDU packet handler thread.
The mechanism previously used by the FSM to notify the APDU packet handler thread that a packet was available for processing used a pthread conditional variable which packet handler thread was supposed to wait on before being signalled by the FSM.
However the packet handler thread has other tasks to perform and sometimes was not waiting on the conditional variable which it was signalled.
Unlike other synchronisation mechanisms such as semaphores, if the waiting task (the consumer) is not blocked on the conditional variable when the producer signals, then that signal is lost and the consumer is never signalled again, leading to a continual sequence of timeouts on the conditional variable.
This in turn led to the packet handler thread never being notified of a packet waiting to be processed thus causing the interface hang.
The main problem is that a conditional variable is supposed to be used with a mutex to prevent this behaviour occurring, but this mutex was not present (and in fact had been removed from the code, most likely because it was causing other synchronisation issues)
Further inspection revealed that this code was copied from another file but modified to remove the mutex which is an essential part of using a conditional variable for synchronisation. This then prevents the producer task being blocked until the consumer task is waiting on the conditional variable, thus leading to a race condition which is causing the issues seen.
The fix is to replace the conditional variable with a semaphore as this provides the required mechanism in this case.
Thank you Ian Smith at Abelon Systems Ltd. for the patch!

........
2017-06-25 18:08:36 +00:00

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/**************************************************************************
*
* Copyright (C) 2008 Steve Karg <skarg@users.sourceforge.net>
*
* 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 <time.h>
#include "bacdef.h"
#include "bacaddr.h"
#include "mstp.h"
/*#include "dlmstp.h" */
#include "dlmstp_linux.h"
#include "rs485.h"
#include "npdu.h"
#include "bits.h"
/* OS Specific include */
#include "net.h"
#include "ringbuf.h"
/** @file linux/dlmstp.c Provides Linux-specific DataLink functions for MS/TP. */
#define BACNET_PDU_CONTROL_BYTE_OFFSET 1
#define BACNET_DATA_EXPECTING_REPLY_BIT 2
#define BACNET_DATA_EXPECTING_REPLY(control) ( (control & (1 << BACNET_DATA_EXPECTING_REPLY_BIT) ) > 0 )
#define INCREMENT_AND_LIMIT_UINT16(x) {if (x < 0xFFFF) x++;}
uint32_t Timer_Silence(
void *poPort)
{
struct timeval now, tmp_diff;
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return -1;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return -1;
}
int32_t res;
gettimeofday(&now, NULL);
timersub(&poSharedData->start, &now, &tmp_diff);
res = ((tmp_diff.tv_sec) * 1000 + (tmp_diff.tv_usec) / 1000);
return (res >= 0 ? res : -res);
}
void Timer_Silence_Reset(
void *poPort)
{
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return;
}
gettimeofday(&poSharedData->start, NULL);
}
void get_abstime(
struct timespec *abstime,
unsigned long milliseconds)
{
struct timeval now, offset, result;
gettimeofday(&now, NULL);
offset.tv_sec = 0;
offset.tv_usec = milliseconds * 1000;
timeradd(&now, &offset, &result);
abstime->tv_sec = result.tv_sec;
abstime->tv_nsec = result.tv_usec * 1000;
}
void dlmstp_cleanup(
void *poPort)
{
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return;
}
/* restore the old port settings */
tcsetattr(poSharedData->RS485_Handle, TCSANOW,
&poSharedData->RS485_oldtio);
close(poSharedData->RS485_Handle);
pthread_cond_destroy(&poSharedData->Received_Frame_Flag);
sem_destroy(&poSharedData->Receive_Packet_Flag);
pthread_cond_destroy(&poSharedData->Master_Done_Flag);
pthread_mutex_destroy(&poSharedData->Received_Frame_Mutex);
pthread_mutex_destroy(&poSharedData->Master_Done_Mutex);
}
/* returns number of bytes sent on success, zero on failure */
int dlmstp_send_pdu(
void *poPort,
BACNET_ADDRESS * dest, /* destination address */
uint8_t * pdu, /* any data to be sent - may be null */
unsigned pdu_len)
{ /* number of bytes of data */
int bytes_sent = 0;
struct mstp_pdu_packet *pkt;
unsigned i = 0;
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return 0;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return 0;
}
pkt = (struct mstp_pdu_packet *) Ringbuf_Data_Peek(&poSharedData->PDU_Queue);
if (pkt) {
pkt->data_expecting_reply =
BACNET_DATA_EXPECTING_REPLY(pdu[BACNET_PDU_CONTROL_BYTE_OFFSET]);
for (i = 0; i < pdu_len; i++) {
pkt->buffer[i] = pdu[i];
}
pkt->length = pdu_len;
pkt->destination_mac = dest->mac[0];
if (Ringbuf_Data_Put(&poSharedData->PDU_Queue, (uint8_t *)pkt)) {
bytes_sent = pdu_len;
}
}
return bytes_sent;
}
uint16_t dlmstp_receive(
void *poPort,
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;
struct timespec abstime;
int rv = 0;
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return 0;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return 0;
}
(void) max_pdu;
/* see if there is a packet available, and a place
to put the reply (if necessary) and process it */
get_abstime(&abstime, timeout);
rv = sem_timedwait(&poSharedData->Receive_Packet_Flag, &abstime);
if (rv == 0) {
if (poSharedData->Receive_Packet.ready) {
if (poSharedData->Receive_Packet.pdu_len) {
poSharedData->MSTP_Packets++;
if (src) {
memmove(src, &poSharedData->Receive_Packet.address,
sizeof(poSharedData->Receive_Packet.address));
}
if (pdu) {
memmove(pdu, &poSharedData->Receive_Packet.pdu,
sizeof(poSharedData->Receive_Packet.pdu));
}
pdu_len = poSharedData->Receive_Packet.pdu_len;
}
poSharedData->Receive_Packet.ready = false;
}
}
return pdu_len;
}
void *dlmstp_receive_fsm_task(
void *pArg)
{
bool received_frame;
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *) pArg;
if (!mstp_port) {
return NULL;
}
poSharedData =
(SHARED_MSTP_DATA *) ((struct mstp_port_struct_t *) pArg)->UserData;
if (!poSharedData) {
return NULL;
}
for (;;) {
/* 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((volatile struct mstp_port_struct_t *)
pArg);
received_frame = mstp_port->ReceivedValidFrame ||
mstp_port->ReceivedInvalidFrame;
if (received_frame) {
pthread_cond_signal(&poSharedData->Received_Frame_Flag);
break;
}
} while (mstp_port->DataAvailable);
}
}
return NULL;
}
void *dlmstp_master_fsm_task(
void *pArg)
{
uint32_t silence = 0;
bool run_master = false;
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *) pArg;
if (!mstp_port) {
return NULL;
}
poSharedData =
(SHARED_MSTP_DATA *) ((struct mstp_port_struct_t *) pArg)->UserData;
if (!poSharedData) {
return NULL;
}
for (;;) {
if (mstp_port->ReceivedValidFrame == false &&
mstp_port->ReceivedInvalidFrame == false) {
RS485_Check_UART_Data(mstp_port);
MSTP_Receive_Frame_FSM(mstp_port);
}
if (mstp_port->ReceivedValidFrame || mstp_port->ReceivedInvalidFrame) {
run_master = true;
} else {
silence = mstp_port->SilenceTimer(NULL);
switch (mstp_port->master_state) {
case MSTP_MASTER_STATE_IDLE:
if (silence >= Tno_token)
run_master = true;
break;
case MSTP_MASTER_STATE_WAIT_FOR_REPLY:
if (silence >= poSharedData->Treply_timeout)
run_master = true;
break;
case MSTP_MASTER_STATE_POLL_FOR_MASTER:
if (silence >= poSharedData->Tusage_timeout)
run_master = true;
break;
default:
run_master = true;
break;
}
}
if (run_master) {
if (mstp_port->This_Station <= DEFAULT_MAX_MASTER) {
while (MSTP_Master_Node_FSM(mstp_port)) {
/* do nothing while immediate transitioning */
}
} else if (mstp_port->This_Station < 255) {
MSTP_Slave_Node_FSM(mstp_port);
}
}
}
return NULL;
}
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;
SHARED_MSTP_DATA *poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return 0;
}
if (!poSharedData->Receive_Packet.ready) {
/* bounds check - maybe this should send an abort? */
pdu_len = mstp_port->DataLength;
if (pdu_len > sizeof(poSharedData->Receive_Packet.pdu))
pdu_len = sizeof(poSharedData->Receive_Packet.pdu);
memmove((void *) &poSharedData->Receive_Packet.pdu[0],
(void *) &mstp_port->InputBuffer[0], pdu_len);
dlmstp_fill_bacnet_address(&poSharedData->Receive_Packet.address,
mstp_port->SourceAddress);
poSharedData->Receive_Packet.pdu_len = mstp_port->DataLength;
poSharedData->Receive_Packet.ready = true;
sem_post(&poSharedData->Receive_Packet_Flag);
}
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 frame_type = 0;
struct mstp_pdu_packet *pkt;
SHARED_MSTP_DATA *poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return 0;
}
(void) timeout;
if (Ringbuf_Empty(&poSharedData->PDU_Queue)) {
return 0;
}
pkt = (struct mstp_pdu_packet *) Ringbuf_Peek(&poSharedData->PDU_Queue);
if (pkt->data_expecting_reply) {
frame_type = FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY;
} else {
frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
}
/* convert the PDU into the MSTP Frame */
pdu_len = MSTP_Create_Frame(&mstp_port->OutputBuffer[0], /* <-- loading this */
mstp_port->OutputBufferSize, frame_type, pkt->destination_mac,
mstp_port->This_Station, (uint8_t *) & pkt->buffer[0], pkt->length);
(void) Ringbuf_Pop(&poSharedData->PDU_Queue, NULL);
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,
uint8_t 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) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "Request is Network message.\n");
#endif
return false;
}
request.pdu_type = request_pdu[offset] & 0xF0;
if (request.pdu_type != PDU_TYPE_CONFIRMED_SERVICE_REQUEST) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "Not Confirmed Request.\n");
#endif
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 */
reply.address.mac[0] = dest_address;
reply.address.mac_len = 1;
offset =
npdu_decode(&reply_pdu[0], &reply.address, NULL, &reply.npdu_data);
if (reply.npdu_data.network_layer_message) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "Reply is Network message.\n");
#endif
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) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "Invoke ID mismatch.\n");
#endif
return false;
}
} else {
if (request.invoke_id != reply.invoke_id) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "Invoke ID mismatch.\n");
#endif
return false;
}
if (request.service_choice != reply.service_choice) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "Service choice mismatch.\n");
#endif
return false;
}
}
if (request.npdu_data.protocol_version != reply.npdu_data.protocol_version) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: "
"NPDU Protocol Version mismatch.\n");
#endif
return false;
}
#if 0
/* the NDPU priority doesn't get passed through the stack, and
all outgoing messages have NORMAL priority */
if (request.npdu_data.priority != reply.npdu_data.priority) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "NPDU Priority mismatch.\n");
#endif
return false;
}
#endif
if (!bacnet_address_same(&request.address, &reply.address)) {
#if PRINT_ENABLED
fprintf(stderr,
"DLMSTP: DER Compare failed: " "BACnet Address mismatch.\n");
#endif
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 */
bool matched = false;
uint8_t frame_type = 0;
struct mstp_pdu_packet *pkt;
SHARED_MSTP_DATA *poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return 0;
}
if (Ringbuf_Empty(&poSharedData->PDU_Queue)) {
return 0;
}
pkt = (struct mstp_pdu_packet *) Ringbuf_Peek(&poSharedData->PDU_Queue);
/* is this the reply to the DER? */
matched =
dlmstp_compare_data_expecting_reply(&mstp_port->InputBuffer[0],
mstp_port->DataLength, mstp_port->SourceAddress,
(uint8_t *) & pkt->buffer[0], pkt->length, pkt->destination_mac);
if (!matched) {
/* Walk the rest of the ring buffer to see if we can find a match */
while (!matched &&
(pkt = (struct mstp_pdu_packet *)Ringbuf_Peek_Next(&poSharedData->PDU_Queue, (uint8_t *)pkt)) != NULL) {
matched =
dlmstp_compare_data_expecting_reply(&mstp_port->InputBuffer[0],
mstp_port->DataLength,
mstp_port->SourceAddress,
(uint8_t *) & pkt->buffer[0],
pkt->length,
pkt->destination_mac);
}
if (!matched) {
/* Still didn't find a match so just bail out */
return 0;
}
}
if (pkt->data_expecting_reply) {
frame_type = FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY;
} else {
frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
}
/* convert the PDU into the MSTP Frame */
pdu_len = MSTP_Create_Frame(&mstp_port->OutputBuffer[0], /* <-- loading this */
mstp_port->OutputBufferSize, frame_type, pkt->destination_mac,
mstp_port->This_Station, (uint8_t *) & pkt->buffer[0], pkt->length);
/* This will pop the element no matter where we found it */
(void) Ringbuf_Pop_Element(&poSharedData->PDU_Queue, (uint8_t *)pkt, NULL);
return pdu_len;
}
void dlmstp_set_mac_address(
void *poPort,
uint8_t mac_address)
{
/* SHARED_MSTP_DATA * poSharedData; */
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
/*
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if(!poSharedData)
{
return;
}
*/
/* 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(mstp_port, mac_address);
}
return;
}
uint8_t dlmstp_mac_address(
void *poPort)
{
/* SHARED_MSTP_DATA * poSharedData; */
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return 0;
}
/* poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if(!poSharedData)
{
return 0;
}
*/
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(
void *poPort,
uint8_t max_info_frames)
{
/* SHARED_MSTP_DATA * poSharedData; */
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
/*
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if(!poSharedData)
{
return;
}
*/
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 *poPort)
{
/* SHARED_MSTP_DATA * poSharedData; */
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return 0;
}
/*
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if(!poSharedData)
{
return 0;
}
*/
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(
void *poPort,
uint8_t max_master)
{
/* SHARED_MSTP_DATA * poSharedData; */
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
/*
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if(!poSharedData)
{
return;
}
*/
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 *poPort)
{
/* SHARED_MSTP_DATA * poSharedData; */
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return 0;
}
/*
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if(!poSharedData)
{
return 0;
}
*/
return mstp_port->Nmax_master;
}
/* RS485 Baud Rate 9600, 19200, 38400, 57600, 115200 */
void dlmstp_set_baud_rate(
void *poPort,
uint32_t baud)
{
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return;
}
switch (baud) {
case 9600:
poSharedData->RS485_Baud = B9600;
break;
case 19200:
poSharedData->RS485_Baud = B19200;
break;
case 38400:
poSharedData->RS485_Baud = B38400;
break;
case 57600:
poSharedData->RS485_Baud = B57600;
break;
case 115200:
poSharedData->RS485_Baud = B115200;
break;
default:
break;
}
}
uint32_t dlmstp_baud_rate(
void *poPort)
{
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return false;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return false;
}
switch (poSharedData->RS485_Baud) {
case B19200:
return 19200;
case B38400:
return 38400;
case B57600:
return 57600;
case B115200:
return 115200;
default:
case B9600:
return 9600;
}
}
void dlmstp_get_my_address(
void *poPort,
BACNET_ADDRESS * my_address)
{
int i = 0; /* counter */
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return;
}
poSharedData = (SHARED_MSTP_DATA *) mstp_port->UserData;
if (!poSharedData) {
return;
}
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(
void *poPort,
char *ifname)
{
unsigned long hThread = 0;
int rv = 0;
SHARED_MSTP_DATA *poSharedData;
struct mstp_port_struct_t *mstp_port =
(struct mstp_port_struct_t *) poPort;
if (!mstp_port) {
return false;
}
poSharedData = (SHARED_MSTP_DATA *) ((struct mstp_port_struct_t *)
mstp_port)->UserData;
if (!poSharedData) {
return false;
}
poSharedData->RS485_Port_Name = ifname;
/* initialize PDU queue */
Ringbuf_Init(&poSharedData->PDU_Queue,
(uint8_t *) & poSharedData->PDU_Buffer, sizeof(struct mstp_pdu_packet),
MSTP_PDU_PACKET_COUNT);
/* initialize packet queue */
poSharedData->Receive_Packet.ready = false;
poSharedData->Receive_Packet.pdu_len = 0;
rv = sem_init(&poSharedData->Receive_Packet_Flag, 0, 0);
if (rv != 0) {
fprintf(stderr,
"MS/TP Interface: %s\n cannot allocate PThread Condition.\n",
ifname);
exit(1);
}
struct termios newtio;
printf("RS485: Initializing %s", poSharedData->RS485_Port_Name);
/*
Open device for reading and writing.
Blocking mode - more CPU effecient
*/
poSharedData->RS485_Handle =
open(poSharedData->RS485_Port_Name,
O_RDWR | O_NOCTTY | O_NONBLOCK /*| O_NDELAY */ );
if (poSharedData->RS485_Handle < 0) {
perror(poSharedData->RS485_Port_Name);
exit(-1);
}
#if 0
/* non blocking for the read */
fcntl(poSharedData->RS485_Handle, F_SETFL, FNDELAY);
#else
/* efficient blocking for the read */
fcntl(poSharedData->RS485_Handle, F_SETFL, 0);
#endif
/* save current serial port settings */
tcgetattr(poSharedData->RS485_Handle, &poSharedData->RS485_oldtio);
/* clear struct for new port settings */
bzero(&newtio, sizeof(newtio));
/*
BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed.
CRTSCTS : output hardware flow control (only used if the cable has
all necessary lines. See sect. 7 of Serial-HOWTO)
CLOCAL : local connection, no modem contol
CREAD : enable receiving characters
*/
newtio.c_cflag =
poSharedData->RS485_Baud | poSharedData->RS485MOD | CLOCAL | CREAD;
/* Raw input */
newtio.c_iflag = 0;
/* Raw output */
newtio.c_oflag = 0;
/* no processing */
newtio.c_lflag = 0;
/* activate the settings for the port after flushing I/O */
tcsetattr(poSharedData->RS485_Handle, TCSAFLUSH, &newtio);
/* flush any data waiting */
usleep(200000);
tcflush(poSharedData->RS485_Handle, TCIOFLUSH);
/* ringbuffer */
FIFO_Init(&poSharedData->Rx_FIFO, poSharedData->Rx_Buffer,
sizeof(poSharedData->Rx_Buffer));
printf("=success!\n");
mstp_port->InputBuffer = &poSharedData->RxBuffer[0];
mstp_port->InputBufferSize = sizeof(poSharedData->RxBuffer);
mstp_port->OutputBuffer = &poSharedData->TxBuffer[0];
mstp_port->OutputBufferSize = sizeof(poSharedData->TxBuffer);
gettimeofday(&poSharedData->start, NULL);
mstp_port->SilenceTimer = Timer_Silence;
mstp_port->SilenceTimerReset = Timer_Silence_Reset;
MSTP_Init(mstp_port);
#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
rv = pthread_create(&hThread, NULL, dlmstp_master_fsm_task, mstp_port);
if (rv != 0) {
fprintf(stderr, "Failed to start Master Node FSM task\n");
}
return true;
}
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