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4095a7f3350b1b80a06d31989039f693b5bce4d5
bacnet_stack/ports/bsd/dlmstp_port.c
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Steve Karg 4095a7f335 Feature/mstp valid frame not for us stats (#1053) 
* Fixed ISO C90 forbids mixed declarations and code warning.

* Fixed the MS/TP invalid frame counter that was incremented for valid frames not for us.
2025-08-01 09:58:45 -05:00

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/**
* @file
* @brief Provides BSD-specific DataLink functions for MS/TP.
* @author Steve Karg <skarg@users.sourceforge.net>
* @date 2008
* @copyright SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
*/
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/time.h>
#include <errno.h>
/* BSD includes */
#include <IOKit/serial/ioss.h>
/* BACnet Stack defines - first */
#include "bacnet/bacdef.h"
/* BACnet Stack API */
#include "bacnet/bacdef.h"
#include "bacnet/bacaddr.h"
#include "bacnet/npdu.h"
#include "bacnet/datalink/mstp.h"
#include "bacnet/basic/sys/ringbuf.h"
#include "bacnet/basic/sys/debug.h"
/* port specific */
#include "dlmstp_port.h"
#include "rs485.h"
/* OS Specific include */
#include "bacport.h"
#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++; \
}
/**
* Calculate the time difference between two timespec values.
*
* @param l - The minued (time from which we subtract).
* @param r - The subtrahend (time that is being subtracted).
*
* @returns True if the difference is negative, otherwise 0.
*/
static int timespec_subtract(
struct timespec *result, const struct timespec *l, const struct timespec *r)
{
#define NS_PER_S 1000000000 /* nano-seconds per second */
struct timespec right = *r;
int secs;
/* Perform the carry for the later subtraction by updating y. */
if (l->tv_nsec < right.tv_nsec) {
secs = (right.tv_nsec - l->tv_nsec) / NS_PER_S + 1;
right.tv_nsec -= NS_PER_S * secs;
right.tv_sec += secs;
}
if (l->tv_nsec - right.tv_nsec > NS_PER_S) {
secs = (l->tv_nsec - right.tv_nsec) / NS_PER_S;
right.tv_nsec += NS_PER_S * secs;
right.tv_sec -= secs;
}
/* Compute the time remaining. tv_nsec is certainly positive. */
result->tv_sec = l->tv_sec - right.tv_sec;
result->tv_nsec = l->tv_nsec - right.tv_nsec;
return l->tv_sec < right.tv_sec;
}
/**
* Add a certain number of nanoseconds to the specified time.
*
* @param ts - The time to which to add to.
* @param ns - The number of nanoseconds to add. Allowed range
* is -NS_PER_S..NS_PER_S (i.e., plus minus one second).
*/
static void timespec_add_ns(struct timespec *ts, long ns)
{
ts->tv_nsec += ns;
if (ts->tv_nsec > NS_PER_S) {
ts->tv_nsec -= NS_PER_S;
ts->tv_sec += 1;
} else if (ts->tv_nsec < 0) {
ts->tv_nsec += NS_PER_S;
ts->tv_sec -= 1;
}
}
static uint32_t Timer_Silence(void *poPort)
{
int32_t res;
struct timespec 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;
}
clock_gettime(CLOCK_MONOTONIC, &now);
timespec_subtract(&tmp_diff, &now, &poSharedData->start);
res = ((tmp_diff.tv_sec) * 1000 + (tmp_diff.tv_nsec) / 1000000);
return (res >= 0 ? res : -res);
}
static 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;
}
clock_gettime(CLOCK_MONOTONIC, &poSharedData->start);
}
static void get_abstime(struct timespec *abstime, unsigned long milliseconds)
{
clock_gettime(CLOCK_MONOTONIC, abstime);
if (milliseconds > 1000) {
fprintf(
stderr, "DLMSTP: limited timeout of %lums to 1000ms\n",
milliseconds);
milliseconds = 1000;
}
timespec_add_ns(abstime, 1000000 * milliseconds);
}
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);
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 = dispatch_semaphore_wait(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;
}
static 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->ReceivedValidFrameNotForUs == false) &&
(mstp_port->ReceivedInvalidFrame == false)) {
do {
RS485_Check_UART_Data(mstp_port);
MSTP_Receive_Frame_FSM((struct mstp_port_struct_t *)pArg);
received_frame = mstp_port->ReceivedValidFrame ||
mstp_port->ReceivedValidFrameNotForUs ||
mstp_port->ReceivedInvalidFrame;
if (received_frame) {
pthread_cond_signal(&poSharedData->Received_Frame_Flag);
break;
}
} while (mstp_port->DataAvailable);
}
}
return NULL;
}
static 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->ReceivedValidFrameNotForUs == false &&
mstp_port->ReceivedInvalidFrame == false) {
RS485_Check_UART_Data(mstp_port);
MSTP_Receive_Frame_FSM(mstp_port);
}
if (mstp_port->ReceivedValidFrame || mstp_port->ReceivedInvalidFrame ||
mstp_port->ReceivedValidFrameNotForUs) {
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 >= mstp_port->Treply_timeout) {
run_master = true;
}
break;
case MSTP_MASTER_STATE_POLL_FOR_MASTER:
if (silence >= mstp_port->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(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;
dispatch_semaphore_signal(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(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;
}
/**
* @brief Send an MSTP frame
* @param mstp_port - port specific data
* @param buffer - data to send
* @param nbytes - number of bytes of data to send
*/
void MSTP_Send_Frame(
struct mstp_port_struct_t *mstp_port,
const uint8_t *buffer,
uint16_t nbytes)
{
RS485_Send_Frame(mstp_port, buffer, nbytes);
}
static bool dlmstp_compare_data_expecting_reply(
const uint8_t *request_pdu,
uint16_t request_pdu_len,
uint8_t src_address,
const 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 */
(void)request_pdu_len;
(void)reply_pdu_len;
/* decode the request data */
request.address.mac[0] = src_address;
request.address.mac_len = 1;
offset = bacnet_npdu_decode(
request_pdu, request_pdu_len, NULL, &request.address,
&request.npdu_data);
if (request.npdu_data.network_layer_message) {
debug_printf("DLMSTP: DER Compare failed: "
"Request is Network message.\n");
return false;
}
request.pdu_type = request_pdu[offset] & 0xF0;
if (request.pdu_type != PDU_TYPE_CONFIRMED_SERVICE_REQUEST) {
debug_printf("DLMSTP: DER Compare failed: "
"Not Confirmed Request.\n");
return false;
}
request.invoke_id = request_pdu[offset + 2];
/* segmented message? */
if (request_pdu[offset] & BIT(3)) {
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 = bacnet_npdu_decode(
reply_pdu, reply_pdu_len, &reply.address, NULL, &reply.npdu_data);
if (reply.npdu_data.network_layer_message) {
debug_printf("DLMSTP: DER Compare failed: "
"Reply is Network message.\n");
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_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] & BIT(3)) {
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:
case PDU_TYPE_SEGMENT_ACK:
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) ||
(reply.pdu_type == PDU_TYPE_SEGMENT_ACK)) {
if (request.invoke_id != reply.invoke_id) {
debug_printf("DLMSTP: DER Compare failed: "
"Invoke ID mismatch.\n");
return false;
}
} else {
if (request.invoke_id != reply.invoke_id) {
debug_printf("DLMSTP: DER Compare failed: "
"Invoke ID mismatch.\n");
return false;
}
if (request.service_choice != reply.service_choice) {
debug_printf("DLMSTP: DER Compare failed: "
"Service choice mismatch.\n");
return false;
}
}
if (request.npdu_data.protocol_version !=
reply.npdu_data.protocol_version) {
debug_printf("DLMSTP: DER Compare failed: "
"NPDU Protocol Version mismatch.\n");
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) {
debug_printf(
"DLMSTP: DER Compare failed: " "NPDU Priority mismatch.\n");
return false;
}
#endif
if (!bacnet_address_same(&request.address, &reply.address)) {
debug_printf("DLMSTP: DER Compare failed: "
"BACnet Address mismatch.\n");
return false;
}
return true;
}
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(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;
(void)timeout;
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)
{
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
if (!mstp_port) {
return;
}
/* Master Nodes can only have address 0-127 */
if (mac_address <= 127) {
mstp_port->This_Station = mac_address;
if (mac_address > mstp_port->Nmax_master) {
dlmstp_set_max_master(mstp_port, mac_address);
}
}
return;
}
uint8_t dlmstp_mac_address(void *poPort)
{
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
if (!mstp_port) {
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)
{
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
if (!mstp_port) {
return;
}
if (max_info_frames >= 1) {
mstp_port->Nmax_info_frames = max_info_frames;
}
return;
}
uint8_t dlmstp_max_info_frames(void *poPort)
{
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
if (!mstp_port) {
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)
{
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
if (!mstp_port) {
return;
}
if (max_master <= 127) {
if (mstp_port->This_Station <= max_master) {
mstp_port->Nmax_master = max_master;
}
}
return;
}
uint8_t dlmstp_max_master(void *poPort)
{
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
if (!mstp_port) {
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)
{
pthread_t hThread = 0;
int rv = 0;
SHARED_MSTP_DATA *poSharedData;
struct termios newtio;
struct mstp_port_struct_t *mstp_port = (struct mstp_port_struct_t *)poPort;
dispatch_semaphore_t *sem = NULL;
int handshake;
unsigned long mics = 1UL;
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;
sem = &poSharedData->Receive_Packet_Flag;
*sem = dispatch_semaphore_create(0);
printf("RS485 Port: Initializing %s\n", 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 (ioctl(poSharedData->RS485_Handle, TIOCEXCL) == -1) {
printf(
"Error setting TIOCEXCL on %s - %s(%d).\n",
poSharedData->RS485_Port_Name, strerror(errno), errno);
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
*/
printf(
"Default/current input baud rate is %d\n",
(int)cfgetispeed(&poSharedData->RS485_oldtio));
printf(
"Default/current output baud rate is %d\n",
(int)cfgetospeed(&poSharedData->RS485_oldtio));
newtio.c_cc[VMIN] = 0;
newtio.c_cc[VTIME] = 10;
// newtio.c_cflag =
// poSharedData->RS485_Baud | poSharedData->RS485MOD | CLOCAL | CREAD;
cfsetspeed(&newtio, poSharedData->RS485_Baud);
newtio.c_cflag &= ~PARENB; /* No Parity */
newtio.c_cflag &= ~CSTOPB; /* 1 Stop Bit */
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS8; /* Use 8 bit words */
/* Raw input */
newtio.c_iflag = 0;
/* Raw output */
newtio.c_oflag = 0;
/* no processing */
newtio.c_lflag = 0;
if (ioctl(
poSharedData->RS485_Handle, IOSSIOSPEED,
&poSharedData->RS485_Baud) == -1) {
printf(
"Error calling ioctl(..., IOSSIOSPEED, ...) %s - %s(%d).\n",
poSharedData->RS485_Port_Name, strerror(errno), errno);
}
printf("Input baud rate changed to %d\n", (int)cfgetispeed(&newtio));
printf("Output baud rate changed to %d\n", (int)cfgetospeed(&newtio));
/* activate the settings for the port after flushing I/O */
tcsetattr(poSharedData->RS485_Handle, TCSANOW, &newtio);
/* To set the modem handshake lines, use the following ioctls.
See tty(4) <x-man-page//4/tty> and ioctl(2) <x-man-page//2/ioctl> for
details.*/
/* Assert Data Terminal Ready (DTR) */
if (ioctl(poSharedData->RS485_Handle, TIOCSDTR) == -1) {
printf(
"Error asserting DTR %s - %s(%d).\n", poSharedData->RS485_Port_Name,
strerror(errno), errno);
}
/* Clear Data Terminal Ready (DTR) */
if (ioctl(poSharedData->RS485_Handle, TIOCCDTR) == -1) {
printf(
"Error clearing DTR %s - %s(%d).\n", poSharedData->RS485_Port_Name,
strerror(errno), errno);
}
/* Set the modem lines depending on the bits set in handshake */
handshake = TIOCM_DTR | TIOCM_RTS | TIOCM_CTS | TIOCM_DSR;
if (ioctl(poSharedData->RS485_Handle, TIOCMSET, &handshake) == -1) {
printf(
"Error setting handshake lines %s - %s(%d).\n",
poSharedData->RS485_Port_Name, strerror(errno), errno);
}
/* To read the state of the modem lines, use the following ioctl.
See tty(4) <x-man-page//4/tty> and ioctl(2) <x-man-page//2/ioctl> for
details. */
/* Store the state of the modem lines in handshake */
if (ioctl(poSharedData->RS485_Handle, TIOCMGET, &handshake) == -1) {
printf(
"Error getting handshake lines %s - %s(%d).\n",
poSharedData->RS485_Port_Name, strerror(errno), errno);
}
printf("Handshake lines currently set to %d\n", handshake);
if (ioctl(poSharedData->RS485_Handle, IOSSDATALAT, &mics) == -1) {
/* set latency to 1 microsecond */
printf(
"Error setting read latency %s - %s(%d).\n",
poSharedData->RS485_Port_Name, strerror(errno), errno);
exit(-1);
}
/* 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);
clock_gettime(CLOCK_MONOTONIC, &poSharedData->start);
mstp_port->SilenceTimer = Timer_Silence;
mstp_port->SilenceTimerReset = Timer_Silence_Reset;
MSTP_Init(mstp_port);
debug_fprintf(stderr, "MS/TP MAC: %02X\n", mstp_port->This_Station);
debug_fprintf(stderr, "MS/TP Max_Master: %02X\n", mstp_port->Nmax_master);
debug_fprintf(
stderr, "MS/TP Max_Info_Frames: %u\n", mstp_port->Nmax_info_frames);
rv = pthread_create(&hThread, NULL, dlmstp_master_fsm_task, mstp_port);
if (rv != 0) {
fprintf(stderr, "Failed to start Master Node FSM task\n");
}
/* You can try also this for thread. This here so we ignore
* -Wunused-function compiler warning
*/
dlmstp_receive_fsm_task(NULL);
return true;
}
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