dali/bacnet_stack
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Rewrote MS/TP to minimize memory usage. Compiles, but untested.

Browse Source
This commit is contained in:
skarg
2007-09-05 23:13:15 +00:00
parent 794362580b
commit 17ceb11d3c
5 changed files with 1235 additions and 308 deletions
Download Patch File Download Diff File Expand all files Collapse all files
bacnet-stack/ports/atmega168/Makefile
-1
View File
@@ -20,7 +20,6 @@ CSRC = main.c \
../../npdu.c \
../../bacint.c \
../../bacaddr.c \
../../mstp.c \
../../crc.c
DEMOSRC = h_rp.c \
bacnet-stack/ports/atmega168/dlmstp.c
+1090 -231
View File
File diff suppressed because it is too large Load Diff
bacnet-stack/ports/atmega168/main.c
+1 -1
View File
@@ -117,7 +117,7 @@ int main(void)
task_milliseconds();
/* other tasks */
/* BACnet handling */
pdu_len = datalink_receive(&src, &PDUBuffer[0], MAX_MPDU, 0);
pdu_len = datalink_receive(&src, &PDUBuffer[0], sizeof(PDUBuffer), 0);
if (pdu_len) {
//npdu_handler(&src, &PDUBuffer[0], pdu_len);
}
bacnet-stack/ports/atmega168/rs485.c
+101 -44
View File
@@ -35,10 +35,23 @@
/* This file has been customized for use with ATMEGA168 */
#include "hardware.h"
#include "timer.h"
/* baud rate */
static uint32_t RS485_Baud = 38400;
/* The minimum time after the end of the stop bit of the final octet of a */
/* received frame before a node may enable its EIA-485 driver: 40 bit times. */
/* At 9600 baud, 40 bit times would be about 4.166 milliseconds */
/* At 19200 baud, 40 bit times would be about 2.083 milliseconds */
/* At 38400 baud, 40 bit times would be about 1.041 milliseconds */
/* At 57600 baud, 40 bit times would be about 0.694 milliseconds */
/* At 76800 baud, 40 bit times would be about 0.520 milliseconds */
/* At 115200 baud, 40 bit times would be about 0.347 milliseconds */
/* 40 bits is 4 octets including a start and stop bit with each octet */
#define Tturnaround (40UL)
/* turnaround_time_milliseconds = (Tturnaround*1000UL)/RS485_Baud; */
/****************************************************************************
* DESCRIPTION: Initializes the RS485 hardware and variables, and starts in
* receive mode.
@@ -61,15 +74,13 @@ void RS485_Initialize(void)
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
/* Clear Power Reduction USART0 */
BIT_CLEAR(PRR,PRUSART0);
/* Use port PD2 for RTS - enable and disable of Transceiver Tx/Rx */
/* Set port bit as Output */
BIT_SET(DDRD,DDD2);
return;
}
void RS485_Cleanup(void)
{
}
/****************************************************************************
* DESCRIPTION: Returns the baud rate that we are currently running at
* RETURN: none
@@ -83,7 +94,7 @@ uint32_t RS485_Get_Baud_Rate(void)
/****************************************************************************
* DESCRIPTION: Sets the baud rate for the chip USART
* RETURN: none
* RETURN: true if valid baud rate
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
@@ -113,23 +124,50 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
return valid;
}
/* Transmits a Frame on the wire */
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes) /* number of bytes of data (up to 501) */
/****************************************************************************
* DESCRIPTION: Waits on the SilenceTimer for 40 bits.
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Turnaround_Delay(void)
{
uint8_t turnaround_time;
uint16_t turnaround_time;
/* delay after reception before trasmitting - per MS/TP spec */
/* wait a minimum 40 bit times since reception */
/* at least 1 ms for errors: rounding, clock tick */
turnaround_time = 1 + ((Tturnaround*1000UL)/RS485_Baud);
while (Timer_Silence() < turnaround_time) {
/* do nothing - wait for timer to increment */
};
}
/* delay after reception - per MS/TP spec */
if (mstp_port) {
/* wait a minimum 40 bit times since reception */
/* at least 1 ms for errors: rounding, clock tick */
turnaround_time = 1 + ((Tturnaround*1000UL)/RS485_Baud);
while (mstp_port->SilenceTimer() < turnaround_time) {
/* do nothing - wait for timer to increment */
};
/****************************************************************************
* DESCRIPTION: Enable or disable the transmitter
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Transmitter_Enable(bool enable)
{
if (enable) {
BIT_SET(PORTD,PD2);
} else {
BIT_CLEAR(PORTD,PD2);
}
}
/****************************************************************************
* DESCRIPTION: Send some data and wait until it is sent
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Send_Data(
uint8_t * buffer, /* data to send */
uint8_t nbytes) /* number of bytes of data */
{
while (nbytes) {
while (!BIT_CHECK(UCSR0A,UDRE0)) {
/* do nothing - wait until Tx buffer is empty */
@@ -142,34 +180,53 @@ void RS485_Send_Frame(
/* do nothing - wait until the entire frame in the
Transmit Shift Register has been shifted out */
}
/* per MSTP spec */
if (mstp_port) {
mstp_port->SilenceTimerReset();
}
return;
}
/* called by timer, interrupt(?) or other thread */
void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
/****************************************************************************
* DESCRIPTION: Return true if a framing or overrun error is present
* RETURN: true if error
* ALGORITHM: none
* NOTES: Clears any error flags.
*****************************************************************************/
bool RS485_ReceiveError(void)
{
if (mstp_port->ReceiveError == true) {
/* wait for state machine to clear this */
}
/* wait for state machine to read from the DataRegister */
else if (mstp_port->DataAvailable == false) {
/* check for error */
if (BIT_CHECK(UCSR0A,FE0)) {
mstp_port->ReceiveError = true;
}
bool uart_error = false;
uint8_t dummy_data;
if (BIT_CHECK(UCSR0A,DOR0)) {
mstp_port->ReceiveError = true;
}
/* check for data */
if (BIT_CHECK(UCSR0A,RXC0)) {
mstp_port->DataRegister = UDR0;
mstp_port->DataAvailable = true;
/* check for framing error */
if (BIT_CHECK(UCSR0A,FE0)) {
uart_error = true;
}
/* check for overrun error */
if (BIT_CHECK(UCSR0A,DOR0)) {
uart_error = true;
}
/* flush the receive buffer */
if (uart_error) {
while (BIT_CHECK(UCSR0A,RXC0)) {
dummy_data = UDR0;
}
}
return uart_error;
}
/****************************************************************************
* DESCRIPTION: Return true if data is available
* RETURN: true if data is available, with the data in the parameter set
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
bool RS485_DataAvailable(uint8_t *data)
{
bool uart_data = false;
/* check for data */
if (BIT_CHECK(UCSR0A,RXC0)) {
*data = UDR0;
uart_data = true;
}
return uart_data;
}
bacnet-stack/ports/atmega168/rs485.h
+43 -31
View File
@@ -1,33 +1,42 @@
/**************************************************************************
*
* Copyright (C) 2007 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.
*
*********************************************************************/
/*####COPYRIGHTBEGIN####
-------------------------------------------
Copyright (C) 2004 Steve Karg
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 2
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, write to:
The Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307
USA.
As a special exception, if other files instantiate templates or
use macros or inline functions from this file, or you compile
this file and link it with other works to produce a work based
on this file, this file does not by itself cause the resulting
work to be covered by the GNU General Public License. However
the source code for this file must still be made available in
accordance with section (3) of the GNU General Public License.
This exception does not invalidate any other reasons why a work
based on this file might be covered by the GNU General Public
License.
-------------------------------------------
####COPYRIGHTEND####*/
#ifndef RS485_H
#define RS485_H
#include <stdint.h>
#include "mstp.h"
#ifdef __cplusplus
extern "C" {
@@ -35,14 +44,17 @@ extern "C" {
void RS485_Initialize(void);
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes); /* number of bytes of data (up to 501) */
void RS485_Transmitter_Enable(bool enable);
uint8_t RS485_Check_UART_Data(
volatile struct mstp_port_struct_t *mstp_port); /* port specific data */
/* NOTE: Only able to send up to 255 bytes at a time */
void RS485_Send_Data(
uint8_t * buffer, /* data to send */
uint8_t nbytes); /* number of bytes of data */
bool RS485_ReceiveError(void);
bool RS485_DataAvailable(uint8_t *data);
void RS485_Turnaround_Delay(void);
uint32_t RS485_Get_Baud_Rate(void);
bool RS485_Set_Baud_Rate(uint32_t baud);