skarg
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2004 Steve Karg
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307
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USA.
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As a special exception, if other files instantiate templates or
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use macros or inline functions from this file, or you compile
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this file and link it with other works to produce a work based
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on this file, this file does not by itself cause the resulting
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work to be covered by the GNU General Public License. However
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the source code for this file must still be made available in
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accordance with section (3) of the GNU General Public License.
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This exception does not invalidate any other reasons why a work
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based on this file might be covered by the GNU General Public
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License.
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-------------------------------------------
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####COPYRIGHTEND####*/
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/* The module handles sending data out the RS-485 port */
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/* and handles receiving data from the RS-485 port. */
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/* Customize this file for your specific hardware */
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include "mstp.h"
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/* Transmits a Frame on the wire */
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void RS485_Send_Frame(struct mstp_port_struct_t *mstp_port, /* port specific data */
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uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
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uint16_t nbytes)
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{ /* number of bytes of data (up to 501) */
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/* in order to avoid line contention */
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while (mstp_port->Turn_Around_Waiting) {
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/* wait, yield, or whatever */
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}
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/* Disable the receiver, and enable the transmit line driver. */
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while (nbytes) {
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putc(*buffer, stderr);
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buffer++;
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nbytes--;
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}
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/* Wait until the final stop bit of the most significant CRC octet */
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/* has been transmitted but not more than Tpostdrive. */
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/* Disable the transmit line driver. */
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return;
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}
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/* called by timer, interrupt(?) or other thread */
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void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
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{
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if (mstp_port->ReceiveError == true) {
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/* wait for state machine to clear this */
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}
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/* wait for state machine to read from the DataRegister */
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else if (mstp_port->DataAvailable == false) {
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/* check for data */
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/* if error, */
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/* ReceiveError = TRUE; */
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/* return; */
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mstp_port->DataRegister = 0; /* FIXME: Get this data from UART or buffer */
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/* if data is ready, */
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/* DataAvailable = TRUE; */
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/* return; */
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}
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}
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