skarg
155 lines
4.9 KiB
C
155 lines
4.9 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*********************************************************************/
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#include <stdint.h>
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#include <rtkernel.h>
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#include <rtcom.h>
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#include <itimer.h>
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#include "mstp.h"
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/* note: use the RTKernel-C API so that it can use this library */
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#define RS485_IO_ENABLE(p) ModemControl(p,0,DTR);
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#define RS485_TRANSMIT_ENABLE(p) ModemControl(p,1,RTS);
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#define RS485_RECEIVE_ENABLE(p) ModemControl(p,0,RTS);
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/* COM port number - COM1 = 0 */
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static int RS485_Port = COM2;
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/* baud rate */
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static long RS485_Baud = 38400;
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/* io base address */
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static long RS485_Base = 0;
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/* hardware IRQ number */
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static long RS485_IRQ_Number = 0;
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static void RS485_Standard_Port_Settings(long port, long *pIRQ,
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long *pBase)
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{
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switch (port) {
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case COM1:
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*pBase = (long) 0x3F8;
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*pIRQ = 4L;
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break;
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case COM2:
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*pBase = (long) 0x2F8;
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*pIRQ = 3L;
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break;
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case COM3:
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*pBase = (long) 0x3E8;
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*pIRQ = 4L;
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break;
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case COM4:
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*pBase = (long) 0x2E8;
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*pIRQ = 3L;
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break;
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default:
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break;
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}
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}
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static RS485_Open_Port(int port, /* COM port number - COM1 = 0 */
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long baud, /* baud rate */
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unsigned base, /* io base address */
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int irq)
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{ /* hardware IRQ number */
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/* setup the COM IO */
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SetIOBase(port, base);
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SetIRQ(port, irq);
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if (irq < 8)
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RTKIRQTopPriority(irq, 9);
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InitPort(port, baud, PARITY_NONE, 1, 8);
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if (HasFIFO(port))
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EnableFIFO(port, 8);
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EnableCOMInterrupt(port, 1024 * 4);
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/* enable the 485 via the DTR pin */
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RS485_IO_ENABLE(port);
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RS485_RECEIVE_ENABLE(port);
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return;
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}
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void RS485_Initialize(void)
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{
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RS485_Standard_Port_Settings(RS485_Port, &RS485_IRQ_Number,
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&RS485_Base);
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RS485_Open_Port(RS485_Port, RS485_Baud, RS485_Base, RS485_IRQ_Number);
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}
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void RS485_Send_Frame(volatile 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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bool status = true; /* return value */
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(void) mstp_port;
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RS485_TRANSMIT_ENABLE(RS485_Port);
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SendBlock(RS485_Port, (char *) buffer, nbytes);
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/* need to wait at least 9600 baud * 512 bytes = 54mS */
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(void) WaitSendBufferEmpty(RS485_Port, MilliSecsToTicks(200));
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while (!(LineStatus(RS485_Port) & TX_SHIFT_EMPTY))
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RTKScheduler();
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RS485_RECEIVE_ENABLE(RS485_Port);
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return;
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}
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void RS485_Check_UART_Data(volatile struct mstp_port_struct_t *mstp_port)
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{ /* port specific data */
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COMData com_data = 0; /* byte from COM driver */
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unsigned timeout = 10; /* milliseconds to wait for a character */
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Duration ticks; /* duration to wait for data */
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if (mstp_port->ReceiveError) {
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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) {
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/* check for data */
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ticks = MilliSecsToTicks(timeout);
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if (!ticks)
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ticks = 1;
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if (RTKGetTimed(ReceiveBuffer[RS485_Port], &com_data, ticks)) {
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/* if error, */
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if (com_data & (COM_OVERRUN << 8))
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mstp_port->ReceiveError = true;
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else if (com_data & (COM_FRAME << 8))
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mstp_port->ReceiveError = true;
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else {
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mstp_port->DataRegister = com_data & 0x00FF;
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mstp_port->DataAvailable = true;
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}
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}
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}
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}
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void RS485_Process_Tx_Message(void)
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{
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/* nothing to do */
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}
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