--- /dev/null
+//---------------------------------------------------------------------------
+// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
+//
+// 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 DALLAS SEMICONDUCTOR 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.
+//
+// Except as contained in this notice, the name of Dallas Semiconductor
+// shall not be used except as stated in the Dallas Semiconductor
+// Branding Policy.
+//---------------------------------------------------------------------------
+//
+// ds2480ut.c - DS2480 utility functions.
+//
+// Version: 2.00
+//
+// History: 1.00 -> 1.01 Default PDSRC changed from 0.83 to 1.37V/us
+// in DS2480Detect. Changed to use msDelay instead
+// of Delay.
+// 1.01 -> 1.02 Changed global declarations from 'uchar' to 'int'.
+// Changed DSO/WORT from 7 to 10us in DS2480Detect.
+// 1.02 -> 1.03 Removed caps in #includes for Linux capatibility
+// 1.03 -> 2.00 Changed 'MLan' to 'ow'. Added support for
+// multiple ports. Changed W1LT to 8us.
+
+#include "ownet.h"
+#include "ds2480.h"
+
+// global DS2480 state
+int ULevel[MAX_PORTNUM]; // current DS2480 1-Wire Net level
+int UBaud[MAX_PORTNUM]; // current DS2480 baud rate
+int UMode[MAX_PORTNUM]; // current DS2480 command or data mode state
+int USpeed[MAX_PORTNUM]; // current DS2480 1-Wire Net communication speed
+
+//---------------------------------------------------------------------------
+// Attempt to resyc and detect a DS2480
+//
+// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
+// OpenCOM to indicate the port number.
+//
+// Returns: TRUE - DS2480 detected successfully
+// FALSE - Could not detect DS2480
+//
+int DS2480Detect(int portnum)
+{
+ uchar sendpacket[10],readbuffer[10];
+ short sendlen=0;
+ short rt=FALSE;
+
+ // reset modes
+ ULevel[portnum] = MODE_NORMAL;
+ UMode[portnum] = MODSEL_COMMAND;
+ UBaud[portnum] = PARMSET_9600;
+ USpeed[portnum] = SPEEDSEL_FLEX;
+
+ // set the baud rate to 9600
+ SetBaudCOM(portnum,(uchar)UBaud[portnum]);
+
+ // send a break to reset the DS2480
+ BreakCOM(portnum);
+
+ // delay to let line settle
+ msDelay(2);
+
+ // flush the buffers
+ FlushCOM(portnum);
+
+ // send the timing byte
+ sendpacket[0] = 0xC1;
+ if (WriteCOM(portnum,1,sendpacket) != 1)
+ return FALSE;
+
+ // set the FLEX configuration parameters
+ // default PDSRC = 1.37Vus
+ sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_SLEW | PARMSET_Slew1p37Vus;
+ // default W1LT = 8us
+ sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_WRITE1LOW | PARMSET_Write8us;
+ // default DSO/WORT = 10us
+ sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_SAMPLEOFFSET | PARMSET_SampOff10us;
+
+ // construct the command to read the baud rate (to test command block)
+ sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_PARMREAD | (PARMSEL_BAUDRATE >> 3);
+
+ // also do 1 bit operation (to test 1-Wire block)
+ sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_BIT | UBaud[portnum] | BITPOL_ONE;
+
+ // flush the buffers
+ FlushCOM(portnum);
+
+ // send the packet
+ if (WriteCOM(portnum,sendlen,sendpacket))
+ {
+ // read back the response
+ if (ReadCOM(portnum,5,readbuffer) == 5)
+ {
+ // look at the baud rate and bit operation
+ // to see if the response makes sense
+ if (((readbuffer[3] & 0xF1) == 0x00) &&
+ ((readbuffer[3] & 0x0E) == UBaud[portnum]) &&
+ ((readbuffer[4] & 0xF0) == 0x90) &&
+ ((readbuffer[4] & 0x0C) == UBaud[portnum]))
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+//---------------------------------------------------------------------------
+// Change the DS2480 from the current baud rate to the new baud rate.
+//
+// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
+// OpenCOM to indicate the port number.
+// 'newbaud' - the new baud rate to change to, defined as:
+// PARMSET_9600 0x00
+// PARMSET_19200 0x02
+// PARMSET_57600 0x04
+// PARMSET_115200 0x06
+//
+// Returns: current DS2480 baud rate.
+//
+int DS2480ChangeBaud(int portnum, uchar newbaud)
+{
+ int rt=FALSE;
+ uchar readbuffer[5],sendpacket[5],sendpacket2[5];
+ int sendlen=0,sendlen2=0;
+
+ // see if diffenent then current baud rate
+ if (UBaud[portnum] == newbaud)
+ return TRUE;
+ else
+ {
+ // build the command packet
+ // check if correct mode
+ if (UMode[portnum] != MODSEL_COMMAND)
+ {
+ UMode[portnum] = MODSEL_COMMAND;
+ sendpacket[sendlen++] = MODE_COMMAND;
+ }
+ // build the command
+ sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_BAUDRATE | newbaud;
+
+ // flush the buffers
+ FlushCOM(portnum);
+
+ // send the packet
+ if (!WriteCOM(portnum,sendlen,sendpacket))
+ rt = FALSE;
+ else
+ {
+ // make sure buffer is flushed
+ msDelay(5);
+
+ // change our baud rate
+ SetBaudCOM(portnum,newbaud);
+ UBaud[portnum] = newbaud;
+
+ // wait for things to settle
+ msDelay(5);
+
+ // build a command packet to read back baud rate
+ sendpacket2[sendlen2++] = CMD_CONFIG | PARMSEL_PARMREAD | (PARMSEL_BAUDRATE >> 3);
+
+ // flush the buffers
+ FlushCOM(portnum);
+
+ // send the packet
+ if (WriteCOM(portnum,sendlen2,sendpacket2))
+ {
+ // read back the 1 byte response
+ if (ReadCOM(portnum,1,readbuffer) == 1)
+ {
+ // verify correct baud
+ if (((readbuffer[0] & 0x0E) == (sendpacket[sendlen-1] & 0x0E)))
+ rt = TRUE;
+ }
+ }
+ }
+ }
+
+ // if lost communication with DS2480 then reset
+ if (rt != TRUE)
+ DS2480Detect(portnum);
+
+ return UBaud[portnum];
+}
projects / fw / sdcc / blobdiff