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robfinch |
; ============================================================================
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; __
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; \\__/ o\ (C) 2022 Robert Finch, Waterloo
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; \ __ / All rights reserved.
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; \/_// robfinch@opencores.org
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; ||
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;
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;
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; BSD 3-Clause License
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions are met:
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;
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; 1. Redistributions of source code must retain the above copyright notice, this
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; list of conditions and the following disclaimer.
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;
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; 2. Redistributions in binary form must reproduce the above copyright notice,
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; this list of conditions and the following disclaimer in the documentation
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; and/or other materials provided with the distribution.
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;
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; 3. Neither the name of the copyright holder nor the names of its
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; contributors may be used to endorse or promote products derived from
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; this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;
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; ============================================================================
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;
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; S19 variables
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;
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s19Address EQU $940 ; to $943
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s19StartAddress EQU $944 ; to $947
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s19Rectype EQU $948
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s19Reclen EQU $949
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s19Abort EQU $94A
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s19Checksum EQU $94B
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s19SummaryChecksum EQU $94C
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s19Source EQU $94E
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s19XferAddress EQU $950 ; to $951
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; ------------------------------------------------------------------------------
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; Input a character either from a file in memory or from the serial port.
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;
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; Parameters:
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; none
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; Returns:
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; accb = character input
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; ------------------------------------------------------------------------------
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s19InputChar:
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tst s19Source
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beq s19ic1
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ldb [s19XferAddress]
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inc s19XferAddress+1 ; increment low byte of address pointer
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bne s19ic2
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inc s19XferAddress ; increment high byte of address pointer
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s19ic2:
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rts
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s19ic1:
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ldd #-1 ; block until input is available
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swi
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fcb MF_INCH ; monitor input rout
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rts
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; ------------------------------------------------------------------------------
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; Skip over input to the next record.
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; ------------------------------------------------------------------------------
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s19NextRecord:
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bsr s19InputChar
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cmpb #LF ; line feed marks end of record
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beq s19nr1
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cmpb #CTRLC ; should not get this in a file transfer
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bne s19nr2
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stb s19Abort
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s19nr2:
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cmpb #CTRLZ ; end of file marker?
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bne s19nr3
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stb s19Abort
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s19nr3:
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tst s19Abort
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beq s19NextRecord
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s19nr1:
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rts
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; ------------------------------------------------------------------------------
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; Update the checksum.
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; ------------------------------------------------------------------------------
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s19AddCheck:
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pshs b
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addb s19Checksum
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stb s19Checksum
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puls b,pc
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; ------------------------------------------------------------------------------
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; Input a byte. There are three characters per byte since things are 12-bit.
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;
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; Parameters:
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; none
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; Returns:
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; accb = byte value converted from text
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; ------------------------------------------------------------------------------
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s19GetByte:
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bsr s19InputChar ; get the first character
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lbsr AsciiToHexNybble ; convert to nybble
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tst s19Abort ; check for abort
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beq s19gb1
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clra
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rts
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s19gb1: ; shift the value four bits
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aslb
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aslb
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aslb
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aslb
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pshs b ; save off value
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bsr s19InputChar ; get the second character
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lbsr AsciiToHexNybble ; convert to nybble
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tst s19Abort ; check for abort
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bne s19gb2
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orb ,s+ ; merge new nybble into value
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aslb ; shift the value four more bits
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aslb
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aslb
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aslb
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pshs b ; save off value
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bsr s19InputChar ; get the third character
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lbsr AsciiToHexNybble ; convert to nybble
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orb ,s+ ; merge in value
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clra ; make byte 000 to FFF in D
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rts
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s19gb2:
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leas 1,s ; discard saved byte
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clra
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rts
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; ------------------------------------------------------------------------------
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; Zero out address
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; ------------------------------------------------------------------------------
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s19ClearAddress:
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clr s19Address
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clr s19Address+1
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clr s19Address+2
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clr s19Address+3
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rts
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; ------------------------------------------------------------------------------
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; Get an address composed of two bytes (24 bit)
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;
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; Side Effects:
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; updates s19Address variable
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; Returns:
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; none
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; ------------------------------------------------------------------------------
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s19GetAddress2:
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bsr s19ClearAddress
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bsr s19GetByte
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bsr s19AddCheck
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stb s19Address+2
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tst s19Abort
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bne s19ga1
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bsr s19GetByte
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bsr s19AddCheck
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stb s19Address+3
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s19ga1:
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rts
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; ------------------------------------------------------------------------------
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; Get an address composed of three bytes (36 bit)
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;
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; Side Effects:
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; updates s19Address variable
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; Returns:
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; none
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; ------------------------------------------------------------------------------
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s19GetAddress3:
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bsr s19ClearAddress
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bsr s19GetByte
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bsr s19AddCheck
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stb s19Address+1
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tst s19Abort
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bne s19ga2
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bsr s19GetByte
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bsr s19AddCheck
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stb s19Address+2
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tst s19Abort
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bne s19ga2
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bsr s19GetByte
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bsr s19AddCheck
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stb s19Address+3
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s19ga2:
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rts
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; ------------------------------------------------------------------------------
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; Put a byte to memory.
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; ------------------------------------------------------------------------------
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s19PutMem:
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clrb ; accb = current byte count
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s19pm3:
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pshs b ; save byte count
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bsr s19GetByte
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bsr s19AddCheck
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tst s19Abort
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bne s19pm1
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stb far [s19Address+1] ; store the byte using far addressing
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inc s19Address+3
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bne s19pm2
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inc s19Address+2
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bne s19pm2
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inc s19Address+1
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s19pm2:
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puls b ; get back byte count
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incb ; increment and
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cmpb s19Reclen ; compare to record length
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blo s19pm3
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bsr s19GetByte ; get the checksum byte
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bra s19AddCheck
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s19pm1:
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leas 1,s ; faster than actual pull
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bsr s19GetByte ; get the checksum byte
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bra s19AddCheck
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; ------------------------------------------------------------------------------
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; Processing for S1 record type.
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; ------------------------------------------------------------------------------
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s19ProcessS1:
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bsr s19GetAddress2
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bsr s19PutMem
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tst s19Checksum
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beq s19p11
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inc s19SummaryChecksum
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ldd #msgChecksumErr
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swi
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fcb MF_DisplayString
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s19p11:
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bra s19lnr
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; ------------------------------------------------------------------------------
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; Processing for S2 record type.
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; ------------------------------------------------------------------------------
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s19ProcessS2:
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bsr s19GetAddress3
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bsr s19PutMem
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tst s19Checksum
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beq s19p21
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inc s19SummaryChecksum
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ldd #msgChecksumErr
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swi
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fcb MF_DisplayString
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s19p21:
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bra s19lnr
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; S3,4,5,6 not processed
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; ------------------------------------------------------------------------------
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; Processing for S7 record type. Gets a two byte (24 bit) start address.
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; ------------------------------------------------------------------------------
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s19ProcessS9:
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| 275 |
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bsr s19GetAddress2
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ldd s19Address+2
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std s19StartAddress+2
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ldd s19Address+0
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| 279 |
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std s19StartAddress+0
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| 280 |
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bra s19l2
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| 281 |
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| 282 |
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; ------------------------------------------------------------------------------
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| 283 |
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; Processing for S8 record type. Gets a three byte (36 bit) start address.
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| 284 |
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; ------------------------------------------------------------------------------
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| 285 |
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| 286 |
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s19ProcessS8:
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| 287 |
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bsr s19GetAddress3
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| 288 |
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ldd s19Address+2
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| 289 |
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std s19StartAddress+2
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| 290 |
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ldd s19Address+0
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| 291 |
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std s19StartAddress+0
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| 292 |
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bra s19l2
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| 293 |
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| 294 |
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; ------------------------------------------------------------------------------
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| 295 |
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; S19 Loader
|
| 296 |
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;
|
| 297 |
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; Not all record types are processed. Some are skipped over.
|
| 298 |
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; ------------------------------------------------------------------------------
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| 299 |
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| 300 |
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S19Loader:
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| 301 |
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clr s19Source
|
| 302 |
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lbsr GetNumber ; check for a file storage address
|
| 303 |
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tstb
|
| 304 |
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beq s19l4 ; if not a memory file
|
| 305 |
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inc s19Source ; set flag indicating a memory file
|
| 306 |
|
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ldd mon_numwka+2 ; set transfer address variable
|
| 307 |
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std s19XferAddress
|
| 308 |
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s19l4:
|
| 309 |
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clr s19Abort ; clear the abort flag
|
| 310 |
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ldd #msgS19Loader ; signon banner
|
| 311 |
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swi
|
| 312 |
|
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fcb MF_DisplayString
|
| 313 |
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clr s19SummaryChecksum
|
| 314 |
|
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s19l3:
|
| 315 |
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bsr s19InputChar ; get a character from input
|
| 316 |
|
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cmpb #CTRLZ ; is it CTRL-Z?
|
| 317 |
|
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beq s19l2
|
| 318 |
|
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clr s19Checksum
|
| 319 |
|
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cmpb #'C' ; records must start with the letter C
|
| 320 |
|
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bne s19lnr
|
| 321 |
|
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bsr s19InputChar ; get the next character
|
| 322 |
|
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cmpb #'0' ; must be a numeric digit
|
| 323 |
|
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blo s19lnr
|
| 324 |
|
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cmpb #'9'
|
| 325 |
|
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bhi s19lnr
|
| 326 |
|
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stb s19Rectype ; save off in record type
|
| 327 |
|
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bsr s19GetByte ; get a byte indicating record length
|
| 328 |
|
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bsr s19AddCheck
|
| 329 |
|
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stb s19Reclen
|
| 330 |
|
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tst s19Abort ; check for abort
|
| 331 |
|
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bne s19l2
|
| 332 |
|
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ldb s19Rectype ; process according to record type
|
| 333 |
|
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cmpb #'0'
|
| 334 |
|
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beq s19lnr
|
| 335 |
|
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cmpb #'1'
|
| 336 |
|
|
beq s19ProcessS1 ; data record with a two byte address
|
| 337 |
|
|
cmpb #'2'
|
| 338 |
|
|
beq s19ProcessS2 ; data record with a three byte address
|
| 339 |
|
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cmpb #'3'
|
| 340 |
|
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beq s19lnr
|
| 341 |
|
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cmpb #'5' ; record count? ignore
|
| 342 |
|
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beq s19lnr
|
| 343 |
|
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cmpb #'7' ; ignore record with 48 bit address
|
| 344 |
|
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beq s19l2
|
| 345 |
|
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cmpb #'8'
|
| 346 |
|
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beq s19ProcessS8 ; two byte start address
|
| 347 |
|
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cmpb #'9'
|
| 348 |
|
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beq s19ProcessS9 ; three byte start address
|
| 349 |
|
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s19lnr:
|
| 350 |
|
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ldb #'.' ; output a progress indicator
|
| 351 |
|
|
swi
|
| 352 |
|
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fcb MF_OUTCH
|
| 353 |
|
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bsr s19NextRecord ; skip to the next record
|
| 354 |
|
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tst S19Abort ; check for abort
|
| 355 |
|
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bne s19l2
|
| 356 |
|
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bra s19l3 ; loop back to process more records
|
| 357 |
|
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s19l2:
|
| 358 |
|
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lbra Monitor
|
| 359 |
|
|
|
| 360 |
|
|
msgS19Loader:
|
| 361 |
|
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fcb "S19 Loader Active",CR,LF,0
|
| 362 |
|
|
msgChecksumErr:
|
| 363 |
|
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fcb "S19 Checksum Err",CR,LF,0
|
| 364 |
|
|
|
| 365 |
|
|
|
