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https://github.com/cc65/cc65.git
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395 lines
7.4 KiB
ArmAsm
395 lines
7.4 KiB
ArmAsm
;
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; Christian Groessler, Dec-2001
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;
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; RS232 routines using the R: device (currently tested with an 850 only)
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;
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; unsigned char __fastcall__ rs232_init (char hacked);
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; unsigned char __fastcall__ rs232_params (unsigned char params, unsigned char parity);
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; unsigned char __fastcall__ rs232_done (void);
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; unsigned char __fastcall__ rs232_get (char* B);
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; unsigned char __fastcall__ rs232_put (char B);
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; unsigned char __fastcall__ rs232_pause (void); [TODO]
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; unsigned char __fastcall__ rs232_unpause (void); [TODO]
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; unsigned char __fastcall__ rs232_status (unsigned char* status,
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; unsigned char* errors); [TODO]
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;
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.import findfreeiocb
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.import __seterrno, __do_oserror, __oserror
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.import fddecusage
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.import fdtoiocb
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.import __inviocb
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.import clriocb
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.import newfd
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.import _close, pushax, popax, popa
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.importzp ptr1, tmp2, tmp3
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.export _rs232_init, _rs232_params, _rs232_done, _rs232_get
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.export _rs232_put, _rs232_pause, _rs232_unpause, _rs232_status
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.include "atari.inc"
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.include "errno.inc"
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.include "rs232.inc"
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.rodata
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rdev: .byte "R:", ATEOL, 0
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.bss
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; receive buffer
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RECVBUF_SZ = 256
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recv_buf: .res RECVBUF_SZ
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cm_run: .res 1 ; concurrent mode running?
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.data
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rshand: .word $ffff
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.code
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_init (char hacked);
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; /* Initialize the serial port. The parameter is ignored in the Atari version.
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; * return 0/-1 for OK/Error
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; */
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;
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.proc _rs232_init
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jsr findfreeiocb
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beq iocbok ; we found one
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lda #<EMFILE ; "too many open files"
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ldx #>EMFILE
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seterr: jsr __seterrno
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lda #$FF
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tax
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rts ; return -1
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iocbok: txa
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tay ; move iocb # into Y
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lda #3
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sta tmp3 ; name length + 1
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lda #<rdev
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ldx #>rdev
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jsr newfd
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tya
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bcs doopen ; C set: open needed / device not already open
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pha
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jsr _rs232_done ;** shut down if started @@@TODO check this out!!
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pla
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doopen: tax
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pha
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jsr clriocb
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pla
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tax
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lda #<rdev
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sta ICBAL,x
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lda #>rdev
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sta ICBAH,x
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lda #OPEN
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sta ICCOM,x
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lda #$0D ; mode in+out+concurrent
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sta ICAX1,x
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lda #0
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sta ICAX2,x
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sta ICBLL,x ; zap buf len
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sta ICBLH,x
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jsr CIOV
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bmi cioerr
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lda tmp2 ; get fd
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sta rshand
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ldx #0
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stx rshand+1
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txa
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stx __oserror
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rts
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cioerr: jsr fddecusage ; decrement usage counter of fd as open failed
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jmp __do_oserror
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.endproc ; _rs232_init
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_params (unsigned char params, unsigned char parity);
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;
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; Set communication parameters.
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;
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; params contains baud rate, stop bits and word size
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; parity contains parity
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;
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; 850 manual documents restrictions on the baud rate (not > 300), when not
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; using 8 bit word size. So only 8 bit is currently tested.
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;
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.proc _rs232_params
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sta tmp2
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lda rshand
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cmp #$ff
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bne work ; work only if initialized
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lda #RS_ERR_NOT_INITIALIZED
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bne done
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work: lda rshand
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ldx #0
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jsr fdtoiocb ; get iocb index into X
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bmi inverr ; shouldn't happen
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tax
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; set handshake lines
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lda #34 ; xio 34, set cts, dtr etc
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sta ICCOM,x
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lda #192+48+3 ; DTR on, RTS on, XMT on
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sta ICAX1,x
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lda #0
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sta ICBLL,x
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sta ICBLH,x
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sta ICBAL,x
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sta ICBAH,x
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sta ICAX2,x
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jsr CIOV
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bmi cioerr
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; set baud rate, word size, stop bits and ready monitoring
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lda #36 ; xio 36, baud rate
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sta ICCOM,x
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jsr popa ; get parameter
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sta ICAX1,x
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;ICAX2 = 0, monitor nothing
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jsr CIOV
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bmi cioerr
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; set translation and parity
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lda #38 ; xio 38, translation and parity
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sta ICCOM,x
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lda tmp2
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ora #32 ; no translation
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sta ICAX1,x
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jsr CIOV
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bmi cioerr
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lda #0
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done: ldx #0
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rts
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inverr: jmp __inviocb
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.endproc ;_rs232_params
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cioerr: jmp __do_oserror
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_done (void);
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; /* Close the port, deinstall the interrupt hander. You MUST call this function
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; * before terminating the program, otherwise the machine may crash later. If
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; * in doubt, install an exit handler using atexit(). The function will do
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; * nothing, if it was already called.
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; */
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;
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.proc _rs232_done
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lda rshand
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cmp #$ff
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beq done
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work: ldx rshand+1
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jsr pushax
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jsr _close
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pha
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txa
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pha
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ldx #$ff
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stx rshand
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stx rshand+1
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inx
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stx cm_run
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pla
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tax
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pla
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done: rts
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.endproc ;rs232_done
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_get (char* B);
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; /* Get a character from the serial port. If no characters are available, the
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; * function will return RS_ERR_NO_DATA, so this is not a fatal error.
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; */
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;
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.proc _rs232_get
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ldy rshand
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cpy #$ff
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bne work ; work only if initialized
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lda #RS_ERR_NOT_INITIALIZED
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bne nierr
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work: sta ptr1
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stx ptr1+1 ; store pointer to received char
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lda rshand
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ldx #0
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jsr fdtoiocb
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tax
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lda cm_run ; concurrent mode already running?
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bne go
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jsr ena_cm ; turn on concurrent mode
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go: ; check whether there is any input available
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lda #STATIS ; status request, returns bytes pending
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sta ICCOM,x
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jsr CIOV
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bmi cioerr ; @@@ error handling
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lda DVSTAT+1 ; get byte count pending
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ora DVSTAT+2
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beq nix_da ; no input waiting...
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; input is available: get it!
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lda #GETCHR ; get raw bytes
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sta ICCOM,x ; in command code
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lda #0
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sta ICBLL,x
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sta ICBLH,x
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sta ICBAL,x
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sta ICBAH,x
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jsr CIOV ; go get it
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bmi cioerr ; @@@ error handling
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ldx #0
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sta (ptr1,x) ; return received byte
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txa
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rts
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nierr: ldx #0
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rts
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nix_da: lda #RS_ERR_NO_DATA
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ldx #0
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rts
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.endproc ;_rs232_get
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_put (char B);
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; /* Send a character via the serial port. There is a transmit buffer, but
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; * transmitting is not done via interrupt. The function returns
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; * RS_ERR_OVERFLOW if there is no space left in the transmit buffer.
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; */
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;
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.proc _rs232_put
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ldy rshand
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cpy #$ff
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bne work ; work only if initialized
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lda #RS_ERR_NOT_INITIALIZED
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bne nierr
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work: pha
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lda rshand
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ldx #0
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jsr fdtoiocb
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tax
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lda cm_run ; concurrent mode already running?
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bne go
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jsr ena_cm ; turn on concurrent mode
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; @@@TODO: check output buffer overflow
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go: lda #PUTCHR ; put raw bytes
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sta ICCOM,x ; in command code
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lda #0
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sta ICBLL,x
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sta ICBLH,x
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sta ICBAL,x
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sta ICBAH,x
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pla ; get the char back
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jsr CIOV ; go do it
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rts
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nierr: ldx #0
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rts
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.endproc ;_rs232_put
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_pause (void);
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; /* Assert flow control and disable interrupts. */
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;
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_rs232_pause:
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_unpause (void);
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; /* Re-enable interrupts and release flow control */
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;
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_rs232_unpause:
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;----------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ rs232_status (unsigned char* status,
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; unsigned char* errors);
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; /* Return the serial port status. */
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;
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_rs232_status:
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lda #255
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tax
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rts
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; enable concurrent rs232 mode
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; gets iocb index in X
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; all registers destroyed
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.proc ena_cm
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lda #40 ; XIO 40, start concurrent IO
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sta ICCOM,x
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sta cm_run ; indicate concurrent mode is running
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lda #0
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sta ICAX1,x
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sta ICAX2,x
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lda #<recv_buf
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sta ICBAL,x
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lda #>recv_buf
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sta ICBAH,x
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lda #<RECVBUF_SZ
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sta ICBLL,x
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lda #>RECVBUF_SZ
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sta ICBLH,x
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lda #$0D ; value from 850 man, p62. must be 0D?,
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sta ICAX1,x ; or any non-zero?
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jmp CIOV
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.endproc ;ena_cm
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.end
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