mirror of
https://github.com/cc65/cc65.git
synced 2024-06-30 16:29:58 +00:00
390 lines
9.8 KiB
Plaintext
390 lines
9.8 KiB
Plaintext
;
|
|
; Christian Groessler, Dec-2001
|
|
;
|
|
; RS232 routines using the R: device (currently tested with an 850 only)
|
|
;
|
|
; unsigned char __fastcall__ rs232_init (char hacked);
|
|
; unsigned char __fastcall__ rs232_params (unsigned char params, unsigned char parity);
|
|
; unsigned char __fastcall__ rs232_done (void);
|
|
; unsigned char __fastcall__ rs232_get (char* B);
|
|
; unsigned char __fastcall__ rs232_put (char B);
|
|
; unsigned char __fastcall__ rs232_pause (void); [TODO]
|
|
; unsigned char __fastcall__ rs232_unpause (void); [TODO]
|
|
; unsigned char __fastcall__ rs232_status (unsigned char* status,
|
|
; unsigned char* errors); [TODO]
|
|
;
|
|
|
|
.import findfreeiocb
|
|
.import __do_oserror
|
|
.import fddecusage
|
|
.import fdtoiocb
|
|
.import __inviocb
|
|
.import clriocb
|
|
.import newfd
|
|
.import _close, pushax, popax, popa
|
|
.importzp ptr1, tmp2, tmp3
|
|
|
|
.export _rs232_init, _rs232_params, _rs232_done, _rs232_get
|
|
.export _rs232_put, _rs232_pause, _rs232_unpause, _rs232_status
|
|
|
|
.include "atari.inc"
|
|
.include "errno.inc"
|
|
.include "rs232.inc"
|
|
|
|
.rodata
|
|
|
|
rdev: .byte "R:", ATEOL, 0
|
|
|
|
.bss
|
|
|
|
; receive buffer
|
|
RECVBUF_SZ = 256
|
|
recv_buf: .res RECVBUF_SZ
|
|
|
|
cm_run: .res 1 ; concurrent mode running?
|
|
|
|
.data
|
|
|
|
rshand: .word $ffff
|
|
|
|
.code
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_init (char hacked);
|
|
; /* Initialize the serial port. The parameter is ignored in the Atari version.
|
|
; * return 0/-1 for OK/Error
|
|
; */
|
|
;
|
|
|
|
.proc _rs232_init
|
|
|
|
jsr findfreeiocb
|
|
bne init_err
|
|
txa
|
|
tay ; move iocb # into Y
|
|
lda #3
|
|
sta tmp3 ; name length + 1
|
|
lda #<rdev
|
|
ldx #>rdev
|
|
jsr newfd
|
|
tya
|
|
bcs doopen ; C set: open needed / device not already open
|
|
|
|
pha
|
|
jsr _rs232_done ;** shut down if started @@@TODO check this out!!
|
|
pla
|
|
|
|
doopen: tax
|
|
pha
|
|
jsr clriocb
|
|
pla
|
|
tax
|
|
lda #<rdev
|
|
sta ICBAL,x
|
|
lda #>rdev
|
|
sta ICBAH,x
|
|
lda #OPEN
|
|
sta ICCOM,x
|
|
|
|
lda #$0D ; mode in+out+concurrent
|
|
sta ICAX1,x
|
|
lda #0
|
|
sta ICAX2,x
|
|
sta ICBLL,x ; zap buf len
|
|
sta ICBLH,x
|
|
jsr CIOV
|
|
bmi cioerr1
|
|
|
|
lda tmp2 ; get fd
|
|
sta rshand
|
|
ldx #0
|
|
stx rshand+1
|
|
txa
|
|
rts
|
|
|
|
cioerr1:jsr fddecusage ; decrement usage counter of fd as open failed
|
|
|
|
init_err:
|
|
ldx #0
|
|
lda #RS_ERR_INIT_FAILED
|
|
rts
|
|
|
|
.endproc ; _rs232_init
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_params (unsigned char params, unsigned char parity);
|
|
;
|
|
; Set communication parameters.
|
|
;
|
|
; params contains baud rate, stop bits and word size
|
|
; parity contains parity
|
|
;
|
|
; 850 manual documents restrictions on the baud rate (not > 300), when not
|
|
; using 8 bit word size. So only 8 bit is currently tested.
|
|
;
|
|
|
|
.proc _rs232_params
|
|
|
|
sta tmp2
|
|
lda rshand
|
|
cmp #$ff
|
|
bne work ; work only if initialized
|
|
lda #RS_ERR_NOT_INITIALIZED
|
|
bne done
|
|
work: lda rshand
|
|
ldx #0
|
|
jsr fdtoiocb ; get iocb index into X
|
|
bmi inverr ; shouldn't happen
|
|
tax
|
|
|
|
; set handshake lines
|
|
|
|
lda #34 ; xio 34, set cts, dtr etc
|
|
sta ICCOM,x
|
|
lda #192+48+3 ; DTR on, RTS on, XMT on
|
|
sta ICAX1,x
|
|
lda #0
|
|
sta ICBLL,x
|
|
sta ICBLH,x
|
|
sta ICBAL,x
|
|
sta ICBAH,x
|
|
sta ICAX2,x
|
|
jsr CIOV
|
|
bmi cioerr
|
|
|
|
; set baud rate, word size, stop bits and ready monitoring
|
|
|
|
lda #36 ; xio 36, baud rate
|
|
sta ICCOM,x
|
|
jsr popa ; get parameter
|
|
sta ICAX1,x
|
|
;ICAX2 = 0, monitor nothing
|
|
jsr CIOV
|
|
bmi cioerr
|
|
|
|
; set translation and parity
|
|
|
|
lda #38 ; xio 38, translation and parity
|
|
sta ICCOM,x
|
|
lda tmp2
|
|
ora #32 ; no translation
|
|
sta ICAX1,x
|
|
jsr CIOV
|
|
bmi cioerr
|
|
|
|
lda #0
|
|
done: ldx #0
|
|
rts
|
|
|
|
inverr: jmp __inviocb
|
|
|
|
.endproc ;_rs232_params
|
|
|
|
cioerr: jmp __do_oserror
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_done (void);
|
|
; /* Close the port, deinstall the interrupt hander. You MUST call this function
|
|
; * before terminating the program, otherwise the machine may crash later. If
|
|
; * in doubt, install an exit handler using atexit(). The function will do
|
|
; * nothing, if it was already called.
|
|
; */
|
|
;
|
|
|
|
.proc _rs232_done
|
|
|
|
lda rshand
|
|
cmp #$ff
|
|
beq done
|
|
work: ldx rshand+1
|
|
jsr pushax
|
|
jsr _close
|
|
pha
|
|
txa
|
|
pha
|
|
ldx #$ff
|
|
stx rshand
|
|
stx rshand+1
|
|
inx
|
|
stx cm_run
|
|
pla
|
|
tax
|
|
pla
|
|
done: rts
|
|
|
|
.endproc ;rs232_done
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_get (char* B);
|
|
; /* Get a character from the serial port. If no characters are available, the
|
|
; * function will return RS_ERR_NO_DATA, so this is not a fatal error.
|
|
; */
|
|
;
|
|
|
|
.proc _rs232_get
|
|
|
|
ldy rshand
|
|
cpy #$ff
|
|
bne work ; work only if initialized
|
|
lda #RS_ERR_NOT_INITIALIZED
|
|
bne nierr
|
|
|
|
work: sta ptr1
|
|
stx ptr1+1 ; store pointer to received char
|
|
|
|
lda rshand
|
|
ldx #0
|
|
jsr fdtoiocb
|
|
tax
|
|
lda cm_run ; concurrent mode already running?
|
|
bne go
|
|
jsr ena_cm ; turn on concurrent mode
|
|
|
|
go: ; check whether there is any input available
|
|
|
|
lda #STATIS ; status request, returns bytes pending
|
|
sta ICCOM,x
|
|
jsr CIOV
|
|
bmi cioerr ; @@@ error handling
|
|
|
|
lda DVSTAT+1 ; get byte count pending
|
|
ora DVSTAT+2
|
|
beq nix_da ; no input waiting...
|
|
|
|
; input is available: get it!
|
|
|
|
lda #GETCHR ; get raw bytes
|
|
sta ICCOM,x ; in command code
|
|
lda #0
|
|
sta ICBLL,x
|
|
sta ICBLH,x
|
|
sta ICBAL,x
|
|
sta ICBAH,x
|
|
jsr CIOV ; go get it
|
|
bmi cioerr ; @@@ error handling
|
|
|
|
ldx #0
|
|
sta (ptr1,x) ; return received byte
|
|
txa
|
|
rts
|
|
|
|
nierr: ldx #0
|
|
rts
|
|
|
|
nix_da: lda #RS_ERR_NO_DATA
|
|
ldx #0
|
|
rts
|
|
|
|
.endproc ;_rs232_get
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_put (char B);
|
|
; /* Send a character via the serial port. There is a transmit buffer, but
|
|
; * transmitting is not done via interrupt. The function returns
|
|
; * RS_ERR_OVERFLOW if there is no space left in the transmit buffer.
|
|
; */
|
|
;
|
|
|
|
.proc _rs232_put
|
|
|
|
ldy rshand
|
|
cpy #$ff
|
|
bne work ; work only if initialized
|
|
lda #RS_ERR_NOT_INITIALIZED
|
|
bne nierr
|
|
|
|
work: pha
|
|
lda rshand
|
|
ldx #0
|
|
jsr fdtoiocb
|
|
tax
|
|
lda cm_run ; concurrent mode already running?
|
|
bne go
|
|
jsr ena_cm ; turn on concurrent mode
|
|
|
|
; @@@TODO: check output buffer overflow
|
|
go: lda #PUTCHR ; put raw bytes
|
|
sta ICCOM,x ; in command code
|
|
lda #0
|
|
sta ICBLL,x
|
|
sta ICBLH,x
|
|
sta ICBAL,x
|
|
sta ICBAH,x
|
|
pla ; get the char back
|
|
jsr CIOV ; go do it
|
|
rts
|
|
|
|
nierr: ldx #0
|
|
rts
|
|
|
|
.endproc ;_rs232_put
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_pause (void);
|
|
; /* Assert flow control and disable interrupts. */
|
|
;
|
|
|
|
_rs232_pause:
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_unpause (void);
|
|
; /* Re-enable interrupts and release flow control */
|
|
;
|
|
|
|
_rs232_unpause:
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
;
|
|
; unsigned char __fastcall__ rs232_status (unsigned char* status,
|
|
; unsigned char* errors);
|
|
; /* Return the serial port status. */
|
|
;
|
|
|
|
_rs232_status:
|
|
|
|
lda #255
|
|
tax
|
|
rts
|
|
|
|
|
|
; enable concurrent rs232 mode
|
|
; gets iocb index in X
|
|
; all registers destroyed
|
|
|
|
.proc ena_cm
|
|
|
|
lda #40 ; XIO 40, start concurrent IO
|
|
sta ICCOM,x
|
|
sta cm_run ; indicate concurrent mode is running
|
|
lda #0
|
|
sta ICAX1,x
|
|
sta ICAX2,x
|
|
lda #<recv_buf
|
|
sta ICBAL,x
|
|
lda #>recv_buf
|
|
sta ICBAH,x
|
|
lda #<RECVBUF_SZ
|
|
sta ICBLL,x
|
|
lda #>RECVBUF_SZ
|
|
sta ICBLH,x
|
|
lda #$0D ; value from 850 man, p62. must be 0D?,
|
|
sta ICAX1,x ; or any non-zero?
|
|
jmp CIOV
|
|
|
|
.endproc ;ena_cm
|
|
|
|
.end
|