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330 lines
9.0 KiB
ArmAsm
330 lines
9.0 KiB
ArmAsm
;; The following code is written and is copyrighted by
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;; Groepaz/Hitmen
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;; Small changes by Adam Dunkels (renamed ss232 -> rs232)
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;----------------------------------------------------------------------------------------------
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; silver surfer polling mode driver for cc65
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; - work from here to create a full featured driver with interupts.
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; gpz fixed 20020828: fatal bug fixed in _rs232_params
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;----------------------------------------------------------------------------------------------
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rs16550base = $de08
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fifo_rxd = rs16550base+$00 ;8 (r)
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fifo_txd = rs16550base+$00 ;8 (w)
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fifo_dll = rs16550base+$00 ;8 (r/w)
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fifo_dlm = rs16550base+$01 ;9 (r/w)
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fifo_ier = rs16550base+$01 ;9
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fifo_fcr = rs16550base+$02 ;a (w)
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fifo_iir = rs16550base+$02 ;a (r)
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fifo_lcr = rs16550base+$03 ;b
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fifo_mcr = rs16550base+$04 ;c
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fifo_lsr = rs16550base+$05 ;d
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fifo_msr = rs16550base+$06 ;e (r)
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fifo_scratch = rs16550base+$07 ;f (r/w)
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.export _rs232_init
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.export _rs232_done
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.export _rs232_params
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.export _rs232_put
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.export _rs232_get
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.importzp ptr1, ptr2
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.import popa, popax
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;----------------------------------------------------------------------------------------------
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; Error codes. Beware: The codes must match the codes in the C header file
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ErrNotInitialized = $01
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ErrBaudTooFast = $02
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ErrBaudNotAvail = $03
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ErrNoData = $04
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ErrOverflow = $05
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;----------------------------------------------------------------------------------------------
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;unsigned char __fastcall__ rs232_init (char hacked);
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;/* Initialize the serial port, install the interrupt handler. The parameter
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; * has no effect for now and should be set to 0.
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; */
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;----------------------------------------------------------------------------------------------
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.code
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_rs232_init:
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; enable ssurfer-port
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lda $de01
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ora #$01
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sta $de01
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; disable nmi's from ssurfer
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lda #%00000000
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sta fifo_ier
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; activate dtr
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lda #%00000001
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sta fifo_mcr
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lda #$00 ; ok
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tax
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rts
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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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_rs232_done:
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; disable nmi's from ssurfer
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lda #%00000000
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sta fifo_ier
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; deactivate dtr
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sta fifo_mcr
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; disable ssurfer-port
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lda $de01
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and #$fe
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sta $de01
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lda #$00 ; ok
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tax
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rts
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;----------------------------------------------------------------------------------------------
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;unsigned char __fastcall__ rs232_params (unsigned char params, unsigned char parity);
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;/* Set the port parameters. Use a combination of the #defined values above. */
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;----------------------------------------------------------------------------------------------
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.data
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_rs232_baudrates:
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.word (7372800 / ( 50 * 16))
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.word (7372800 / ( 110 * 16))
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.word (7372800 / ( 269 * 8))
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.word (7372800 / ( 300 * 16))
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.word (7372800 / ( 600 * 16))
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.word (7372800 / ( 1200 * 16))
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.word (7372800 / ( 2400 * 16))
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.word (7372800 / ( 4800 * 16))
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.word (7372800 / ( 9600 * 16))
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.word (7372800 / ( 19200 * 16))
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.word (7372800 / ( 38400 * 16))
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.word (7372800 / ( 57600 * 16))
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.word (7372800 / ( 115200 * 16))
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.word (7372800 / ( 230400 * 16))
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.bss
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_rs232_tmp1:
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.res 1
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.code
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_rs232_params:
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sta _rs232_tmp1 ; save parity
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; reset fifo
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lda #%10000111
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sta fifo_fcr
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; that delay thing really needed ?!
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; (original datasheet mentions a delay here)
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; ldy #$00
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; dey
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; bny *-1
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; set dlab
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lda #%10000011 ; we assmume 8n1
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sta fifo_lcr
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jsr popa
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tay ; save param
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; set baudrate
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clc
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lsr a
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lsr a
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lsr a
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lsr a
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asl a
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tax
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lda _rs232_baudrates,x
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sta fifo_dll
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lda _rs232_baudrates+1,x
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sta fifo_dlm
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tya ; param
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and #$0f
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ora _rs232_tmp1 ; parity
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; reset dlab
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sta fifo_lcr
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lda #$00 ; ok
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tax
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rts
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;----------------------------------------------------------------------------------------------
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; check if byte available, returns AKKU=0 if none
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ss_getlsr:
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lda fifo_lsr
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and #$01
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rts
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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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; get byte (non blocking, returns byte in A or CARRY=1 - error)
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_rs232_get:
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sta ptr1
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stx ptr1+1
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jsr ss_getlsr ; check if byte available
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; bne sk32 ; yes
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bne sk33 ; yes
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; activate rts
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lda #%00000011
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sta fifo_mcr
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sk32:
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; deactivate rts
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; lda #%00000001
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; sta fifo_mcr
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jsr ss_getlsr ; check if byte available
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bne sk33 ; yes
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; deactivate rts
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lda #%00000001
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sta fifo_mcr
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lda #ErrNoData ; no data
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ldx #0
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rts
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sk33:
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; deactivate rts
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lda #%00000001
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sta fifo_mcr
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; get byte
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ldy #$00
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lda fifo_rxd
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sta (ptr1),y
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lda #0 ; ok
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tax
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rts
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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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_rs232_put:
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tax
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; transmit buf ready?
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lda fifo_lsr
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and #%00100000
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bne @sk1
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@sk2:
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lda #ErrOverflow ; overflow
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ldx #$00
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rts
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@sk1:
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; reciever ready?
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lda fifo_msr
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and #%00010000
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beq @sk2
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stx fifo_txd
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lda #$00 ; ok
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tax
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rts
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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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; activate rts
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lda #%00000011
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sta fifo_mcr
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lda #$00 ; ok
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tax
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rts
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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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; deactivate rts
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lda #%00000001
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sta fifo_mcr
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lda #$00 ; ok
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tax
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rts
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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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sta ptr2
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stx ptr2+1
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jsr popax
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sta ptr1
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stx ptr1+1
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ldy #$00
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; Get status
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lda fifo_iir
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and #%00000001
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sta _rs232_tmp1
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lda fifo_msr
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lsr a
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and #%01010000
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ora _rs232_tmp1
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sta _rs232_tmp1
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lda fifo_lsr
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and #%00101110
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ora _rs232_tmp1
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sta (ptr1),y
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; Get errors
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lda #$00 ; ok
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sta (ptr2),y
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lda #$00 ; ok
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tax
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rts
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