mirror of
https://github.com/cc65/cc65.git
synced 2025-01-03 01:31:55 +00:00
Working on the serial driver
git-svn-id: svn://svn.cc65.org/cc65/trunk@2329 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
ff31c93891
commit
5efa39491a
@ -1,4 +1,5 @@
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*.emd
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*.joy
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*.lib
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*.ser
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*.tgi
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@ -129,6 +129,7 @@ c64lib:
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mv c64/crt0.o c64.o
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cp c64/*.emd .
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cp c64/*.joy .
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cp c64/*.ser .
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cp c64/c64-320-200-2.tgi c64-hi.tgi
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#-----------------------------------------------------------------------------
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@ -21,6 +21,9 @@
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%.joy: %.o ../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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%.ser: %.o ../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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%.tgi: %.o ../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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@ -55,6 +58,8 @@ EMDS = c64-georam.emd c64-ram.emd c64-ramcart.emd c64-reu.emd c64-vdc.emd
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JOYS = c64-stdjoy.joy
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SERS = c64-swlink.ser
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TGIS = c64-320-200-2.tgi
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#--------------------------------------------------------------------------
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@ -62,14 +67,14 @@ TGIS = c64-320-200-2.tgi
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.PHONY: all clean zap
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all: $(OBJS) $(EMDS) $(JOYS) $(TGIS)
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all: $(OBJS) $(EMDS) $(JOYS) $(SERS) $(TGIS)
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../runtime/zeropage.o:
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$(MAKE) -C $(dir $@) $(notdir $@)
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clean:
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@rm -f $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(TGIS:.tgi=.o)
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@rm -f $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(SERS:.ser=.o) $(TGIS:.tgi=.o)
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zap: clean
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@rm -f $(EMDS) $(JOYS) $(TGIS)
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@rm -f $(EMDS) $(JOYS) $(SERS) $(TGIS)
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@ -65,10 +65,8 @@ ACIA_CLOCK = ACIA+7 ; Turbo232 external baud-rate generator
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;
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.bss
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DropCnt: .res 4 ; Number of bytes lost from rx buffer full
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Stopped: .res 1 ; Flow-stopped flag
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RtsOff: .res 1 ;
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Errors: .res 1 ; Number of bytes received in error, low byte
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RecvHead: .res 1 ; Head of receive buffer
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RecvTail: .res 1 ; Tail of receive buffer
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RecvFreeCnt: .res 1 ; Number of bytes in receive buffer
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@ -95,15 +93,15 @@ BaudTable: ; bit7 = 1 means setting is invalid
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.byte $FF ; SER_BAUD_75
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.byte $FF ; SER_BAUD_110
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.byte $FF ; SER_BAUD_134_5
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.byte $FF ; SER_BAUD_150
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.byte $02 ; SER_BAUD_150
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.byte $05 ; SER_BAUD_300
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.byte $06 ; SER_BAUD_600
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.byte $07 ; SER_BAUD_1200
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.byte $FF ; SER_BAUD_1800
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.byte $08 ; SER_BAUD_2400
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.byte $FF ; SER_BAUD_3600
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.byte $09 ; SER_BAUD_3600
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.byte $0A ; SER_BAUD_4800
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.byte $FF ; SER_BAUD_7200
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.byte $0B ; SER_BAUD_7200
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.byte $0C ; SER_BAUD_9600
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.byte $0E ; SER_BAUD_19200
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.byte $0F ; SER_BAUD_38400
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@ -128,11 +126,6 @@ ParityTable:
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.byte $A0 ; SER_PAR_MARK
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.byte $E0 ; SER_PAR_SPACE
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HandshakeTable: ; bit7 = 1 means that setting is invalid
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.byte $FF ; SER_HS_NONE
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.byte $00 ; SER_HS_HW
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.byte $FF ; SER_HS_SW
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; Delay times: 32 byte-receive times in milliseconds, or 100 max.
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; Formula = 320,000 / baud. Invalid values do contain $FF.
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PauseTimes:
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@ -167,18 +160,22 @@ PauseTimes:
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INSTALL:
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; Deactivate DTR and disable 6551 interrupts
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lda #%00001010
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sta ACIA_CMD
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; Initialize buffers & control
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@L4: lda #0
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sta RecvHead
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sta SendHead
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sta RecvTail
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sta SendTail
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sta Errors
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sta Stopped
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lda #255
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sta RecvFreeCnt
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sta SendFreeCnt
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@L4: ldx #0
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stx RecvHead
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stx SendHead
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stx RecvTail
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stx SendTail
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stx Stopped
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dex ; X = 255
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stx RecvFreeCnt
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stx SendFreeCnt
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; Set up nmi's
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@ -188,27 +185,13 @@ INSTALL:
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sty NmiSave+1
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lda #<NmiHandler
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ldy #>NmiHandler
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sta NMIVec
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SetNMI: sta NMIVec
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sty NMIVec+1
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; Set default to 2400-8N1, enable interrupts
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lda ACIA_DATA
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lda ACIA_STATUS
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lda #$18
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sta ACIA_CTRL
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lda #$01
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sta RtsOff
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ora #$08
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sta ACIA_CMD
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lda #$06
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sta BaudCode
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; Done, return an error code
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lda #SER_ERR_OK
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tax
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lda #<SER_ERR_OK
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tax ; A is zero
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rts
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;----------------------------------------------------------------------------
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@ -219,169 +202,85 @@ UNINSTALL:
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; Stop interrupts, drop DTR
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lda RtsOff
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and #%11100010
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ora #%00000010
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sta ACIA_CMD
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lda #%00001010
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sta ACIA_CMD
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; Restore NMI vector
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; Restore NMI vector and return OK
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lda NmiSave+0
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ldy NmiSave+1
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sta NMIVec
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sty NMIVec+1
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; Flag uninitialized
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lda #SER_ERR_OK
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tax
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rts
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jmp SetNMI
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;----------------------------------------------------------------------------
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; PARAMS routine. A pointer to a ser_params structure is passed in ptr1.
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; Must return an SER_ERR_xx code in a/x.
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PARAMS:
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; First, check if the handshake setting is valid
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ldy #SER_PARAMS_HANDSHAKE ; Handshake
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lda (ptr1),y
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cmp #SER_HS_HW ; This is all we support
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bne InvParam
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; Set the value for the control register, which contains stop bits, word
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; length and the baud rate.
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ldy #SER_PARAMS_BAUDRATE
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lda (ptr1),y ; Baudrate index
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tax
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lda BaudTable,x ; Get 6551 value
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bmi invalid ; Branch if rate not supported
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tay
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lda BaudTable,y ; Get 6551 value
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bmi InvBaud ; Branch if rate not supported
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sta tmp1
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sty BaudCode ; Remember baud rate index
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iny ; Databits
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ldy #SER_PARAMS_DATABITS ; Databits
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lda (ptr1),y
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tax
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lda BitTable,x
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tay
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lda BitTable,y
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ora tmp1
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sta tmp1
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iny ; Stopbits
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ldy #SER_PARAMS_STOPBITS ; Stopbits
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lda (ptr1),y
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tax
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lda StopTable,x
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tay
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lda StopTable,y
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ora tmp1
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sta tmp1
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ora #%00010000 ; Receiver clock source = baudrate
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sta ACIA_CTRL
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iny ; Parity
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; Set the value for the command register. We remember the base value in
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; RtsOff, since we will have to manipulate ACIT_CMD often.
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ldy #SER_PARAMS_PARITY ; Parity
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lda (ptr1),y
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tax
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lda ParityTable,x
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ora tmp1
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sta tmp1
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tay
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lda ParityTable,y
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ora #%00000001 ; DTR active
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sta RtsOff
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ora #%00010000 ; Enable receive interrupts
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sta ACIA_CMD
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iny ; Handshake
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lda (ptr1),y
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tax
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lda HandshakeTable,x
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bmi invalid
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; Done
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lda #<SER_ERR_OK
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tax ; A is zero
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rts
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; Invalid parameter
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InvParam:
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lda #<SER_ERR_INIT_FAILED
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ldx #>SER_ERR_INIT_FAILED
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rts
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; Baud rate not available
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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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; /* Set the port parameters. Use a combination of the #defined values above. */
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;
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; Set communication parameters.
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;
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; baud rates stops word | parity
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; --------------------- ----- ----- | ---------
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; $00=50 $08=9600 $00=1 $00=8 | $00=none
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; $01=110 $09=19200 $80=2 $20=7 | $20=odd
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; $02=134.5 $0a=38400 $40=6 | $60=even
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; $03=300 $0b=57600 $60=5 | $A0=mark
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; $04=600 $0c=115200 | $E0=space
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; $05=1200 $0d=230400
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; $06=2400 $0e=future
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; $07=4800 $0f=future
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;
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_rs232_params:
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and #%11100000 ; Save new parity
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ora #%00000001
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sta tmp2
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; Check cpu speed against baud rate
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jsr popa
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sta tmp1
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and #$0f
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cmp #$0c
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bcc @L3
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ldx CpuSpeed ; ###
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cpx #1+1
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bcc @L2
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cmp #$0c
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beq @L3
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cpx #4
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bcs @L3
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@L2: lda #RS_ERR_BAUD_TOO_FAST
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bne @L9
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; Set baud/parameters
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@L3: lda tmp1
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and #$0f
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tax
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lda BaudTable,x
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cmp #$ff
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bne @L5
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lda #RS_ERR_BAUD_NOT_AVAIL
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bne @L9
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@L5: tax
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and #$30
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beq @L6
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bit Turbo232
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bmi @L6
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lda #RS_ERR_BAUD_NOT_AVAIL
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bne @L9
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@L6: lda tmp1
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and #$0f
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sta BaudCode
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lda tmp1
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and #%11100000
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ora #%00010000
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sta tmp1
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txa
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and #$0f
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ora tmp1
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sta ACIA_CTRL
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txa
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and #%00110000
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beq @L7
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lsr
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lsr
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lsr
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lsr
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eor #%00000011
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sta ACIA_CLOCK
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; Set new parity
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@L7: lda tmp2
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sta RtsOff
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ora #%00001000
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sta ACIA_CMD
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lda #0
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@L9: ldx #0
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rts
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.rodata
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BaudTable:
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.byte $ff,$ff,$ff,$05,$06,$07,$08,$0a,$0c,$0e,$0f,$10,$20,$30,$ff,$ff
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;in: 0 1 2 3 4 5 6 7 8 9 a b c d e f
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;baud50 110 134 3 6 12 24 48 96 19 38 57 115 230 exp exp
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;out masks: $0F=Baud, val$FF=err
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; $30=t232ExtBaud: $00=none, $10=57.6, $20=115.2, $30=230.4
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.code
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InvBaud:
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lda #<SER_ERR_BAUD_UNAVAIL
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ldx #>SER_ERR_BAUD_UNAVAIL
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rts
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;----------------------------------------------------------------------------
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; GET: Will fetch a character from the receive buffer and store it into the
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@ -394,7 +293,7 @@ GET:
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; Check for bytes to send
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ldx SendFreeCnt
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cpx #$ff
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inx ; X == $FF?
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beq @L1
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lda #$00
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jsr TryToSend
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@ -404,8 +303,8 @@ GET:
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@L1: lda RecvFreeCnt ; (25)
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cmp #$ff
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bne @L2
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lda #SER_ERR_NO_DATA
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ldx #0
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lda #<SER_ERR_NO_DATA
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ldx #>SER_ERR_NO_DATA
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rts
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; Check for flow stopped & enough free: release flow control
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@ -441,7 +340,7 @@ PUT:
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; Try to send
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ldx SendFreeCnt
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cpx #$ff
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inx ; X = $ff?
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beq @L2
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pha
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lda #$00
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@ -487,7 +386,7 @@ PAUSE:
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; Stop rx interrupts
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lda RtsOff
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ora #$02
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ora #%00000010 ; Disable interrupts
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sta ACIA_CMD
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lda #<SER_ERR_OK
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tax
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@ -522,17 +421,25 @@ UNPAUSE:
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;
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STATUS:
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; Get status
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lda ACIA_STATUS
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ldy #0
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sta (ptr1),y
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jsr PollReceive ; bug-recovery hack
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jsr PollReceive ; bug-recovery hack
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tya ; SER_ERR_OK
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tax
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rts
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;----------------------------------------------------------------------------
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; IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl
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; specific data in ptr1, and the ioctl code in A.
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; Must return an error code in a/x.
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;
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IOCTL:
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lda #<SER_ERR_INV_IOCTL ; We don't support ioclts for now
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ldx #>SER_ERR_INV_IOCTL
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rts
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;----------------------------------------------------------------------------
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;
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; NMI handler
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@ -548,46 +455,31 @@ STATUS:
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NmiHandler:
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pha
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lda ACIA_STATUS ;(4) ;status ;check for byte received
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and #$08 ;(2)
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beq @L9 ;(2*)
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lda ACIA_STATUS ;(4) ;status ;check for byte received
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and #$08 ;(2)
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beq @L9 ;(2*)
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cld
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txa
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pha
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tya
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pha
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lda ACIA_STATUS ;(4) opt ;status ;check for receive errors
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and #$07 ;(2) opt
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beq @L1 ;(3*)opt
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inc Errors ;(5^)opt
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@L1: lda ACIA_DATA ;(4) ;data ;get byte and put into receive buffer
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ldy RecvTail ;(4)
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ldx RecvFreeCnt ;(4)
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beq @L3 ;(2*)
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sta RecvBuf,y ;(5)
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inc RecvTail ;(6)
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dec RecvFreeCnt ;(6)
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cpx #33 ;(2) ;check for buffer space low
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bcc @L2 ;(2*)
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jmp NMIEXIT ;(3)
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@L1: lda ACIA_DATA ;(4) data ;get byte and put into receive buffer
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ldy RecvTail ;(4)
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ldx RecvFreeCnt ;(4)
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beq @L3 ;(2*) Jump if no space in receive buffer
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sta RecvBuf,y ;(5)
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inc RecvTail ;(6)
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dec RecvFreeCnt ;(6)
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cpx #33 ;(2) check for buffer space low
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bcc @L2 ;(2*)
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jmp NMIEXIT ;(3)
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; Assert flow control
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@L2: lda RtsOff ;(3) ;assert flow control if buffer space too low
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sta ACIA_CMD ;(4) ;command
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sta Stopped ;(3)
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jmp NMIEXIT ;(3)
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; Drop this char
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@L3: inc DropCnt+0 ; not time-critical
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bne @L4
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inc DropCnt+1
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bne @L4
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inc DropCnt+2
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bne @L4
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inc DropCnt+3
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@L4: jmp NMIEXIT
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@L2: lda RtsOff ;(3) assert flow control if buffer space too low
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sta ACIA_CMD ;(4) command
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sta Stopped ;(3)
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@L3: jmp NMIEXIT ;(3)
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@L9: pla
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jmp NmiContinue
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