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IIgs SCC: Allow choosing 115200bps as the card allows it
Of course, that won't work full speed with the standard IRQ-based RX. But that will allow users to setup the port at this speed without duplicating the setup part of the code. Up to them to add hooks to disable IRQs and read directly in a tight asm loop.
This commit is contained in:
Colin Leroy-Mira
Oliver Schmidt
parent
3fd78208ba
commit
8b71fafb84
@ -66,6 +66,8 @@ HSType: .res 1 ; Flow-control type
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RecvBuf: .res 256 ; Receive buffers: 256 bytes
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SendBuf: .res 256 ; Send buffers: 256 bytes
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ClockSource: .res 1 ; Whether to use BRG or XTAL for clock
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.data
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Opened: .byte $00 ; 1 when opened
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@ -106,6 +108,15 @@ TxBitTable: .byte %00000000 ; SER_BITS_5, in WR_TX_CTRL (WR5)
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.rodata
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ClockMultiplier:.byte %01000000 ; Clock x16 (300-57600bps, ref page 5-8)
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.byte %10000000 ; Clock x32 (115200bps, ref page 5-8)
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ClockSourceA: .byte %11010000 ; Use baud rate generator (page 5-17)
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.byte %10000000 ; Use XTAL (115200bps)
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ClockSourceB: .byte %01010000 ; Use baud rate generator
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.byte %00000000 ; Use XTAL (115200bps)
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BaudTable: ; bit7 = 1 means setting is invalid
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; Otherwise refers to the index in
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; Baud(Low/High)Table
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@ -127,7 +138,7 @@ BaudTable: ; bit7 = 1 means setting is invalid
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.byte $05 ; SER_BAUD_19200
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.byte $06 ; SER_BAUD_38400
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.byte $07 ; SER_BAUD_57600
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.byte $FF ; SER_BAUD_115200
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.byte $00 ; SER_BAUD_115200
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.byte $FF ; SER_BAUD_230400
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StopTable: .byte %00000100 ; SER_STOP_1, in WR_TX_RX_CTRL (WR4)
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@ -180,7 +191,6 @@ RX_CTRL_OFF = %11111110 ; ANDed,Rx disabled
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WR_TX_RX_CTRL = 4
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RR_TX_RX_STATUS = 4
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TX_RX_CLOCK_MUL = %01000000 ; Clock x16 (Ref page 5-8)
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WR_TX_CTRL = 5 ; (Ref page 5-9)
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RR_TX_STATUS = 5 ; Corresponding status register
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@ -197,15 +207,13 @@ MASTER_IRQ_MIE_RST = %00001010 ; STA'd
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MASTER_IRQ_SET = %00011001 ; STA'd
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WR_CLOCK_CTRL = 11 ; (Ref page 5-17)
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CLOCK_CTRL_CH_A = %11010000
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CLOCK_CTRL_CH_B = %01010000
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WR_BAUDL_CTRL = 12 ; (Ref page 5-18)
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WR_BAUDH_CTRL = 13 ; (Ref page 5-19)
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WR_MISC_CTRL = 14 ; (Ref page 5-19)
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MISC_CTRL_RATE_GEN_ON = %00000001 ; ORed
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MISC_CTRL_RATE_GEN_OFF = %11111110 ; ANDed
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MISC_CTRL_RATE_GEN_ON = %00000001 ; STA'd
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MISC_CTRL_RATE_GEN_OFF = %00000000 ; STA'd
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WR_IRQ_CTRL = 15 ; (Ref page 5-20)
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IRQ_CLEANUP_EIRQ = %00001000
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@ -329,6 +337,16 @@ IIgs:
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: txa ; Promote char return value
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rts
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getClockSource:
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ldy #SER_PARAMS::BAUDRATE
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lda (ptr1),y ; Baudrate index - cc65 value
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ldy #$01
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cmp #SER_BAUD_115200
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beq :+
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ldy #$00
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: sty ClockSource
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rts
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;----------------------------------------------------------------------------
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; SER_OPEN: 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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@ -364,6 +382,8 @@ SER_OPEN:
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lda #$00
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jsr writeSCCReg
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jsr getClockSource ; Should we use BRG or XTAL?
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ldy #SER_PARAMS::STOPBITS
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lda (ptr1),y ; Stop bits
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tay
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@ -377,16 +397,18 @@ SER_OPEN:
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ora ParityTable,y ; Get value
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bmi InvParam
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ora #TX_RX_CLOCK_MUL
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ldy ClockSource ; Setup clock multiplier
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ora ClockMultiplier,y
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ldy #WR_TX_RX_CTRL ; Setup stop & parity bits
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jsr writeSCCReg
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ldy ClockSource
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cpx #CHANNEL_B
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bne ClockA
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ClockB:
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lda ClockSourceB,y
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ldy #WR_CLOCK_CTRL
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lda #CLOCK_CTRL_CH_B
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jsr writeSCCReg
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lda #INTR_PENDING_RX_EXT_B ; Store which IRQ bits we'll check
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@ -394,8 +416,8 @@ ClockB:
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bra SetBaud
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ClockA:
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lda ClockSourceA,y
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ldy #WR_CLOCK_CTRL
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lda #CLOCK_CTRL_CH_A
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jsr writeSCCReg
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lda #INTR_PENDING_RX_EXT_A ; Store which IRQ bits we'll check
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@ -411,11 +433,16 @@ SetBaud:
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InvParam:
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lda #SER_ERR_INIT_FAILED
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ldy #$00 ; Mark port closed
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bra SetupOut
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ldx #$00 ; Promote char return value
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stz Opened ; Mark port closed
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cli
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rts
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BaudOK:
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tay
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cpy #SER_BAUD_115200
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beq :+ ; Skip baud rate generator setup:
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; For 115200bps, we use XTAL instead
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lda BaudLowTable,y ; Get low byte
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@ -428,8 +455,13 @@ BaudOK:
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ldy #WR_BAUDH_CTRL
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jsr writeSCCReg
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ldy #WR_MISC_CTRL ; Time to turn this thing on
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lda #MISC_CTRL_RATE_GEN_ON
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: lda #MISC_CTRL_RATE_GEN_ON ; Setup BRG according to selected rate
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ldy ClockSource
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cpy #$00
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beq :+
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lda #MISC_CTRL_RATE_GEN_OFF
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: ldy #WR_MISC_CTRL ; Time to turn this thing on
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jsr writeSCCReg
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ldy #SER_PARAMS::DATABITS
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@ -486,11 +518,11 @@ StoreFlag:
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sta SER_FLAG
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ldy #$01 ; Mark port opened
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lda #SER_ERR_OK
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SetupOut:
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ldx #$00 ; Promote char return value
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sty Opened
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lda #SER_ERR_OK
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ldx #$00 ; Promote char return value
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cli
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rts
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