mirror of
https://github.com/cc65/cc65.git
synced 2024-07-14 04:29:00 +00:00
d6c3bd29ac
This change was suppsed to fix the issue that the former JUMPTABLE is merked as 'ro' while it is actually written to in several scenarios. When drivers are converted using co65 and then compiled into ROMs the JUMPTABLE isn't copied to RAM and therefore the write operations in question fail. However unfortunately I didn't succeed in changing that :-( Just setting the former JUMPTABLE to 'rw' broke the drivers. So I placed the DATA segment directly after the former JUMPTABLE segment. This made the drivers converted with co65 work again - obviously after changing libsrc/Makefile:235 from '--code-label' to '--data-label'. But the actual dynamic drivers still didn't work as the former JUMPTABLE wasn't placed as the beginning of the loaded file anymore. That effect could be changed by exchanging src/ld65/o65.c:1391 with src/ld65/o65.c:1394 but doing so broke the drivers again :-((
412 lines
10 KiB
ArmAsm
412 lines
10 KiB
ArmAsm
;
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; Serial driver for the Atari Lynx ComLynx port.
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;
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; Karri Kaksonen, 17.09.2009
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;
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.include "lynx.inc"
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.include "zeropage.inc"
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.include "ser-kernel.inc"
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.include "ser-error.inc"
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "HEADER"
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; Driver signature
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.byte $73, $65, $72 ; "ser"
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.byte SER_API_VERSION ; Serial API version number
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; Library reference
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.addr $0000
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; Jump table
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.addr INSTALL
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.addr UNINSTALL
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.addr OPEN
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.addr CLOSE
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.addr GET
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.addr PUT
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.addr STATUS
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.addr IOCTL
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.addr IRQ
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;----------------------------------------------------------------------------
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; Global variables
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;
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.bss
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TxBuffer: .res 256
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RxBuffer: .res 256
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RxPtrIn: .res 1
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RxPtrOut: .res 1
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TxPtrIn: .res 1
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TxPtrOut: .res 1
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contrl: .res 1
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SerialStat: .res 1
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TxDone: .res 1
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.code
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;----------------------------------------------------------------------------
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; INSTALL: Is called after the driver is loaded into memory.
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;
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; Must return an SER_ERR_xx code in a/x.
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INSTALL:
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; Set up IRQ vector ?
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;----------------------------------------------------------------------------
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; UNINSTALL: Is called before the driver is removed from memory.
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; No return code required (the driver is removed from memory on return).
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;
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UNINSTALL:
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;----------------------------------------------------------------------------
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; CLOSE: Close the port and disable interrupts. Called without parameters.
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; Must return an SER_ERR_xx code in a/x.
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CLOSE:
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; Disable interrupts
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; Done, return an error code
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lda #<SER_ERR_OK
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ldx #>SER_ERR_OK
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rts
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;----------------------------------------------------------------------------
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; OPEN: A pointer to a ser_params structure is passed in ptr1.
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;
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; The Lynx has only two correct serial data formats:
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; 8 bits, parity mark, 1 stop bit
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; 8 bits, parity space, 1 stop bit
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;
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; It also has two wrong formats;
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; 8 bits, even parity, 1 stop bit
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; 8 bits, odd parity, 1 stop bit
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;
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; Unfortunately the parity bit includes itself in the calculation making
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; parity not compatible with the rest of the world.
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;
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; We can only specify a few baud rates.
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; Lynx has two non-standard speeds 31250 and 62500 which are
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; frequently used in games.
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;
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; The receiver will always read the parity and report parity errors.
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;
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; Must return an SER_ERR_xx code in a/x.
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OPEN:
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stz RxPtrIn
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stz RxPtrOut
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stz TxPtrIn
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stz TxPtrOut
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; clock = 8 * 15625
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lda #%00011000
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sta TIM4CTLA
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ldy #SER_PARAMS::BAUDRATE
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lda (ptr1),y
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ldx #1
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cmp #SER_BAUD_62500
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beq setbaudrate
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ldx #2
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cmp #SER_BAUD_31250
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beq setbaudrate
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ldx #12
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cmp #SER_BAUD_9600
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beq setbaudrate
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ldx #25
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cmp #SER_BAUD_4800
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beq setbaudrate
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ldx #51
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cmp #SER_BAUD_2400
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beq setbaudrate
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ldx #103
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cmp #SER_BAUD_1200
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beq setbaudrate
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ldx #207
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cmp #SER_BAUD_600
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beq setbaudrate
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; clock = 6 * 15625
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ldx #%00011010
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stx TIM4CTLA
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ldx #12
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cmp #SER_BAUD_7200
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beq setbaudrate
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ldx #25
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cmp #SER_BAUD_3600
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beq setbaudrate
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ldx #207
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stx TIM4BKUP
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; clock = 4 * 15625
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ldx #%00011100
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cmp #SER_BAUD_300
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beq setprescaler
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; clock = 6 * 15625
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ldx #%00011110
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cmp #SER_BAUD_150
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beq setprescaler
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; clock = 1 * 15625
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ldx #%00011111
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stx TIM4CTLA
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cmp #SER_BAUD_75
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beq baudsuccess
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ldx #141
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cmp #SER_BAUD_110
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beq setbaudrate
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; clock = 2 * 15625
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ldx #%00011010
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stx TIM4CTLA
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ldx #68
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cmp #SER_BAUD_1800
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beq setbaudrate
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; clock = 6 * 15625
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ldx #%00011110
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stx TIM4CTLA
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ldx #231
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cmp #SER_BAUD_134_5
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beq setbaudrate
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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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setprescaler:
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stx TIM4CTLA
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bra baudsuccess
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setbaudrate:
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stx TIM4BKUP
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baudsuccess:
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ldx #TxOpenColl|ParEven
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stx contrl
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ldy #SER_PARAMS::DATABITS ; Databits
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lda (ptr1),y
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cmp #SER_BITS_8
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bne invparameter
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ldy #SER_PARAMS::STOPBITS ; Stopbits
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lda (ptr1),y
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cmp #SER_STOP_1
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bne invparameter
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ldy #SER_PARAMS::PARITY ; Parity
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lda (ptr1),y
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cmp #SER_PAR_NONE
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beq invparameter
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cmp #SER_PAR_MARK
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beq checkhs
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cmp #SER_PAR_SPACE
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bne @L0
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ldx #TxOpenColl
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stx contrl
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bra checkhs
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@L0:
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ldx #TxParEnable|TxOpenColl|ParEven
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stx contrl
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cmp #SER_PAR_EVEN
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beq checkhs
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ldx #TxParEnable|TxOpenColl
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stx contrl
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checkhs:
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ldx contrl
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stx SERCTL
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ldy #SER_PARAMS::HANDSHAKE ; Handshake
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lda (ptr1),y
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cmp #SER_HS_NONE
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bne invparameter
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lda SERDAT
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lda contrl
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ora #RxIntEnable|ResetErr
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sta SERCTL
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lda #<SER_ERR_OK
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ldx #>SER_ERR_OK
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rts
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invparameter:
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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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;----------------------------------------------------------------------------
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; GET: Will fetch a character from the receive buffer and store it into the
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; variable pointed to by ptr1. If no data is available, SER_ERR_NO_DATA is
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; returned.
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GET:
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lda RxPtrIn
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cmp RxPtrOut
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bne GetByte
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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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GetByte:
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ldy RxPtrOut
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lda RxBuffer,y
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inc RxPtrOut
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ldx #$00
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sta (ptr1,x)
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txa ; Return code = 0
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rts
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;----------------------------------------------------------------------------
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; PUT: Output character in A.
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; Must return an SER_ERR_xx code in a/x.
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PUT:
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tax
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lda TxPtrIn
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ina
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cmp TxPtrOut
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bne PutByte
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lda #<SER_ERR_OVERFLOW
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ldx #>SER_ERR_OVERFLOW
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rts
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PutByte:
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ldy TxPtrIn
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txa
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sta TxBuffer,y
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inc TxPtrIn
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bit TxDone
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bmi @L1
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php
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sei
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lda contrl
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ora #TxIntEnable|ResetErr
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sta SERCTL ; Allow TX-IRQ to hang RX-IRQ
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sta TxDone
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plp
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@L1:
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lda #<SER_ERR_OK
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tax
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rts
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;----------------------------------------------------------------------------
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; STATUS: Return the status in the variable pointed to by ptr1.
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; Must return an SER_ERR_xx code in a/x.
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STATUS:
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ldy SerialStat
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ldx #$00
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sta (ptr1,x)
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txa ; Return code = 0
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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 SER_ERR_xx code in a/x.
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IOCTL:
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lda #<SER_ERR_INV_IOCTL
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ldx #>SER_ERR_INV_IOCTL
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rts
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;----------------------------------------------------------------------------
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; IRQ: Called from the builtin runtime IRQ handler as a subroutine. All
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; registers are already saved, no parameters are passed, but the carry flag
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; is clear on entry. The routine must return with carry set if the interrupt
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; was handled, otherwise with carry clear.
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;
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; Both the Tx and Rx interrupts are level sensitive instead of edge sensitive.
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; Due to this bug you have to disable the interrupt before clearing it.
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IRQ:
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lda INTSET ; Poll all pending interrupts
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and #SERIAL_INTERRUPT
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bne @L0
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clc
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rts
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@L0:
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bit TxDone
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bmi @tx_irq ; Transmit in progress
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ldx SERDAT
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lda SERCTL
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and #RxParityErr|RxOverrun|RxFrameErr|RxBreak
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beq @rx_irq
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tsb SerialStat ; Save error condition
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bit #RxBreak
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beq @noBreak
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stz TxPtrIn ; Break received - drop buffers
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stz TxPtrOut
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stz RxPtrIn
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stz RxPtrOut
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@noBreak:
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lda contrl
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ora #RxIntEnable|ResetErr
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sta SERCTL
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lda #$10
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sta INTRST
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bra @IRQexit
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@rx_irq:
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lda contrl
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ora #RxIntEnable|ResetErr
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sta SERCTL
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txa
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ldx RxPtrIn
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sta RxBuffer,x
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txa
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inx
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@cont0:
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cpx RxPtrOut
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beq @1
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stx RxPtrIn
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lda #SERIAL_INTERRUPT
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sta INTRST
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bra @IRQexit
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@1:
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sta RxPtrIn
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lda #$80
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tsb SerialStat
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@tx_irq:
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ldx TxPtrOut ; Has all bytes been sent?
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cpx TxPtrIn
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beq @allSent
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lda TxBuffer,x ; Send next byte
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sta SERDAT
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inc TxPtrOut
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@exit1:
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lda contrl
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ora #TxIntEnable|ResetErr
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sta SERCTL
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lda #SERIAL_INTERRUPT
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sta INTRST
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bra @IRQexit
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@allSent:
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lda SERCTL ; All bytes sent
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bit #TxEmpty
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beq @exit1
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bvs @exit1
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stz TxDone
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lda contrl
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ora #RxIntEnable|ResetErr
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sta SERCTL
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lda #SERIAL_INTERRUPT
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sta INTRST
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@IRQexit:
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clc
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rts
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