ld (_ramsize), hl
ld hl,#48
ld (_procmem), hl
+
; Play guess the serial port
- ld bc,#0x80
- ; If writing to 0x80 changes the data we see on an input then
- ; it's most likely an SIO and not the 68B50
- out (c),b
- in d,(c)
- inc b
- out (c),b
- in a,(c)
- sub d
-;;FIXME jr z, is_sio
- jr is_sio
- ; We have however pooped on the 68B50 setup so put it back into
- ; a sensible state.
- ld a,#0x03
- out (c),a
- in a,(c)
- or a
- jr nz, not_acia_either
+ ; This needs doing better. We might be fooled by floating flow
+ ; control lines as the SC104 does expose flow control. FIXME
+ in a,(SIOA_C)
+ and #0x2C
+ cp #0x2C
+ ; CTS and DCD should be high as they are not wired
+ jr nz, try_acia
+
+ ; Repeat the check on SIO B
+ in a,(SIOB_C)
+ and #0x2C
+ cp #0x2C
+ jr z, is_sio
+try_acia:
+ ;
+ ; Look for an ACIA
+ ;
+ ld a,#ACIA_RESET
+ out (ACIA_C),a
+ ; TX should now have gone
+ in a,(ACIA_C)
+ bit 1,a
+ jr z, not_acia_either
+ ; Set up the ACIA
+
ld a, #ACIA_RTS_LOW_A
- out (c),a ; Initialise ACIA
+ out (ACIA_C),a ; Initialise ACIA
ld a,#2
ld (_ser_type),a
- ret
+ jp serial_up
;
; Doomed I say .... doomed, we're all doomed
not_acia_either:
xor a
ld (_ser_type),a
- ret
-
+ jp serial_up
+;
+; We have an SIO so do the required SIO hdance
+;
is_sio: ld a,b
ld (_ser_type),a
-init_partial_uart:
-
- ld a,#0x00
- out (SIOA_C),a
- ld a,#0x18
- out (SIOA_C),a
-
- ld a,#0x04
- out (SIOA_C),a
- ld a,#0xC4
- out (SIOA_C),a
-
- ld a,#0x01
- out (SIOA_C),a
- ld a,#0x18;A? ; Receive int mode 11, tx int enable (was $18)
- out (SIOA_C),a
-
- ld a,#0x03
- out (SIOA_C),a
- ld a,#0xE1
- out (SIOA_C),a
-
- ld a,#0x05
- out (SIOA_C),a
- ld a,#RTS_LOW
- out (SIOA_C),a
-
- ld a,#0x00
- out (SIOB_C),a
- ld a,#0x18
- out (SIOB_C),a
-
- ld a,#0x04
- out (SIOB_C),a
- ld a,#0xC4
- out (SIOB_C),a
-
- ld a,#0x01
- out (SIOB_C),a
- ld a, #0x18;A? ; Receive int mode 11, tx int enable (was $18)
- out (SIOB_C),a
-
- ld a,#0x03
- out (SIOB_C),a
- ld a,#0xE1
- out (SIOB_C),a
-
- ld a,#0x05
- out (SIOB_C),a
- ld a,#RTS_LOW
- out (SIOB_C),a
+ ld hl,#sio_setup
+ ld bc,#0xA00 + SIOA_C ; 10 bytes to SIOA_C
+ otir
+ ld hl,#sio_setup
+ ld bc,#0x0A00 + SIOB_C ; and to SIOB_C
+ otir
+serial_up:
; ---------------------------------------------------------------------
; Initialize CTC
;
im 1 ; set Z80 CPU interrupt mode 1
ret
+sio_setup:
+ .byte 0x00
+ .byte 0x18 ; Reset
+ .byte 0x04
+ .byte 0xC4
+ .byte 0x01
+ .byte 0x18
+ .byte 0x03
+ .byte 0xE1
+ .byte 0x05
+ .byte RTS_LOW
+
;=========================================================================
; Kernel code
;=========================================================================
;=========================================================================
.area _DISCARD
init_hardware:
+ ; program vectors for the kernel
+ ld hl, #0
+ push hl
+ call _program_vectors
+ pop hl
+
+ ; Stop floppy drive motors
+ ld a, #0x0C
+ out (FDC_DOR), a
+
; Play guess the serial port
- ld bc,#0x80
- ; If writing to 0x80 changes the data we see on an input then
- ; it's most likely an SIO and not the 68B50
- out (c),b
- in d,(c)
- inc b
- out (c),b
- in a,(c)
- sub d
-;;FIXME jr z, is_sio
- jr is_sio
- ; We have however pooped on the 68B50 setup so put it back into
- ; a sensible state.
- ld a,#0x03
- out (c),a
- in a,(c)
- or a
- jr nz, not_acia_either
+ ; This needs doing better. We might be fooled by floating flow
+ ; control lines as the SC104 does expose flow control. FIXME
+ in a,(SIOA_C)
+ and #0x2C
+ cp #0x2C
+ ; CTS and DCD should be high as they are not wired
+ jr nz, try_acia
+
+ ; Repeat the check on SIO B
+ in a,(SIOB_C)
+ and #0x2C
+ cp #0x2C
+ jr z, is_sio
+try_acia:
+ ;
+ ; Look for an ACIA
+ ;
+ ld a,#ACIA_RESET
+ out (ACIA_C),a
+ ; TX should now have gone
+ in a,(ACIA_C)
+ bit 1,a
+ jr z, not_acia_either
+ ; Set up the ACIA
+
ld a, #ACIA_RTS_LOW_A
- out (c),a ; Initialise ACIA
+ out (ACIA_C),a ; Initialise ACIA
ld a,#2
ld (_ser_type),a
jp serial_up
xor a
ld (_ser_type),a
jp serial_up
-
+;
+; We have an SIO so do the required SIO hdance
+;
is_sio: ld a,b
ld (_ser_type),a
- ; program vectors for the kernel
- ld hl, #0
- push hl
- call _program_vectors
- pop hl
-
- ; Stop floppy drive motors
- ld a, #0x0C
- out (FDC_DOR), a
-
- ; initialize UART0
- ld a, (_boot_from_rom) ; do not set the baud rate and other
- or a ; serial line parameters if the BIOS
- jr z, init_partial_uart ; already set them for us.
- ; nothing to do here yet
-init_partial_uart:
-
- ld a,#0x00
- out (SIOA_C),a
- ld a,#0x18
- out (SIOA_C),a
-
- ld a,#0x04
- out (SIOA_C),a
- ld a,#0xC4
- out (SIOA_C),a
-
- ld a,#0x01
- out (SIOA_C),a
- ld a,#0x18;A? ; Receive int mode 11, tx int enable (was $18)
- out (SIOA_C),a
-
- ld a,#0x03
- out (SIOA_C),a
- ld a,#0xE1
- out (SIOA_C),a
-
- ld a,#0x05
- out (SIOA_C),a
- ld a,#RTS_LOW
- out (SIOA_C),a
-
- ld a,#0x00
- out (SIOB_C),a
- ld a,#0x18
- out (SIOB_C),a
-
- ld a,#0x04
- out (SIOB_C),a
- ld a,#0xC4
- out (SIOB_C),a
-
- ld a,#0x01
- out (SIOB_C),a
- ld a, #0x18;A? ; Receive int mode 11, tx int enable (was $18)
- out (SIOB_C),a
-
- ld a,#0x02
- out (SIOB_C),a
- ld a,#SIO_IV ; INTERRUPT VECTOR ADDRESS (needs to go)
- out (SIOB_C),a
-
- ld a,#0x03
- out (SIOB_C),a
- ld a,#0xE1
- out (SIOB_C),a
-
- ld a,#0x05
- out (SIOB_C),a
- ld a,#RTS_LOW
- out (SIOB_C),a
+ ld hl,#sio_setup
+ ld bc,#0xA00 + SIOA_C ; 10 bytes to SIOA_C
+ otir
+ ld hl,#sio_setup
+ ld bc,#0x0A00 + SIOB_C ; and to SIOB_C
+ otir
+serial_up:
; ---------------------------------------------------------------------
; Initialize CTC
;
; ---------------------------------------------------------------------
im 1 ; set Z80 CPU interrupt mode 1
-serial_up:
jp _init_hardware_c ; pass control to C, which returns for us
+sio_setup:
+ .byte 0x00
+ .byte 0x18 ; Reset
+ .byte 0x04
+ .byte 0xC4
+ .byte 0x01
+ .byte 0x18
+ .byte 0x03
+ .byte 0xE1
+ .byte 0x05
+ .byte RTS_LOW
+
;=========================================================================
; Kernel code
;=========================================================================
public / FUZIX.git / commitdiff