mirror of
https://github.com/forth-ev/VolksForth.git
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375 lines
24 KiB
Plaintext
375 lines
24 KiB
Plaintext
Screen 0 not modified
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0 \ Serial interface for IBM-PC using 8250 chip cas 11nov05
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1
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2 INCLUDE SERIAL.FB will load code for COM1,
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3 2 LOADFROM SERIAL.FB for COM2
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4
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5 Bytes recieved will be buffered in a 128 Byte deep Queue
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6 by an interrupt Routine.
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7
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8 The DTR Line will be used to signal that new bytes can be
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9 recieved.
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10 The Sender will recognize CTS, a full Handshake is implemented
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11
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12 Xon/Xoff Protocoll using ^S/^Q is _not_ implemented.
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13
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14 Sender: TX? ( -- f ) TX ( -- char )
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15 Empf„nger: RX? ( -- f ) RX ( char -- )
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Screen 1 not modified
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0 \ Driver for IBM-PC Serial card using 8250 cas 11nov05
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1 Onlyforth \needs Assembler 2 loadfrom asm.fb
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2
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3 cr .( COM1: )
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4
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5 | $C 4 * Constant SINT@ \ absolute loc. of serial interrupt
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6
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7 $3F8 >label Portadr
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8
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9 | $10 Constant I_level \ 8259 priority
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10
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11 2 7 +thru
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12
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Screen 2 not modified
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0 \ Driver for IBM-PC Serial card using 8250 cas 11nov05
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1 Onlyforth \needs Assembler 2 loadfrom asm.fb
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2
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3 cr .( COM2: )
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4
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5 | $B 4 * Constant SINT@ \ absolute loc. of serial interrupt
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6
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7 $2F8 >label Portadr
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8
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9 | 8 Constant I_level \ 8259 priority
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10
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11 1 6 +thru
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12
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Screen 3 not modified
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0 \ Driver for IBM-PC Serial card using 8250 ks 11 mai 88
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1 \ 3 .( 38.4 kbaud )
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2 \ &6 .( 19.2 kbaud )
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3 &12 .( 9.6 kbaud )
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4 \ &24 .( 4.8 kbaud )
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5 \ &96 .( 1200 baud )
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6 >label baud
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7
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8 $20 >label I_ctrl $21 >label I_mask \ 8259 addresses
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9
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10 Create Queue 0 , $80 allot
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11 \ 0 1 2 130 byte address
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12 \ | len | out |<-- 128 byte Queue -->|
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13 \ len ::= number of characters queued
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14 \ out ::= relativ address of next output character
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15 \ (len+out)mod(128) ::= relative address of first empty byte
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Screen 4 not modified
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0 \ transmit to 8250 ks 11 dez 87
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1
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2 Code tx? ( -- f ) D push Portadr 5 + # D mov
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3 D in D D xor $1020 # A and $1020 # A cmp
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4 0= ?[ D dec ]? Next end-code
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5
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6 Code tx ( c -- ) D- A- xchg Portadr # D mov
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7 D byte out D pop Next end-code
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8
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9 Code -dtr D push Portadr 4 + # D mov
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10 D byte in $1E # A- and D byte out D pop Next
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11 end-code
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12
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13 Code +dtr D push Portadr 4 + # D mov
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14 D byte in 1 # A- or D byte out D pop Next
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15 end-code
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Screen 5 not modified
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0 \ receive queue and interrupt service routine ks 11 dez 87
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1
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2 Label S_INT D push I push A push
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3 Portadr # D mov D byte in A- D+ mov
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4 Queue # I mov C: seg I ) A mov A- D- mov D- inc
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5 C: seg D- I ) mov A+ A- add $7F # A and A I add
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6 C: seg D+ 2 I D) mov $68 # D- cmp CS not
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7 ?[ Portadr 4 + # D mov
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8 D byte in $1E # A- and D byte out ]? \ -DTR
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9 $20 # A- mov I_ctrl #) byte out \ EOI for 8259
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10 A pop I pop D pop iret
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11 end-code
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15
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Screen 6 not modified
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0 \ rx? rx ks 30 dez 87
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1
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2 Code rx? ( -- f ) D push D D xor
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3 Queue #) D- mov D- D- or 0=
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4 ?[ [[ D push Portadr 4 + # D mov \ +DTR
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5 D byte in 9 # A- or D byte out D pop
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6 swap ]? Next end-code
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7
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8 Code rx ( -- 8b ) I W mov Queue # I mov
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9 D push D D xor cli lods A- A- or 0= not
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10 ?[ A+ C- mov A- dec A+ inc $7F # A+ and
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11 A -2 I D) mov D- C+ mov C I add I ) D- mov
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12 ]? sti W I mov $18 # A- cmp CS not ?] Next
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13 end-code
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14
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15
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Screen 7 not modified
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0 \ Serial initialization ks 25 apr 86
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1
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2 | Code S_init D push D: push A A xor A D: mov C: A mov
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3 SINT@ # W mov S_INT # W ) mov A 2 W D) mov D: pop
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4 Portadr 3 + # D mov $80 # A- mov D byte out \ DLAB = 1
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5 2 # D sub baud # A mov A- A+ xchg D byte out
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6 D dec A- A+ xchg D byte out \ baudrate
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7 3 # D add $A07 # A mov D out \ 8bit, noP, +RTS +OUT
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8 2 # D sub 1 # A- mov D byte out \ +rxINT
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9 I_mask #) byte in I_level Forth not Assembler # A- and
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10 I_mask #) byte out D pop Next
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11 end-code
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12
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Screen 8 not modified
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0 \ init bye ks 11 dez 87
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1 \needs init : init ;
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2
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3 : init init Queue off S_init ; init
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4
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5 : bye 0 [ Portadr 1+ ] Literal pc! \ -rxINT
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6 0 [ Portadr 4 + ] Literal pc! \ -dtr/-rts/-out2
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7 I_mask pc@ I_level or I_mask pc! bye ;
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8
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Screen 9 not modified
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0 \ dumb terminal via 8250 ks 11 dez 87
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1
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2 Variable Fkeys Fkeys on
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3
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4 | : ?rx ( -- ) pause rx? 0=exit rx
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5 Fkeys @ 0= IF emit ?cr exit THEN
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6 #LF case? IF cr exit THEN
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7 #CR case? IF Row 0 at exit THEN
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8 #BS case? IF del exit THEN emit ;
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9
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10 | : ?tx ( c -- ) BEGIN ?rx tx? UNTIL tx ;
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11
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12 : dumb BEGIN BEGIN ?rx key? UNTIL key
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13 $1B case? IF -dtr exit THEN ?tx REPEAT ;
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14
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Screen 10 not modified
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