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webserver: comment the memcpy routine

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This commit is contained in:
Vince Weaver 2016-12-16 16:51:54 -05:00
parent db067ba91c
commit 2d8646f724
1 changed files with 73 additions and 1 deletions
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74
ethernet/webserver.bas
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@ -28,7 +28,10 @@
33 POKE DP,192:POKE DP,168:POKE DP,8:POKE DP,15
40 PRINT "UTHERNET II READY: 192.168.8.15"
'
' Setup Memcpy routine
' Setup Machine Language Memcpy routine
' NOTE! This code assumes the Uthernet is in slot 3
' FIXME: patch on the fly once it works
' See Appendix 1 at the end of this for more details
'
50 FOR I=0 TO 72: READ X: POKE 768+I,X:NEXT I
51 DATA 169,0,133,6,169,64,133,7,162,11,240,36,160,0,177,6
@ -332,3 +335,72 @@
' 0x32 SOCK_IPRAW
' 0x42 SOCK_MACRAW
' 0x5f SOCK_PPOE
'
' Appendix 1: The memcpy machine code
'
'
'PTR EQU $06
'PTRH EQU $07
'
'WRAPL EQU $08
'WRAPH EQU $09
'
'SIZEL EQU $0A
'SIZEH EQU $0B
'
'tx_copy:
'
' lda #0 ; always copying from 0x4000
' sta PTR
' lda #$40
' sta PTR+1
'
' ldx #SIZEH ; number of 256-byte blocks
' beq copy_remainder ; if none, skip ahead
'
' ldy #0
'copy256:
' lda (PTR),y
' sta $C0B7 ; change based on uthernet slot
'
' cmp WRAPH,x
' bne nowrap256
'
' cmp WRAPL,y
' bne nowrap256
'
' lda #$40
' sta $C0B5
' lda #$00
' sta $C0B6 ; wrap tx buffer address to 0x4000
'
'nowrap256:
' iny
' bne copy256
'
' inc PTR+1 ; update 16-bit pointer
' dex ; finish a 256 byte block
' bne copy256
'
' ldx #SIZEL
'copy_remainder:
' lda (PTR),y
' sta $C0B7 ; change based on uthernet slot
'
' cmp WRAPL,y
' bne nowrap_r
'
' lda #$40
' sta $C0B5
' lda #$00
' sta $C0B6 ; wrap tx buffer address to 0x4000
'
'nowrap_r:
' iny
' dex
' bne copy_remainder
'
' rts