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SuperCIC: enable SuperCIC lock detection without entering pair mode automatically

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This commit is contained in:
Maximilian Rehkopf 2011-08-17 00:00:59 +02:00
parent f5a394e169
commit 3da807f895
1 changed files with 32 additions and 17 deletions
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49
cic/supercic/supercic-key.asm
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@ -39,6 +39,8 @@ processor p12f629
; OK or no lock CIC | high
; error | low
; SuperCIC pair mode | 148.75kHz / 50% duty cycle
; SuperCIC host detected | scarce spikes (3.3us)
; but pair mode disabled |
;
; In case lockout fails, the region is switched automatically and
; will be used after the next reset.
@ -62,6 +64,7 @@ processor p12f629
; 0x4d buffer for eeprom access
; 0x4e loop variable for longwait
; 0x4f loop variable for wait
; 0x5d 0: SuperCIC pair mode available flag
; 0x5e SuperCIC pair mode detect (phase 1)
; 0x5f SuperCIC pair mode detect (phase 2)
; ---------------------------------------------------------------------
@ -86,7 +89,7 @@ isr
clrf 0x5e ; clear pair mode detect
clrf 0x5f ; clear pair mode detect
bsf 0x5f, 1 ;
nop
clrf 0x5d ; clear pair mode available
nop
nop
bsf INTCON, 7 ; re-enable interrupts (ISR will continue as main)
@ -248,11 +251,11 @@ loop1
movwf GPIO ; reset GPIO
movlw 0x14
call wait
btfsc 0x5d, 0 ; pair mode available signal
bcf GPIO, 4 ;
nop
nop
nop
nop
nop
bsf GPIO, 4 ;
btfsc GPIO, 0 ; both pins must be low...
goto die
btfsc GPIO, 1 ; ...when no bit transfer takes place
@ -374,11 +377,13 @@ mangle_key_withoutskip
andlw 0xf
addlw 0xf
movwf 0x20
btfsc 0x5d, 0 ; pair mode available signal
bcf GPIO, 4
nop
nop
nop
nop
nop
bsf GPIO, 4
nop
nop
nop
@ -451,6 +456,7 @@ mangle_key_withskip
andlw 0xf
addlw 0xf
movwf 0x20
;-------pair mode code-------
bcf GPIO, 0
movf GPIO, w
btfss GPIO, 3
@ -459,9 +465,11 @@ mangle_key_withskip
movf GPIO, w
movwf 0x5f
bcf GPIO, 0
btfsc GPIO, 3
clrf 0x5e
nop
btfsc 0x5d, 0 ; pair mode available signal
bcf GPIO, 4
bsf GPIO, 4
;-------end of pair mode code-------
btfss 0x20, 4 ; skip if half-byte carry
goto mangle_return ; +2 cycles in return
movf 0x20, w ; restore w (previously destroyed)
@ -550,11 +558,13 @@ mangle_lock_withoutskip
andlw 0xf
addlw 0xf
movwf 0x30
btfsc 0x5d, 0 ; pair mode available signal
bcf GPIO, 4
nop
nop
nop
nop
nop
bsf GPIO, 4
nop
nop
nop
@ -627,7 +637,7 @@ mangle_lock_withskip
andlw 0xf
addlw 0xf
movwf 0x30
;-------pair mode code-------
btfss 0x5e, 1
goto scic_pair_skip1
btfsc 0x5f, 1
@ -641,12 +651,17 @@ scic_pair_skip1
scic_pair_skip2
nop
nop
nop
nop
goto scic_pair_skip4
scic_pair_skip3
bcf GPIO, 4
bsf 0x5d, 0 ; set pair mode available
nop
nop
nop
nop
bsf GPIO, 4
scic_pair_skip4
;-------end of pair mode code-------
btfss 0x30, 4 ; skip if half-byte carry
goto mangle_return
nop