Posted By
Harry Potter
on 2022-06-21
14:05:41
|  Plus4Cart issue w/ printf(): lock-up at start-up
Hi! I got my Plus4/cc65 cartridge libraries to work, but now, there is a problem: I added my own version of printf() to the test program. Now, the program locks up at start-up.  I disabled the line in the crt0.s file that calls initlib, and the program locks up at the call to printf(). I looked at the source for a reference to the init routines and didn't find anything. What in printf() would be called from initlib? Or do I need to check out the initlib function? Following is the crt0.s file:
--------------------
startup:
;Thi
sei
ldx #$ff
txs
lda $fb
pha
;ldx #$02 ; cartrige 1 lo, kernal
sta $FDD2
jsr $FF84 ; Initialize I/O devices
jsr $FF87 ; RAM Test
pla
sta $FB
jsr $FF8A ; Restore vectors to initial values
jsr $FF81 ; Initialize screen editor
cli
; Switch to second charset
lda #14
jsr $FFD2
; Clear the BSS data
jsr zerobss
;lda #<(__RAM_START__ + __RAM_SIZE__)
lda #$00
sta sp
;lda #>(__RAM_START__ + __RAM_SIZE__)
lda #$80
sta sp+1 ; Set argument stack ptr
lda #$03
sta $FF0C
lda #$FF
sta $FF0D
; If we have IRQ functions, chain our stub into the IRQ vector
; lda #<__INTERRUPTOR_COUNT__
; beq NoIRQ1
; lda IRQVec
; ldx IRQVec+1
; sta IRQInd+1
; stx IRQInd+2
; lda #; ldx #>IRQStub
; sei
; sta IRQVec
; stx IRQVec+1
; cli
; Call module constructors
NoIRQ1:
lda #<__DATA_RUN__
ldx #>__DATA_RUN__
jsr pushax
lda #<__DATA_LOAD__
ldx #>__DATA_LOAD__
jsr pushax
lda #<__DATA_SIZE__
ldx #>__DATA_SIZE__
jsr _memcpy
jsr initlib
; Push arguments and call main
;ra:
; inc $D021
; jmp ra
jsr _main
; Back from main (This is also the _exit entry). Run module destructors
_exit: jsr donelib
; Reset the IRQ vector if we chained it.
; ;pha ; Save the return code on stack
; lda #<__INTERRUPTOR_COUNT__
; beq NoIRQ2
; lda IRQInd+1
; ldx IRQInd+2
; sei
; sta IRQVec
; stx IRQVec+1
; cli
NoIRQ2:
jmp startup
--------------------
If you want, I can post my version of printf().
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