Additional changes regarding program loading

wip-duuqnd/loader.s

@@ -1,13 +1,13 @@
 ;;; -*- Mode: asm; indent-tabs-mode: t; tab-width: 8 -*-
 
-;;This program reads a data stream from the joystick port and saves it in memory.
+;; This program reads a data stream from the joystick port and saves it in memory.
-;;The datastream format is as sutch:
+;; The datastream format is as sutch:
 ;;
-;;############################################
+;; ############################################
-;; 16-bit byte-length (big endian) | data
+;;  16-bit byte-length (big endian) | data
-;;############################################
+;; ############################################
 
-;; The data comes from CTRL2 bit 0 and the clock is at bit 1
+;; The data comes from CTRL1 bit 0 and the clock is at bit 1
 
 ;; The stream starts when the clock is pulled high, after that comes a
 ;; 16-bit big endian number that matches the byte-lenght of the data that will get sent.
@@ -21,41 +21,44 @@
 ;; More documentation on the Joystick port can be found here: https://www.c64-wiki.com/wiki/Joystick
 
 
-	CLKMASK	=	%00000010
+	progdest	=	$fe
-	CTRL2	=	$DC00
+	CLKMASK		=	%00000010
+	CTRL1		=	$DC01
 
 	.org $80d
-coldstart: ;; Draw a dollar sign on screen to show that program has loaded
+coldstart: ;; Draw an at sign on screen to show that program has loaded
 	lda #$0
 	sta $400
-waitstart: ;; Wait until joystick 1 has been pulled forwards to start this program
+	sta progdest
-	lda $dc01
+	lda #$c0
-	and #$01
+	sta progdest+1
+waitstart: ;; Wait until joystick 2 has been pulled down to start the program
+	lda $dc00
+	and #$02
 	bne waitstart
 
-	;; Change boarder colour for debuging
+	;; Change border colour for debugging
-	lda #$00
+	lda #$03
 	sta $d020
 teststart:
 	jsr check_for_load_start ; Check if start_bit is correct
-	bcs @error   ; Idk why C=1 ask john
+	bcs @error   ; The routine sets carry in the event of an error
 	beq teststart
+@doneforever:
 	jmp $c000   ; starts the program?
-	jmp $c000
 @error:
 	lda #1
-	sta $0400 ;lets store 1 att this address for debuging purposes
 	rts
 
 check_for_load_start:
 	lda #CLKMASK
-	bit CTRL2
+	bit CTRL1
-	bne start ; branch if Z ==0 <--> CTRL2 and CLKMASK ==0 <---> CTRL2 bit 2 == 0
+	bne start
 	lda #$00
 	rts
 start:
 	sei
-	;; change boarder collor for debuging purposes
+	;; change border color for debugging purposes
 	ldx #$02
 	stx $d020
 	ldy #$00
@@ -64,13 +67,13 @@ start:
 wait_for_bit_start:
 	lda #CLKMASK
 @loop:
-	bit CTRL2
+	bit CTRL1
 	beq @loop
 
 	lda #CLKMASK
-	bit CTRL2
+	bit CTRL1
 	beq error
-	lda CTRL2
+	lda CTRL1
 
 	lsr
 	ror BYTE
@@ -109,15 +112,19 @@ wait_for_bit_start:
 	jmp done
 @notdone:
 new_byte:
-;; BYTE is the byte beaing read from the stream. The bits are shifted from the left
+;; BYTE is the byte being read from the stream. The bits are shifted from the left
-;; When we shift out this 1 in BYTE bellow we save the BYTE to memory.
+;; When we shift out this 1 in BYTE below we save the BYTE to memory.
 	lda #%10000000
 	sta BYTE
 wait_for_bit_end:
 	lda #CLKMASK
 @loop:
-	bit CTRL2
+	bit CTRL1
 	bne @loop
+	;; Debug show the clock is low
+	lda #$00
+	sta $d020
+
 	jmp wait_for_bit_start
 
 done:
@@ -134,6 +141,5 @@ error:
 
 BYTE		= $400
 LEN		= $402
-progdest	= $fe
 stop:		.word $0000
 loaded:		.byte 0

wip-duuqnd/user-side-compiler/interface.lisp

@@ -222,6 +222,7 @@
               output-filepath))))
 
 (defun send-data-to-c64 (data)
+  (declare (type vector data))
   (with-open-file (stream "/dev/ttyACM0"
                           :direction :io
                           :element-type '(unsigned-byte 8)