MIDIbox

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This is a raw version of the HowTo - don't let that scare you though :D

===============================================================================
FILE: app_defines.h
===============================================================================

* find a free spot in the ram like

;; free: 0x6d..0x79

* add the variable to store the layer

CS_MENU_LAYER 		EQU	0x06d	; stores the active layer

* and possibly change the comment to match the new situation

;; free: 0x6e..0x79

===============================================================================
FILE: setup_*.asm:
===============================================================================
* in the CS_MENU_DIN_TABLE add the new buttons (SR + Pin might not match)

	DIN_ENTRY	CS_MENU_BUTTON_Layer1,		2,	 7
	DIN_ENTRY	CS_MENU_BUTTON_Layer2,		1,	 4
	DIN_ENTRY	CS_MENU_BUTTON_Layer3,		1,	 5
	DIN_ENTRY	CS_MENU_BUTTON_Layer4,		1,	 6
	DIN_ENTRY	CS_MENU_BUTTON_Layer5,		1,	 7
	DIN_ENTRY	CS_MENU_BUTTON_Layer6,		1,	 3

* in the CS_MENU_DOUT_TABLE add the layer LEDs (SR + Pin might not match)

	DOUT_ENTRY	TMP3, 0,			1,  0	; Layer 1 LED  
	DOUT_ENTRY	TMP3, 1,			1,  1	; Layer 2 LED  
	DOUT_ENTRY	TMP3, 2,			1,  2	; Layer 3 LED  
	DOUT_ENTRY	TMP3, 3,			1,  3	; Layer 4 LED  
	DOUT_ENTRY	TMP3, 4,			1,  4	; Layer 5 LED  
	DOUT_ENTRY	TMP3, 5,			1,  5	; Layer 6 LED  	

===============================================================================
FILE: cs_menu_buttons.inc:
===============================================================================
* after 

	;; --------------------------------------------------------------------------
	;; the button functions are defined here
	;; --------------------------------------------------------------------------
	
* add the button handlers for the layer buttons

	CS_MENU_BUTTON_Layer1
	CS_MENU_BUTTON_Layer2
	CS_MENU_BUTTON_Layer3
	CS_MENU_BUTTON_Layer4
	CS_MENU_BUTTON_Layer5
	CS_MENU_BUTTON_Layer6

* now it should compile and run, but not do anything ;-)	
* each of those "functions" handles the button presses for one layer button

* For example, the "Oscillator Layer" handler
	
CS_MENU_BUTTON_Layer2 ;; OSC 1 Layer
	;; do nothing if button has been depressed
	btfsc	MIOS_PARAMETER2, 0 					;; check if button has been released
	return										;; if so exit
	;; open the menu
	call	CS_MENU_GetMenuID_OSC				;; goto OSC menu page
	call	CS_MENU_BUTTON_Hlp_MenuChangeOk		;; propagate menu change
	;; store the active layer
	movlw	0x02								;; put 2 (layer number) on the WREG
	movwf	CS_MENU_LAYER						;; and write it to the variable
	return										;; done
	
* if you only use the predefined menus, this is all there is to do for each layer.
* I added a special menu for Filter and LFO, this requires some more work:

===============================================================================
FILE: cs_menu_tables.inc:
===============================================================================
* in CS_MENU_TABLES_IDS add another row like this:	

	db	CS_MENU_L_FL,  CS_MENU_ROOT,  CS_MENU_ROOT,  CS_MENU_ROOT
	
* CS_MENU_L_FL is the new [F]ilter+[L]fo menu
* in CS_MENU_TABLES_L add a new row like this:

	CS_MENU_T_ENTRY	CS_MENU_TABLE_L_FL, CS_MENU_Page_Parameters, CS_MENU_EXEC_GoToRoot, "F/L", 0, 0x00, PRINT_NOP
	
* right after that table there's a list of the menu IDs. To add our new menu add a line like this:

CS_MENU_L_FL 	EQU	0x0f	

* now we want to add the menu to the menu structure. To do so you need to find CS_MENU_TABLE_L_ROOT, the "root table"
* I wanted to have the new menu between the LFO and Envelope menus, so I put it between those two:

	CS_MENU_ENTRY	CS_MENU_L_LFO,             "LFO",  0x000, PRINT_NOP,        EXEC_MENU,       R2PP2R_NOP
	CS_MENU_ENTRY	CS_MENU_L_ENV,             "ENV",  0x000, PRINT_NOP,        EXEC_MENU,       R2PP2R_NOP

* resulting in this:

	CS_MENU_ENTRY	CS_MENU_L_LFO,             "LFO",  0x000, PRINT_NOP,        EXEC_MENU,       R2PP2R_NOP
	CS_MENU_ENTRY	CS_MENU_L_FL,	           "F/L",  0x000, PRINT_NOP,        EXEC_MENU,       R2PP2R_NOP
	CS_MENU_ENTRY	CS_MENU_L_ENV,             "ENV",  0x000, PRINT_NOP,        EXEC_MENU,       R2PP2R_NOP
	
* note that you can change the order of the menu items as you wish.
* Now we're still missing the actual menu :D
* At the end of the file insert something like this:

; ==========================================================================
;  The combined FIL/LFO menu
;

 ==========================================================================
CS_MENU_TABLE_L_FL 
	db	(CS_MENU_TABLE_L_FL_End-CS_MENU_TABLE_L_FL)/CS_MENU_ENTRY_LEN, 0x00

	;;              Register (00=dummy)         |<->|  max   print ix          exec ix          parameter transfer
	CS_MENU_ENTRY	SID_Ix_L_Fx_CUTOFF_L,       "Cut", 0xfff, PRINT_Fx_CUTOFF,  EXEC_SELPAR,     R2PP2R_Fx_CUTOFF
	CS_MENU_ENTRY	SID_Ix_L_Fx_RESONANCE,      "Res", 0x0ff, PRINT_Fx_RESON,   EXEC_SELPAR,     R2PP2R_Fx_RESON
	CS_MENU_ENTRY	0x00,                       "   ", 0x000, PRINT_NOP,	    EXEC_NOP,        R2PP2R_NOP
	CS_MENU_ENTRY	SID_Ix_LFOx_RATE,           "Rte", 0x0ff, PRINT_LFOx_RATE,  EXEC_SELPAR,     R2PP2R_LFOx
	CS_MENU_ENTRY	SID_Ix_LFOx_DEPTH,          "Dep", 0x0ff, PRINT_LFOx_PMDEC8,EXEC_SELPAR,     R2PP2R_LFOx
CS_MENU_TABLE_L_FL_End
	
* this menu page has 5 entries, the third one being an empty dummy entry
* Now the menu is done :-)
* to make one layer button open this menu all we need to do is change the handler above to call this page
* in this case that would look like this:

CS_MENU_BUTTON_Layer5 ;; FILTER/LFO LAYER
	;; do nothing if button has been depressed
	btfsc	MIOS_PARAMETER2, 0
	return
	movlw	0x10
	movwf	CS_MENU_LAYER
	call	CS_MENU_GetMenuID_FL	; goto FILTER/LFO menu page
	goto 	CS_MENU_BUTTON_Hlp_MenuChange
	return

=== One last thing to edit ===
The CS_MENU_GetMenuID_FL function, which returns the ID of the menu page needs to be defined. This should be done in cs_menu.inc in the section titled
<code>;; --------------------------------------------------------------------------
;;  This function returns the CS_MENU_x_xxx ID depending on selected engine
;; --------------------------------------------------------------------------</code>
which is around line 2056.
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