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This page will contain all of the information about the Coresound synth

link to forum topic: http://www.midibox.org/forum/index.php?topic=8150.0

====== Introduction ======
Coresound is a digital synthesiser module based on the midibox platform.\\
todo: add more info

====== Features ======
  * Digital synthesiser for microchip pic microcontrollers
  * 24 bit phase accumulator for frequency control
  * wavetable signal generation
  * waveshaper with 3 modes: hardclip, softclip and foldover
  * 16 bit digital filter
  * uses a modified [[midibox_sid]] engine for control/modulation

====== Software ======

===== v0.1 =====
This version uses a lfo, cc and env code from mb_sid v1.7\\
the dco is a wavetable oscillator based on the Wiard Wavecity ROM

===== v0.2 =====
From v0.2 the modulation/control/cs will be seperated from the actual sound generation\\
The data exchangement method is not decided yet, MBNET seems the best choice right now\\
see this forum topic for more information: http://www.midibox.org/forum/index.php?topic=8328.0\\
The sound unit registers will be refreshed each time the control routine is executed (f = 1kHz)

==== Control unit ====
The control unit will be based on the midibox sid engine\\
but will be adapted to control the sound unit parameters.

==== Sound unit ====
The first tests will be done with the wavetable dco from v0.1,\\
after this works alternate dco implementations will be tried

Register specification:\\ 
  * Satus register:
    * Status: 1 byte
  * DCO registers:
    * Pitch: 3 bytes
    * Waveform: 1 byte
    * Interpolation: 1 byte
    * Phase: 1 byte
    * Free: 2nd oscillator: 6 bytes
  * Waveshaper registers:
    * Mode: 1 byte
    * Type: 1 byte
  * DCF registers:
    * Cutoff: 1 byte
    * Resonance: 1 byte
    * Filter type: 1 byte
  * DCA registers:
    * Level: 1 byte


==== MBNET ====
My experiences with setting up a MBNET client:
  * Copied MBNET.inc and SID_MBNET.inc from the sid folder to the project directory
  * Renamed the SID_MBNET.inc to CRSND_MBNET.inc, changed all lables inside the file from SID_* to CRSND_*
  * Changed the lables inside MBNET.inc to the new lables
  * Copied the ping info from main.inc to my main .asm file, changed:
<code>
;; MBNET specific definitions (ping reply information - don't touch this!)
#define MBNET_CONST_PROTOCOL_V		1
#define MBNET_CONST_TYPE_C0		'S'
#define MBNET_CONST_TYPE_C1		'I'
#define MBNET_CONST_TYPE_C2		'D'
#define MBNET_CONST_TYPE_C3		' '
#define MBNET_CONST_TYPE_VERSION	1
#define MBNET_CONST_TYPE_SUBVERSION	4685
</code>
into:
<code>
#define MBNET_CONST_PROTOCOL_V		1
#define MBNET_CONST_TYPE_C0		'C'
#define MBNET_CONST_TYPE_C1		'R'
#define MBNET_CONST_TYPE_C2		'S'
#define MBNET_CONST_TYPE_C3		'D'
#define MBNET_CONST_TYPE_VERSION	0
#define MBNET_CONST_TYPE_SUBVERSION	2
</code>

  * Added the variables for MBNET in my app_defines.h:
<code>
MBNET_BASE		EQU	0x600	; used for SET_BSR

MBNET_STATE		EQU	0x600
MBNET_RX_BUFFER_PTR_L	EQU	0x601
MBNET_RX_BUFFER_PTR_H	EQU	0x602
MBNET_MY_ID		EQU	0x603
MBNET_MASTER_ID		EQU	0x604
MBNET_SLAVE_ID		EQU	0x605
MBNET_TOS		EQU	0x606
MBNET_EID_L		EQU	0x607
MBNET_EID_H		EQU	0x608
MBNET_NODE_AVAIL	EQU	0x609
MBNET_NODE_INCOMPATIBLE	EQU	0x60a
MBNET_TIMEOUT_CTR_L	EQU	0x60b
MBNET_TIMEOUT_CTR_H	EQU	0x60c
MBNET_LOOP_CTR		EQU	0x60d
MBNET_RETRY_WAIT_CTR	EQU	0x60e
MBNET_RETRY_NODE	EQU	0x60f

MBNET_RETRY_NODE_CTR_BEGIN EQU	0x610	; ..0x617

MBNET_NODE_INFO_BEGIN	EQU	0x620	; ..0x65f  ; (8*8 bytes)
</code>
  * To be continued :-)

====== Hardware ======

===== v0.1 =====
The hardware of the first version consists of a standard core board 
and a DAC module with a anti-aliasing filter


==== Schematic ====
{{coresound:coresound.jpg?300x*}} click to enlarge \\

==== Connection diagram ====
connection to core:
^coresound pin ^core pin ^pic pin nr ^
|1 	|ground	|-|
|2 	|J15:D7	|40|
|3 	|J15:D6	|39|
|4 	|J15:D5	|38|
|5 	|J15:D4	|37|
|6 	|J15:D3	|36|
|7 	|J15:D2	|35|
|8 	|J15:D1	|34|
|9 	|J15:D0	|33|
|10 	|J14	|-|
|11 	|+5v    |-|

===== v0.x =====
The final version will use two pics, more info will follow

==== Schematic ====
Not available yet

====== Todo ======

====== Suggestions ======
Everybody can add suggestions here...\\
\\
\\


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