Casio CZ/ VZ/ FZ - Pro Series

Jose,

Can you explain the -= in C, is that subtraction?

It seems your routine is very similar to mine save for the 'twos complement' section - but if you are subtracting rather than adding,perhaps that accounts for it.
I do not know what the VZ checksum should be anyhow - only yamahas.

Is the VZ summing all nybbles and then anding with 7f,or is there something more? 




________________________________
 From: José Ángel Morente <msxjam@...>
To: CZsynth@yahoogroups.com 
Sent: Wednesday, 29 January 2014, 16:18
Subject: Re: [CZsynth] VZ SysEx Format
 


  
Some time ago I posted a C program used to convert from VZ1 to standard SYX files. You may take a look at the checksum routine, maybe it can be helpful:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define TONES_NO  64;

typedef unsigned char byte;

int main (int argc,char *argv[])
{
        char *inputfilestream;
        char *outputfilestream;
        FILE *inputfile;
        FILE *outputfile;

        byte tonebuf[336];
        byte operbuf[100];

    byte syxopen[8]={
        0xf0, 0x44, 0x03, 0x00, 0x70, 0x70, 0x02, 0xf7
    };
    byte syxdata[6]={
        0xf0, 0x44, 0x03, 0x00, 0x70, 0x74
    };
    byte syxclose[7]={
        0xf0, 0x44, 0x03, 0x00, 0x70, 0x71, 0xf7
    };

    int i,j,checksum=0;

        byte buffer[10];

        if (argc >= 2) {

                inputfilestream = argv[1];
                if (argc > 2) {
            outputfilestream = argv[2];
                } else {
            outputfilestream = malloc(255);
            strcpy(outputfilestream,inputfilestream);
            outputfilestream = strcat(outputfilestream,".syx");
                }

                inputfile = fopen(inputfilestream,"rb");
                outputfile = fopen(outputfilestream, "wb");

        //write OPEN and DATA sysx messages
        fwrite(syxopen,sizeof(syxopen),1,outputfile);
        fwrite(syxdata,sizeof(syxdata),1,outputfile);

        //process the patches
        for (i=0;i<64;i++) {
            fread(tonebuf,sizeof(tonebuf),1,inputfile);
            checksum = 0;
            for (j=0;j<sizeof(tonebuf);j++) {
                //update the checksum
                checksum -= tonebuf[j];

                buffer[1] = tonebuf[j] & 0x0f;
                buffer[0] = tonebuf[j] >> 4;
                fwrite(buffer,2,1,outputfile);
            }
            //ignores the bit 7
            checksum &= 0x7f;
            fwrite(&checksum,1,1,outputfile);

        }
        //process the operations
        for (i=0;i<64;i++) {
            fread(operbuf,sizeof(operbuf),1,inputfile);
            checksum = 0;
            for (j=0;j<sizeof(operbuf);j++) {
                //update the checksum
                checksum -= operbuf[j];

                buffer[1] = operbuf[j] & 0x0f;
                buffer[0] = operbuf[j] >> 4;
                fwrite(buffer,2,1,outputfile);
            }
            //ignores the bit 7
            checksum &= 0x7f;
            fwrite(&checksum,1,1,outputfile);

        }

        buffer[0] = 0xf7;
        fwrite(buffer,1,1,outputfile);
        fwrite(syxclose,sizeof(syxclose),1,outputfile);


                fclose(inputfile);
                fclose(outputfile);
        }
        return 0;
}





--



On Sun, Jan 5, 2014 at 10:23 PM, <facebook@cain-project.com> wrote:

 
>  
>Happy new year to all,
>
>
>I spent some time during the holidays setting up an smal HTML5 based framework which is intented to act as a librarian for the VZ sound patches. 
>
>
>Going through the specs I came over the checksum, which isn't described in detail in the CasioVZ-HohnerHS Sysex Format.pdf.
>
>
>Can anyone help me out on the details here?
>
>
>My idea:
>Create a little helper to rearrange existing sysex files, which will (in the first step) be consolidated in a new sysex file to be uploaded.
>
>
>
>My progress:
>So far I can drag and drop sysex files into the GUI and extract the tone and op names of the banks, also a re-arrangement is possible (from gui side).
>
>
>My need:
>Any help on the internal sysex format - especially on the check sum.
>
>
>Technology: 
>HTML5 so anyone could use it. Upload to the VZ would still need an external tool but maybe HTML5 will support that, too in the future.
>
>
>Me:
>I have a VZ10m, HS-2, CZ-3000 and an HT-3000 in my set-up (besides D-110, X3R, AN1x, Phm and sonic|core Scope 5)
>
>
>Any help is appreciated,
>
>
>cheers,
>
>
>Pete
>
>
>(I was in the forum before but lot my ID after a computer crash ;) )
>
>