https://www.m-vave.com/productinfo/1431195.html
The M-VAVE SMK-37 PRO is a MIDI keyboard (controller) with a built-in DX7 compatible FM tone generator.
It would be so much more valuable if the firmware would be open source for the community to modify and improve.
Please give information how we can customize firmware. You will sell more. Thanks!
The firmware update file has the extension .fwsc and contains strings that make it seem probable that it uses a scheme similar or identical to what is described in https://kagaimiq.github.io/jielie/datafmt/newfw.html
So possibly a chip by JieLi Technology is used: https://kagaimiq.github.io/jielie/chips/ is used.
https://github.com/kagaimiq/jielie contains useful information.
git clone https://github.com/kagaimiq/jl-misctools
python3 -m pip install crcmod
python3 jl-misctools/firmware/fwunpack_newfw.py /mnt/c/Users/User/Downloads/*fwsc
#
# /mnt/c/Users/User/Downloads/SMK-37 Pro_012.fwsc
#
--- UFW file ---
chip name: "AC791N"
Firmware base is at @0
Burner size....: 544
VID............: b'0.01'
Flash size.....: $0FF000
FS version.....: 16
Block alignment: 16
Special option.: $FF
PID............: b'AC791N_STORY\xff\xff\xff\xff'
(top) <JLFS Entry @00000020 - 71C8 @000000A0/000000A0 ( 14384/ 14384) - 00/00 / 0 -- "uboot.boot">
(top) <JLFS Entry @00000040 - 70D5 @000038D0/000038D0 ( 699/ 699) - 02/80 / 0 -- "isd_config.ini">
Firmware chipkey from isd_config.ini: 980F
(top) <JLFS Entry @00000060 - FFFF @00004000/00004000 (4294967295/4294967295) - 81/FF / 0 -- "app_dir_head">
(top) <JLFS Entry @00000080 - FFFF @000FF000/000FF000 ( 4096/ 4096) - 12/01 / 65535 -- "key_mac">
Using chipkey: $980F
(App Area Head) <JLFS Entry @00004000 - BC2A @02000120/00004020 ( 616499/ 616467) - 83/FF / 0 -- "app_area_head">
Entry point address: 0x2000120
(App) <JLFS Entry @00004020 - CB2D @00000120/00004120 ( 615828/ 615828) - 82/FF / 0 -- "app.bin">
(App) <JLFS Entry @00004040 - 2E75 @000966B4/0009A6B4 ( 383/ 383) - 82/FF / 0 -- "cfg_tool.bin">
(App) <JLFS Entry @00004060 - FFFF @0009C000/000A0000 ( 147456/ 147456) - 12/81 / 0 -- "VM">
(App) <JLFS Entry @00004080 - FFFF @00000000/00004000 ( 638976/ 638976) - 92/82 / 0 -- "PRCT">
(App) <JLFS Entry @000040A0 - FFFF @000C0000/000C4000 ( 4096/ 4096) - 92/82 / 0 -- "BTIF">
(App) <JLFS Entry @000040C0 - FFFF @000C1000/000C5000 ( 4096/ 4096) - 92/81 / 0 -- "USRTRIM">
(App) <JLFS Entry @000040E0 - FFFF @000C2000/000C6000 ( 167936/ 167936) - 92/81 / 0 -- "USRFLASH">
(App) <JLFS Entry @00004100 - FFFF @000F4000/000F8000 ( 40960/ 40960) - 92/81 / 1 -- "USR">
(Res) <JLFS Entry @0009A833 - ABBD @00000020/0009A853 ( 2937/ 2905) - 83/FF / 1 -- "cfg">
====> <JLFS Entry @0009A853 - 017D @00000040/0009A873 ( 2873/ 2873) - 82/FF / 1 -- "eq_cfg_hw.bin">
Strings like btstack_lowpwer_deal possibly suggest https://github.com/Jieli-Tech/fw-AC63_BT_SDK/ (or similar) being used?
Possbly JL_AC79_DevKit V1.0 is the development environment?
https://doc.zh-jieli.com/AC79/zh-cn/master/board_description/board_overview/index.html
Disassembled my SMK37 Pro after seeing this post and found the main chip to be marked with JL aka Jie Li "C108221-11B8" in a LQFP48 package. Basic search for "C108221" on the site of the manufacture in the documentation center suggests that you are right to assume the chip family AC63. However, I was not able to find a datasheet or confirm the markings vs packages and model. Some other chips seem to be flash and perhaps power management. I attach some picture for posterity.
