PetitModem

Last modified on Apr 03 2018.

File transfer program between Windows PC and SmileBaic on Nintendo 3DS.

Abstract

File Transfer Programs between Windows PC and SmileBasic using sound. Transfer between PC/PC, SmileBasic/SmileBasic is also available. no need for the special cables. File transfer from SmileBasic to PC via Screenshot is also supported.

actual transfer speeds are below:

actual transfer rate on Ver.1.3.0 at 2DS
bit rate	simplex	with ARQ
300	26	20
600	55	42
1200	112	85
2400	225	172

Screen Shot

Environment

PetitModemPC
- .Net Framework 4
- Mic input at least 11025Hz
- Sount output at least 11025Hz
PetitModem3DS
- 3DS/2DS/new3DS
- SmileBasic
silent environment

Specification

PetitModemPC / PetitModem
- 300bps
  - 1080+-100Hz FSK / 1750+-100Hz FSK (ITU-T V.21 corresponding.※)
- 600bps
  - 1500+-200Hz FSK (ITU-T V.23 corresponding※)
- 1200bps
  - 1300+-400Hz FSK (ITU-T V.23 corresponding※)
- 2400bps
  - 1800Hz pi/4 DQPSK (ITU-T V.26bis corresponding※)
- half duplex / simplex
- Synchronous method: start-stop(StartBit:1,StopBit:1)
- Binary transfer protocol: original(YMODEM-like)
  - simplex mode
  - with ARQ(Automatic Repeat reQuest) mode
  - To/From WAV file mode
- Error detection: CRC16(Koopman)
- Charactor set: UCS-4/UTF-8 convert on SmileBasic
- File transfer by screenshot
- compression(LZSSLib)
- error check(koopmanCRC)
LZSS for PetitCom / LZSSLib
- Algorithm:LZSS
- File Format
  - TXT PRG ⇔ PZT
  - BMP PNG JPG ⇔ PZG
  - DAT ⇔ PDA

※follows only on frequency, acuracy of it, modulation method.

Download

Ver. 1.4.1 SHA-1:a34066a84099a0b3a9ff733116bf574aadef269d NJEQK3A4
Ver. 1.4.0 SHA-1:7cc0154ff0ebdaaa3892a42f45ab2bdba054b81b QKE3XX8X
Ver. 1.3.1 SHA-1:0bb0c11701157e2c54ab7aee2cb4278eb157b50a 23DX324V
Ver. 1.3.0 SHA-1:48162564910a45fe8d2981f1ec11e49d5fd68a1c 23DX324V
Ver. 1.2.7 NKX3KE13

the transfer is confirmed only between same version.
PC version contains the code for smilebasic.

License, Charge, Donation

License

This software is free of charge. You can use it personally or commercially. You are also allowed to distribute secondary, fix/alter, do reverse-engineering.

Donation

You can donate via BitCoin / gumroad / PayPal.

BitCoin

Address:16NMv1dX4hNpjvnqvRYgXS4neqHHpa6P3Y

gumroad

PayPal

Reference

Usage

SmileBASIC Tutorials - PetitModem part 1: Usage of this program in English by PetitProfessor3D.

Alternatives

Petitcom 3 QPSK Modulator: by OBONO. QPSK+Hamming code.
P/SEND2 / P/RECV2: by myu314.

Technical

ITU-T V.21: Recommendation of V.21 Modem.
ITU-T V.23: Recommendation of V.23 Modem.
Cyclic Redundancy Code (CRC) Polynomial Selection For Embedded Networks: Optimized CRC polynomial by Philip Koopman, Tridib Chakravarty.
ITU-T V.26bis: Recommendation of V.23 Modem.