Technical notes

These are explanetion notes linked from technical reports that collected so as to refer to them directly.

Techinical Notes

• About exFAT file system
• About FAT Filesystem
• Using FONTX font files
• About IR remote control signal in Japan [ja]
• About SPI - Serial Peripheral Interface
• Various video test signals [ja]
• About RS-170A - NTSC video signal standard [ja]
• Using xenon flash valve [ja]
• About PLD [ja]
• JEDEC format fuse map [ja]

Know-How

• AVR: Large clock jitter on recent devices [ja]
• Useful plastic case [ja]
• Using a flat bottom drill [ja]
• AVR: Pseudo DMA
• AVR: Very low cost A-D converter
• AVR: Various use of ISP connector
• How to use an LCD module at 3 volts
• Simple RS-232C interface [ja]
• Extreme wiring on the prototyping board
• Simple power supply for digital circuit [ja]
• Wireing technic on the prototyping board (power line) [ja]
• How to use a radiator fin [ja]

Devices

• Something about HID Lamp [ja]
• Ceramic Capacitor [ja]
• How to Use MMC and SD Card
• How to Use Character LCD Module
• SmartMedia and NAND Flash Memory
• Atmel AVR RISC MCU
• NEC μPD70236 (V53)
• NEC μPD70320/μPD70330 (V25/V35) [ja]
• NEC μPD70325/μPD70335 (V25+/V35+) [ja]
• Thoshiba TMPZ84C015 Integrated Z80 Family MCU [ja]
• Kawasaki Steel KL5C8012 Single-clock Z80
• Toshiba TLCS-47 4-bit MCU [ja]
• Lattice GAL16V8/20V8/22V10 [ja]
• Maxim MAX038 [ja]

Junk Reports

• How to Embed Binary File in Program Code
• Using a Cellular Module
• miniDDS and Something about Interpolation
• IR Gadget (1) [ja]
• Playing with FlashAir and FatFs
• Using tiny LCD module (2) [ja]
• Using tiny LCD module (1)
• Using NXP's small ARM MCUs [ja]
• Invitation to 32-bit world [ja]
• An experiment of ADPCM [ja]
• Using ATM0430D5 color LCD module [ja]
• Blinking LED and Debugging [ja]
• Sample program for RDA5800C FM radio chip
• Using a magazine supplement MCU board (1) [ja]
• Using a magazine supplement MCU board (2) [ja]
• Searching fluorescent materials [ja]
• Using a graphics VFD module [ja]
• Using an LED as an optical detector [ja]
• Gray scale control on HD44780 based LCD modules [ja]
• Using S9894 128x48 dot LCD diaplay module [ja]
• How to use an STN color LCD panel [ja]

AVR assembler libraries for gcc projects

• Getting started for writing asm functions [ja]
• Software UART module (via GPIO port)
• General purpose numeral output module (smaller than printf)
• Fast fixed-point FFT modules (real/complex input, scalar output, 16ms/256pts@16MHz)
• Fast squareroot isqrt32() and ihypot() (only 548 clks for 32bit sqareroot)
• Simple time module (for implementation of UTC based RTC)

AVR assembler libraries

• 8bit x 8bit multiply(signed/unsigned)
• 16bit x 16bit multiply(signed/unsigned)
• 32bit x 32bit multiply(signed/unsigned)
• 8bit / 8bit division(unsigned)
• 16bit / 16bit division(unsigned)
• 24bit / 24bit division(unsigned)
• 32bit / 32bit division(unsigned)
• 16bit fast squareroot
• 32bit fast squareroot
• CRC generation and check
• Binary(8/16bit unsigned) -> decimal string
• Binary(8/16/32bit signed) -> decimal string
• Binary(8/16/32bit) -> hexdecimal string
• Decimal string -> binary (16bit unsigned)
• Decimal string -> binary (32bit signed)
• Hexdecimal string -> binary (32bit)
• Packed BCD -> binary (32bit)
• FIFO control

Tips on the embedded programming and circuit designing

Contact inputs and processing

• Countermeasure to chattering [ja]
• Countermeasure to noise [ja]
• To use a key stroke as a command [ja]
• How to use a rotaly encoder [ja]
• Why pull-up is used? [ja]
• When number of I/O port is not enouph [ja]

Envilonment and building a wab page

• Building web pages
• Photography [ja]
• Home-built Steadicam