https://github.com/tibordp/shiny-avr
USB programmer for ATtiny25/45/85/24/44/84
https://github.com/tibordp/shiny-avr
attiny85 avr-isp openhardware stm32
Last synced: 11 months ago
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USB programmer for ATtiny25/45/85/24/44/84
- Host: GitHub
- URL: https://github.com/tibordp/shiny-avr
- Owner: tibordp
- License: bsd-2-clause
- Created: 2021-01-10T18:17:13.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2021-04-11T13:28:36.000Z (about 5 years ago)
- Last Synced: 2025-07-14T03:59:58.762Z (11 months ago)
- Topics: attiny85, avr-isp, openhardware, stm32
- Language: C++
- Homepage: https://github.com/tibordp/shiny-avr
- Size: 9.37 MB
- Stars: 2
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Shiny AVR Programmer
USB AVR ISP programmer specifically designed for ATtiny25/45/85 and ATtiny24/44/84/241/441/841 microcontroller families in DIP packages.
Blasphemeously designed with an STM32 microcontroller instead of an another AVR.
Shiny AVR programmer provides an 16 MHz clock signal, which allows programming chips that have had their fuse bits set to require an external crystal or clock signal.
# Usage
Insert the ATtiny into the DIP socket on the programmer. Please make sure it is oriented the right way. It should also work for programming the ATtinys in circuit (unless there is circuitry wired to it that would interfere, which is likely, since ATtinys don't have dedicated programming pins), but since there is no standard ISP header on the board, you will need to provide an adapter cable.
Shiny AVR powers ATtinys with 3.3V.
## Arduino
Shiny AVR Programmer will present to the host computer as a virtual USB serial port. It can be used seamlessly from Arduino IDE by
selecting **Tools > Programmer > Arduino as ISP** and selecting the appropriate serial port.
## avrdude
Use `-c arduino` command-line parameter.
## PlatformIO
It requires some modifications to use the [avrdude.conf from ATTinyCore](https://github.com/SpenceKonde/ATTinyCore/blob/master/avr/avrdude.conf) instead of the default one bundled with PlatformIO (`chip_erase_delay` is too low in the stock one).
Example config for ATtiny85
```ini
[env:attiny85]
platform = atmelavr
board = attiny85
upload_protocol = custom
upload_flags =
-C$PROJECT_PACKAGES_DIR/framework-arduino-avr-attiny/avrdude.conf
-p$BOARD_MCU
-P$UPLOAD_PORT
-b$UPLOAD_SPEED
-carduino
upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
upload_port =
upload_speed = 19200
board_build.f_cpu = 16000000L
board_fuses.lfuse = 0xD1
board_fuses.hfuse = 0xDF
board_fuses.efuse = 0xFF
```
Example config for ATtiny84
```ini
[env:attiny84]
platform = atmelavr
board = attiny84
upload_protocol = custom
upload_flags =
-C$PROJECT_PACKAGES_DIR/framework-arduino-avr-attiny/avrdude.conf
-p$BOARD_MCU
-P$UPLOAD_PORT
-b$UPLOAD_SPEED
-carduino
upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
upload_port =
upload_speed = 19200
board_build.f_cpu = 8000000L
board_fuses.lfuse = 0x62
board_fuses.hfuse = 0xDF
board_fuses.efuse = 0xFF
```
# Hardware
The schematic and PCB layout are in the [kicad](./kicad) folder.
# Firmware
Firmware is based on [ArduinoISP](https://github.com/arduino/arduino-examples/blob/main/examples/11.ArduinoISP/ArduinoISP/ArduinoISP.ino) with the
appropriate modifications for the specifics of hardware (LEDs, SPI parameters, ...) and it adds the capability to provide external clock to be able
to program ATtinys that have had their fuses set to rely on external clock or crystal.
# Roadmap
- High voltage programming support for chips `RSTDISBL` or debugWIRE fuse bits set
- Managed power supply or a PTC to prevent damaging the chips
that are inserted upside down in the socket.