How do I set an ATTiny85 to 8MHz (internal)?
In the ArduinoIDE there was a menu option to choose from but how do I do that in PlatformIO?
Btw setting this in the .ini only tells the compiler how fast the chip is but will not change the speed of the MCU:
; change MCU frequency
board_build.f_cpu = 80000000L
Thanks
Calculate the fuses for your config, then you can write them in the platformio.ini and program them accordingly (pio run -t fuses). You can also use external programs for this like BitBurner.
Ok, I’ve calculated the fuses and put this into the .ini
[env:custom_fuses]
platform = atmelavr
board = attiny85
framework = arduino
board_fuses.lfuse = 0xE2
board_fuses.hfuse = 0xDF
board_fuses.efuse = 0xFF
this is the output. I doesn’t seem to set the fuses:
Processing custom_fuses (platform: atmelavr; board: attiny85; framework: arduino)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/attiny85.html
PLATFORM: Atmel AVR 2.2.0 > Generic ATtiny85
HARDWARE: ATTINY85 8MHz, 512B RAM, 8KB Flash
DEBUG: Current (simavr) On-board (simavr)
PACKAGES:
- framework-arduino-avr-attiny 1.3.2
- tool-avrdude 1.60300.200527 (6.3.0)
- toolchain-atmelavr 1.50400.190710 (5.4.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 9 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Compiling .pio\build\custom_fuses\src\main.cpp.o
Archiving .pio\build\custom_fuses\libFrameworkArduinoVariant.a
Compiling .pio\build\custom_fuses\FrameworkArduino\HardwareSerial.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\Print.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\Stream.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\TinySoftwareSerial.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\Tone.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\WInterrupts.c.o
Compiling .pio\build\custom_fuses\FrameworkArduino\WMath.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\WString.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\abi.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\main.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\new.cpp.o
Compiling .pio\build\custom_fuses\FrameworkArduino\wiring.c.o
Compiling .pio\build\custom_fuses\FrameworkArduino\wiring_analog.c.o
Compiling .pio\build\custom_fuses\FrameworkArduino\wiring_digital.c.o
Compiling .pio\build\custom_fuses\FrameworkArduino\wiring_pulse.c.o
Compiling .pio\build\custom_fuses\FrameworkArduino\wiring_shift.c.o
Archiving .pio\build\custom_fuses\libFrameworkArduino.a
Linking .pio\build\custom_fuses\firmware.elf
Building .pio\build\custom_fuses\firmware.hex
Checking size .pio\build\custom_fuses\firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM: [== ] 16.6% (used 85 bytes from 512 bytes)
Flash: [== ] 16.2% (used 1326 bytes from 8192 bytes)
Configuring upload protocol...
AVAILABLE: usbtiny
CURRENT: upload_protocol = usbtiny
Looking for upload port...
Uploading .pio\build\custom_fuses\firmware.hex
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e930b (probably t85)
avrdude: erasing chip
avrdude: reading input file ".pio\build\custom_fuses\firmware.hex"
avrdude: writing flash (1326 bytes):
Writing | ################################################## | 100% 2.29s
avrdude: 1326 bytes of flash written
avrdude: verifying flash memory against .pio\build\custom_fuses\firmware.hex:
avrdude: load data flash data from input file .pio\build\custom_fuses\firmware.hex:
avrdude: input file .pio\build\custom_fuses\firmware.hex contains 1326 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 2.57s
avrdude: verifying ...
avrdude: 1326 bytes of flash verified
avrdude: safemode: Fuses OK (E:FF, H:DF, L:62)
avrdude done. Thank you.
```This looks to me as if you have pressed the “Upload” button instead of executing the “Set Fuses” task or pio run -t fuses as shown above.
You should get something like
$ pio run -t fuses
Processing custom_fuses (platform: atmelavr; board: attiny85; framework: arduino)
------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/attiny85.html
PLATFORM: Atmel AVR 2.2.0 > Generic ATtiny85
HARDWARE: ATTINY85 8MHz, 512B RAM, 8KB Flash
DEBUG: Current (simavr) On-board (simavr)
PACKAGES:
- framework-arduino-avr-attiny 1.3.2
- tool-avrdude 1.60300.200527 (6.3.0)
- toolchain-atmelavr 1.50400.190710 (5.4.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 11 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Selected fuses: [lfuse = 0xE2, hfuse = 0xDF, efuse = 0xFF]
Setting fuses
...
I wasn’t aware that there is something like project tasks.
Now it works - thanks for helping me out!
Bonus question: now I have to environs in my ini and when I press upload two tasks are run consecutive.
Do I have to delete the fuse part or is there a better way?
In your case you should really just have one environment which has the correct board and fuses – doesn’t make sense to have one without and one with. So just copy the
board_fuses.lfuse = 0xE2
board_fuses.hfuse = 0xDF
board_fuses.efuse = 0xFF
in your main env and work with that.
On a side note you can use the documented default_envs command to select a default environment (or more) if you ever have two or more.
[platformio]
default_envs = attiny85
[env:attiny85]
platform = atmelavr
board = attiny85
framework = arduino
board_fuses.lfuse = 0xE2
board_fuses.hfuse = 0xDF
board_fuses.efuse = 0xFF
[env:some_other_cool_env]
board = ..
Also as the docs show each own environment has its own submenu so you can always execute specific tasks (build, upload, fuses…) on that environment through that menu.
Thanks for that thorough answer!