Hello everyone. I am using Arduino as ISP to program an Atmega328 U. I have a problem with the oscillator selection, because the fuses are set by default as follows: E: FFh, H: D9h, L: 62h. L = 62h means that I am using the internal oscillator and dividing the frequency by 8, therefore, the micro is working at 1MHz, I would like to modify this lfuse to make L = F0h, that way I select the external oscillator, but I can’t, because Platformio It notifies me that avrdude is using safe mode, so, I can’t change the fuse settings. How can I modify these fuses? Is there any way to disable this safe mode to edit the fuses?
I need to select external oscillator.
This is my platformio.ini configuration:
platform = atmelavr
board = uno
framework = arduino
lib_extra_dirs = ./include
; change microcontroller
board_build.mcu = atmega328
; change MCU frequency
board_fuses.lfuse = 0xF0
board_fuses.hfuse = 0xDE
board_fuses.efuse = 0x05
board_build.f_cpu = 16000000L
;program via ArduinoISP
upload_protocol = custom
upload_port = COM8
upload_speed = 19200
; use “tool-avrdude-megaavr” for the atmelmegaavr platform
upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
After upload code, platformio says:
avrdude: safemode: Fuses OK (E:FF, H:D9, L:62)
so, line “board_fuses.lfuse = 0xF0” is not taking any effect.
I appreciate your attention and help