The topic Pure AVR Assembler programming discusses methods for programming an ATTiny85 using an external programmer and no arduino framework (AVR assembly). USBTinyIsp is also supported per Atmel AVR — PlatformIO latest documentation.
The topic Pure AVR Assembler programming discusses methods for programming an ATTiny85 using an external programmer and no arduino framework (AVR assembly). USBTinyIsp is also supported per Atmel AVR — PlatformIO latest documentation.