F4į4 flight controllers were introduced shortly after the F3, and quickly gained popularity due to its processing power advantage. It’s actually determined by a separate memory chip on the flight controller. Note the size of flash data storage used for Blackbox logging doesn’t depend on the processor. Some F3 chips are almost pin-to-pin compatible with the STM32 F1 chip used on most F1 FC, in fact someone commented on my blog, that he successfully replaced the F1 chip with an F3 on his CC3D, and is now running 8K looptime on it (thanks to the SPI Gyro used on this FC). All UART’s on an F3 processor have native inversion, which means you can run SBUS and Smart Port directly without doing any “un-inversion hacks”. Effectively this means that an F1 board has only 1 UART for additional hardware, whereas an F3 board can usually utilize all 3 UART’s for extra devices F1 users have to avoid connecting any peripherals to UART1 in order to retain this slot for PC connection. In addition, and possibly more importantly, the newer F3 boards provide a dedicated UART for the USB port (VCP).
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