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bigtreetech / BIGTREETECH-SKR-mini-E3

BIGTREETECH SKR-mini-E3 motherboard is a ultra-quiet, low-power, high-quality 3D printing machine control board. It is launched by the 3D printing team of Shenzhen BIGTREE technology co., LTD. This board is specially tailored for Ender 3 printer, perfectly replacing the original Ender3 printer motherboard.
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[Question] Why using STM32F103RC_bigtree_NOUSB with SKR-MINI-E3 V1.2 ? #124

Open kramer04 opened 4 years ago

kramer04 commented 4 years ago

on last readme tells "If you are using the official Marlin 2.0 version, you need the following additional changes to change the default environment from megaatmega2560 to STM32F103RC_bigtree_NOUSB, env_default = STM32F103RC_bigtree_NOUSB"

This motherboard has an usb port; so i don't understand Can someone explains this Thanks

x0rzist commented 4 years ago

NOUSB refers to not using USB composite (link). This feature is for direct access to the SD card from the host. I think they disabled it because it uses quite a bit of PROGMEM.

It is normally not needed for normal operation but I use it to update the firmware via octoprint.

thebest07111 commented 4 years ago

But can you still use octoprint with usb connection? but just not flash with it so you need an sd card to flash?

x0rzist commented 4 years ago

Yes, octoprint works normally even without USB composite, I use the environment STM32F103RC_bigtree_512K, where you can use more PROGMEM and USB composite is enabled.

thebest07111 commented 4 years ago

Yes, octoprint works normally even without USB composite, I use the environment STM32F103RC_bigtree_512K, where you can use more PROGMEM and USB composite is enabled.

But for the 521K dont you need the 512K board?

x0rzist commented 4 years ago

Somebody on Reddit recently found out that the chip STM32F103RCT6 has in reality 512k flash instead of the official 256k. While not officially supported, it's working without problems for me.

kramer04 commented 4 years ago

so i use STM32F103RC_bigtree_512K and it works well and now i've more memory, so good

Sanchowatts commented 4 years ago

Hi everybody... Do you mean STM32F103RC_bigtree_512K_USB or just STM32F103RC_bigtree_512K ?

Thanks