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openwch / arduino_core_ch32

Core library for CH32duino
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Programming without LinkE? #134

Open thor171 opened 2 weeks ago

thor171 commented 2 weeks ago

Hi, I'm new to the CH32x035. I made a pcb for testing purposes and I'm wondering, how to program it using it's USB interface. The datasheet says: "Built-in 3328B System memory (Bootloader) for storing the system bootloader (Factory-cured bootloader)." Does "Factory-cured" mean, there is already a bootloader flashed by default? If that's the case, is it possible to flash the device without the need for a LinkE? Anyways, a little bit more documentation on the programming process in general would be great, I couldn't find much.

maxgerhardt commented 1 week ago

Exactly, the chip has a USB bootloader. Some good info can e.g. be found in https://github.com/wagiminator/CH32X035-USB-PD-Tester?tab=readme-ov-file#compiling-and-uploading-the-firmware-linux.

Specifically: Bootloader must be entered by pulling the "UDP" / PC17 HIGH at boot, then releasing it, plus the hardware connections you need for the USB plug, etc. The tool wchisp can flash it then. As can the official WCHISPTool.

vimalb commented 1 week ago

I think we're all anxious for another release to be cut - there are some awesome new features including tinyusb and wchisp integration: https://github.com/openwch/arduino_core_ch32/pull/129

You can test them out main branch if you'd like - credit to @hathach for submitting relevant MRs