CH32V examples and bootloader question

PlatformIO IDE
11

Ok, update:

  1. I can now build the CH32V003 IAP bootloader example and upload it via wlink to system flash :slight_smile:
  2. adding the below 2 lines to platformio.ini allows to build for address 0x00 but upload to system flash
   upload_protocol = custom
   upload_command = wlink flash $SOURCE --address 0x1FFFF000
  1. after optimizing the example a bit I could add a mode indication by LED (fast blinking). The APP example blinks the same pin slowly. That way I always know which code is actually running
  2. then I seemingly bricked the device:
    • while playing around with the IAP example I commented the USART code and the mode switching. I figured I can always flash via debug interface
    • switching to IAP mode worked as expected (LED blinks fast), but now WCH-LinkE can no longer connect (Error: WCH-Link underlying protocol error: 55 [01]). Power off/on also has no effect, device remains in IAP mode. And since mode switching is commented, I cannot exit IAP mode

To my understanding that means:

  • boot mode information is indeed stored in flash (see initial post). Else information would be lost after power off
  • debug not possibly in IAP mode indicates that on µC side debug seems to be via code included in normal applications, which is omitted in IAP example. Is this why a special linker file is required? Or is there another information why the debugger can connect in APP mode, but not in IAP mode?

PS: any idea if/how I can recover my device? I don’t mind the 10ct, but replacing the µC is a pain

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