T48: Difference between revisions

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# ground
# ground
# BOOT
# BOOT
#* U5 pin 4
#* SM16306SJ
#* https://www.lcsc.com/product-detail/LED-Drivers_Shenzhen-Sunmoon-Micro-SM16306S_C2830324.html
#* 4 => LE
#* BOOT1?
#* BOOT1?





Revision as of 06:03, 21 December 2022

WCH-link

Debug header

  1. BO
  2. 3V3
    • no 3.3V on PCB. I guess connect to WCH-Link 3V3?
  3. SWDCLK
  4. SWDIO
  5. ground
  6. BOOT


Package pin assignment

  • PA13/SWDIO
  • PA14/SWCLK


boot to high pin => seems to enable USB even with SWD plugged in


Unbrick

In theory we have all firmware (system ROM, bootloader, main firmware) and should be able to unbrick devices. However, I was unable to restore my devices

Theory: unrick issue is firmware is not at correct .hex location. Things that didn't seem to work to get firmware .hex file:

 objcopy --input-target=binary --output-target=ihex --set-start 0x08000000 t48_bootrom_2022-06-30.bin t48_bootrom_2022-06-30.hex
 objcopy --input-target=binary --output-target=ihex --change-addresses 0x08000000 t48_bootrom_2022-06-30.bin t48_bootrom_2022-06-30.hex  
 objcopy --input-target=binary --output-target=ihex t48_bootrom_2022-06-30.bin temp.hex
 objcopy --change-addresses 0x08000000 temp.hex t48_bootrom_2022-06-30.hex