Simple ESP32 based hdzero flasher.
Wire the ESP32 to the HDZERO Flasher plug:
VTX COLOR ESP32
3.3V RED 3.3V
GND BLACK GND
SPI CS YELLOW GPIO15
SPI CLK GREEN GPIO14
SPI DI BLUE GPIO12
SPI DIO WHITE GPIO13
RTSN_5680 ORANGE GPIO4
Firmware implements the XMODEM protocol. A python script to send data is included.
This progam uses GPIO12 for connecting to the hdzero spi flash. The same pin is used by the ESP32 to determine its internal flash's voltage. To gurantee stable operation you might have to burn the appropiate efuse to force the correct voltage. See this page for more information.