After flashing the Renesas MCU with the bootloader using the latest version of Renesas Flash Programmer, the serial port still display as RA USB Boot(CDC) and I get No DFU capable USB device available (exit status 74).
I have a Arduino Uno R4 WiFi but I soldered the RA4M1 USB bridge under the board. I have tried both bootloader for the Uno R4 WiFi and Minima and none of the works. In each case I've got operation completed and the flashing is successful when I flash the bootloader.
When the usb port is set directly to the Renesas MCU, should we put the minima bootloader?
Has anyone had success reflashing the bootloader?
My goal is to flash Tasmota on the ESP32S3 of the Arduino Uno R4 WiFi (which works) and communicate with the Renesas chip by having Firmata installed on it and communicate via the shared UART.
ok, I found the solution. There is a unlabeled pin just beside IOREF (boot in the pinout or MD in schematic). When you put a jumper on that pin to ground and reset the board, you end up in RA USB Boot with a VID 0x045B and PID 0x0261. When you put that pin to 5V and reset the board, you end up with the correct minima USB Serial port with VID 0x2341and PID 0x0069.
Thanks for your advice.I've flashed the bootloader successfully, and I could see the dfu usb device. But I can't upload sketch via this port. How should I use this port for programming?
can you tell me more a little bit about your setup? did you solder the bridge under the board? if so, you need the minima boot loader and then you put the boot pin to 5V.
