Hello every one,
I juste purchased an Arduino UNO R4 Minima, and I am wondering why TX and RX LEDs on the board are not blinking when Serial transmission is on?
On my Arduino UNO R3 board, they worked very fine, but not on my R4 Minima.
I tested the two LED with the following Sketch on my UNO R4 Minima, and they worked:
So, I concluded that it is not a LED problem.
Could anyone tell me if these two LEDs are supposed to blink when transmitting Serial data via USB cable?
Thank you in advance
The Minima uses native USB. You won't see the Tx-Rx lights.
I think it would be possible to use an event link to turn the pin on whenever the transmit register gets loaded, but I don't know that it would be easy.
On the R4 the ESP32 serves as a serial bridge and the Tx-Rx lights on it work like they do on the R3.
Thank you a lot for your answers.
Could you explain to me what is the meaning of "native USB"?
Why do TX and RX LEDs blink on UNO R3 board, and not on UNO R4 Minima board? (they both communicate with the PC using USB cable)?
... simply because whoever developed the driver for the ATmega16U2, which is present on the Arduino UNO R3 as a USB <-> Serial converter, spent time developing support for handling the two LEDs (just look in the firmware sources to find it all in the files Arduino-usbserial.c and Arduino-usbserial.h), while the same thing was NOT done by whoever developed the USB part of the Arduino UNO R4.