If you are on Windows then this directory can be found in your “C:/Users//AppData/Local” profile directory.įind the two lines that say the following: #define HWSERIAL2_MUX (PORTMUX_USART0_NONE_gc) arduino15/packages/arduino/hardware/megaavr/1.8.5/variants/nona4809/pins_arduino.h To enable access to the additional two serial ports requires the following change to the following file. There is a discussion about what is required in this thread on the official Arduino forums: “Arduino Nano EVERY access to 4 Serial”. It turns out that the official Arduino megaAVR core that supports the Arduino Nano Every has all the code required to support four serial ports present, it just isn’t enabled. The upshot of all this is that all the serial ports are available on pins that are broken out on the Nano Every, although UART3 is configured for its “alternative function” configuration which is connected to the USB interface, not to D9/D10. The full listing of Arduino pins to serial port function to ATmega4809 pins is given below. UART 0 uses PORTA UART 1 uses PORTC UART 2 uses PORTF and UART 3 uses PORTB. The general pattern is that four of the ATmega4809 ports support a UART with TX/RX on Px0/Px1 respectively, with the “ALT 1” alternate pin mapping on Px4/Px5. (10) is reserved for future use in each case. There are two bits in the USARTROUTEA register for each of the serial ports to select between “Default” (00), “ALT 1” (01), and “None” (11). The PORTMUX register itself is detailed in the table in section 15.2: “Register Summary – PORTMUX”. The full list of functions for each pin is detailed in the table in section 4.1. Many of the IO pins carry alternative functions which are selected using the built-in multiplexer configuration which is all detailed in section 4 of the ATmega4809 datasheet: “4. In the case of UART2 this is via the first “alternative function” mapping of the IO pins. These are mapped onto the ATmega4809 MCU as follows:Īs you might now be thinking, what happened to UART 2? Well there are indeed four UARTs on the ATmega4809, so UART 0 and 2 pop out on the following IO pins: Having now introduced the Arduino Nano Every in my previous post, this time I thought I’d turn to the additional serial ports.Īs I mentioned last time, the “out of the box” Arduino experience for the Nano Every has Serial attached to the USB serial line and Serial 1 representing the hardware UART on D0/D1.
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