Wio Terminal Grove UART

grove_left_uart.ino

#include <wiring_private.h>

static Uart Serial3(&sercom3, PIN_WIRE_SCL, PIN_WIRE_SDA, SERCOM_RX_PAD_1, UART_TX_PAD_0);

void setup() {
    Serial.begin(115200);
    while(!Serial);

    Serial3.begin(115200);
    pinPeripheral(PIN_WIRE_SCL, PIO_SERCOM_ALT);
    pinPeripheral(PIN_WIRE_SDA, PIO_SERCOM_ALT);
}

void loop() {
    Serial3.println("test");
    delay(1000);
}


void SERCOM3_0_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM3_1_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM3_2_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM3_3_Handler()
{
  Serial3.IrqHandler();
}

grove_right_uart.ino

#include <wiring_private.h>

// GROVE right port
// This disables internal I2C port, which is connected to internal 3-axis accelerometer
static Uart Serial3(&sercom4, D1, D0, SERCOM_RX_PAD_1, UART_TX_PAD_0);

void setup() {
    Serial.begin(115200);
    while(!Serial);

    Serial3.begin(115200);
    pinPeripheral(D0, PIO_SERCOM_ALT);
    pinPeripheral(D1, PIO_SERCOM_ALT);
}
void loop() {
    Serial3.println("test");
    delay(1000);
}


void SERCOM4_0_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM4_1_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM4_2_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM4_3_Handler()
{
  Serial3.IrqHandler();
}

Hi

try swapping the RX and TX signals (I changed the white and yellow cables in the connector)... I'm still investigating the reason (I've an idea about it but asked for confirmation to Seeed support) but it worked for me

Hi Luca, I'll give it a try for sure !

Thanks for your interest, I didn't know you're "frequenting" wio terminal too !!!
I've followed your (SUPERB) work on RPi about green pass reading, really well done, thank you also for that !

(btw, I'm italian too)

;) grazie! I received a test unit from Seeed and I found your same issue. BTW I received a first message from the support and they seem to confirm my idea (pins swapped)