Issue with UART Communication from UnitV2 to Raspberry Pi

paramza029

Hello,

I’ve been trying to send simple data from the UnitV2 to the Raspberry Pi using UART on the ttyAMA0 port.

import serial
import time

#  M5Stack UnitV2
uart = serial.Serial('/dev/ttyAMA0', 115200) 

while True:
    uart.write(b'Hello from M5stack\n')
    time.sleep(1)

While the Pi itself can successfully utilize ttyAMA0, the UnitV2 is unable to communicate through this port. Despite updating the firmware as recommended, I still can’t establish communication between the UnitV2 and Pi via UART.


#pi
import serial
import time

try:
    ser = serial.Serial('/dev/ttyAMA0', 115200, timeout=1)  
    print("Serial port opened successfully")
    ser.write(b'Hello from Raspberry Pi!\n')

    while True:
        if ser.in_waiting > 0: 
            data = ser.read(ser.in_waiting).decode('utf-8').strip()
            print(f'Received: {data}')
        time.sleep(1) 
except serial.SerialException as e:
    print(f'Error: {e}')
finally:
    ser.close()

Any advice on how to resolve this?

Thank you for your help.