To identify the tty device node number in Linux corresponding to a particular hardware uart open a terminal and execute the following command
ls /sys/bus/pci/devices/0000\:00\:18.?/dw-apb-uart.*/tty/ | grep tty
/sys/bus/pci/devices/0000:00:18.0/dw-apb-uart.8/tty/:
ttyS0
/sys/bus/pci/devices/0000:00:18.1/dw-apb-uart.9/tty/:
ttyS1
The first UART (associated to dw-apb-uart.8) is the uart on the M10 connector, and the one associated with dw-apb-uart.9 is the one on the HAT. So to access the uart on the HAT on ubilinux I have to open the device file /devttyS1
sudo screen /dev/ttyS1 115200
Up_Squared pin8 <---------> ublox pin9
Up_Squared pin10 <---------> ublox pin10
import mraa
import time
import sys
# serial port
port = "/dev/ttyS5"
u = mraa.Uart(port)
u.setBaudRate(19200)
u.setMode(8, mraa.UART_PARITY_NONE, 1)
u.setFlowcontrol(False, False)
# Start a neverending loop waiting for data to arrive.
# Press Ctrl+C to get out of it.
while True:
if u.dataAvailable():
# We are doing 1-byte reads here
data = u.readStr(1)
print(data)
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