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#!/usr/bin/env python3
# Test UART controllers, transceivers, adapters and connectors
#
# This is a small autonomous test script to test UART.
# Both ends of the UART communication needs to be connected to the same device.
import argparse
import math
import random
import serial
import serial.rs485
import string
import sys
def randomword(length):
letters = string.ascii_lowercase
return "".join(random.choice(letters) for i in range(length))
def set_rs485_mode(port, enable):
try:
port._set_rs485_mode(serial.rs485.RS485Settings() if enable else None)
except ValueError:
print(f"Port {port.port} does not support ioctl to enable/disable rs485")
# Continue as the serial port is assumed to be already prepared
# eg. using an USB to RS485 converter.
pass
def transfer(tx, rx, size):
# tx.reset_output_buffer()
# rx.reset_input_buffer()
rand = randomword(size)
tx.write(rand.encode("ascii"))
# tx.flush()
recv = rx.read(size).decode("ascii", "ignore")
if rand == recv:
return True
print()
print(f"ERROR: sent from {tx.name}")
print(f"{rand}")
print(f"and received on {rx.name}")
print(f"{recv}")
return False
def update_serial_settings(tx, rx, baudrate, size):
rx.baudrate = tx.baudrate = baudrate
# Increase timeout based on baudrate and transfer size while giving room for
# "life" (TM) to happen by adding a second to it.
timeout = math.ceil(size / baudrate) + 1
rx.timeout = tx.timeout = timeout
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("-b", "--baudrate", type=int, default=115200)
parser.add_argument(
"--rs485",
action="store_true",
help="Enable rs485 software emulation for half duplex rs485",
)
parser.add_argument(
"-s",
"--size",
type=int,
default=256,
help="number of characters to send for one test",
)
parser.add_argument(
"-F",
"--fuzz",
action="append",
choices=["size", "baudrate"],
help="randomly select baudrate and/or size",
)
parser.add_argument(
"--min-baudrate",
type=int,
default=serial.Serial.BAUDRATES[0],
help="if --fuzz is passed, limits the tested baudrates to anything above that baudrate (included)",
)
parser.add_argument(
"--max-baudrate",
type=int,
default=serial.Serial.BAUDRATES[-1],
help="if --fuzz is passed, limits the tested baudrates to anything below that baudrate (included)",
)
parser.add_argument(
"--min-size",
type=int,
default=1,
help="if --fuzz is passed, limits the tested sizes to anything above that size (included) up to --max-size",
)
parser.add_argument(
"--max-size",
type=int,
default=1024 * 1024,
help="if --fuzz is passed, limits the tested sizes to anything below that size (included) down to --min-size",
)
parser.add_argument(
"-n",
"--loops",
type=int,
default=1,
help="number of tests/loops to run for; -1 for infinite",
)
parser.add_argument(
"-e", "--exit-on-error", action="store_true", help="exit on first error"
)
direction = parser.add_mutually_exclusive_group()
direction.add_argument(
"-R",
"--reverse",
default=False,
action="store_true",
help="swap RX and TX roles",
)
direction.add_argument(
"-B",
"--bidirectional",
default=False,
action="store_true",
help="each test has RX assume RX and TX roles while TX assumes TX and RX roles respectively",
)
parser.add_argument("TX", type=str, help="/dev path to TX UART device")
parser.add_argument("RX", type=str, help="/dev path to RX UART device")
args = parser.parse_args()
rx = serial.Serial(args.TX if args.reverse else args.RX)
tx = serial.Serial(args.RX if args.reverse else args.TX)
set_rs485_mode(tx, args.rs485)
set_rs485_mode(rx, args.rs485)
size = args.size
baudrate = args.baudrate
baudrate_choices = list(
filter(
lambda baud: args.min_baudrate <= baud <= args.max_baudrate, tx.BAUDRATES
)
)
update_serial_settings(tx, rx, baudrate, size)
tx_errors = 0
rx_errors = 0
loop = 0
try:
while loop != args.loops:
loop += 1
if args.fuzz:
if "baudrate" in args.fuzz:
baudrate = random.choice(baudrate_choices)
if "size" in args.fuzz:
size = random.randint(args.min_size, args.max_size)
update_serial_settings(tx, rx, baudrate, size)
print(
f"Loop {loop} {tx.name}->{rx.name} {baudrate}bauds size {size}...",
end="",
)
sys.stdout.flush()
ret = transfer(tx, rx, size)
print("success" if ret else "fail")
tx_errors += 0 if ret else 1
if args.exit_on_error and not ret:
sys.exit(1)
if args.bidirectional:
print(
f"Loop {loop} {rx.name}->{tx.name} {baudrate}bauds size {size}...",
end="",
)
sys.stdout.flush()
ret = transfer(rx, tx, size)
print("success" if ret else "fail")
rx_errors += 0 if ret else 1
if args.exit_on_error and not ret:
sys.exit(1)
if tx_errors:
print(f"{tx.name}->{rx.name}: {tx_errors}/{loop} errors")
if rx_errors:
print(f"{rx.name}->{tx.name}: {rx_errors}/{loop} errors")
except KeyboardInterrupt:
print("")
print("Normal operation interrupted, stopping...")
print("Summary:")
print(f"{tx.name}->{rx.name}: {tx_errors}/{loop} errors")
if args.bidirectional:
print(f"{rx.name}->{tx.name}: {rx_errors}/{loop} errors")
sys.exit(tx_errors or rx_errors)
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