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#!/usr/bin/env python3
import re
import serial
import serial.threaded
import sys
import time
cpu_freq = None
timer_overflow = None
class SerialReader(serial.threaded.Protocol):
"""
Character- to line-wise data buffer for serial interfaces.
Reads in new data whenever it becomes available and exposes a line-based
interface to applications.
"""
def __init__(self, callback):
"""Create a new SerialReader object."""
self.callback = callback
self.recv_buf = ""
def __call__(self):
return self
def data_received(self, data):
"""Append newly received serial data to the line buffer."""
try:
str_data = data.decode("UTF-8")
self.recv_buf += str_data
# We may get anything between \r\n, \n\r and simple \n newlines.
# We assume that \n is always present and use str.strip to remove leading/trailing \r symbols
# Note: Do not call str.strip on lines[-1]! Otherwise, lines may be mangled
lines = self.recv_buf.split("\n")
if len(lines) > 1:
self.recv_buf = lines[-1]
for line in lines[:-1]:
self.callback(str.strip(line))
except UnicodeDecodeError:
pass
# sys.stderr.write('UART output contains garbage: {data}\n'.format(data = data))
class SerialMonitor:
"""SerialMonitor captures serial output for a specific amount of time."""
def __init__(self, port: str, baud: int, callback):
"""
Create a new SerialMonitor connected to port at the specified baud rate.
Communication uses no parity, no flow control, and one stop bit.
Data collection starts immediately.
"""
self.ser = serial.serial_for_url(port, do_not_open=True)
self.ser.baudrate = baud
self.ser.parity = "N"
self.ser.rtscts = False
self.ser.xonxoff = False
try:
self.ser.open()
except serial.SerialException as e:
sys.stderr.write(
"Could not open serial port {}: {}\n".format(self.ser.name, e)
)
sys.exit(1)
self.reader = SerialReader(callback=callback)
self.worker = serial.threaded.ReaderThread(self.ser, self.reader)
self.worker.start()
def close(self):
"""Close serial connection."""
self.worker.stop()
self.ser.close()
def handle_line(line):
if cpu_freq is not None:
print_line = line
for match in re.finditer("(\d+)/(\d+) cycles", line):
cycles = int(match.group(1))
overflows = int(match.group(2))
ms = (cycles + timer_overflow * overflows) * 1000 / cpu_freq
match_line = f"{cycles}/{overflows} cycles"
new_line = f"{ms} ms ({cycles}/{overflows} cycles)"
print_line = re.sub(match_line, new_line, print_line)
print(print_line)
else:
print(line)
if __name__ == "__main__":
tty = sys.argv[1]
baud = int(sys.argv[2])
if len(sys.argv) > 4:
cpu_freq = int(sys.argv[3])
timer_overflow = int(sys.argv[4])
monitor = SerialMonitor(tty, baud, handle_line)
time.sleep(5)
monitor.close()