英文:
Pulse DTR and log serial output in non-interactive mode
问题
要记录设备的串行输出，需要执行以下步骤：
- 发送一个1秒的DTR脉冲来复位设备。
- 使用一个非交互式串行监视器，将输出发送到标准输出。
到目前为止，我还没有找到任何可以在非交互模式下执行这两个操作的Shell工具。想法是从systemd用户服务中启动它，以便程序在用户会话结束后可以持续运行。
示例
$ pulse-dtr /dev/ttyUSB0
$ serial-read /dev/ttyUSB0 | multilog s10000000 n5 ~/logs/
PS：我也可以考虑使用简单的Python脚本。
英文:
I want to log the serial output of a device.
To do so, I need to
- Send a 1 second DTR pulse that resets the device
- Use a non-interactive serial monitor that outputs to stdout
So far I have not found any shell tools that can do any of the two in non-interactive mode. The idea is to start it from a systemd user service so the program can run persistently after user session stops.
Example
$ pulse-dtr /dev/ttyUSB0
$ serial-read /dev/ttyUSB0 | multilog s10000000 n5 ~/logs/
PS: I'm open to simple python scripts too
答案1
得分: 1
你可以使用Python pyserial 来操纵 DTR 信号，这个库可能以类似名称的包在你的发行版中可用。然而，某些 USB 串口设备可能不支持它。你可以使用相同的包来设置波特率并从端口读取数据：
#!/usr/bin/python3
# https://stackoverflow.com/a/75688106/5008284
import sys, time
import serial
tty = serial.Serial("/dev/ttyS0", baudrate=9600)
tty.dtr = True
time.sleep(1)
tty.dtr = False
sys.stdout = open(sys.stdout.fileno(), mode='wb', buffering=0)
while True:
ch = tty.read()
sys.stdout.write(ch)
可能需要先将 dtr 设置为 False，然后再设置为 True，而不是相反。此程序读取一个字符并将其无缓冲地写入标准输出，因此你可以将其传递给另一个程序。
英文:
You can manipulate the DTR signals with Python pyserial, which is probably available as a package in your distribution under a similar name. Perhaps some usb serial devices may not implement it, however. You can use the same package to set the baud rate and read from the port:
#!/usr/bin/python3
# https://stackoverflow.com/a/75688106/5008284
import sys, time
import serial
tty = serial.Serial("/dev/ttyS0", baudrate=9600)
tty.dtr = True
time.sleep(1)
tty.dtr = False
sys.stdout = open(sys.stdout.fileno(), mode='wb', buffering=0)
while True:
ch = tty.read()
sys.stdout.write(ch)
You may need to set the dtr to False then True, rather than True then
False. This program reads a single character and writes it unbuffered to
stdout, so you can pipe this into another program.
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