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我看不到 minicom 中输入的任何字符。我已将 RS232（连接到 PC）连接到 USB 电缆（连接到目标/设置）。

user@stretch:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 8087:0aaa Intel Corp. 
Bus 001 Device 003: ID 413c:301a Dell Computer Corp. 
Bus 001 Device 002: ID 413c:2113 Dell Computer Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


user@stretch:~$ dmesg | grep tty
[    0.180811] console [tty0] enabled
[    0.951790] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    0.974611] 0000:01:00.0: ttyS1 at I/O 0x3020 (irq = 16, base_baud = 921600) is a 16550A
[20671.193053] cdc_acm 1-6:1.0: ttyACM0: USB ACM device
[20913.774532] cdc_acm 1-6:1.0: ttyACM0: USB ACM device
[21217.046674] cdc_acm 1-6:1.0: ttyACM0: USB ACM device
[21509.341870] cdc_acm 1-11:1.0: ttyACM0: USB ACM device
[21812.778886] cdc_acm 1-6:1.0: ttyACM0: USB ACM device
[22049.838635] cdc_acm 1-6:1.0: ttyACM0: USB ACM device
[22056.870404] cdc_acm 1-11:1.0: ttyACM0: USB ACM device
[22064.783669] cdc_acm 1-9:1.0: ttyACM0: USB ACM device

Minicom Settings:

    +-----------------------------------------------------------------------+
    | A -    Serial Device      : /dev/ttyS0                                |
    | B - Lockfile Location     : /var/lock                                 |
    | C -   Callin Program      :                                           |
    | D -  Callout Program      :                                           |
    | E -    Bps/Par/Bits       : 115200 8N1                                |
    | F - Hardware Flow Control : No                                        |
    | G - Software Flow Control : No                                        |
    |                                                                       |
    |    Change which setting?                                              |
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