There's not a lot to this image. It's a picture of the SD card, with the cable plugged in and the switch in the correct position.
I've tried it with and without the TF card inserted. No matter what I try, there is no serial port recognized when I plug in the USB.
Normally when I plug in a USB uart, I get a new device named /dev/ttyUSB0 or /dev/ttyUSB1, depending on what number device it is. I don't get a new /dev/ttyUSB device when I plug in. No matter the position of the switch, I just get a new USB storage device.
Here's my list of tty in /dev/ before I plug it in.
anewsome@swxl:~$ ls /dev/tty*
/dev/tty /dev/tty23 /dev/tty39 /dev/tty54 /dev/ttyS10 /dev/ttyS26
/dev/tty0 /dev/tty24 /dev/tty4 /dev/tty55 /dev/ttyS11 /dev/ttyS27
/dev/tty1 /dev/tty25 /dev/tty40 /dev/tty56 /dev/ttyS12 /dev/ttyS28
/dev/tty10 /dev/tty26 /dev/tty41 /dev/tty57 /dev/ttyS13 /dev/ttyS29
/dev/tty11 /dev/tty27 /dev/tty42 /dev/tty58 /dev/ttyS14 /dev/ttyS3
/dev/tty12 /dev/tty28 /dev/tty43 /dev/tty59 /dev/ttyS15 /dev/ttyS30
/dev/tty13 /dev/tty29 /dev/tty44 /dev/tty6 /dev/ttyS16 /dev/ttyS31
/dev/tty14 /dev/tty3 /dev/tty45 /dev/tty60 /dev/ttyS17 /dev/ttyS4
/dev/tty15 /dev/tty30 /dev/tty46 /dev/tty61 /dev/ttyS18 /dev/ttyS5
/dev/tty16 /dev/tty31 /dev/tty47 /dev/tty62 /dev/ttyS19 /dev/ttyS6
/dev/tty17 /dev/tty32 /dev/tty48 /dev/tty63 /dev/ttyS2 /dev/ttyS7
/dev/tty18 /dev/tty33 /dev/tty49 /dev/tty7 /dev/ttyS20 /dev/ttyS8
/dev/tty19 /dev/tty34 /dev/tty5 /dev/tty8 /dev/ttyS21 /dev/ttyS9
/dev/tty2 /dev/tty35 /dev/tty50 /dev/tty9 /dev/ttyS22
/dev/tty20 /dev/tty36 /dev/tty51 /dev/ttyprintk /dev/ttyS23
/dev/tty21 /dev/tty37 /dev/tty52 /dev/ttyS0 /dev/ttyS24
/dev/tty22 /dev/tty38 /dev/tty53 /dev/ttyS1 /dev/ttyS25
After I plug in the card, the device list is the same. I verified it with diff.
I've also verified that the CH340 driver is loaded:
anewsome@swxl:~$ lsmod | grep ch34
ch34x 24576 0
usbserial 49152 1 ch34x
The driver is definitely loaded. When plugging in the device, dmesg does not show a new tty was recognized. Only the storage device is recognized:
[13425.400939] usb 1-1: new high-speed USB device number 13 using xhci_hcd
[13425.552968] usb 1-1: New USB device found, idVendor=05e3, idProduct=0751, bcdDevice=14.04
[13425.552971] usb 1-1: New USB device strings: Mfr=3, Product=4, SerialNumber=0
[13425.552973] usb 1-1: Product: USB Storage
[13425.552974] usb 1-1: Manufacturer: USB Storage
[13425.554714] usb-storage 1-1:1.0: USB Mass Storage device detected
[13425.555061] scsi host1: usb-storage 1-1:1.0
[13426.566221] scsi 1:0:0:0: Direct-Access Generic STORAGE DEVICE 1404 PQ: 0 ANSI: 6
[13426.566806] sd 1:0:0:0: Attached scsi generic sg1 type 0
[13426.624157] sd 1:0:0:0: [sdb] 62521344 512-byte logical blocks: (32.0 GB/29.8 GiB)
[13426.625288] sd 1:0:0:0: [sdb] Write Protect is off
[13426.625291] sd 1:0:0:0: [sdb] Mode Sense: 21 00 00 00
[13426.626500] sd 1:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[13426.632526] sdb: sdb1
[13426.636524] sd 1:0:0:0: [sdb] Attached SCSI removable disk