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update thermal_printer README

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cuu 2021-12-22 16:47:51 +08:00
parent 81addc7f4b
commit ed9ab854c5
1 changed files with 6 additions and 1 deletions
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Code/thermal_printer/README.md
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@ -16,8 +16,13 @@
#### ESC ! n
set printer font index,n:0-4
`echo -en "\x1b\x0" > /tmp/DEVTERM_PRINTER_IN`
`echo -en "\x1b\x21\x0" > /tmp/DEVTERM_PRINTER_IN`
`echo -en "\x1b\x21\x1" > /tmp/DEVTERM_PRINTER_IN`
`echo -en "\x1b\x21\x2" > /tmp/DEVTERM_PRINTER_IN`
`echo -en "\x1b\x21\x3" > /tmp/DEVTERM_PRINTER_IN`
`echo -en "\x1b\x21\x4" > /tmp/DEVTERM_PRINTER_IN`
https://github.com/clockworkpi/DevTerm/blob/81addc7f4ba1eb4acb2f59fb1fef70386dbe1f0d/Code/thermal_printer/devterm_thermal_printer.c#L381
#### DC2 # n
n:0-F, set printer printing density