{"id":836,"date":"2019-05-29T11:56:08","date_gmt":"2019-05-29T02:56:08","guid":{"rendered":"https:\/\/ahnbk.com\/?p=836"},"modified":"2019-05-29T11:56:08","modified_gmt":"2019-05-29T02:56:08","slug":"ubuntu%ec%97%90%ec%84%9c-usb-%ec%8b%9c%eb%a6%ac%ec%96%bc%ed%8f%ac%ed%8a%b8-low_latency-%ec%84%a4%ec%a0%95%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/ahnbk.com\/?p=836","title":{"rendered":"Ubuntu\uc5d0\uc11c USB \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8 low_latency \uc124\uc815\ud558\uae30"},"content":{"rendered":"\n

\ub85c\ubd07\uc5d0 \uc678\uc7a5 \uae30\uae30\ub97c \ubd80\ucc29\ud560 \uacbd\uc6b0 USB \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8 \ub514\ubc14\uc774\uc2a4\ub97c \ub9ce\uc774 \uc0ac\uc6a9\ud55c\ub2e4. \uc694\uc998 \ub098\uc628 \uba54\uc778\ubcf4\ub4dc\uc5d4 \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8\uac00 \uc5c6\uc73c\ub2c8 \ub2f9\uc5ec\ud55c \uc774\uc57c\uae30\uc778\ub370, USB \ud1b5\uc2e0\uc758 \ud2b9\uc131\uc0c1 latency timer \uac12\uc774 16ms\ub85c \uae30\ubcf8\uc73c\ub85c \uc124\uc815\ub418\uc5b4 \uc788\uc5b4, \ube60\ub978 \uc751\ub2f5 \ud2b9\uc131\uc744 \uc694\uad6c\ud560\ub54c\uc5d4 \uc18d\ub3c4 \uc800\ud558\uc758 \uc774\uc720\uac00 \ub41c\ub2e4. <\/p>\n\n\n\n

\uba3c\uc800 \ud604\uc7ac \uc124\uc815\ub41c latency_timer \uac12\uc744 \ud655\uc778\ud574\ubcf8\ub2e4.<\/p>\n\n\n\n

$ cat \/cat\/sys\/bus\/usb-serial\/devices\/ttyUSB0\/latency_timer\n16<\/code><\/pre>\n\n\n\n
ttyUSB0\ub294 \uc0ac\uc6a9\uc790\uc758 \ud3ec\ud2b8 \ubc88\ud638\uc5d0 \ub530\ub77c \ubcc0\uacbd\ud558\uc5ec \uc0ac\uc6a9\ud558\uba74 \ub41c\ub2e4. \uc704\uc640 \uac19\uc774 16ms\ub85c \uc124\uc815\ub418\uc5b4 \uc788\ub294 \uac12\uc744 1ms\ub85c \ubcc0\uacbd\ud574\ubcf8\ub2e4.<\/p>\n\n\n\n
$ echo 1 | sudo tee \/sys\/bus\/usb-serial\/devices\/ttyUSB0\/latency_timer<\/code><\/pre>\n\n\n\n
\ubb38\uc81c\ub294 \uc774\ub97c \ubd80\ud305\ub54c\ub9c8\ub2e4 \ubc18\ubcf5\ud574\uc57c \ub418\ub294\ub370, setserial \uba85\ub839\uc5b4\ub97c udev \ub8f0\uc5d0 \ucd94\uac00\ud574\uc11c \uc774\ub97c \uac04\ub2e8\ud788 \ud574\uacb0\ud560 \uc218 \uc788\ub2e4. \uba3c\uc800 setserial\ub97c \uc124\uce58\ud55c\ub2e4.<\/p>\n\n\n\n
$ sudo apt install setserial<\/code><\/pre>\n\n\n\n
\ub2e4\uc74c\uc73c\ub85c \/etc\/udev\/rules.d\ub85c \uc774\ub3d9\ud574\uc11c, 99-ttyUSB.rules \ud30c\uc77c\uc744 \ub9cc\ub4e4\uac70\ub098, \uc774\ubbf8 \uc0ac\uc6a9\ud558\uace0 \uc788\ub294 \ub8f0\uc5d0 \ub2e4\uc74c\uacfc \uac19\uc774 \ucd94\uac00\ud55c\ub2e4.<\/p>\n\n\n\n
KERNEL==\"ttyUSB[0-9]*\", MODE=\"666\", ATTRS{idVendor}=\"0403\", RUN+=\"\/bin\/setserial \/dev\/%k low_latency\"<\/code><\/pre>\n\n\n\n
\uc800\uc7a5\ud558\uace0, \uc7ac\ubd80\ud305\ud55c\ub2e4.<\/p>\n\n\n\n
\uc774\uc81c \uba85\ub839\uc5b4\ub85c \ud655\uc778\ud574\ubcf4\uba74<\/p>\n\n\n\n
$ cat \/cat\/sys\/bus\/usb-serial\/devices\/ttyUSB0\/latency_timer\n1\n$ cat \/cat\/sys\/bus\/usb-serial\/devices\/ttyUSB1\/latency_timer\n1\n$ cat \/cat\/sys\/bus\/usb-serial\/devices\/ttyUSB2\/latency_timer\n1<\/code><\/pre>\n\n\n\n
\ubaa8\ub4e0 USB \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8\uc758 latency_timer \uac12\uc774 1ms\ub85c \uc124\uc815\ub418\uc5b4 \uc788\uc74c\uc744 \ubcfc \uc218 \uc788\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
\ub85c\ubd07\uc5d0 \uc678\uc7a5 \uae30\uae30\ub97c \ubd80\ucc29\ud560 \uacbd\uc6b0 USB \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8 \ub514\ubc14\uc774\uc2a4\ub97c \ub9ce\uc774 \uc0ac\uc6a9\ud55c\ub2e4. \uc694\uc998 \ub098\uc628 \uba54\uc778\ubcf4\ub4dc\uc5d4 \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8\uac00 \uc5c6\uc73c\ub2c8 \ub2f9\uc5ec\ud55c \uc774\uc57c\uae30\uc778\ub370, USB \ud1b5\uc2e0\uc758 \ud2b9\uc131\uc0c1 latency timer \uac12\uc774 16ms\ub85c \uae30\ubcf8\uc73c\ub85c \uc124\uc815\ub418\uc5b4 \uc788\uc5b4, \ube60\ub978 \uc751\ub2f5 \ud2b9\uc131\uc744 \uc694\uad6c\ud560\ub54c\uc5d4 \uc18d\ub3c4 \uc800\ud558\uc758 \uc774\uc720\uac00 \ub41c\ub2e4. \uba3c\uc800 \ud604\uc7ac \uc124\uc815\ub41c latency_timer \uac12\uc744 \ud655\uc778\ud574\ubcf8\ub2e4. ttyUSB0\ub294 \uc0ac\uc6a9\uc790\uc758 \ud3ec\ud2b8 \ubc88\ud638\uc5d0 \ub530\ub77c \ubcc0\uacbd\ud558\uc5ec \uc0ac\uc6a9\ud558\uba74 \ub41c\ub2e4. \uc704\uc640 \uac19\uc774 16ms\ub85c \uc124\uc815\ub418\uc5b4 \uc788\ub294 \uac12\uc744 … <\/p>\n
Continue reading “Ubuntu\uc5d0\uc11c USB \uc2dc\ub9ac\uc5bc\ud3ec\ud2b8 low_latency \uc124\uc815\ud558\uae30”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[59],"tags":[193,191,190,189,192],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2wXSW-du","jetpack-related-posts":[],"jetpack_likes_enabled":false,"_links":{"self":[{"href":"https:\/\/ahnbk.com\/index.php?rest_route=\/wp\/v2\/posts\/836"}],"collection":[{"href":"https:\/\/ahnbk.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ahnbk.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ahnbk.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ahnbk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=836"}],"version-history":[{"count":1,"href":"https:\/\/ahnbk.com\/index.php?rest_route=\/wp\/v2\/posts\/836\/revisions"}],"predecessor-version":[{"id":837,"href":"https:\/\/ahnbk.com\/index.php?rest_route=\/wp\/v2\/posts\/836\/revisions\/837"}],"wp:attachment":[{"href":"https:\/\/ahnbk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ahnbk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ahnbk.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}