{"id":1550,"date":"2026-04-09T23:51:48","date_gmt":"2026-04-09T15:51:48","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/diagnosing-race-condition-timing-diagram-iot\/"},"modified":"2026-04-09T23:51:48","modified_gmt":"2026-04-09T15:51:48","slug":"diagnosing-race-condition-timing-diagram-iot","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/diagnosing-race-condition-timing-diagram-iot\/","title":{"rendered":"Nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p: Ch\u1ea9n \u0111o\u00e1n \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh b\u1eb1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian trong IoT"},"content":{"rendered":"<p>Trong th\u1ebf gi\u1edbi ph\u1ee9c t\u1ea1p c\u1ee7a h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 ki\u1ebfn tr\u00fac Internet v\u1ea1n v\u1eadt (IoT), th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1; n\u00f3 l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c c\u01a1 b\u1ea3n quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ec7 th\u1ed1ng. Khi nhi\u1ec1u lu\u1ed3ng ho\u1eb7c ng\u1eaft c\u1ed1 g\u1eafng truy c\u1eadp c\u00e1c t\u00e0i nguy\u00ean chung c\u00f9ng l\u00fac, nguy c\u01a1 x\u1ea3y ra \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh s\u1ebd n\u1ea3y sinh. H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p m\u1ed9t ph\u00e2n t\u00edch k\u1ef9 thu\u1eadt v\u1ec1 c\u00e1ch ch\u1ea9n \u0111o\u00e1n c\u00e1c v\u1ea5n \u0111\u1ec1 \u0111\u1ed3ng b\u1ed9 h\u00f3a nh\u01b0 v\u1eady b\u1eb1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u01a1 ch\u1ebf th\u1ef1c thi \u0111\u1ed3ng th\u1eddi, ph\u00e2n t\u00edch c\u00e1c chuy\u1ec3n ti\u1ebfp t\u00edn hi\u1ec7u v\u00e0 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c kho\u1ea3nh kh\u1eafc m\u00e0 logic l\u1ec7ch kh\u1ecfi h\u00e0nh vi mong mu\u1ed1n.<\/p>\n<figure class=\"wp-block-image aligncenter\"><img alt=\"Marker-style infographic illustrating how to diagnose race conditions in IoT embedded systems using timing diagrams, featuring a smart energy meter case study with Read-Modify-Write cycle visualization, conflict window analysis, and four resolution strategies: interrupt masking, atomic instructions, mutex\/semaphore locking, and double buffering\" decoding=\"async\" src=\"https:\/\/mayaharper.showcasingme.net\/wp-content\/uploads\/2026\/04\/iot-race-condition-timing-diagram-infographic-marker-illustration.jpg\"\/><\/figure>\n<h2>\ud83e\udde9 Hi\u1ec3u v\u1ec1 t\u00ednh \u0111\u1ed3ng th\u1eddi trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang<\/h2>\n<p>C\u00e1c thi\u1ebft b\u1ecb IoT th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi c\u00e1c gi\u1edbi h\u1ea1n nghi\u00eam ng\u1eb7t v\u1ec1 n\u0103ng l\u01b0\u1ee3ng v\u00e0 x\u1eed l\u00fd. \u0110\u1ec3 t\u1ed1i \u0111a h\u00f3a hi\u1ec7u su\u1ea5t, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n th\u01b0\u1eddng xuy\u00ean tri\u1ec3n khai c\u00e1c qu\u00e1 tr\u00ecnh \u0111\u1ed3ng th\u1eddi. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 b\u1ed9 x\u1eed l\u00fd trung t\u00e2m (CPU) x\u1eed l\u00fd nhi\u1ec1u t\u00e1c v\u1ee5 c\u00f9ng l\u00fac, ch\u1eb3ng h\u1ea1n nh\u01b0 qu\u00e9t c\u1ea3m bi\u1ebfn, truy\u1ec1n m\u1ea1ng v\u00e0 \u0111i\u1ec1u khi\u1ec3n c\u01a1 c\u1ea5u ch\u1ea5p h\u00e0nh, d\u01b0\u1eddng nh\u01b0 c\u00f9ng m\u1ed9t l\u00fac. Tuy nhi\u00ean, s\u1ef1 song song th\u1ef1c s\u1ef1 l\u00e0 hi\u1ebfm g\u1eb7p \u1edf c\u00e1c vi \u0111i\u1ec1u khi\u1ec3n \u0111\u01a1n l\u00f5i. Thay v\u00e0o \u0111\u00f3, vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i ng\u1eef c\u1ea3nh nhanh t\u1ea1o n\u00ean \u1ea3o gi\u00e1c v\u1ec1 s\u1ef1 \u0111\u1ed3ng th\u1eddi.<\/p>\n<ul>\n<li><strong>B\u1ed9 nh\u1edb chia s\u1ebb:<\/strong>Bi\u1ebfn c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c b\u1edfi c\u1ea3 tr\u00ecnh d\u1ecbch v\u1ee5 ng\u1eaft (ISR) v\u00e0 v\u00f2ng l\u1eb7p ch\u00ednh.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb ngo\u1ea1i vi ph\u1ea7n c\u1ee9ng:<\/strong>C\u00e1c thanh ghi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho giao ti\u1ebfp UART, SPI ho\u1eb7c I2C.<\/li>\n<li><strong>M\u00e1y tr\u1ea1ng th\u00e1i:<\/strong>Logic chuy\u1ec3n \u0111\u1ed5i d\u1ef1a tr\u00ean c\u00e1c t\u00edn hi\u1ec7u k\u00edch ho\u1ea1t b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n<p>Khi c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y t\u01b0\u01a1ng t\u00e1c m\u00e0 kh\u00f4ng c\u00f3 c\u00e1c c\u00f4ng c\u1ee5 \u0111\u1ed3ng b\u1ed9 h\u00f3a ph\u00f9 h\u1ee3p, tr\u1ea1ng th\u00e1i h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean kh\u00f4ng x\u00e1c \u0111\u1ecbnh. M\u1ed9t \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh x\u1ea3y ra khi k\u1ebft qu\u1ea3 c\u1ee7a m\u1ed9t qu\u00e1 tr\u00ecnh ph\u1ee5 thu\u1ed9c v\u00e0o th\u1ee9 t\u1ef1 th\u1eddi gian t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a c\u00e1c s\u1ef1 ki\u1ec7n m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o x\u1ea3y ra theo m\u1ed9t th\u1ee9 t\u1ef1 c\u1ee5 th\u1ec3.<\/p>\n<h2>\ud83d\udcca Vai tr\u00f2 c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian trong vi\u1ec7c g\u1ee1 l\u1ed7i \ud83d\udee0\ufe0f<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan v\u1ec1 c\u00e1c t\u00edn hi\u1ec7u theo tr\u1ee5c th\u1eddi gian x\u00e1c \u0111\u1ecbnh. Trong b\u1ed1i c\u1ea3nh g\u1ee1 l\u1ed7i, n\u00f3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t c\u00f4ng c\u1ee5 \u0111i\u1ec1u tra. Kh\u00e1c v\u1edbi vi\u1ec7c xem x\u00e9t m\u00e3 t\u0129nh, s\u01a1 \u0111\u1ed3 th\u1eddi gian ghi l\u1ea1i h\u00e0nh vi \u0111\u1ed9ng c\u1ee7a t\u01b0\u01a1ng t\u00e1c gi\u1eefa ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m. N\u00f3 gi\u00fap c\u00e1c k\u1ef9 s\u01b0 nh\u00ecn th\u1ea5y \u0111\u1ed9 tr\u1ec5, \u0111\u1ed9 dao \u0111\u1ed9ng v\u00e0 c\u00e1c kho\u1ea3ng th\u1eddi gian th\u1ef1c thi ch\u1ed3ng l\u1ea5n.<\/p>\n<h3>C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian<\/h3>\n<table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th><strong>Th\u00e0nh ph\u1ea7n<\/strong><\/th>\n<th><strong>M\u00f4 t\u1ea3<\/strong><\/th>\n<th><strong>Li\u00ean quan \u0111\u1ebfn \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Tr\u1ee5c th\u1eddi gian<\/strong><\/td>\n<td>\u0110\u01b0\u1eddng ngang bi\u1ec3u di\u1ec5n kho\u1ea3ng th\u1eddi gian (ns, \u03bcs, ms)<\/td>\n<td>Thi\u1ebft l\u1eadp th\u1ee9 t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td><strong>C\u00e1c \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u<\/strong><\/td>\n<td>C\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng bi\u1ec3u di\u1ec5n c\u00e1c ch\u00e2n c\u1ee5 th\u1ec3 ho\u1eb7c bi\u1ebfn s\u1ed1<\/td>\n<td>Hi\u1ec3n th\u1ecb tr\u1ea1ng th\u00e1i cao\/th\u1ea5p ho\u1eb7c thay \u0111\u1ed5i d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td><strong>Chuy\u1ec3n ti\u1ebfp<\/strong><\/td>\n<td>C\u00e1c c\u1ea1nh n\u01a1i tr\u1ea1ng th\u00e1i t\u00edn hi\u1ec7u thay \u0111\u1ed5i (l\u00ean\/xu\u1ed1ng)<\/td>\n<td>Ch\u1ec9 ra c\u00e1c \u0111i\u1ec3m k\u00edch ho\u1ea1t cho ng\u1eaft<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110i\u1ec3m \u0111\u00e1nh d\u1ea5u \u0111\u1ed9 tr\u1ec5<\/strong><\/td>\n<td>Kho\u1ea3ng th\u1eddi gian tr\u1ec5 gi\u1eefa t\u00edn hi\u1ec7u k\u00edch ho\u1ea1t v\u00e0 ph\u1ea3n h\u1ed3i<\/td>\n<td>B\u1ed9c l\u1ed9 c\u00e1c \u0111i\u1ec3m ngh\u1ebdn x\u1eed l\u00fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\ud83c\udfed T\u00ecnh hu\u1ed1ng nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p: \u0110\u1ed3ng h\u1ed3 \u0111o n\u0103ng l\u01b0\u1ee3ng th\u00f4ng minh<\/h2>\n<p>X\u00e9t m\u1ed9t \u0111\u1ed3ng h\u1ed3 \u0111o n\u0103ng l\u01b0\u1ee3ng IoT \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111o c\u00e1c xung \u0111i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n. Thi\u1ebft b\u1ecb ph\u1ea3i ghi l\u1ea1i c\u00e1c xung n\u00e0y v\u00e0o b\u1ed9 nh\u1edb kh\u00f4ng m\u1ea5t m\u00e1t trong khi \u0111\u1ed3ng th\u1eddi truy\u1ec1n m\u1ed9t g\u00f3i d\u1eef li\u1ec7u t\u00f3m t\u1eaft \u0111\u1ebfn c\u1ed5ng k\u1ebft n\u1ed1i \u0111\u00e1m m\u00e2y th\u00f4ng qua m\u1ed9t module k\u1ebft n\u1ed1i di \u0111\u1ed9ng. Ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng bao g\u1ed3m m\u1ed9t v\u00f2ng l\u1eb7p \u1ee9ng d\u1ee5ng ch\u00ednh v\u00e0 m\u1ed9t ng\u1eaft ph\u1ea7n c\u1ee9ng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi vi\u1ec7c v\u01b0\u1ee3t ng\u01b0\u1ee1ng \u0111i\u1ec7n \u00e1p.<\/p>\n<h3>Th\u00f4ng s\u1ed1 h\u1ec7 th\u1ed1ng<\/h3>\n<ul>\n<li><strong>B\u1ed9 vi \u0111i\u1ec1u khi\u1ec3n:<\/strong>B\u1ed9 x\u1eed l\u00fd d\u1ef1a tr\u00ean ARM Cortex-M4 32-bit<\/li>\n<li><strong>T\u00e0i nguy\u00ean chung:<\/strong>M\u1ed9t bi\u1ebfn \u0111\u1ebfm 4 byte trong RAM<\/li>\n<li><strong>Ngu\u1ed3n ng\u1eaft:<\/strong>B\u1ed9 so s\u00e1nh \u0111i\u1ec7n \u00e1p b\u00ean ngo\u00e0i<\/li>\n<li><strong>Nhi\u1ec7m v\u1ee5 v\u00f2ng l\u1eb7p ch\u00ednh:<\/strong>T\u1ed5ng h\u1ee3p v\u00e0 truy\u1ec1n d\u1eef li\u1ec7u \u0111\u1ecbnh k\u1ef3<\/li>\n<\/ul>\n<p>Logic d\u1ef1 ki\u1ebfn l\u00e0 \u0111\u01a1n gi\u1ea3n: khi x\u1ea3y ra xung \u0111i\u1ec7n \u00e1p, ng\u1eaft s\u1ebd t\u0103ng bi\u1ebfn \u0111\u1ebfm. V\u00f2ng l\u1eb7p ch\u00ednh \u0111\u1ecdc gi\u00e1 tr\u1ecb bi\u1ebfn \u0111\u1ebfm, truy\u1ec1n gi\u00e1 tr\u1ecb \u0111\u00f3 v\u00e0 \u0111\u1eb7t l\u1ea1i v\u1ec1 0. D\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n t\u1ea3i b\u00ecnh th\u01b0\u1eddng, \u0111i\u1ec1u n\u00e0y ho\u1ea1t \u0111\u1ed9ng t\u1ed1t. Tuy nhi\u00ean, d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n t\u1ea3i cao, d\u1eef li\u1ec7u b\u1ecb l\u1ed7i.<\/p>\n<h2>\ud83d\udcc8 Ph\u00e2n t\u00edch lu\u1ed3ng t\u00edn hi\u1ec7u<\/h2>\n<p>\u0110\u1ec3 ch\u1ea9n \u0111o\u00e1n v\u1ea5n \u0111\u1ec1, ch\u00fang ta x\u00e2y d\u1ef1ng m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian t\u1eadp trung v\u00e0o t\u01b0\u01a1ng t\u00e1c gi\u1eefa Th\u1ee7 t\u1ee5c ph\u1ee5c v\u1ee5 ng\u1eaft (ISR) v\u00e0 V\u00f2ng l\u1eb7p ch\u00ednh. S\u01a1 \u0111\u1ed3 n\u00e0y minh h\u1ecda lu\u1ed3ng th\u1ef1c thi CPU, tr\u1ea1ng th\u00e1i t\u00edn hi\u1ec7u c\u1ee7a bi\u1ebfn \u0111\u1ebfm chung v\u00e0 tr\u1ea1ng th\u00e1i c\u1ee7a bus d\u1eef li\u1ec7u ngo\u1ea1i vi.<\/p>\n<h3>Giai \u0111o\u1ea1n 1: Chu k\u1ef3 \u0110\u1ecdc-S\u1eeda-Vi\u1ebft<\/h3>\n<p>H\u1ea1t nh\u00e2n c\u1ee7a t\u00ecnh tr\u1ea1ng c\u1ea1nh tranh n\u1eb1m \u1edf chu\u1ed7i thao t\u00e1c \u0110\u1ecdc-S\u1eeda-Vi\u1ebft (RMW). Thao t\u00e1c n\u00e0y kh\u00f4ng nguy\u00ean t\u1eed tr\u00ean nhi\u1ec1u ki\u1ebfn tr\u00fac. N\u00f3 bao g\u1ed3m ba b\u01b0\u1edbc ri\u00eang bi\u1ec7t:<\/p>\n<ol>\n<li><strong>\u0110\u1ecdc:<\/strong>B\u1ed9 x\u1eed l\u00fd l\u1ea5y gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i t\u1eeb b\u1ed9 nh\u1edb.<\/li>\n<li><strong>S\u1eeda:<\/strong>B\u1ed9 x\u1eed l\u00fd c\u1ed9ng th\u00eam m\u1ed9t v\u00e0o gi\u00e1 tr\u1ecb thanh ghi.<\/li>\n<li><strong>Vi\u1ebft:<\/strong>B\u1ed9 x\u1eed l\u00fd l\u01b0u gi\u00e1 tr\u1ecb m\u1edbi tr\u1edf l\u1ea1i b\u1ed9 nh\u1edb.<\/li>\n<\/ol>\n<p>N\u1ebfu m\u1ed9t ng\u1eaft x\u1ea3y ra gi\u1eefa b\u01b0\u1edbc 1 v\u00e0 b\u01b0\u1edbc 3, t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng. H\u00e3y c\u00f9ng xem bi\u1ec3u di\u1ec5n s\u01a1 \u0111\u1ed3 th\u1eddi gian c\u1ee7a s\u1ef1 ki\u1ec7n n\u00e0y.<\/p>\n<h3>Bi\u1ec3u di\u1ec5n s\u01a1 \u0111\u1ed3 th\u1eddi gian<\/h3>\n<table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th><strong>Th\u1eddi gian (\u03bcs)<\/strong><\/th>\n<th><strong>V\u00f2ng l\u1eb7p ch\u00ednh<\/strong><\/th>\n<th><strong>ISR<\/strong><\/th>\n<th><strong>Gi\u00e1 tr\u1ecb bi\u1ebfn \u0111\u1ebfm chung<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>\u0110\u1ecdc bi\u1ebfn \u0111\u1ebfm (Gi\u00e1 tr\u1ecb: 10)<\/td>\n<td>Ng\u01b0ng ho\u1ea1t \u0111\u1ed9ng<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td><em>Thanh ghi l\u01b0u tr\u1eef 10<\/em><\/td>\n<td>Ng\u1eaft \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>S\u1eeda \u0111\u1ed5i (10 + 1 = 11)<\/td>\n<td>\u0110\u1ecdc b\u1ed9 \u0111\u1ebfm (Gi\u00e1 tr\u1ecb: 10)<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td><em>Ng\u1eaft \u0111ang ch\u1edd x\u1eed l\u00fd<\/em><\/td>\n<td>S\u1eeda \u0111\u1ed5i (10 + 1 = 11)<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>Ghi (11)<\/td>\n<td>Ghi (11)<\/td>\n<td>11<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>\u0110\u1eb7t l\u1ea1i b\u1ed9 \u0111\u1ebfm (0)<\/td>\n<td>Tr\u1edf v\u1ec1 ng\u1eaft<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td>15<\/td>\n<td>K\u1ebft th\u00fac chu k\u1ef3<\/td>\n<td>Tr\u1edf v\u1ec1 v\u00f2ng l\u1eb7p ch\u00ednh<\/td>\n<td>0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>L\u01b0u \u00fd s\u1ef1 ch\u00eanh l\u1ec7ch trong gi\u00e1 tr\u1ecb cu\u1ed1i c\u00f9ng. C\u1ea3 v\u00f2ng l\u1eb7p ch\u00ednh v\u00e0 ISR \u0111\u1ec1u \u0111\u1ecdc gi\u00e1 tr\u1ecb<strong>10<\/strong>. C\u1ea3 hai \u0111\u1ec1u c\u1ed9ng th\u00eam m\u1ed9t, d\u1eabn \u0111\u1ebfn<strong>11<\/strong>. V\u00f2ng l\u1eb7p ch\u00ednh ghi 11. ISR ghi \u0111\u00e8 gi\u00e1 tr\u1ecb n\u00e0y b\u1eb1ng 11. K\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng l\u00e0 11, trong khi l\u1ebd ra ph\u1ea3i l\u00e0 12. Xung \u0111\u01b0\u1ee3c ISR ph\u00e1t hi\u1ec7n th\u1ef1c t\u1ebf \u0111\u00e3 b\u1ecb m\u1ea5t v\u00ec v\u00f2ng l\u1eb7p ch\u00ednh \u0111ang \u1edf gi\u1eefa qu\u00e1 tr\u00ecnh x\u1eed l\u00fd gi\u00e1 tr\u1ecb \u0111\u1ebfm tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n<h2>\ud83d\udd0d X\u00e1c \u0111\u1ecbnh kho\u1ea3ng th\u1eddi gian xung \u0111\u1ed9t<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0m cho kho\u1ea3ng th\u1eddi gian xung \u0111\u1ed9t tr\u1edf n\u00ean r\u00f5 r\u00e0ng. \u0110\u00e2y l\u00e0 kho\u1ea3ng th\u1eddi gian gi\u1eefa vi\u1ec7c v\u00f2ng l\u1eb7p ch\u00ednh \u0111\u1ecdc bi\u1ebfn v\u00e0 ghi gi\u00e1 tr\u1ecb m\u1edbi. Trong ki\u1ebfn tr\u00fac c\u1ee5 th\u1ec3 n\u00e0y, chu k\u1ef3 m\u1ea5t kho\u1ea3ng 8 microgi\u00e2y. \u0110\u1ed9 tr\u1ec5 ng\u1eaft ph\u1ea3i ng\u1eafn h\u01a1n kho\u1ea3ng th\u1eddi gian n\u00e0y \u0111\u1ec3 \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh x\u1ea3y ra.<\/p>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kho\u1ea3ng th\u1eddi gian<\/h3>\n<ul>\n<li><strong>T\u1ed1c \u0111\u1ed9 \u0111\u1ed3ng h\u1ed3:<\/strong>T\u1ea7n s\u1ed1 cao h\u01a1n l\u00e0m gi\u1ea3m th\u1eddi gian v\u1eadt l\u00fd c\u1ee7a chu k\u1ef3 RMW.<\/li>\n<li><strong>\u0110\u1ed9 tr\u1ec5 b\u1ed9 nh\u1edb:<\/strong>C\u00e1c tr\u1ea1ng th\u00e1i ch\u1edd trong SRAM ho\u1eb7c Flash c\u00f3 th\u1ec3 l\u00e0m t\u0103ng th\u1eddi gian \u0111\u1ecdc\/ghi.<\/li>\n<li><strong>T\u1ed1i \u01b0u h\u00f3a tr\u00ecnh bi\u00ean d\u1ecbch:<\/strong>Vi\u1ec7c nh\u00fang h\u00e0m (inlining) ho\u1eb7c ph\u00e2n b\u1ed5 thanh ghi c\u00f3 th\u1ec3 thay \u0111\u1ed5i th\u1eddi gian th\u1ef1c thi l\u1ec7nh.<\/li>\n<li><strong>\u01afu ti\u00ean ng\u1eaft:<\/strong>N\u1ebfu \u01b0u ti\u00ean ng\u1eaft th\u1ea5p h\u01a1n m\u1ed9t \u0111o\u1ea1n m\u00e3 quan tr\u1ecdng trong v\u00f2ng l\u1eb7p ch\u00ednh, \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh c\u00f3 th\u1ec3 b\u1ecb che khu\u1ea5t.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch \u0111o s\u1ed1 chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 th\u1ef1c t\u1ebf b\u1eb1ng b\u1ed9 ph\u00e2n t\u00edch logic ho\u1eb7c b\u1ed9 gi\u00e1m s\u00e1t hi\u1ec7u su\u1ea5t t\u00edch h\u1ee3p tr\u00ean chip, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 t\u00ednh to\u00e1n ch\u00ednh x\u00e1c kho\u1ea3ng th\u1eddi gian ph\u01a1i nhi\u1ec5m. D\u1eef li\u1ec7u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem vi\u1ec7c s\u1eeda l\u1ed7i b\u1eb1ng ph\u1ea7n m\u1ec1m \u0111\u01a1n gi\u1ea3n c\u00f3 kh\u1ea3 thi hay c\u1ea7n can thi\u1ec7p ph\u1ea7n c\u1ee9ng.<\/p>\n<h2>\ud83d\udee1\ufe0f C\u00e1c chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3i quy\u1ebft<\/h2>\n<p>Sau khi \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn th\u00f4ng qua ph\u00e2n t\u00edch th\u1eddi gian, c\u1ea7n th\u1ef1c hi\u1ec7n nh\u1eefng thay \u0111\u1ed5i ki\u1ebfn tr\u00fac c\u1ee5 th\u1ec3. M\u1ee5c ti\u00eau l\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111o\u1ea1n m\u00e3 quan tr\u1ecdng (thao t\u00e1c RMW) \u0111\u01b0\u1ee3c th\u1ef1c thi m\u1ed9t c\u00e1ch nguy\u00ean t\u1eed ho\u1eb7c \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 kh\u1ecfi b\u1ecb ng\u1eaft.<\/p>\n<h3>1. Che ng\u1eaft<\/h3>\n<p>C\u00e1ch ti\u1ebfp c\u1eadn tr\u1ef1c ti\u1ebfp nh\u1ea5t l\u00e0 v\u00f4 hi\u1ec7u h\u00f3a ng\u1eaft trong \u0111o\u1ea1n m\u00e3 quan tr\u1ecdng. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng kh\u00f4ng c\u00f3 ISR n\u00e0o c\u00f3 th\u1ec3 chi\u1ebfm quy\u1ec1n \u0111i\u1ec1u khi\u1ec3n v\u00f2ng l\u1eb7p ch\u00ednh khi n\u00f3 \u0111ang c\u1eadp nh\u1eadt bi\u1ebfn chung.<\/p>\n<ul>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong>S\u1eed d\u1ee5ng c\u00e1c l\u1ec7nh h\u1ee3p ng\u1eef \u0111\u1ec3 x\u00f3a c\u1edd b\u1eadt ng\u1eaft tr\u01b0\u1edbc khi \u0111\u1ecdc v\u00e0 thi\u1ebft l\u1eadp l\u1ea1i sau khi ghi.<\/li>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong>\u0110\u1ea3m b\u1ea3o t\u00ednh nguy\u00ean t\u1eed m\u00e0 kh\u00f4ng c\u1ea7n c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>L\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5 ng\u1eaft cho t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb ngo\u1ea1i vi kh\u00e1c. C\u00e1c ng\u1eaft c\u00f3 \u01b0u ti\u00ean cao c\u00f3 th\u1ec3 b\u1ecb tr\u00ec ho\u00e3n, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t th\u1eddi gian th\u1ef1c.<\/li>\n<\/ul>\n<h3>2. L\u1ec7nh nguy\u00ean t\u1eed<\/h3>\n<p>C\u00e1c b\u1ed9 x\u1eed l\u00fd hi\u1ec7n \u0111\u1ea1i th\u01b0\u1eddng cung c\u1ea5p h\u1ed7 tr\u1ee3 ph\u1ea7n c\u1ee9ng cho c\u00e1c thao t\u00e1c nguy\u00ean t\u1eed. Nh\u1eefng l\u1ec7nh n\u00e0y th\u1ef1c hi\u1ec7n chu\u1ed7i \u0111\u1ecdc-s\u1eeda-ghi trong m\u1ed9t chu k\u1ef3 m\u00e1y duy nh\u1ea5t v\u00e0 kh\u00f4ng th\u1ec3 chia t\u00e1ch.<\/p>\n<ul>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong>S\u1eed d\u1ee5ng c\u00e1c h\u00e0m th\u01b0 vi\u1ec7n ho\u1eb7c h\u00e0m nh\u00fang \u00e1nh x\u1ea1 \u0111\u1ebfn l\u1ec7nh so s\u00e1nh-\u0111\u1ed5i (CAS) ho\u1eb7c l\u1ea5y-v\u00e0-c\u1ed9ng nguy\u00ean t\u1eed.<\/li>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong>T\u1ed5n th\u1ea5t hi\u1ec7u su\u1ea5t t\u1ed1i thi\u1ec3u; kh\u00f4ng c\u1ea7n v\u00f4 hi\u1ec7u h\u00f3a ng\u1eaft to\u00e0n c\u1ee5c.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>Ph\u1ee5 thu\u1ed9c v\u00e0o ph\u1ea7n c\u1ee9ng; kh\u00f4ng c\u00f3 s\u1eb5n tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c vi \u0111i\u1ec1u khi\u1ec3n \u0111\u1eddi c\u0169.<\/li>\n<\/ul>\n<h3>3. Kh\u00f3a ph\u1ea7n m\u1ec1m (Mutex\/Semaphore)<\/h3>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c t\u00e0i nguy\u00ean chia s\u1ebb ph\u1ee9c t\u1ea1p h\u01a1n, ch\u1eb3ng h\u1ea1n nh\u01b0 b\u1ed9 \u0111\u1ec7m truy\u1ec1n th\u00f4ng, c\u01a1 ch\u1ebf kh\u00f3a l\u00e0 c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o ch\u1ec9 c\u00f3 m\u1ed9t lu\u1ed3ng ho\u1eb7c ti\u1ebfn tr\u00ecnh truy c\u1eadp t\u00e0i nguy\u00ean t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m.<\/p>\n<ul>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong>M\u1ed9t c\u1edd trong b\u1ed9 nh\u1edb cho bi\u1ebft t\u00e0i nguy\u00ean \u0111ang b\u1eadn. V\u00f2ng l\u1eb7p ch\u00ednh ki\u1ec3m tra c\u1edd; ISR ki\u1ec3m tra c\u1edd tr\u01b0\u1edbc khi c\u1ed1 g\u1eafng truy c\u1eadp.<\/li>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong>Linh ho\u1ea1t; cho ph\u00e9p \u01b0u ti\u00ean c\u00e1c t\u00e1c v\u1ee5.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>G\u00e2y ra chi ph\u00ed chuy\u1ec3n \u0111\u1ed5i ng\u1eef c\u1ea3nh v\u00e0 ti\u1ec1m \u1ea9n nguy c\u01a1 k\u1eb9t ti\u1ebfn tr\u00ecnh n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd \u0111\u00fang c\u00e1ch.<\/li>\n<\/ul>\n<h3>4. \u0110\u1ec7m k\u00e9p<\/h3>\n<p>Trong c\u00e1c t\u00ecnh hu\u1ed1ng truy\u1ec1n d\u1eef li\u1ec7u, \u0111\u1ec7m k\u00e9p c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf nhu c\u1ea7u \u0111\u1ed3ng b\u1ed9 h\u00f3a trong giai \u0111o\u1ea1n ghi d\u1eef li\u1ec7u. V\u00f2ng l\u1eb7p ch\u00ednh ghi v\u00e0o B\u1ed9 \u0111\u1ec7m A trong khi ISR \u0111\u1ecdc t\u1eeb B\u1ed9 \u0111\u1ec7m B.<\/p>\n<ul>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong>Duy tr\u00ec hai v\u00f9ng b\u1ed9 nh\u1edb ri\u00eang bi\u1ec7t. \u0110\u1ed5i ch\u1ed7 con tr\u1ecf gi\u1eefa ch\u00fang khi m\u1ed9t kh\u1ed1i \u0111\u1ea7y \u0111\u1ee7 \u0111\u00e3 s\u1eb5n s\u00e0ng.<\/li>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong>Ng\u0103n ng\u1eeba l\u1ed7i d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh truy\u1ec1n; t\u00e1ch bi\u1ec7t qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau th\u1ee5.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>G\u1ea5p \u0111\u00f4i vi\u1ec7c s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb; y\u00eau c\u1ea7u qu\u1ea3n l\u00fd con tr\u1ecf c\u1ea9n th\u1eadn.<\/li>\n<\/ul>\n<h2>\ud83d\udd04 X\u00e1c minh v\u00e0 Ki\u1ec3m th\u1eed<\/h2>\n<p>Sau khi \u00e1p d\u1ee5ng s\u1eeda l\u1ed7i, s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i \u0111\u01b0\u1ee3c t\u1ea1o l\u1ea1i \u0111\u1ec3 x\u00e1c minh gi\u1ea3i ph\u00e1p. M\u1ee5c ti\u00eau l\u00e0 ki\u1ec3m tra xem s\u1ef1 ch\u1ed3ng l\u1ea5n gi\u1eefa c\u00e1c \u0111o\u1ea1n m\u00e3 quan tr\u1ecdng c\u1ee7a V\u00f2ng l\u1eb7p ch\u00ednh v\u00e0 ISR \u0111\u00e3 \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf hay ch\u01b0a.<\/p>\n<h3>Th\u1ee7 t\u1ee5c ki\u1ec3m th\u1eed<\/h3>\n<ol>\n<li><strong>Ki\u1ec3m th\u1eed t\u1ea3i n\u1eb7ng:<\/strong>T\u1ed1i \u0111a h\u00f3a t\u1ea7n su\u1ea5t ng\u1eaft v\u00e0 t\u1ea3i c\u1ee7a v\u00f2ng l\u1eb7p ch\u00ednh \u0111\u1ec3 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n x\u1ea5u nh\u1ea5t.<\/li>\n<li><strong>Ph\u00e2n t\u00edch nh\u1eadt k\u00fd:<\/strong>So s\u00e1nh gi\u00e1 tr\u1ecb b\u1ed9 \u0111\u1ebfm v\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb tham chi\u1ebfu \u0111\u00e3 bi\u1ebft (v\u00ed d\u1ee5: b\u1ed9 sinh xung b\u00ean ngo\u00e0i).<\/li>\n<li><strong>Thu th\u1eadp t\u00edn hi\u1ec7u:<\/strong>Ghi l\u1ea1i s\u01a1 \u0111\u1ed3 th\u1eddi gian trong qu\u00e1 tr\u00ecnh ki\u1ec3m th\u1eed t\u1ea3i n\u1eb7ng \u0111\u1ec3 x\u00e1c nh\u1eadn s\u1ef1 v\u1eafng m\u1eb7t c\u1ee7a kho\u1ea3ng th\u1eddi gian xung \u0111\u1ed9t.<\/li>\n<\/ol>\n<p>N\u1ebfu s\u01a1 \u0111\u1ed3 th\u1eddi gian cho th\u1ea5y ISR th\u1ef1c thi ho\u00e0n to\u00e0n tr\u01b0\u1edbc khi V\u00f2ng l\u1eb7p ch\u00ednh truy c\u1eadp bi\u1ebfn, ho\u1eb7c bi\u1ebfn \u0111\u01b0\u1ee3c kh\u00f3a trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i, th\u00ec \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft.<\/p>\n<h2>\ud83d\udcdd Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong ph\u00e2n t\u00edch th\u1eddi gian<\/h2>\n<p>Ngay c\u1ea3 khi c\u00f3 s\u01a1 \u0111\u1ed3 th\u1eddi gian, c\u00e1c k\u1ef9 s\u01b0 v\u1eabn c\u00f3 th\u1ec3 hi\u1ec3u sai d\u1eef li\u1ec7u. M\u1ed9t s\u1ed1 l\u1ed7i ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 \u00e2m t\u00ednh gi\u1ea3 ho\u1eb7c d\u01b0\u01a1ng t\u00ednh gi\u1ea3.<\/p>\n<ul>\n<li><strong>B\u1ecf qua \u0111\u1ed9 dao \u0111\u1ed9ng (Jitter):<\/strong>Tr\u1ec5 m\u1ea1ng ho\u1eb7c sai l\u1ec7ch \u0111\u1ed3ng h\u1ed3 c\u00f3 th\u1ec3 khi\u1ebfn c\u00e1c c\u1ea1nh t\u00edn hi\u1ec7u d\u1ecbch chuy\u1ec3n m\u1ed9t ch\u00fat. M\u1ed9t s\u01a1 \u0111\u1ed3 t\u0129nh c\u00f3 th\u1ec3 kh\u00f4ng ghi nh\u1eadn \u0111\u01b0\u1ee3c s\u1ef1 bi\u1ebfn \u0111\u1ed5i n\u00e0y.<\/li>\n<li><strong>B\u1ecf qua c\u00e1c ch\u1ebf \u0111\u1ed9 n\u0103ng l\u01b0\u1ee3ng:<\/strong>B\u1ed9 x\u1eed l\u00fd trung t\u00e2m c\u00f3 th\u1ec3 chuy\u1ec3n sang c\u00e1c tr\u1ea1ng th\u00e1i ng\u1ee7 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng, l\u00e0m thay \u0111\u1ed5i th\u1eddi gian th\u1ef1c hi\u1ec7n l\u1ec7nh v\u00e0 th\u1eddi gian \u0111\u00e1nh th\u1ee9c ng\u1eaft.<\/li>\n<li><strong>S\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a tr\u00ecnh bi\u00ean d\u1ecbch:<\/strong>C\u00e1c m\u1ee9c t\u1ed1i \u01b0u h\u00f3a kh\u00e1c nhau (-O0 so v\u1edbi -O2) c\u00f3 th\u1ec3 thay \u0111\u1ed5i th\u1ee9 t\u1ef1 th\u1ef1c hi\u1ec7n l\u1ec7nh, l\u00e0m thay \u0111\u1ed5i th\u1eddi gian ch\u00ednh x\u00e1c c\u1ee7a \u0111o\u1ea1n m\u00e3 quan tr\u1ecdng.<\/li>\n<li><strong>\u0110\u1ed9 tr\u1ec5 ph\u1ea7n c\u1ee9ng:<\/strong>C\u00e1c \u0111\u1ed9 tr\u1ec5 c\u1ee7a thi\u1ebft b\u1ecb ngo\u1ea1i vi (v\u00ed d\u1ee5: th\u1eddi gian chuy\u1ec3n \u0111\u1ed5i ADC) th\u01b0\u1eddng kh\u00f4ng \u0111\u01b0\u1ee3c ph\u1ea3n \u00e1nh trong s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea7n m\u1ec1m nh\u01b0ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tr\u1ea1ng th\u00e1i t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n<h2>\ud83d\ude80 K\u1ebft lu\u1eadn v\u1ec1 ch\u1ea9n \u0111o\u00e1n<\/h2>\n<p>Ch\u1ea9n \u0111o\u00e1n t\u00ecnh tr\u1ea1ng c\u1ea1nh tranh y\u00eau c\u1ea7u s\u1ef1 chuy\u1ec3n d\u1ecbch t\u1eeb ph\u00e2n t\u00edch m\u00e3 t\u0129nh sang quan s\u00e1t t\u00edn hi\u1ec7u \u0111\u1ed9ng. S\u01a1 \u0111\u1ed3 th\u1eddi gian cung c\u1ea5p b\u1ed1i c\u1ea3nh c\u1ea7n thi\u1ebft \u0111\u1ec3 hi\u1ec3u c\u00e1ch th\u1eddi gian t\u01b0\u01a1ng t\u00e1c v\u1edbi logic trong m\u00f4i tr\u01b0\u1eddng song song. B\u1eb1ng c\u00e1ch so s\u00e1nh lu\u1ed3ng th\u1ef1c thi c\u1ee7a V\u00f2ng l\u1eb7p Ch\u00ednh v\u1edbi Th\u1ee7 t\u1ee5c ph\u1ee5c v\u1ee5 ng\u1eaft, th\u1eddi \u0111i\u1ec3m ch\u00ednh x\u00e1c c\u1ee7a s\u1ef1 h\u1ecfng d\u1eef li\u1ec7u s\u1ebd tr\u1edf n\u00ean r\u00f5 r\u00e0ng.<\/p>\n<p>Vi\u1ec7c gi\u1ea3i quy\u1ebft hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi l\u1ef1a ch\u1ecdn chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean kh\u1ea3 n\u0103ng ph\u1ea7n c\u1ee9ng v\u00e0 y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t. D\u00f9 th\u00f4ng qua c\u00e1c l\u1ec7nh nguy\u00ean t\u1eed, che khu\u1ea5t ng\u1eaft hay thi\u1ebft k\u1ebf l\u1ea1i ki\u1ebfn tr\u00fac, m\u1ee5c ti\u00eau v\u1eabn nh\u1ea5t qu\u00e1n: \u0111\u1ea3m b\u1ea3o tr\u1ea1ng th\u00e1i chung lu\u00f4n nh\u1ea5t qu\u00e1n b\u1ea5t k\u1ec3 th\u1eddi gian th\u1ef1c thi.<\/p>\n<p>Khi c\u00e1c thi\u1ebft b\u1ecb IoT tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p v\u00e0 k\u1ebft n\u1ed1i m\u1ea1ng ng\u00e0y c\u00e0ng nhi\u1ec1u, kho\u1ea3ng tr\u1ed1ng cho sai s\u00f3t ng\u00e0y c\u00e0ng thu h\u1eb9p. Ph\u00e2n t\u00edch th\u1eddi gian nghi\u00eam ng\u1eb7t kh\u00f4ng ch\u1ec9 l\u00e0 b\u01b0\u1edbc g\u1ee1 l\u1ed7i; n\u00f3 l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n then ch\u1ed1t trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang \u0111\u00e1ng tin c\u1eady.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong th\u1ebf gi\u1edbi ph\u1ee9c t\u1ea1p c\u1ee7a h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 ki\u1ebfn tr\u00fac Internet v\u1ea1n v\u1eadt (IoT), th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1; n\u00f3 l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c c\u01a1 b\u1ea3n quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ec7 th\u1ed1ng. Khi nhi\u1ec1u lu\u1ed3ng ho\u1eb7c ng\u1eaft c\u1ed1 g\u1eafng truy c\u1eadp c\u00e1c t\u00e0i nguy\u00ean chung c\u00f9ng l\u00fac, nguy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1551,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[44,47],"class_list":["post-1550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-timing-diagram"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ch\u1ea9n \u0111o\u00e1n c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh trong IoT b\u1eb1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian \u26a1<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch nh\u1eadn di\u1ec7n c\u00e1c l\u1ed7i \u0111\u1ed3ng b\u1ed9 trong h\u1ec7 th\u1ed1ng nh\u00fang b\u1eb1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian. 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