51单片机串口数据包收发程序，能一次收发多个字节，可跟据需要自行修改字节长度，并且具有接收超时判断功能。-51 Single-chip serial data packets to send and receive procedures, can send and receive more than one byte can be modified according to the needs of self-byte length, and have to receive overtime to determine function.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001227s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.077612s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001233s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001111s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000927s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003434s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000801s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003677s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014794s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001184s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 117381 [ RunTime:0.012248s ]
