ARM Cortex-M3 系列处理器 的实验代码，内容很全，涉及片内和外围所有部件编程。（Keil环境）
-ARM Cortex-M3 family of processors experimental code, content is very wide, involving all the components and peripherals on-chip programming. (Keil environment)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001278s ]
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:0.093367s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001211s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001899s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001250s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003693s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001070s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003306s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015219s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001323s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 224548 [ RunTime:0.001173s ]
