我寫的程序比較簡單，初始化376，檢測U盤，打開固定文件，讀文件10000字節(jié)，關(guān)閉文件，這幾個(gè)函數(shù)順序執(zhí)行，可是我在用串口中斷方式讀取固定文件10000字節(jié)的時(shí)候，出現(xiàn)的情況如圖所示（由于讀文件是由讀塊組成的，圖中是我打印出的每次讀出的塊得長度），我對我讀出的數(shù)據(jù)有所懷疑，雖然字節(jié)總數(shù)是正確的，但是細(xì)看下，還有讀出來的是0字節(jié)或者2字節(jié)，我感覺自己可能讀錯(cuò)了，大家伙幫我分析下吧。

readblock -> s是讀塊函數(shù)返回的字節(jié)數(shù) 最后一行是打印的總數(shù)，及其最后一次返回的狀態(tài)碼

PM 03:42:34> readblock -> s = 255 PM 03:42:35> readblock -> s = 0 PM 03:42:35> readblock -> s = 255 PM 03:42:36> readblock -> s = 0 PM 03:42:36> readblock -> s = 2 PM 03:42:38> readblock -> s = 0 PM 03:42:38> readblock -> s = 255 PM 03:42:39> readblock -> s = 0 PM 03:42:39> readblock -> s = 255 PM 03:42:40> readblock -> s = 0 PM 03:42:40> readblock -> s = 2 PM 03:42:41> readblock -> s = 0 PM 03:42:41> readblock -> s = 255 PM 03:42:42> readblock -> s = 0 PM 03:42:42> readblock -> s = 255 PM 03:42:43> readblock -> s = 0 PM 03:42:43> readblock -> s = 2 PM 03:42:45> readblock -> s = 0 PM 03:42:45> readblock -> s = 255 PM 03:42:46> readblock -> s = 0 PM 03:42:46> readblock -> s = 255 PM 03:42:47> readblock -> s = 0 PM 03:42:47> readblock -> s = 2 PM 03:42:48> readblock -> s = 0 PM 03:42:48> readblock -> s = 255 PM 03:42:49> readblock -> s = 0 PM 03:42:49> readblock -> s = 255 PM 03:42:51> readblock -> s = 0 PM 03:42:51> readblock -> s = 2 PM 03:42:52> readblock -> s = 0 PM 03:42:52> readblock -> s = 255 PM 03:42:53> readblock -> s = 0 PM 03:42:53> readblock -> s = 255 PM 03:42:54> readblock -> s = 0 PM 03:42:54> readblock -> s = 2 PM 03:42:55> readblock -> s = 0 PM 03:42:55> readblock -> s = 255 PM 03:42:56> readblock -> s = 0 PM 03:42:57> readblock -> s = 255 PM 03:42:58> readblock -> s = 0 PM 03:42:58> readblock -> s = 2 PM 03:42:59> readblock -> s = 0 PM 03:42:59> readblock -> s = 255 PM 03:43:00> readblock -> s = 0 PM 03:43:00> readblock -> s = 255 PM 03:43:01> readblock -> s = 0 PM 03:43:01> readblock -> s = 2 PM 03:43:02> readblock -> s = 0 PM 03:43:02> readblock -> s = 255 PM 03:43:03> readblock -> s = 0 PM 03:43:03> readblock -> s = 255 PM 03:43:04> readblock -> s = 0 PM 03:43:04> readblock -> s = 2 PM 03:43:05> readblock -> s = 0 PM 03:43:06> readblock -> s = 255 PM 03:43:07> readblock -> s = 0 PM 03:43:07> readblock -> s = 255 PM 03:43:08> readblock -> s = 0 PM 03:43:08> readblock -> s = 2 PM 03:43:09> readblock -> s = 0 PM 03:43:09> readblock -> s = 255 PM 03:43:10> readblock -> s = 0 PM 03:43:10> readblock -> s = 255 PM 03:43:11> readblock -> s = 0 PM 03:43:11> readblock -> s = 2 PM 03:43:12> readblock -> s = 0 PM 03:43:12> readblock -> s = 255 PM 03:43:13> readblock -> s = 0 PM 03:43:13> readblock -> s = 255 PM 03:43:14> readblock -> s = 0 PM 03:43:14> readblock -> s = 2 PM 03:43:16> readblock -> s = 0 PM 03:43:16> readblock -> s = 255 PM 03:43:17> readblock -> s = 0 PM 03:43:17> readblock -> s = 255 PM 03:43:18> readblock -> s = 0 PM 03:43:18> readblock -> s = 2 PM 03:43:19> readblock -> s = 0 PM 03:43:19> readblock -> s = 255 PM 03:43:20> readblock -> s = 0 PM 03:43:20> readblock -> s = 255 PM 03:43:21> readblock -> s = 0 PM 03:43:21> readblock -> s = 2 PM 03:43:22> readblock -> s = 0 PM 03:43:22> readblock -> s = 255 PM 03:43:23> readblock -> s = 0 PM 03:43:23> readblock -> s = 255 PM 03:43:25> readblock -> s = 0 PM 03:43:25> readblock -> s = 2 PM 03:43:26> readblock -> s = 0 PM 03:43:26> readblock -> s = 255 PM 03:43:27> readblock -> s = 0 PM 03:43:27> readblock -> s = 255 PM 03:43:28> readblock -> s = 0 PM 03:43:28> readblock -> s = 2 PM 03:43:29> readblock -> s = 0 PM 03:43:29> readblock -> s = 255 PM 03:43:31> readblock -> s = 0 PM 03:43:31> readblock -> s = 255 PM 03:43:32> readblock -> s = 0 PM 03:43:32> readblock -> s = 2 PM 03:43:33> readblock -> s = 0 PM 03:43:33> readblock -> s = 255 PM 03:43:34> readblock -> s = 0 PM 03:43:34> readblock -> s = 255 PM 03:43:35> readblock -> s = 0 PM 03:43:35> readblock -> s = 2 PM 03:43:36> readblock -> s = 0 PM 03:43:36> readblock -> s = 255 PM 03:43:37> readblock -> s = 0 PM 03:43:38> readblock -> s = 255 PM 03:43:39> readblock -> s = 0 PM 03:43:39> readblock -> s = 2 PM 03:43:40> readblock -> s = 0 PM 03:43:40> readblock -> s = 255 PM 03:43:41> readblock -> s = 0 PM 03:43:41> readblock -> s = 17 PM 03:43:42> readblock -> s = 0 PM 03:43:42> ch376byteread() 0x14 <10000>

從你打印的信息上面看 255，2都是正確的，因?yàn)镃H376從U盤讀寫文件的時(shí)候 是分扇區(qū)的(512字節(jié))，但是字節(jié)方式單次只允許使用255字節(jié)，所以對CH376來說一個(gè)扇區(qū)需要分3次讀寫完成，即255+255+2，然后才可以對第二個(gè)扇區(qū)進(jìn)行操作。 程序中打印的0字節(jié) 是從哪邊來的？ 需要你查查程序。

_study_兄 我仔細(xì)檢查程序了，也不確定怎么著出來的0，我也相當(dāng)納悶~~~ 還有一個(gè)問題，請幫忙解決，我重新發(fā)一個(gè)帖子