Pilz pnoz s6.1 s61 750156 目標機要從主機中獲得數據，首先必須設定一個輸入通道ichanCmd，來接受主機發出的命令，從而實現數據傳輸的同步。運行中，系統可通過用戶接口發送一個讀取數據的請求，并將這個請求保存在RTDX目標機的緩存中，然后通過JTAG接口發送到主機。同時應由COM automation client通過COM接口把要發送的數據先寫入到RTDX主；帆函數庫中的緩存，以等待目標機讀取數據的請求。當RTDX主機函數庫收到從目標機發出的讀取數據請求時，保存在RTDX主機函數庫中的數據便可通過JTAG接口將數據發送到目標機，從而使該數據可以實時寫入目標機的存儲區域。操作完成后，主機會通知RTDX目標機函數庫。
2．3 RTDX目標機函數庫的用戶接口和COM接口
利用RTDX目標機函數庫的用戶接口可實現在目標機DSP應用程序和主機之間進行安全可靠的數據交換。同時可利用它完成應用程序向RTDX主機庫發送數據、應用程序向RTDX主機庫發送數據請求以及在目標機上提供數據緩存等功能。另外，數據發送前應先將數據拷貝到目標機緩存中，以減少對應用程序實時性的影響。 RTDX主機庫中的COM接口可用來確定COM automation client與RTDX主機函數庫的通信方式。而通過COM automation client可訪問保存在RTDX lox文件或BTDX主機函數庫緩存中的數據。同時COM automation client也可通過RTDX主機函數庫向應用程序發送數據。
2．4 RTDX模式
RTDX主機函數庫提供了兩種接受目標機數據的模式：第一種是非連續模式，在這種模式中，數據通常存到主機的log文件中。該模式一般應用于非實時處理情況下，可在事后分析保存在log文件中的數據。第二種是連續模式，在這種模式中，數據不寫入log文件，而是由RTDX主機函數庫緩存，它一般應用在實時情況下。
3 基-ZRTDX的視頻數據傳輸
在程序調試時，筆者利用RTDX技術在主機上顯示采集圖像處理后的結果以驗證算法的性能，并通過設定主機與目標機的握手信號來在主機上實現動態的視頻顯示。
考慮到數據傳輸都由JTAG接口完成而且圖像數據量很大，調試中往往采用將512X512圖像每4個相鄰像素取一個點的方法來將分辨率降為128X128，因為減少數據量可提高顯示幀頻。當數據通過RTDX通道傳到主機時，128X128的圖像數據可通過每個像素擴展成4個相鄰的像素來恢復圖像。最后通過VC的位圖顯示函數來顯示圖像結果。圖2所示是其視頻數據流示意圖。
為了使主機與目標機之間能正確地傳送和接受數據，主機應用程序和目標機應用程序都要嵌入支持RTDX的APl函數。下面詳細介紹兩者之間的操作流程。
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