DIO280巴赫曼
DIO280 CY7C68033的PA3～PA2引腳作為地址線與TMS320DM6437 DSP的HCNTL［1:0］相連，用于選擇HPI的寄存器與工作模式；FD［15:0］作為16位數據總線與HPl的數據總線HD［15:0］相連，用于交換數據；CTLx引腳為GPIF的輸出控制信號，RDYO引腳為GPIF的輸入控制信號。由于訪問HPI寄存器需兩次半字傳輸，因此使用 CY7C68033的CTL0引腳進行控制。TMS320DM6437的HR／W接至CTL1，用來作為讀／寫選擇標志；HDS1與CTL2相連，作為數據選通信號。HRDY與輸入信號線RDYO相連，用于查詢HPI接口狀態(tài)，GPIF通過監(jiān)測該信號以控制內部存取操作。TMS320DM6437的 HINT與CY7C68033的INT0引腳相連，DSP復位時HINT引腳啟用，該引腳也用于DSP向CY7C68033發(fā)送外部中斷請求。另外，TMS320DM6437的HCS3引腳接地表示可對HPI進行連續(xù)存取操作。
3 圖像采集系統(tǒng)軟件設計
當USB設備插入計算機時，計算機和USB設備之間產生一個枚舉過程。計算機檢測到有設備插入。自動發(fā)出查詢請求；USB設備回應該請求，發(fā)送出該設備的 Vendor ID和Product ID；計算機根據這兩個ID裝載相應設備驅動程序，完成枚舉過程。然后就可以傳輸數據，接收數據，即TMS320DM6437 DSP向PC機傳輸數據時，首先向CY7C68033發(fā)送一硬件中斷信號，CY7C68033接收該中斷，并啟動接收程序，通過HPI接口設置DSP的 HPIC寄存器的HINT標志位，使DSP下一次仍通過該位發(fā)出中斷：然后通過端口6將固定長度（512字節(jié)）的數據讀人FIFO：端口6讀取數據時，為了保證較高的傳輸速度，CY7C68033中的CPU不能干預數據傳輸，當FIFO中的數據達到一定數量后，CY7C68033自動將數據打包傳送給 USB總線；發(fā)送數據時，它將數據包直接傳輸給CY7C68033，CY7C68033接收到數據后，按字節(jié)長度將數據讀到發(fā)送端口2的FIFO中，然后自動啟動GPIF，將數據傳送給DSP，接下來CY7C68033通過HPI接口設置DSP的HPIC寄存器中的DSPINT位（將其置1），向 DSP發(fā)送請求中斷，通知DSP有數據包。
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