Universal serial port bus data transportation processing method
A universal serial bus and data transmission technology, which is applied in the field of universal serial bus data transmission, can solve problems such as difficult to meet the requirements of fast and efficient data transmission, and achieve the effect of increasing data transmission speed, increasing the number of data transmission, and efficient transmission
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[0028] The USB data transmission processing method adopted in the present invention scans the ED and TD chains in the HCD in the SOF interrupt, and finds the TD with data to be transmitted; the adaptation layer fills the relevant data information in the TD into at least two BDs within one frame At the same time, the status flag bit R of the filled BD is set to 1; the HC scans the BD with the R bit set to 1 in this frame; in the next frame, the HC performs data transmission according to the data information in the BD.
[0029] Therefore, in the present invention, the adaptation layer fills at least two BDs in one frame. When the HC performs data transmission, it needs to ensure the correctness of the transmitted data. However, according to the processing method when the BD return status is NAK in the prior art, when a When the BD returns the status as NAK, the HC does not stop the data transmission in this frame, and continues to read the relevant data information from the next ...
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