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To change XferSize in C++, the method
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BulkEndPoint->SetXferSize(DesiredValue); |
shall be used. Cypress sets DesiredValue to 4,096 bytes by default. This default value is not documented in the CyAPI.lib manual (pag 62 of CyAPI.pdf), but it has been retrieved by using the following C++ instructions:
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int XferSizeReadValue = BulkEndPoint->GetXferSize(); |
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cout<< "XferSizeReadValue" << XferSizeReadValue <<endl; |
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| title | data throughput as a function of XferSize given PacketSize = 102,400 bytes |
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XferSize
(bytes) | Throughput
(Mbyte/s) | Data throughput [Mbyte/s] as a function of XferSize [byte]
given PacketSize = 102,400 bytes. |
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PacketSize = 102,400
(bytes) | 
| 4,096 (1) | 15.6 | 8,192 | 20.4 | 16,384 | 26.3 | 32,768 | 30.2 | 65,536 | 34.1 | 131,072 | 36.2 | 262,144 | 36.7 |
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| title | data throughput as a function of PacketSize given XferSize = 102,400 bytes. |
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Packet Size
(bytes) | Throughput
(Mbyte/s) | Data throughput [Mbyte/s] as a function of PacketSize [byte]
given XferSize = 102,400 bytes |
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XferSize = 131,072
(Bytes) |  | 512 | 2.32 | 1,024 | 4.25 | 2,048 | 7.65 | 4,096 | 15.22 | 8,192 | 20.35 | 16,384 | 25.45 | 32,768 | 31.05 | 65,536 | 35.34 | 131,072 | 37.01 |
|
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Conclusion
If a higher throughput is desired,
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