CMSIS: Slow file transfer while using FTP Server example in Keil MDK 5

Information in this knowledgebase article applies to:

• Keil MDK v. 5.15 and later
• Keil µVision IDE v. 5.15.0.0 and later
• ARM Compiler 5 (Armcc) v. 5.05u2 (build 169) and later
• Keil MDK Middleware v. 6.4.0 and earlier
• CMSIS-Pack v. 4.3.0 and later
• Compiler Pack v. 1.0.0 and later

Question

I am using the FTP-Server example based on the old RL-Flash library for LPC1700_DFP in Keil MDK 4 and the file transfer speed was around 600-700 kb/s.

But, while using FTP-Server example based on new CMSIS-Pack library in Keil MDK 5, the speed of file transfer reduces to 200-300 kb/s.

What can I do to improve the speed of file transfer?

ANSWER

This issue is resolved in the next release of Middleware Version 6.5.0.

However, this performance also depends on many factors such as the type of memory card (SD Card or MMC), number of files already present on the card etc.

MORE INFORMATION

• Refer to MDK Version 5 - Middleware
• Refer to MDK5 Software Packs

Last Reviewed: Wednesday, February 24, 2021