topic Re: lpc4337 usb msc in LPC Microcontrollers

lpc4337 usb msc

lpcware — Wed, 15 Jun 2016 16:44:40 GMT

Content originally posted in LPCWare by snovik on Thu Feb 06 23:46:14 MST 2014
Hello!

1) Try this example Dual Hi-Speed USB Host/Device Solution. Removed all audio functions. Showed write speed 1 mb/s, reading level 4 mb/s. Is this the limit of performance for this controller?

2) What powered the controller? I put usb0 in computer usb slot and board' s pin 5V showed voltage 3.7V, and at pin 3.3V showed voltage 2.6V. Very large voltage drop is not known what is the reason?

Re: lpc4337 usb msc

lpcware — Wed, 15 Jun 2016 16:44:41 GMT

Content originally posted in LPCWare by tinyusb on Sat Feb 08 06:44:15 MST 2014
in my work with lpc43xx which is also MSC host on USB0, a transfer of the chunk of 8k is transmitted in 398.334 us (micro second), which is ~ 8192 Byte / 398.334 = 20.56 Byte/us = 164.52 Mbps. The usb controller is definitely able to transfer at high speed.

[img]http://www.lpcware.com/system/files/lpc4357_bulk_0.png[/img]

http://www.lpcware.com/content/forum/help-sending-bulkdata-10mbits-using-usb-cdc-device-class-lpc-4330

Re: lpc4337 usb msc

lpcware — Wed, 15 Jun 2016 16:44:41 GMT

Content originally posted in LPCWare by snovik on Sat Feb 08 07:44:41 MST 2014
I turned off the recording on the card, and the speed increased to 160 mbit/s. Write operation on the card so much slowed.

Re: lpc4337 usb msc

lpcware — Wed, 15 Jun 2016 16:44:42 GMT

Content originally posted in LPCWare by tinyusb on Mon Feb 10 08:59:00 MST 2014
Edit:

Quote:
I turned off the recording on the card, and the speed increased to 160 mbit/s. Write operation on the card so much slowed.

Opps, I previously does not look at your comment carefully. Indeed the SDCard speed is very low comparing to usb