topic LPC1769 LPCXpresso and USB example in LPCXpresso IDE

LPC1769 LPCXpresso and USB example

lpcware — Wed, 15 Jun 2016 23:52:06 GMT

Content originally posted in LPCWare by JojoS on Sat May 21 08:01:58 MST 2011
dear LPC users, I'm new to the LPC's and still checking some examples. I use the Board from EmbeddedArtists together with their BaseBoard to connect Ethernet, USB and other. Some examples are running, but I got also some that were written for other hardware from CodeRed or Keil.
I was able to run the current FreeRTos 7.0.1 version by changing the code for the different phy hardware. Now I want to get a USB host running and found the Keil example 'usbmem'. But here I'm not successfull. The code compiles and I've set different breakpoints, but I get only an USB_Reset_Event when connecting an USB memory stick, no other events.
What is missing? I checked the hardware drawings and set jumpers for terminating the USB lines, but then I get not even the reset event. I use only the USB host connector, the parallel USB device Interface is disconnected. The EA board has an output connected to a transistor to turn 3.3 V on the DP line, what should be done with this output? Keeping this line low changes nothing.
What else can I check?

Re: LPC1769 LPCXpresso and USB example

lpcware — Wed, 15 Jun 2016 23:52:06 GMT

Content originally posted in LPCWare by Rob65 on Sat May 21 08:26:00 MST 2011
Did you connect an external 5V supply?
You need to connect a 5V supply to Vin - a convenient way to do this is through the USB-UART bridge - I made the same problem when playing with the RGB LED, some peripherals need external 5V which is not supplied through the LPC-Link part of the board.

Also do not forget to insert the jumpers in J61 and do not use the USB device connector (X1, next to the USB-A connector) since these share the same USB signals.

Next thing to do is to use the correct program; usbmem is a memory device, not a host. Please download the lpc1768 sample applications from the Embedded Artists support site (link) there you will find the usbhostlite application ready for the LPCXpresso environment.
That should work.

Regards,

Rob

Re: LPC1769 LPCXpresso and USB example

lpcware — Wed, 15 Jun 2016 23:52:07 GMT

Content originally posted in LPCWare by Rob65 on Sat May 21 08:41:18 MST 2011
Another way of getting 5V to your board is by soldering a wire between the SB-VBUS line of the LPC-Link and the Vin pin of the board - see attached photo.

Please note that this will also power the LPC-link when you connect the board through the USB-Uart or USB-Device connector, something you may not want to ...

Regards,

Rob

Re: LPC1769 LPCXpresso and USB example

lpcware — Wed, 15 Jun 2016 23:52:08 GMT

Content originally posted in LPCWare by JojoS on Sat May 21 08:50:54 MST 2011
thanks Rob,
yes power is supplied thru -x3 and nothing is connected to -x1. I had the other samples already and found the usbhostlite also. Now it reads my memory stick and reports FAT ok. This is really great stuff!