LPCXpresso IDE中的主题 Re: USBHID in LPC1769

USBHID in LPC1769

lpcware — Thu, 16 Jun 2016 00:22:00 GMT

Content originally posted in LPCWare by Sudee on Thu Nov 28 04:44:42 MST 2013
0:) hello.

i am sudeep,

I have designed the usb based data acquisition using the lpc1769 and a 16 bit ADC using lpc1769 as an usbhid device with FULL SPEED Operation.

I am using the labview to send command to the lpc1769 device to start , get the adc data from the device and stop the operation.

All my IN and OUT transactions are based on the INTERRUPT ENDPOINT 1.

I set the data bytes for the OUT EP WITH 20 byes and IN EP with the 2 bytes only.

As my ADC data is 16 bit (i.e 2 bytes ) and the USB configured for the 8bits mode so i need to send the 16 bit by splitting it to 2bytes.

the device is getting the commands from the PC correctly but the IN endpoint is seems to be not working properly
in the sense that

by keeping the lpc1769 in the debug mode and continuous exec mode

if i give sampling rate as 1000hz or 1kz and number of samples will be 10 points then for each second i need to get 100 samples from the

usb device but i am getting only about 20 samples on the PC side.

but if i run with the breakpoints i am getting the exact 100 samples

why its so and where may be the problem...........? whether on the usb device side or PC program side?

In my code i cant put delay between the each USBWriteEP fuction call as it is going to affect the speed of the ADC samples collection..

please help me.

and also how i can trace the speed of data sent by the USB device ?

regards

regards

Re: USBHID in LPC1769

lpcware — Thu, 16 Jun 2016 00:22:01 GMT

Content originally posted in LPCWare by Pacman on Thu Nov 28 05:29:27 MST 2013

Quote: Sudee
I am using the LPC1769 controller on an our own designed dev.board.
if i detached the debugger and reset the dev.board that time my device (1769) is not enumerating

I have no idea, except maybe just a shot in the dark... Did you remember to place a pull-up resistor between ~RESET and VCC (and of course a 100nF from GND to ~RESET) ?

Re: USBHID in LPC1769

lpcware — Thu, 16 Jun 2016 00:22:02 GMT

Content originally posted in LPCWare by Sudee on Fri Nov 29 02:43:14 MST 2013
hi,

I made the RESET circuit and tested the dev.board.

Now it gets enumerating by the
Windows 7 perfectly that too on some PC's only, not by all the PC's running windows 7 why it's So.

regards

Re: USBHID in LPC1769

lpcware — Thu, 16 Jun 2016 00:22:02 GMT

Content originally posted in LPCWare by Sudee on Sun Dec 08 23:57:54 MST 2013
hello,
ist sudee
my usb device is correctly enumerated by the windows 7

when i burn the program Example_GebericHIDDevice on my 1769 and run with the break point at ISR , after enumeration process if i send data from the pc through the hidclient.exe software i.e.
LED glowing information ,....the device is not interrupted i.e. i can say that device is not recieving the LED information what may be the problems or whether i need to do any change in the code please reply me back

regards