communicating with a LPC1768 as a HID via python -


background: evaluating replacing ftdi+fpga+ram cortex chip , playing around lpc1768 dev card.

flashing led? [x] communications via virtual comms port [x]

now looking @ communicating via libusb (either cdc or hid... evaluating)

i started trying example: https://developer.mbed.org/cookbook/usbhid-bindings- & usbhid_testcase program compiles , runs.

the issue on python side (using linux example & libusb).

the 1st issue py script has:

mbed_vendor_id = 0x1234  mbed_product_id = 0x0006

equally mbed usbdevice:usbhid has:

usbhid(uint8_t output_report_length = 64, uint8_t input_report_length = 64, uint16_t vendor_id = 0x1234, uint16_t product_id = 0x0006, uint16_t product_release = 0x0001, bool connect = true);

ie same product , vendor id. however... lsusb lists nxp chipset @ different location. 

bus 003 device 008: id 0d28:0204 nxp lpc1768

issuing: lsusb -vvv -d 0x0d28:0204 can see 4 devices card exposes (good) , matched simple python testcase

import usb mbed_vendor_id = 0x0d28 mbed_product_id = 0x0204 dev = usb.core.find(idvendor=mbed_vendor_id,idproduct=mbed_product_id)

checking dev populated with: 

dev[0] <configuration 1: 500 ma>   dev[0][(0,0)] <interface 0: mass storage> [0] <endpoint 0x82: bulk in> [1] <endpoint 0x2: bulk out> [2] <endpoint 0x0: control out>   dev[0][(1,0)] <interface 1: cdc communication> [0] <endpoint 0x83: interrupt in> [1] <endpoint 0x0: control out>  dev[0][(2,0)] <interface 2: cdc data> [0] <endpoint 0x4: bulk out> [1] <endpoint 0x84: bulk in> [2] <endpoint 0x0: control out>   dev[0][(3,0)] <interface 3: human interface device> [0] <endpoint 0x81: interrupt in> [1] <endpoint 0x1: interrupt out> [2] <endpoint 0x0: control out>

so 0 mass storage -> python script example wouldn't work. have been trying communicate via dev[0][3,0] , specifying endpoint dev[0][3,0][0] can write reads dev[0][3,0][1] return 0's though mbed code meant provide random data.

any idea's ?

the usb test case code uses usb controller on lpc1768 ic, not mbed board's interface chip. code uses pin 31 , 32 on mbed board. hope helps.


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:...
Read more