CC2540: USB module Manufacturer string and product string didn't work

user3862598

Part Number: CC2540

Hello guys,

I have an issue with the CC2540 USB module. The manufacturer string and the product string are not working properly.

I found the file usb_hid_descriptor.s51 has this code:

;; String descriptors
string0Desc: ; Language ID
DB string0DescEnd - string0Desc ; bLength
DB DESC_TYPE_STRING ; bDescriptorType
DW 0409H ; wLangID (English-US)
string0DescEnd:

string1Desc: ; Manufacturer
DB string1DescEnd - string1Desc ; bLength
DB DESC_TYPE_STRING ; bDescriptorType
DB 'T', 0 ; unicode string
DB 'e', 0
DB 'x', 0
DB 'a', 0
DB 's', 0
DB ' ', 0
DB 'I', 0
DB 'n', 0
DB 's', 0
DB 't', 0
DB 'r', 0
DB 'u', 0
DB 'm', 0
DB 'e', 0
DB 'n', 0
DB 't', 0
DB 's', 0
string1DescEnd:

string2Desc: ; Product
DB string2DescEnd - string2Desc ; bLength
DB DESC_TYPE_STRING ; bDescriptorType
DB 'U', 0 ; unicode string
DB 'S', 0
DB 'B', 0
DB ' ', 0
DB 'C', 0
DB 'C', 0
DB '2', 0
DB '5', 0
DB '4', 0
DB '0', 0
DB ' ', 0
DB 'H', 0
DB 'I', 0
DB 'D', 0
string2DescEnd:

; To enable multiple HID dongles to connect to a PC,
; program a unique serial number for each dongle.
string3Desc: ; Serial Number
DB string3DescEnd - string3Desc
DB DESC_TYPE_STRING ; bDescriptorType
DB '0', 0
DB '0', 0
DB '1', 0
string3DescEnd:
usbDescEnd:

But in the file usb_standard_requests.c, about the function usbsrGetDescriptor(void), there is a line in the comment:

INDEX: 0, or language ID for string descriptors (currently not supported)

I am a bit confused, what should I do to make the string work properly? I ran the example of HIDAdvRemoteDongle, the strings didn't work.

Regards

over 8 years ago

0 J Lindh over 8 years ago

TI__Guru 57865 points

Hi,
I am not certain you should fiddle around with that code, and as you mentioned it might be unsupported anyway. What are you trying to achieve?

0 user3862598 over 8 years ago in reply to J Lindh

Prodigy 40 points

Thanks, Joakim.

I made a gamepad using the USB module of the CC2540. But the gamepad is visible in Windows 10 as "4 axis 12 button device". I need the device to be visible as "Custom Name" the same way as USB HID devices.

I tried, but I failed.

0 J Lindh over 8 years ago in reply to user3862598

TI__Guru 57865 points

Hi,
The USB HID implementation is not that straight forward. Are you able to use the advanced remote and dongle out of the box?

0 user3862598 over 8 years ago in reply to J Lindh

Prodigy 40 points

No, I'm not.

I want to design a gamepad that can switch between USB and BLE. Actually, it is already working, I can chose USB or BLE. But for the USB module, only the above issue has not been resolved.

Regards

0 J Lindh over 8 years ago in reply to user3862598

TI__Guru 57865 points

Hi again,
I am sorry although I have no further guidance to be honest.

0 user3862598 over 8 years ago in reply to J Lindh

Prodigy 40 points

No problem and thank you for your reply.

I think the problem located in the framework code of the USB module. Although it works, there is still room for improvement.

I believe that the device supports this function, but the framework code is not implemented, or implemented, but there is a problem, so the string cannot be expressed.

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CC2540: USB module Manufacturer string and product string didn't work