USB device driver development

nagendramurthy — Mon, 12 Sep 2016 05:53:59 GMT

Hello Everyone,

I need to develop a USB device driver. this is first time i'm working on USB protocol.

Hardware information: this is a customized board using LPC1837 controller, which two USB ports. but we are using only one USB. i'm using CMSIS USB driver to develop the code.

Compiler information: keil 5 vision

Software Information: i'm using CMSIS USB driver to develop the code.

the problem what i'm facing is when i connect my device to PC it display a message saying unknown device connected. can anyone help me out to resolve this problem.

little information about the steps or procedure i have followed.

i have gone through the USB protocol. the protocol has 4 types of packets.

1. Token

2. Data

3. Handshake

4. SOF(start of frame).

i have been sending the information of DEVICE_DESCRIPTOR which contains PID and VID data, by setting the

below is the Token struct which is sending the data to PC

usb_Token.sync = 0x55;
usb_Token.pid=0x1E;
usb_Token.Addr = 0x01;
usb_Token.endpoint=0x01;
usb_Token.CRC5 =0x05;
usb_Token.EOP=00;

below is the data struct which is sending the data of device descriptor
usb_data.sync=0x55;
usb_data.pid=0xB4;
usb_data.Data = (uint8_t *)device0_dev_desc;
usb_data.CRC16 = 0x12;
usb_data.EOP=0x00;

both the above struct was send one after the other using CMSIS API called endpoint Transfer.

USBDDrv->EndpointTransfer(0x80,(uint8_t *)&usb_Token,6);

USBDDrv->EndpointTransfer(0x80,(uint8_t *)&usb_data,22);

if anyone need i can provide the code.

Re: USB device driver development

vicentegomez — Mon, 19 Sep 2016 17:48:18 GMT

Hi you can check the examples from the LPCOpen, normally this examples are installed on the following folder

C:\NXP\LPCXpresso_8.2.0_647\lpcxpresso\Examples\LPCOpen\lpcopen_2_18_lpcxpresso_nxp_lpcxpresso_1837.zip\LPCUSBlib_MassStorageHost

regards

Vicente Gomez

Re: USB device driver development

nagendramurthy — Tue, 20 Sep 2016 03:54:02 GMT

Hi Vicente,

I have gone through that example code. but my not getting when the data (packet) which contains PID and VID information should be sent.

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USB device driver development

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Re: USB device driver development