USB Data Transfer using LPC4370

vxs187 — Mon, 04 Mar 2019 17:23:23 GMT

NOTE: I AM USING A WINDOWS COMPUTER WITH AN INTEL I7 PROCESSOR

USB CONNECTIVITY AND DATA TRANSFER ISSUES

These are the approaches I have followed to get the USB connection this far:

I tried connecting the micro USB of the LPC to one of the COM ports of the computer. I ran the simple USB program which have been given in the examples in the debugger mode, and tried to connect with the MCU, with the host program running (written on python).
I tried to upload the MCU program on flash memory and further, connected just the evaluation board and then, ran the host program.

On both cases, I find the program on the MCU side getting stuck in the stage where it tries to check if the connection has been enabled. I am also sending you the copy of the codes I am using on both the MCU side as well as the host side.

PS: I have also tried running the program on the host side using other programming languages such as C and C# initially using the libusb and libusbdotnet libraries, both when run, give me the same error on the MCU side as I have already mentioned in the other messages we’ve conversed about – gets stuck on the checking for connection loop.

PROGRAM ON MCU and HOST SIDE:

MCU SIDE PROGRAM

#include "board.h"

#include <stdio.h>

#include <string.h>

#include "libusbdev.h"

/* The size of the packet buffer. */

#define PACKET_BUFFER_SIZE 4096

/* Application defined LUSB interrupt status */

#define LUSB_DATA_PENDING _BIT(0)

/* Packet buffer for processing */

static uint8_t g_rxBuff[PACKET_BUFFER_SIZE];

int main(void)

{

/* Initialize board and chip */

SystemCoreClockUpdate();

Board_Init();

/* Init USB subsystem and LibUSBDevice */

libusbdev_init(USB_STACK_MEM_BASE, USB_STACK_MEM_SIZE);

while (1) {

/* wait until host is connected */

while (libusbdev_Connected() == 0) {

/* Sleep until next IRQ happens */

__WFI(); à Gets stuck in this loop, libusbdev_Connected() always is 0.

}

while (libusbdev_Connected()) {

if (libusbdev_QueueReadDone() != -1) {

/* Dummy process read data ......*/

/* requeue read request */

libusbdev_QueueReadReq(g_rxBuff, PACKET_BUFFER_SIZE);

}

if (libusbdev_QueueSendDone() == 0) {

/* Queue send request */

libusbdev_QueueSendReq(g_rxBuff, PACKET_BUFFER_SIZE);

}

PROGRAM ON HOST SIDE:

Since I am using python, the program is quite easy to understand. Here, dev is the device that’s found using the “find” function of the usb.core - library.

dev1 = usb.core.find(idVendor = 0x1fc9, idProduct = 0x0090)

>>> print(dev1)

OUTPUT:

DEVICE ID 1fc9:0090 on Bus 001 Address 027 =================

bLength : 0x12 (18 bytes)

bDescriptorType : 0x1 Device

bcdUSB : 0x200 USB 2.0

bDeviceClass : 0xef Miscellaneous

bDeviceSubClass : 0x2

bDeviceProtocol : 0x1

bMaxPacketSize0 : 0x40 (64 bytes)

idVendor : 0x1fc9

idProduct : 0x0090

bcdDevice : 0x100 Device 1.0

iManufacturer : 0x1 NXP Semiconductors

iProduct : 0x2 LPC-LINK2 DATA PORT

iSerialNumber : 0x3 I3FWNUOV

bNumConfigurations : 0x1

CONFIGURATION 1: 500 mA ==================================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x2 Configuration

wTotalLength : 0xab (171 bytes)

bNumInterfaces : 0x5

bConfigurationValue : 0x1

iConfiguration : 0x0

bmAttributes : 0x80 Bus Powered

bMaxPower : 0xfa (500 mA)

INTERFACE 0: Human Interface Device ====================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x4 Interface

bInterfaceNumber : 0x0

bAlternateSetting : 0x0

bNumEndpoints : 0x2

bInterfaceClass : 0x3 Human Interface Device

bInterfaceSubClass : 0x0

bInterfaceProtocol : 0x0

iInterface : 0x4 Error Accessing String

ENDPOINT 0x81: Interrupt IN ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x81 IN

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x4

ENDPOINT 0x1: Interrupt OUT ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x1 OUT

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x4

INTERFACE 4: Human Interface Device ====================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x4 Interface

bInterfaceNumber : 0x4

bAlternateSetting : 0x0

bNumEndpoints : 0x2

bInterfaceClass : 0x3 Human Interface Device

bInterfaceSubClass : 0x0

bInterfaceProtocol : 0x0

iInterface : 0x7 Error Accessing String

ENDPOINT 0x84: Interrupt IN ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x84 IN

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x1

ENDPOINT 0x4: Interrupt OUT ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x4 OUT

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x1

INTERFACE 1: CDC Communication =========================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x4 Interface

bInterfaceNumber : 0x1

bAlternateSetting : 0x0

bNumEndpoints : 0x1

bInterfaceClass : 0x2 CDC Communication

bInterfaceSubClass : 0x2

bInterfaceProtocol : 0x0

iInterface : 0x5 Error Accessing String

ENDPOINT 0x83: Interrupt IN ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x83 IN

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x10 (16 bytes)

bInterval : 0x4

INTERFACE 2: CDC Data ==================================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x4 Interface

bInterfaceNumber : 0x2

bAlternateSetting : 0x0

bNumEndpoints : 0x2

bInterfaceClass : 0xa CDC Data

bInterfaceSubClass : 0x0

bInterfaceProtocol : 0x0

iInterface : 0x5 Error Accessing String

ENDPOINT 0x2: Bulk OUT ===============================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x2 OUT

bmAttributes : 0x2 Bulk

wMaxPacketSize : 0x200 (512 bytes)

bInterval : 0x0

ENDPOINT 0x82: Bulk IN ===============================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x82 IN

bmAttributes : 0x2 Bulk

wMaxPacketSize : 0x200 (512 bytes)

bInterval : 0x0

INTERFACE 3: Human Interface Device ====================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x4 Interface

bInterfaceNumber : 0x3

bAlternateSetting : 0x0

bNumEndpoints : 0x2

bInterfaceClass : 0x3 Human Interface Device

bInterfaceSubClass : 0x0

bInterfaceProtocol : 0x0

iInterface : 0x6 Error Accessing String

ENDPOINT 0x85: Interrupt IN ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x85 IN

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x40 (64 bytes)

bInterval : 0x2

ENDPOINT 0x5: Interrupt OUT ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x5 OUT

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x40 (64 bytes)

bInterval : 0x2

>>> cfg =devs.set_configuration() -> Sets the configuration to active mode.

>>> intf = cfg[(0,0)] -> This is the interface, here interface 0.

>>> print(intf)

OUTPUT:

INTERFACE 0: Human Interface Device ====================

bLength : 0x9 (9 bytes)

bDescriptorType : 0x4 Interface

bInterfaceNumber : 0x0

bAlternateSetting : 0x0

bNumEndpoints : 0x2

bInterfaceClass : 0x3 Human Interface Device

bInterfaceSubClass : 0x0

bInterfaceProtocol : 0x0

iInterface : 0x4 Error Accessing String

ENDPOINT 0x81: Interrupt IN ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x81 IN

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x4

ENDPOINT 0x1: Interrupt OUT ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x1 OUT

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x4

>>> ep = usb.util.find_descriptor( intf, custom_match = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT)

>>> print(ep)

OUTPUT:

ENDPOINT 0x1: Interrupt OUT ==========================

bLength : 0x7 (7 bytes)

bDescriptorType : 0x5 Endpoint

bEndpointAddress : 0x1 OUT

bmAttributes : 0x3 Interrupt

wMaxPacketSize : 0x400 (1024 bytes)

bInterval : 0x4

>>> ep.write('test')

ERROR:

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "C:\Users\viswe\AppData\Local\Programs\Python\Python37-32\lib\site-packages\usb\core.py", line 387, in write

return self.device.write(self, data, timeout)

File "C:\Users\viswe\AppData\Local\Programs\Python\Python37-32\lib\site-packages\usb\core.py", line 948, in write

self.__get_timeout(timeout)

File "C:\Users\viswe\AppData\Local\Programs\Python\Python37-32\lib\site-packages\usb\backend\libusb1.py", line 842, in intr_write

timeout)

File "C:\Users\viswe\AppData\Local\Programs\Python\Python37-32\lib\site-packages\usb\backend\libusb1.py", line 920, in __write

_check(retval)

File "C:\Users\viswe\AppData\Local\Programs\Python\Python37-32\lib\site-packages\usb\backend\libusb1.py", line 595, in _check

raise USBError(_strerror(ret), ret, _libusb_errno[ret])

usb.core.USBError: [Errno 5] Input/Output Error

I have tried to do everything from either side, but I haven’t understood why this is not working.

I am trying to use the dotnet libusb library again to find if that works, if I had done something wrong in the first trial.

Please let me know if you find I have understood something conceptually wrong. I am really concerned about the time I am spending on the USB connectivity problem, any help from your side is really appreciated.

Re: USB Data Transfer using LPC4370

Hui_Ma — Thu, 07 Mar 2019 06:50:13 GMT

Hi,

First of all, sorry for the later reply.

I did a test with [usbd_rom_libusb] example of lpcopen_3_02_keil_iar_lpclink2_4370 software package with LPC-Link2 board.

Below is my pc info for your reference:

I downloaded [Zadig] v2.0.1 (Build 160) from here.

When I plug in LPC-Link2 board, I could find below device at PC device management:

If I replace WinUSB at Zadig and install the driver.

There will make below change:

For I don't have the LibusbK host side applications, I couldn't do related test.

If you have the same behavior as my test?

Thanks for the attention.

Have a great day,
Mike

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

topic USB Data Transfer using LPC4370 in LPC Microcontrollers

USB Data Transfer using LPC4370

Re: USB Data Transfer using LPC4370

Re: USB Data Transfer using LPC4370