[libusb] Issue with FTDI601 Bulk Transfers - LIBUSB_ERROR_TIMEOUT

[eric t. <et...@ou...>]

Hi all,

I have working hardware with a FTDI601 chip.

Using FTDI's libraries (which use libusb) I have no problem reading and writing using FT_ReadPipe and FT_WritePipe.

However, the end application is to run on a ARM processes, which is not supported by FTDI. So I will be calling libusb directly.

I am able to do libusb_transfer_control to read and write to the FTDI configuration EEPROM,
I am trying to to libusb_bulk_transfers using enpoint 0x82 but get the LIBUSB_ERROR_TIMEOUT every time.

Code:
_______________________________________________________________
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <libusb-1.0/libusb.h>

#define BULK_EP_OUT 0x02
#define BULK_EP_IN  0x82

#define VID     0x0403
#define PID     0x601F

#define READ_BUFFER_SIZE 1024

int main ( int argc, char *argv[] )
{
        int ret,iface;
        struct libusb_device_handle *handle = NULL;
        libusb_device *dev;
        struct libusb_config_descriptor *desc;
        int interfaces;

        unsigned char read_buffer[READ_BUFFER_SIZE];
        int bytes_received;

        ret = libusb_init(NULL);
        if(ret < 0 )
        {
                printf("\nFailed to init\n");
                return -1;
        }

        handle = libusb_open_device_with_vid_pid(NULL, VID, PID);
        if( handle == NULL )
        {
                printf("Could not open device\n");
        }

        dev = libusb_get_device(handle);
        libusb_get_config_descriptor(dev,0, &desc);
        interfaces = desc->bNumInterfaces;
        libusb_free_config_descriptor(desc);

        libusb_set_auto_detach_kernel_driver(handle,1);

        for(iface = 0; iface < interfaces; iface++ )
        {
                printf("\nClaiming interface %d..\n",iface);
                ret = libusb_claim_interface(handle, iface);
                if ( ret != LIBUSB_SUCCESS )
                {
                        printf("   Failed, could not claim interface: %d\n",iface);
                }

        }

        libusb_clear_halt(handle, BULK_EP_OUT);
        libusb_clear_halt(handle, BULK_EP_IN);

        while(1)
        {
                ret = libusb_bulk_transfer(handle, BULK_EP_IN, &read_buffer[0], 4, &bytes_received, 100);
                if ( ret < 0 )
                {
                        printf("Bulk transfer failed, error code: %d\n",ret);
                        printf("Did we receive any bytes? bytes_received: %d\n",bytes_received);

                }
                else
                {
                        printf("Bulk read successful\n");
                }
        }

        return 0;
}

______________________________________________________________


when running here is the output:

Claiming interface 0..

Claiming interface 1..
Bulk transfer failed, error code: -7
Did we recive any bytes? bytes_recived: 0
Bulk transfer failed, error code: -7
Did we recive any bytes? bytes_recived: 0
Bulk transfer failed, error code: -7
Did we recive any bytes? bytes_recived: 0


here is what usbmon shows while running:
ffffffc18f5d5d80 623043173 S Co:2:030:0 s 02 01 0000 0002 0000 0
ffffffc18f5d5d80 623043710 C Co:2:030:0 0 0
ffffffc1a6d20b40 623043748 S Co:2:030:0 s 02 01 0000 0082 0000 0
ffffffc1a6d20b40 623043998 C Co:2:030:0 0 0
ffffffc1a6d20b40 623044073 S Bi:2:030:2 -115 4 <
ffffffc1a6d20b40 623144606 C Bi:2:030:2 -2 0
ffffffc1a6d20b40 623144951 S Bi:2:030:2 -115 4 <
ffffffc1a6d20b40 623245446 C Bi:2:030:2 -2 0
ffffffc1a6d20b40 623245687 S Bi:2:030:2 -115 4 <
ffffffc1a6d20b40 623346160 C Bi:2:030:2 -2 0
ffffffc1a6d20b40 623346394 S Bi:2:030:2 -115 4 <
ffffffc1a6d20b40 623446897 C Bi:2:030:2 -2 0


here is the output of lsusb -v
______________________________________________________________
Bus 002 Device 030: ID 0403:601f Future Technology Devices International, Ltd
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.10
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 ?
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0         9
  idVendor           0x0403 Future Technology Devices International, Ltd
  idProduct          0x601f
  bcdDevice            0.00
  iManufacturer           1 FTDI
  iProduct                2 FTDI SuperSpeed-FIFO Bridge
  iSerial                 3 000000000001
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           87
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower               24mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         2
      bFunctionClass        255 Vendor Specific Class
      bFunctionSubClass     255 Vendor Specific Subclass
      bFunctionProtocol     255 Vendor Specific Protocol
      iFunction               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               9
        bMaxBurst               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst              15
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst              15
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength           22
  bNumDeviceCaps          2
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000006
      Link Power Management (LPM) Supported
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   2
      Lowest fully-functional device speed is High Speed (480Mbps)
    bU1DevExitLat          10 micro seconds
    bU2DevExitLat        2047 micro seconds
Device Status:     0x000d
  Self Powered
  U1 Enabled
  U2 Enabled




I have tried messing around with bytes to length and buffer size, with the same results.

Thanks for your time.

Eric