topic Re: LPC11U68: USB ISP countinously enumerated by Linux but the mass-storage is never mounted in LPC Microcontrollers

LPC11U68: USB ISP countinously enumerated by Linux but the mass-storage is never mounted

oliviermartin — Wed, 02 Nov 2016 21:40:24 GMT

Hi all,
I have designed my own PCB with LPC11U68. Here is the schematic:

We cannot read well but the capacitors attached to the crystal are 18pF and the crystal is this one: http://www.digikey.com/product-detail/en/7M-12.000MEEQ-T/887-1316-1-ND/2207898

The ISP is expected to be through USB (I cannot change to UART). I have a 12Mhz external crystal.
When I plug the board to USB, I can see the USB be enumerated by Linux:

[46830.963165] scsi79 : usb-storage 2-1.3:1.0
[46831.436294] usb 2-1.3: USB disconnect, device number 68
[46831.634474] usb 2-1.3: new full-speed USB device number 69 using ehci-pci
[46831.729533] usb 2-1.3: New USB device found, idVendor=1fc9, idProduct=0017
[46831.729542] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[46831.729548] usb 2-1.3: Product: LPC1XXX IFLASH
[46831.729553] usb 2-1.3: Manufacturer: NXP
[46831.729557] usb 2-1.3: SerialNumber: ISP
[46831.730339] usb-storage 2-1.3:1.0: USB Mass Storage device detected

But I could only access the USB mass-storage the first time I plugged it. But I did not have time to do anything else, after few seconds the mass-storage disappeared and since then every time I plug the device it constantly enumerated but without mounting the mass-storage; even after leaving the device unplugged for an hour.

The only one time the LPC was successful mounted I had this output:

[234963.388167] usb 1-1.1: new full-speed USB device number 113 using ehci-pci
[234963.483203] usb 1-1.1: New USB device found, idVendor=1fc9, idProduct=0017
[234963.483210] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[234963.483215] usb 1-1.1: Product: LPC1XXX IFLASH
[234963.483218] usb 1-1.1: Manufacturer: NXP
[234963.483222] usb 1-1.1: SerialNumber: ISP
[234963.483994] usb-storage 1-1.1:1.0: USB Mass Storage device detected
[234963.484215] scsi122 : usb-storage 1-1.1:1.0
mtp-probe: checking bus 1, device 113: "/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1"
mtp-probe: bus: 1, device: 113 was not an MTP device
[234964.485934] scsi 122:0:0:0: Direct-Access NXP LPC1XXX IFLASH 1.0 PQ: 0 ANSI: 0 CCS
[234964.486568] sd 122:0:0:0: Attached scsi generic sg2 type 0
[234964.487081] sd 122:0:0:0: [sdb] 516 512-byte logical blocks: (264 kB/258 KiB)
[234964.488418] sd 122:0:0:0: [sdb] Write Protect is off
[234964.488427] sd 122:0:0:0: [sdb] Mode Sense: 03 00 00 00
[234964.492817] sd 122:0:0:0: [sdb] No Caching mode page found
[234964.492827] sd 122:0:0:0: [sdb] Assuming drive cache: write through
[234964.497456] sd 122:0:0:0: [sdb] No Caching mode page found
[234964.497465] sd 122:0:0:0: [sdb] Assuming drive cache: write through
[234964.506426] sdb:
[234964.511600] sd 122:0:0:0: [sdb] No Caching mode page found
[234964.511607] sd 122:0:0:0: [sdb] Assuming drive cache: write through
[234964.511613] sd 122:0:0:0: [sdb] Attached SCSI removable disk
udisksd[2678]: Mounted /dev/sdb at /media/olivier/CRP DISABLD on behalf of uid 1000

I tried on a different computer and it also continuously enumerated without mounting the mass-storage.

I can briefly do a `lsusb` and Linux seems to return the appropriate info:

Device Descriptor:
bLength                18
bDescriptorType         1
bcdUSB               2.00
bDeviceClass            0 (Defined at Interface level)
bDeviceSubClass         0
bDeviceProtocol         0
bMaxPacketSize0        64
idVendor           0x1fc9 NXP Semiconductors
idProduct          0x0017
bcdDevice            d.01
iManufacturer           1
iProduct                2
iSerial                 3
bNumConfigurations      1
Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81 EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040 1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01 EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040 1x 64 bytes
        bInterval               0

I am trying to think about potential issues:
- Software: Unlikely as it is still in the NXP ROM Bootloader
- Design: Possible, I discovered after sending my design to the PCB manufacturer that NXP has added many more capacitors on the voltage lines: https://www.lpcware.com/system/files/LPC11U68_Xpresso_v2_Schematic_RevC_1.pdf .
- Soldering: Why not (I am not necessary an expert in SMD soldering) but it would not explain why it "almost" work

With a logic analyzer, the crystal signals XTALIN and XTALOUT look like that:
I confirm XTALOUT has a frequency of 12MHz.

The USB signals look like that (I removed the crystal signals):

I compare both last packets before the interruption of the USB signals and they are different.

Re: LPC11U68: USB ISP countinously enumerated by Linux but the mass-storage is never mounted

jeremyzhou — Fri, 04 Nov 2016 03:00:44 GMT

Hi Olivier Martin,

I've also use the ISUSB to get the information which is illustrated below.

And I'd highly recommend you to check the hardware circuit of the customize board again.

Bus 003 Device 004: ID 1fc9:0090 NXP Semiconductors 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 ?
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x1fc9 NXP Semiconductors
  idProduct          0x0090 
  bcdDevice            1.00
  iManufacturer           1 
  iProduct                2 
  iSerial                 3 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          139
    bNumInterfaces          4
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              250mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              4 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      33
         Report Descriptors: 
           ** UNAVAILABLE **
      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               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         1
      bInterfaceCount         2
      bFunctionClass          2 Communications
      bFunctionSubClass       2 Abstract (modem)
      bFunctionProtocol       0 None
      iFunction               5 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol      0 None
      iInterface              5 
      CDC Header:
        bcdCDC               1.10
      CDC Call Management:
        bmCapabilities       0x01
          call management
        bDataInterface          2
      CDC ACM:
        bmCapabilities       0x02
          line coding and serial state
      CDC Union:
        bMasterInterface        1
        bSlaveInterface         2 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval               2
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 
      iInterface              5 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              6 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      33
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
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Have a great day,
Ping

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