custom XMOS board not working with AN00129

[Dimitree]

Hello everyone, this is my first project with a XMOS device,
I'm trying to build an open-source XMOS based project (https://github.com/freeDSP/freeDSP-INFINITAS).
The project is a USB audio interface, and contains a XE256-512 for the USB interfacing, along with a FPGA for digital audio routing and an optional DSP chip.
After flashing the project files into the XMOS chip, I couldn't see any new device connected to my computers (both Win and MacOS), so I tried flashing the AN00129:-USB-HID-Class(2_0_2rc1) project to test the PCB. Not even this one worked.
The simple steps I made were this:

1) using xTIMEcomposer I imported the AN00129 project along with the required libs (lib_usb, lib_gpio, lib_xassert, lib_logging).
2) built the project with the "X200" build configuration (the build was successfull with no errors)
3) flashed the XMOS with a XA-XTAG programmer, using this SPI spec file (it was provided by the project, IS25LP080D.spi-spec):

Code: Select all

 10,           /*  flash id = value returned by fl_getFlashType                  */
    256,          /*  page size in bytes                                 */
    4096,         /*  number of pages                                    */
    3,            /*  number of address bytes to send                        */
    3,            /*  divider to generate the SPI clock from the reference clock            */
    0x9F,         /*  command to read the device ID                           */
    0,            /*  number of dummy bytes returned before the ID                  */
    3,            /*  ID size in bytes                                    */
    0x9D6014,     /*  expected device ID                                 */
    0x20,         /*  command to erase all or part of a sector                     */
    4096,         /*  number of bytes erased by sector erase;  0 = entire sector            */
    0x06,         /*  command to write-enable the device                        */
    0x04,         /*  command to write-disable the device                        */
    PROT_TYPE_NONE,   /*  protection type;  PROT_TYPE_NONE = no protection            */
    {{0,0},{0,0}},    /*  description of the device protection                        */
    0x02,         /*  command to program a page                           */
    0xEB,         /*  command to read data                              */
    6,            /*  number of dummy bytes returned before the data               */
    SECTOR_LAYOUT_REGULAR,   /*  sector layout; SECTOR_LAYOUT_REGULAR=all sectors same size   */
    {4096,{0,{0}}},   /*  sector sizes                                       */
    0x05,         	  /*  command to read  the status register                        */
    0x01,         	  /*  command to write the status register                        */
    0x01,         	  /*  bit mask for the Write In Progress bit                        */

4) flashing went ok ("Site 0 has finished successfully. "), but as I said, connecting the board to the USB port, nothing happens.

this is the schematic of the XMOS portion of the board. I verified the voltages and connections, and everything looks fine.

xmosusb.png

Do you have any idea what could be wrong?
Thank you

[mmar]

Maybe you skip important point. Between 1 and 2 is required configure xn file in project for your board schematics.

[RitchRock]

Have you verified the power supply sequencing and clock frequencies are correct? I don't see the full circuit in the image you sent. Would be useful to see your full power supply and clocking circuit with the CS2100. After that you might verify the connections from your diagram reflect the same pins as your code.

[Dimitree]

Maybe you skip important point. Between 1 and 2 is required configure xn file in project for your board schematics.

Didn't know about that, sorry, I'm reading the AN00129 app notes to try to understand what I am missing

Have you verified the power supply sequencing and clock frequencies are correct? I don't see the full circuit in the image you sent. Would be useful to see your full power supply and clocking circuit with the CS2100. After that you might verify the connections from your diagram reflect the same pins as your code.

sorry, I thought that the schematic I posted was the entire circuit surrounding the XMOS, this is the full schematic of the project

infinitas.pdf

[RitchRock]

Have you checked the power supply sequencing and your clocks are behaving as expected when connecting to USB? Start with page 23 (section 13) for power supply sequencing and verify your timing looks acceptable. Go ahead and post screen shots from your scope if you can: https://www.xmos.ai/file/xe216-512-tq12 ... ion=latest

I also notice the C207 is 100nF when the USB spec calls for 1-10uF. See page 20 and figure 15 in the datasheet above.

[Dimitree]

Have you checked the power supply sequencing and your clocks are behaving as expected when connecting to USB? Start with page 23 (section 13) for power supply sequencing and verify your timing looks acceptable. Go ahead and post screen shots from your scope if you can: https://www.xmos.ai/file/xe216-512-tq12 ... ion=latest

I also notice the C207 is 100nF when the USB spec calls for 1-10uF. See page 20 and figure 15 in the datasheet above.

thanks for the help..I replaced C207 with 10uF and it didn't fix the issue, but then I tried to check the power supply sequencing and noticed that the reset pin on the XMOS was always low..so I traced the signal backwards and found out that the issue was around the buffer IC204, replaced that IC and everything is working fine now.

thanks!